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* Disable single thread optimization for open_memstreamSzabolcs Nagy2017-07-141-1/+1
| | | | | | | | | | | | | Single thread optimization is valid if at thread creation time the optimization can be disabled. This is in principle true for all stream objects that user code can access (and thus needs locking), using the same internal list as fflush(0) uses. However in glibc open_memstream is not on that list (BZ 21735) so the optimization has to be disabled. * libio/memstream.c (__open_memstream): Set _IO_FLAGS2_NEED_LOCK. * libio/wmemstream.c (open_wmemstream): Likewise. * nptl/tst-memstream.c: New.
* Move tst-mutex*8* to tests-internalTulio Magno Quites Machado Filho2017-05-251-4/+5
| | | | | | | | | | | | | | The following tests depend on ENABLE_LOCK_ELISION, which is only available on tests-internal. - nptl/tst-mutex8 - nptl/tst-mutex8-static - nptl/tst-mutexpi8 - nptl/tst-mutexpi8-static * nptl/Makefile (tests): Move nptl/tst-mutex8, nptl/tst-mutex8-static, nptl/tst-mutexpi8 and nptl/tst-mutexpi8-static to... (tests-internal): ... here.
* posix: Consolidate Linux fsync syscallAdhemerval Zanella2017-05-181-0/+1
| | | | | | | | | | | | | | | | | | | | | | | This patch consolidates the fsync Linux syscall generation on sysdeps/unix/sysv/linux/fsync.c. It basically removes it from architectures auto-generation list. For arm it also removes the __errno_location call since fsync is not called with SYSCALL_CANCEL with call arch-specific INLINE_SYSCALL macro which in turn will call __set_errno macro (and setting errno directly). Checked on i686-linux-gnu, x86_64-linux-gnu, x86_64-linux-gnux32, arch64-linux-gnu, arm-linux-gnueabihf, powerpc64le-linux-gnu, sparc64-linux-gnu, and sparcv9-linux-gnu. * misc/Makefile (CFLAGS-fsync.c): New flag. * nptl/Makefile (CFLAGS-fsync.c): Likewise. * sysdeps/unix/syscalls.list (fsync): Remove from auto-generation syscall list. * sysdeps/unix/sysv/linux/fsync.c: New file. * sysdeps/unix/sysv/linux/arm/localplt.data [libpthread.so] (__errno_location): Remove.
* posix: Consolidate Linux fdatasync syscallAdhemerval Zanella2017-05-181-0/+1
| | | | | | | | | | | | | | | | This patch consolidates the fdatasync Linux syscall generation on sysdeps/unix/sysv/linux/fdatasync.c. It basically removes it from architectures auto-generation list. Checked on i686-linux-gnu, x86_64-linux-gnu, x86_64-linux-gnux32, arch64-linux-gnu, arm-linux-gnueabihf, powerpc64le-linux-gnu, sparc64-linux-gnu, and sparcv9-linux-gnu. * misc/makefile (CFLAGS-datasync.c): New flag. * nptl/makefile (CFLAGS-datasync.c): Likewise. * sysdeps/unix/sysv/linux/syscalls.list (fdatasync): Remove from auto-generation syscall list. * sysdeps/unix/sysv/linux/fdatasync.c: New file.
* posix: Consolidate Linux msync syscallAdhemerval Zanella2017-05-181-0/+1
| | | | | | | | | | | | | | | This patch consolidates the msync Linux syscall generation on sysdeps/unix/sysv/linux/msync.c. It basically removes it from architectures auto-generation list. Checked on i686-linux-gnu, x86_64-linux-gnu, x86_64-linux-gnux32, arch64-linux-gnu, arm-linux-gnueabihf, powerpc64le-linux-gnu, sparc64-linux-gnu, and sparcv9-linux-gnu. * misc/Makefile (CFLAGS-msync.c): New rule. * nptl/Makefile (CFLAGS-msync.c): Likewise. * sysdeps/unix/syscalls.list: Remove msync from auto-generation list. * sysdeps/unix/sysv/linux/msync.c: New file.
* posix: Consolidate Linux sigsuspend implementationAdhemerval Zanella2017-05-181-0/+1
| | | | | | | | | | | | | | | | | | | | This patch consolidates the sigsuspend Linux syscall generation on sysdeps/unix/sysv/linux/sigsuspend.c. It basically removes the alpha assembly version which call the old sigsusped interface using only the first doubleword from sigset. Current minimum supported kernel on alpha (3.2) enforces rt_sigsuspend on the architecture (__ARCH_WANT_SYS_RT_SIGSUSPEND option on kernel), so it is possible to use the default implementation. Checked on i686-linux-gnu, x86_64-linux-gnu, x86_64-linux-gnux32, arch64-linux-gnu, arm-linux-gnueabihf, powerpc64le-linux-gnu, sparc64-linux-gnu, and sparcv9-linux-gnu. * sysdeps/unix/sysv/linux/alpha/sigsuspend.S: Remove file. * sysdeps/unix/sysv/linux/sigsuspend.c: Simplify include list. * nptl/Makefile (CFLAGS-sigsuspend.c): New rule. * sysdeps/unix/sysv/linux/sparc/sparc64/Makefile (CFLAGS-sigsuspend.c): Remove rule.
* posix: Consolidate Linux nanosleep syscallAdhemerval Zanella2017-05-181-0/+1
| | | | | | | | | | | | | | | | This patch consolidates the nanosleep Linux syscall generation on sysdeps/unix/sysv/linux/nanosleep.c. It basically removes it from architectures auto-generation list. Checked on i686-linux-gnu, x86_64-linux-gnu, x86_64-linux-gnux32, arch64-linux-gnu, arm-linux-gnueabihf, powerpc64le-linux-gnu, sparc64-linux-gnu, and sparcv9-linux-gnu. * nptl/Makefile (CFLAGS-nanosleep.c): New rule. * posix/Makefile (CFLAGS-nanosleep.c): Likewise. * sysdeps/unix/sysv/linux/nanosleep.c: New file. * sysdeps/unix/sysv/linux/syscalls.list: Remove nanosleep from auto-generated list.
* Suppress internal declarations for most of the testsuite.Zack Weinberg2017-05-111-14/+17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds a new build module called 'testsuite'. IS_IN (testsuite) implies _ISOMAC, as do IS_IN_build and __cplusplus (which means several ad-hoc tests for __cplusplus can go away). libc-symbols.h now suppresses almost all of *itself* when _ISOMAC is defined; in particular, _ISOMAC mode does not get config.h automatically anymore. There are still quite a few tests that need to see internal gunk of one variety or another. For them, we now have 'tests-internal' and 'test-internal-extras'; files in this category will still be compiled with MODULE_NAME=nonlib, and everything proceeds as it always has. The bulk of this patch is moving tests from 'tests' to 'tests-internal'. There is also 'tests-static-internal', which has the same effect on files in 'tests-static', and 'modules-names-tests', which has the *inverse* effect on files in 'modules-names' (it's inverted because most of the things in modules-names are *not* tests). For both of these, the file must appear in *both* the new variable and the old one. There is also now a special case for when libc-symbols.h is included without MODULE_NAME being defined at all. (This happens during the creation of libc-modules.h, and also when preprocessing Versions files.) When this happens, IS_IN is set to be always false and _ISOMAC is *not* defined, which was the status quo, but now it's explicit. The remaining changes to C source files in this patch seemed likely to cause problems in the absence of the main change. They should be relatively self-explanatory. In a few cases I duplicated a definition from an internal header rather than move the test to tests-internal; this was a judgement call each time and I'm happy to change those however reviewers feel is more appropriate. * Makerules: New subdir configuration variables 'tests-internal' and 'test-internal-extras'. Test files in these categories will still be compiled with MODULE_NAME=nonlib. Test files in the existing categories (tests, xtests, test-srcs, test-extras) are now compiled with MODULE_NAME=testsuite. New subdir configuration variable 'modules-names-tests'. Files which are in both 'modules-names' and 'modules-names-tests' will be compiled with MODULE_NAME=testsuite instead of MODULE_NAME=extramodules. (gen-as-const-headers): Move to tests-internal. (do-tests-clean, common-mostlyclean): Support tests-internal. * Makeconfig (built-modules): Add testsuite. * Makefile: Change libof-check-installed-headers-c and libof-check-installed-headers-cxx to 'testsuite'. * Rules: Likewise. Support tests-internal. * benchtests/strcoll-inputs/filelist#en_US.UTF-8: Remove extra-modules.mk. * config.h.in: Don't check for __OPTIMIZE__ or __FAST_MATH__ here. * include/libc-symbols.h: Move definitions of _GNU_SOURCE, PASTE_NAME, PASTE_NAME1, IN_MODULE, IS_IN, and IS_IN_LIB to the very top of the file and rationalize their order. If MODULE_NAME is not defined at all, define IS_IN to always be false, and don't define _ISOMAC. If any of IS_IN (testsuite), IS_IN_build, or __cplusplus are true, define _ISOMAC and suppress everything else in this file, starting with the inclusion of config.h. Do check for inappropriate definitions of __OPTIMIZE__ and __FAST_MATH__ here, but only if _ISOMAC is not defined. Correct some out-of-date commentary. * include/math.h: If _ISOMAC is defined, undefine NO_LONG_DOUBLE and _Mlong_double_ before including math.h. * include/string.h: If _ISOMAC is defined, don't expose _STRING_ARCH_unaligned. Move a comment to a more appropriate location. * include/errno.h, include/stdio.h, include/stdlib.h, include/string.h * include/time.h, include/unistd.h, include/wchar.h: No need to check __cplusplus nor use __BEGIN_DECLS/__END_DECLS. * misc/sys/cdefs.h (__NTHNL): New macro. * sysdeps/m68k/m680x0/fpu/bits/mathinline.h (__m81_defun): Use __NTHNL to avoid errors with GCC 6. * elf/tst-env-setuid-tunables.c: Include config.h with _LIBC defined, for HAVE_TUNABLES. * inet/tst-checks-posix.c: No need to define _ISOMAC. * intl/tst-gettext2.c: Provide own definition of N_. * math/test-signgam-finite-c99.c: No need to define _ISOMAC. * math/test-signgam-main.c: No need to define _ISOMAC. * stdlib/tst-strtod.c: Convert to test-driver. Split locale_test to... * stdlib/tst-strtod1i.c: ...this new file. * stdlib/tst-strtod5.c: Convert to test-driver and add copyright notice. Split tests of __strtod_internal to... * stdlib/tst-strtod5i.c: ...this new file. * string/test-string.h: Include stdint.h. Duplicate definition of inhibit_loop_to_libcall here (from libc-symbols.h). * string/test-strstr.c: Provide dummy definition of libc_hidden_builtin_def when including strstr.c. * sysdeps/ia64/fpu/libm-symbols.h: Suppress entire file in _ISOMAC mode; no need to test __STRICT_ANSI__ nor __cplusplus as well. * sysdeps/x86_64/fpu/math-tests-arch.h: Include cpu-features.h. Don't include init-arch.h. * sysdeps/x86_64/multiarch/test-multiarch.h: Include cpu-features.h. Don't include init-arch.h. * elf/Makefile: Move tst-ptrguard1-static, tst-stackguard1-static, tst-tls1-static, tst-tls2-static, tst-tls3-static, loadtest, unload, unload2, circleload1, neededtest, neededtest2, neededtest3, neededtest4, tst-tls1, tst-tls2, tst-tls3, tst-tls6, tst-tls7, tst-tls8, tst-dlmopen2, tst-ptrguard1, tst-stackguard1, tst-_dl_addr_inside_object, and all of the ifunc tests to tests-internal. Don't add $(modules-names) to test-extras. * inet/Makefile: Move tst-inet6_scopeid_pton to tests-internal. Add tst-deadline to tests-static-internal. * malloc/Makefile: Move tst-mallocstate and tst-scratch_buffer to tests-internal. * misc/Makefile: Move tst-atomic and tst-atomic-long to tests-internal. * nptl/Makefile: Move tst-typesizes, tst-rwlock19, tst-sem11, tst-sem12, tst-sem13, tst-barrier5, tst-signal7, tst-tls3, tst-tls3-malloc, tst-tls5, tst-stackguard1, tst-sem11-static, tst-sem12-static, and tst-stackguard1-static to tests-internal. Link tests-internal with libpthread also. Don't add $(modules-names) to test-extras. * nss/Makefile: Move tst-field to tests-internal. * posix/Makefile: Move bug-regex5, bug-regex20, bug-regex33, tst-rfc3484, tst-rfc3484-2, and tst-rfc3484-3 to tests-internal. * stdlib/Makefile: Move tst-strtod1i, tst-strtod3, tst-strtod4, tst-strtod5i, tst-tls-atexit, and tst-tls-atexit-nodelete to tests-internal. * sunrpc/Makefile: Move tst-svc_register to tests-internal. * sysdeps/powerpc/Makefile: Move test-get_hwcap and test-get_hwcap-static to tests-internal. * sysdeps/unix/sysv/linux/Makefile: Move tst-setgetname to tests-internal. * sysdeps/x86_64/fpu/Makefile: Add all libmvec test modules to modules-names-tests.
* Consolidate Linux write syscallAdhemerval Zanella2017-05-111-0/+1
| | | | | | | | | | | | | This patch consolidates the write Linux syscall implementation on sysdeps/unix/sysv/linux/write.c. Checked on i686-linux-gnu, x86_64-linux-gnu, x86_64-linux-gnux32, arch64-linux-gnu, arm-linux-gnueabihf, and powerpc64le-linux-gnu. * include/unistd.h (write): Add hidden proto. * io/Makefile (CFLAGS-write.c): New rule. * nptl/Makefile (CFLAGS-write.c): Likewise. * sysdeps/unix/sysv/linux/write.c: New file.
* Consolidate Linux read syscallAdhemerval Zanella2017-05-111-0/+1
| | | | | | | | | | | | | | | | | | | | | | | This patch consolidates the read Linux syscall implementation on sysdeps/unix/sysv/linux/read.c. This leads to a different frame pointer creation on some architectures: * It fixes BZ#21428 on aarch64, since now the returned address for the read syscall can be correctly found out by backtrace_symbols. * It makes tst-backtrace{5,6} fails on powerpc due an issue on its custom backtrace implementation. It is fixed on subsequent patch from this set. Checked on i686-linux-gnu, x86_64-linux-gnu, x86_64-linux-gnux32, arch64-linux-gnu, arm-linux-gnueabihf, and powerpc64le-linux-gnu. [BZ #21428] * include/unistd.h (read): Add hidden proto. * io/Makefile (CFLAGS-read.c): New rule. * nptl/Makefile (CFLAGS-read.c): New rule. * sysdeps/unix/sysv/linux/read.c: New file.
* Consolidate Linux close syscall generationAdhemerval Zanella2017-05-111-0/+1
| | | | | | | | | | | This patch consolidates the close Linux syscall generation on sysdeps/unix/sysv/linux/close.c. Checked on i686-linux-gnu, x86_64-linux-gnu, x86_64-linux-gnux32, arch64-linux-gnu, arm-linux-gnueabihf, and powerpc64le-linux-gnu. * nptl/Makefile (CFLAGS-close.c): New flag. * sysdeps/unix/sysv/linux/close.c: New file.
* Bug 20116: Fix use after free in pthread_create()Carlos O'Donell2017-01-281-1/+1
| | | | | | | | | | | | | | | | | | The commit documents the ownership rules around 'struct pthread' and when a thread can read or write to the descriptor. With those ownership rules in place it becomes obvious that pd->stopped_start should not be touched in several of the paths during thread startup, particularly so for detached threads. In the case of detached threads, between the time the thread is created by the OS kernel and the creating thread checks pd->stopped_start, the detached thread might have already exited and the memory for pd unmapped. As a regression test we add a simple test which exercises this exact case by quickly creating detached threads with large enough stacks to ensure the thread stack cache is bypassed and the stacks are unmapped. Before the fix the testcase segfaults, after the fix it works correctly and completes without issue. For a detailed discussion see: https://www.sourceware.org/ml/libc-alpha/2017-01/msg00505.html
* nptl: Add tst-robust-forkFlorian Weimer2017-01-271-1/+2
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* robust mutexes: Fix broken x86 assembly by removing itTorvald Riegel2017-01-131-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | lll_robust_unlock on i386 and x86_64 first sets the futex word to FUTEX_WAITERS|0 before calling __lll_unlock_wake, which will set the futex word to 0. If the thread is killed between these steps, then the futex word will be FUTEX_WAITERS|0, and the kernel (at least current upstream) will not set it to FUTEX_OWNER_DIED|FUTEX_WAITERS because 0 is not equal to the TID of the crashed thread. The lll_robust_lock assembly code on i386 and x86_64 is not prepared to deal with this case because the fastpath tries to only CAS 0 to TID and not FUTEX_WAITERS|0 to TID; the slowpath simply waits until it can CAS 0 to TID or the futex_word has the FUTEX_OWNER_DIED bit set. This issue is fixed by removing the custom x86 assembly code and using the generic C code instead. However, instead of adding more duplicate code to the custom x86 lowlevellock.h, the code of the lll_robust* functions is inlined into the single call sites that exist for each of these functions in the pthread_mutex_* functions. The robust mutex paths in the latter have been slightly reorganized to make them simpler. This patch is meant to be easy to backport, so C11-style atomics are not used. [BZ #20985] * nptl/Makefile: Adapt. * nptl/pthread_mutex_cond_lock.c (LLL_ROBUST_MUTEX_LOCK): Remove. (LLL_ROBUST_MUTEX_LOCK_MODIFIER): New. * nptl/pthread_mutex_lock.c (LLL_ROBUST_MUTEX_LOCK): Remove. (LLL_ROBUST_MUTEX_LOCK_MODIFIER): New. (__pthread_mutex_lock_full): Inline lll_robust* functions and adapt. * nptl/pthread_mutex_timedlock.c (pthread_mutex_timedlock): Inline lll_robust* functions and adapt. * nptl/pthread_mutex_unlock.c (__pthread_mutex_unlock_full): Likewise. * sysdeps/nptl/lowlevellock.h (__lll_robust_lock_wait, __lll_robust_lock, lll_robust_cond_lock, __lll_robust_timedlock_wait, __lll_robust_timedlock, __lll_robust_unlock): Remove. * sysdeps/unix/sysv/linux/i386/lowlevellock.h (lll_robust_lock, lll_robust_cond_lock, lll_robust_timedlock, lll_robust_unlock): Remove. * sysdeps/unix/sysv/linux/x86_64/lowlevellock.h (lll_robust_lock, lll_robust_cond_lock, lll_robust_timedlock, lll_robust_unlock): Remove. * sysdeps/unix/sysv/linux/sparc/lowlevellock.h (__lll_robust_lock_wait, __lll_robust_lock, lll_robust_cond_lock, __lll_robust_timedlock_wait, __lll_robust_timedlock, __lll_robust_unlock): Remove. * nptl/lowlevelrobustlock.c: Remove file. * nptl/lowlevelrobustlock.sym: Likewise. * sysdeps/unix/sysv/linux/i386/lowlevelrobustlock.S: Likewise. * sysdeps/unix/sysv/linux/x86_64/lowlevelrobustlock.S: Likewise.
* New pthread rwlock that is more scalable.Torvald Riegel2017-01-101-5/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This replaces the pthread rwlock with a new implementation that uses a more scalable algorithm (primarily through not using a critical section anymore to make state changes). The fast path for rdlock acquisition and release is now basically a single atomic read-modify write or CAS and a few branches. See nptl/pthread_rwlock_common.c for details. * nptl/DESIGN-rwlock.txt: Remove. * nptl/lowlevelrwlock.sym: Remove. * nptl/Makefile: Add new tests. * nptl/pthread_rwlock_common.c: New file. Contains the new rwlock. * nptl/pthreadP.h (PTHREAD_RWLOCK_PREFER_READER_P): Remove. (PTHREAD_RWLOCK_WRPHASE, PTHREAD_RWLOCK_WRLOCKED, PTHREAD_RWLOCK_RWAITING, PTHREAD_RWLOCK_READER_SHIFT, PTHREAD_RWLOCK_READER_OVERFLOW, PTHREAD_RWLOCK_WRHANDOVER, PTHREAD_RWLOCK_FUTEX_USED): New. * nptl/pthread_rwlock_init.c (__pthread_rwlock_init): Adapt to new implementation. * nptl/pthread_rwlock_rdlock.c (__pthread_rwlock_rdlock_slow): Remove. (__pthread_rwlock_rdlock): Adapt. * nptl/pthread_rwlock_timedrdlock.c (pthread_rwlock_timedrdlock): Adapt. * nptl/pthread_rwlock_timedwrlock.c (pthread_rwlock_timedwrlock): Adapt. * nptl/pthread_rwlock_trywrlock.c (pthread_rwlock_trywrlock): Adapt. * nptl/pthread_rwlock_tryrdlock.c (pthread_rwlock_tryrdlock): Adapt. * nptl/pthread_rwlock_unlock.c (pthread_rwlock_unlock): Adapt. * nptl/pthread_rwlock_wrlock.c (__pthread_rwlock_wrlock_slow): Remove. (__pthread_rwlock_wrlock): Adapt. * nptl/tst-rwlock10.c: Adapt. * nptl/tst-rwlock11.c: Adapt. * nptl/tst-rwlock17.c: New file. * nptl/tst-rwlock18.c: New file. * nptl/tst-rwlock19.c: New file. * nptl/tst-rwlock2b.c: New file. * nptl/tst-rwlock8.c: Adapt. * nptl/tst-rwlock9.c: Adapt. * sysdeps/aarch64/nptl/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * sysdeps/arm/nptl/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * sysdeps/hppa/nptl/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * sysdeps/ia64/nptl/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * sysdeps/m68k/nptl/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * sysdeps/microblaze/nptl/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * sysdeps/mips/nptl/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * sysdeps/nios2/nptl/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * sysdeps/s390/nptl/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * sysdeps/sh/nptl/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * sysdeps/sparc/nptl/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * sysdeps/tile/nptl/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * sysdeps/unix/sysv/linux/alpha/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * sysdeps/unix/sysv/linux/powerpc/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * sysdeps/x86/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * nptl/nptl-printers.py (): Adapt. * nptl/nptl_lock_constants.pysym: Adapt. * nptl/test-rwlock-printers.py: Adapt. * nptl/test-rwlockattr-printers.c: Adapt. * nptl/test-rwlockattr-printers.py: Adapt.
* Update copyright dates with scripts/update-copyrights.Joseph Myers2017-01-011-1/+1
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* New condvar implementation that provides stronger ordering guarantees.Torvald Riegel2016-12-311-4/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This is a new implementation for condition variables, required after http://austingroupbugs.net/view.php?id=609 to fix bug 13165. In essence, we need to be stricter in which waiters a signal or broadcast is required to wake up; this couldn't be solved using the old algorithm. ISO C++ made a similar clarification, so this also fixes a bug in current libstdc++, for example. We can't use the old algorithm anymore because futexes do not guarantee to wake in FIFO order. Thus, when we wake, we can't simply let any waiter grab a signal, but we need to ensure that one of the waiters happening before the signal is woken up. This is something the previous algorithm violated (see bug 13165). There's another issue specific to condvars: ABA issues on the underlying futexes. Unlike mutexes that have just three states, or semaphores that have no tokens or a limited number of them, the state of a condvar is the *order* of the waiters. A waiter on a semaphore can grab a token whenever one is available; a condvar waiter must only consume a signal if it is eligible to do so as determined by the relative order of the waiter and the signal. Therefore, this new algorithm maintains two groups of waiters: Those eligible to consume signals (G1), and those that have to wait until previous waiters have consumed signals (G2). Once G1 is empty, G2 becomes the new G1. 64b counters are used to avoid ABA issues. This condvar doesn't yet use a requeue optimization (ie, on a broadcast, waking just one thread and requeueing all others on the futex of the mutex supplied by the program). I don't think doing the requeue is necessarily the right approach (but I haven't done real measurements yet): * If a program expects to wake many threads at the same time and make that scalable, a condvar isn't great anyway because of how it requires waiters to operate mutually exclusive (due to the mutex usage). Thus, a thundering herd problem is a scalability problem with or without the optimization. Using something like a semaphore might be more appropriate in such a case. * The scalability problem is actually at the mutex side; the condvar could help (and it tries to with the requeue optimization), but it should be the mutex who decides how that is done, and whether it is done at all. * Forcing all but one waiter into the kernel-side wait queue of the mutex prevents/avoids the use of lock elision on the mutex. Thus, it prevents the only cure against the underlying scalability problem inherent to condvars. * If condvars use short critical sections (ie, hold the mutex just to check a binary flag or such), which they should do ideally, then forcing all those waiter to proceed serially with kernel-based hand-off (ie, futex ops in the mutex' contended state, via the futex wait queues) will be less efficient than just letting a scalable mutex implementation take care of it. Our current mutex impl doesn't employ spinning at all, but if critical sections are short, spinning can be much better. * Doing the requeue stuff requires all waiters to always drive the mutex into the contended state. This leads to each waiter having to call futex_wake after lock release, even if this wouldn't be necessary. [BZ #13165] * nptl/pthread_cond_broadcast.c (__pthread_cond_broadcast): Rewrite to use new algorithm. * nptl/pthread_cond_destroy.c (__pthread_cond_destroy): Likewise. * nptl/pthread_cond_init.c (__pthread_cond_init): Likewise. * nptl/pthread_cond_signal.c (__pthread_cond_signal): Likewise. * nptl/pthread_cond_wait.c (__pthread_cond_wait): Likewise. (__pthread_cond_timedwait): Move here from pthread_cond_timedwait.c. (__condvar_confirm_wakeup, __condvar_cancel_waiting, __condvar_cleanup_waiting, __condvar_dec_grefs, __pthread_cond_wait_common): New. (__condvar_cleanup): Remove. * npt/pthread_condattr_getclock.c (pthread_condattr_getclock): Adapt. * npt/pthread_condattr_setclock.c (pthread_condattr_setclock): Likewise. * npt/pthread_condattr_getpshared.c (pthread_condattr_getpshared): Likewise. * npt/pthread_condattr_init.c (pthread_condattr_init): Likewise. * nptl/tst-cond1.c: Add comment. * nptl/tst-cond20.c (do_test): Adapt. * nptl/tst-cond22.c (do_test): Likewise. * sysdeps/aarch64/nptl/bits/pthreadtypes.h (pthread_cond_t): Adapt structure. * sysdeps/arm/nptl/bits/pthreadtypes.h (pthread_cond_t): Likewise. * sysdeps/ia64/nptl/bits/pthreadtypes.h (pthread_cond_t): Likewise. * sysdeps/m68k/nptl/bits/pthreadtypes.h (pthread_cond_t): Likewise. * sysdeps/microblaze/nptl/bits/pthreadtypes.h (pthread_cond_t): Likewise. * sysdeps/mips/nptl/bits/pthreadtypes.h (pthread_cond_t): Likewise. * sysdeps/nios2/nptl/bits/pthreadtypes.h (pthread_cond_t): Likewise. * sysdeps/s390/nptl/bits/pthreadtypes.h (pthread_cond_t): Likewise. * sysdeps/sh/nptl/bits/pthreadtypes.h (pthread_cond_t): Likewise. * sysdeps/tile/nptl/bits/pthreadtypes.h (pthread_cond_t): Likewise. * sysdeps/unix/sysv/linux/alpha/bits/pthreadtypes.h (pthread_cond_t): Likewise. * sysdeps/unix/sysv/linux/powerpc/bits/pthreadtypes.h (pthread_cond_t): Likewise. * sysdeps/x86/bits/pthreadtypes.h (pthread_cond_t): Likewise. * sysdeps/nptl/internaltypes.h (COND_NWAITERS_SHIFT): Remove. (COND_CLOCK_BITS): Adapt. * sysdeps/nptl/pthread.h (PTHREAD_COND_INITIALIZER): Adapt. * nptl/pthreadP.h (__PTHREAD_COND_CLOCK_MONOTONIC_MASK, __PTHREAD_COND_SHARED_MASK): New. * nptl/nptl-printers.py (CLOCK_IDS): Remove. (ConditionVariablePrinter, ConditionVariableAttributesPrinter): Adapt. * nptl/nptl_lock_constants.pysym: Adapt. * nptl/test-cond-printers.py: Adapt. * sysdeps/unix/sysv/linux/hppa/internaltypes.h (cond_compat_clear, cond_compat_check_and_clear): Adapt. * sysdeps/unix/sysv/linux/hppa/pthread_cond_timedwait.c: Remove file ... * sysdeps/unix/sysv/linux/hppa/pthread_cond_wait.c (__pthread_cond_timedwait): ... and move here. * nptl/DESIGN-condvar.txt: Remove file. * nptl/lowlevelcond.sym: Likewise. * nptl/pthread_cond_timedwait.c: Likewise. * sysdeps/unix/sysv/linux/i386/i486/pthread_cond_broadcast.S: Likewise. * sysdeps/unix/sysv/linux/i386/i486/pthread_cond_signal.S: Likewise. * sysdeps/unix/sysv/linux/i386/i486/pthread_cond_timedwait.S: Likewise. * sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.S: Likewise. * sysdeps/unix/sysv/linux/i386/i586/pthread_cond_broadcast.S: Likewise. * sysdeps/unix/sysv/linux/i386/i586/pthread_cond_signal.S: Likewise. * sysdeps/unix/sysv/linux/i386/i586/pthread_cond_timedwait.S: Likewise. * sysdeps/unix/sysv/linux/i386/i586/pthread_cond_wait.S: Likewise. * sysdeps/unix/sysv/linux/i386/i686/pthread_cond_broadcast.S: Likewise. * sysdeps/unix/sysv/linux/i386/i686/pthread_cond_signal.S: Likewise. * sysdeps/unix/sysv/linux/i386/i686/pthread_cond_timedwait.S: Likewise. * sysdeps/unix/sysv/linux/i386/i686/pthread_cond_wait.S: Likewise. * sysdeps/unix/sysv/linux/x86_64/pthread_cond_broadcast.S: Likewise. * sysdeps/unix/sysv/linux/x86_64/pthread_cond_signal.S: Likewise. * sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S: Likewise. * sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S: Likewise.
* Fix failing pretty printer tests when CPPFLAGS has optimizations.Carlos O'Donell2016-12-231-0/+10
| | | | | | | | The value of CPPFLAGS provided by the environment may have optimizations that interfere with the pretty printer test requirements. To override such optimizations the pretty printer tests must also specify CPPFLAGS. The existing pretty printer tests are fixed and the README.pretty-printers is updated with the new requirement.
* Add pretty printers for the NPTL lock typesMartin Galvan2016-12-081-0/+18
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds pretty printers for the following NPTL types: - pthread_mutex_t - pthread_mutexattr_t - pthread_cond_t - pthread_condattr_t - pthread_rwlock_t - pthread_rwlockattr_t To load the pretty printers into your gdb session, do the following: python import sys sys.path.insert(0, '/path/to/glibc/build/nptl/pretty-printers') end source /path/to/glibc/source/pretty-printers/nptl-printers.py You can check which printers are registered and enabled by issuing the 'info pretty-printer' gdb command. Printers should trigger automatically when trying to print a variable of one of the types mentioned above. The printers are architecture-independent, and were tested on an AMD64 running Ubuntu 14.04 and an x86 VM running Fedora 24. In order to work, the printers need to know the values of various flags that are scattered throughout pthread.h and pthreadP.h as enums and #defines. Since replicating these constants in the printers file itself would create a maintenance burden, I wrote a script called gen-py-const.awk that Makerules uses to extract the constants. This script is pretty much the same as gen-as-const.awk, except it doesn't cast the constant values to 'long' and is thorougly documented. The constants need only to be enumerated in a .pysym file, which is then referenced by a Make variable called gen-py-const-headers. As for the install directory, I discussed this with Mike Frysinger and Siddhesh Poyarekar, and we agreed that it can be handled in a separate patch, and shouldn't block merging of this one. In addition, I've written a series of test cases for the pretty printers. Each lock type (mutex, condvar and rwlock) has two test programs, one for itself and other for its related 'attributes' object. Each test program in turn has a PExpect-based Python script that drives gdb and compares its output to the expected printer's. The tests run on the glibc host, which is assumed to have both gdb and PExpect; if either is absent the tests will fail with code 77 (UNSUPPORTED). For cross-testing you should use cross-test-ssh.sh as test-wrapper. I've tested the printers on both native builds and a cross build using a Beaglebone Black running Debian, with the build system's filesystem shared with the board through NFS. Finally, I've written a README that explains all this and more. * INSTALL: Regenerated. * Makeconfig: Add comments and whitespace to make the control flow clearer. (+link-printers-tests, +link-pie-printers-tests, CFLAGS-printers-tests, installed-rtld-LDFLAGS, built-rtld-LDFLAGS, link-libc-rpath, link-libc-tests-after-rpath-link, link-libc-printers-tests): New. (rtld-LDFLAGS, rtld-tests-LDFLAGS, link-libc-tests-rpath-link, link-libc-tests): Use the new variables as required. * Makerules ($(py-const)): New rule. generated: Add $(py-const). * README.pretty-printers: New file. * Rules (tests-printers-programs, tests-printers-out, py-env): New. (others): Depend on $(py-const). (tests): Depend on $(tests-printers-programs) or $(tests-printers-out), as required. Pass $(tests-printers) to merge-test-results.sh. * manual/install.texi: Add requirements for testing the pretty printers. * nptl/Makefile (gen-py-const-headers, pretty-printers, tests-printers, CFLAGS-test-mutexattr-printers.c CFLAGS-test-mutex-printers.c, CFLAGS-test-condattr-printers.c, CFLAGS-test-cond-printers.c, CFLAGS-test-rwlockattr-printers.c CFLAGS-test-rwlock-printers.c, tests-printers-libs): Define. * nptl/nptl-printers.py: New file. * nptl/nptl_lock_constants.pysym: Likewise. * nptl/test-cond-printers.c: Likewise. * nptl/test-cond-printers.py: Likewise. * nptl/test-condattr-printers.c: Likewise. * nptl/test-condattr-printers.py: Likewise. * nptl/test-mutex-printers.c: Likewise. * nptl/test-mutex-printers.py: Likewise. * nptl/test-mutexattr-printers.c: Likewise. * nptl/test-mutexattr-printers.py: Likewise. * nptl/test-rwlock-printers.c: Likewise. * nptl/test-rwlock-printers.py: Likewise. * nptl/test-rwlockattr-printers.c: Likewise. * nptl/test-rwlockattr-printers.py: Likewise. * scripts/gen-py-const.awk: Likewise. * scripts/test_printers_common.py: Likewise. * scripts/test_printers_exceptions.py: Likewise.
* Consolidate lseek/lseek64/llseek implementationsAdhemerval Zanella2016-11-081-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch consolidates all Linux lseek/lseek64/llseek implementation in on on sysdeps/unix/sysv/linux/lseek{64}.c. It also removes the llseek file and instead consolidate the LFS lseek implementation on lseek64.c as for other LFS symbols implementations. The general idea is: - lseek: ABIs that not define __OFF_T_MATCHES_OFF64_T will preferable use __NR__llseek if kernel supports it, otherwise they will use __NR_lseek. ABIs that defines __OFF_T_MATCHES_OFF64_T won't produce any symbol. - lseek64: ABIs with __OFF_T_MATCHES_OFF64_T will preferable use __NR_lseek (since it will use 64-bit arguments without low/high splitting) and __NR__llseek if __NR_lseek is not defined (for some ILP32 ports). - llseek: files will be removed and symbols will be aliased ot lseek64. ABI without __OFF_T_MATCHES_OFF64_T and without __NR_llseek (basically MIPS64n32 so far) are covered by building lseek with off_t as expected and lseek64 using __NR_lseek (as expected for off64_t being passed using 64-bit registers). For this consolidation I mantained the x32 assembly specific implementation because to correctly fix this it would required both the x32 fix for {INLINE,INTERNAL}_SYSCALL [1] and a wrapper to correctly subscribe it to return 64 bits instead of default 32 bits (as for times). It could a future cleanup. It is based on my previous {INTERNAL,INLINE}_SYSCALL_CALL macro [2], although it is mainly for simplification. Tested on x86_64, i686, aarch64, armhf, and powerpc64le. * nptl/Makefile (libpthread-routines): Remove ptw-llseek and add ptw-lseek64. * sysdeps/unix/sysv/linux/Makefile (sysdeps_routines): Remove llseek. * sysdeps/unix/sysv/linux/alpha/Makefile (sysdeps_routines): Likewise. * sysdeps/unix/sysv/linux/generic/wordsize-32/llseek.c: Remove file. * sysdeps/unix/sysv/linux/generic/wordsize-32/lseek.c: Remove file. * sysdeps/unix/sysv/linux/mips/mips64/llseek.c: Likewise. * sysdeps/unix/sysv/linux/llseek.c: Remove file. * sysdeps/unix/sysv/linux/lseek.c: New file. * sysdeps/unix/sysv/linux/lseek64.c: Add default Linux implementation. * sysdeps/unix/sysv/linux/mips/mips64/syscalls.list: Remove lseek and __libc_lseek64 from auto-generation. * sysdeps/unix/sysv/linux/wordsize-64/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/x86_64/x32/lseek64.S: New file. [1] https://sourceware.org/ml/libc-alpha/2016-08/msg00443.html [2] https://sourceware.org/ml/libc-alpha/2016-08/msg00646.html
* posix: Correctly enable/disable cancellation on Linux posix_spawnAdhemerval Zanella2016-09-201-1/+1
| | | | | | | | | | | | | | This patch correctly enable and disable asynchronous cancellation on Linux posix_spawn. Current code invert the logic by enabling and disabling instead. It also adds a new test to check if posix_spawn is not a cancellation entrypoint. Checked on x86_64, i686, powerpc64le, and aarch64. * nptl/Makefile (tests): Add tst-exec5. * nptl/tst-exec5.c: New file. * sysdeps/unix/sysv/linux/spawni.c (__spawni): Correctly enable and disable asynchronous cancellation.
* nptl: Set sem_open as a non cancellation point (BZ #15765)Adhemerval Zanella2016-09-151-1/+1
| | | | | | | | | | | | | This patch changes sem_open to not act as a cancellation point. Cancellation is disable at start and reenable in function exit. It fixes BZ #15765. Tested on x86_64 and i686. [BZ #15765] * nptl/Makefile (tests): Add tst-sem16. * nptl/tst-sem16.c: New file. * nptl/sem_open.c (sem_open): Disable asynchronous cancellation.
* Remove the ptw-% patternsFlorian Weimer2016-09-141-8/+13
| | | | | | | | | | Nothing depends on the PTW macro anymore, so the mechanism to define PTW for recompliations of libc routines is no longer needed. The source files are still recompiled for the nptl directory, just without the “ptw-” prefix. (Reducing the number of pattern rules in sysd-rules is critical for improving make performance.)
* elf: Do not use memalign for TCB/TLS blocks allocation [BZ #17730]Florian Weimer2016-08-031-2/+6
| | | | | | | | | | | | | | | | | | | Instead, call malloc and explicitly align the pointer. There is no external location to store the original (unaligned) pointer, and this commit increases the allocation size to store the pointer at a fixed location relative to the TCB pointer. The manual alignment means that some space goes unused which was previously made available for subsequent allocations. However, in the TLS_DTV_AT_TP case, the manual alignment code avoids aligning the pre-TCB to the TLS block alignment. (Even while using memalign, the allocation had some unused padding in front.) This concludes the removal of memalign calls from the TLS code, and the new tst-tls3-malloc test verifies that only core malloc routines are used.
* Revert "Add pretty printers for the NPTL lock types"Siddhesh Poyarekar2016-07-111-1/+0
| | | | | | | | | | | | | | | | This reverts commit 62ce266b0b261def2c6329be9814ffdcc11964d6. The change is not mature enough because it needs the following fixes: 1. Redirect test output to a file like other tests 2. Eliminate the need to use a .gdbinit because distributions will break without it. I should have caught that but I was in too much of a hurry to get the patch in :/ 3. Feature checking during configure to determine things like minimum required gdb version, python-pexpect version, etc. to make sure that tests work correctly.
* Add pretty printers for the NPTL lock typesMartin Galvan2016-07-081-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds pretty printers for the following NPTL types: - pthread_mutex_t - pthread_mutexattr_t - pthread_cond_t - pthread_condattr_t - pthread_rwlock_t - pthread_rwlockattr_t To load the pretty printers into your gdb session, do the following: python import sys sys.path.insert(0, '/path/to/glibc/build/nptl/pretty-printers') end source /path/to/glibc/source/pretty-printers/nptl-printers.py You can check which printers are registered and enabled by issuing the 'info pretty-printer' gdb command. Printers should trigger automatically when trying to print a variable of one of the types mentioned above. The printers are architecture-independent, and were manually tested on both the gdb CLI and Eclipse CDT. In order to work, the printers need to know the values of various flags that are scattered throughout pthread.h and pthreadP.h as enums and #defines. Since replicating these constants in the printers file itself would create a maintenance burden, I wrote a script called gen-py-const.awk that Makerules uses to extract the constants. This script is pretty much the same as gen-as-const.awk, except it doesn't cast the constant values to 'long' and is thorougly documented. The constants need only to be enumerated in a .pysym file, which is then referenced by a Make variable called gen-py-const-headers. As for the install directory, I discussed this with Mike Frysinger and Siddhesh Poyarekar, and we agreed that it can be handled in a separate patch, and it shouldn't block merging of this one. In addition, I've written a series of test cases for the pretty printers. Each lock type (mutex, condvar and rwlock) has two test programs, one for itself and other for its related 'attributes' object. Each test program in turn has a PExpect-based Python script that drives gdb and compares its output to the expected printer's. The tests run on the glibc host, which is assumed to have both gdb and PExpect; if either is absent the tests will fail with code 77 (UNSUPPORTED). For cross-testing you should use cross-test-ssh.sh as test-wrapper. I've tested the printers on both a native build and a cross build using a Beaglebone Black, with the build system's filesystem shared with the board through NFS. Finally, I've written a README that explains all this and more. Hopefully this should be good to go in now. Thanks. ChangeLog: 2016-07-04 Martin Galvan <martin.galvan@tallertechnologies.com> * Makeconfig (build-hardcoded-path-in-tests): Set to 'yes' for shared builds if tests-need-hardcoded-path is defined. (all-subdirs): Add pretty-printers. * Makerules ($(py-const)): New rule. * Rules (others): Add $(py-const), if defined. * nptl/Makefile (gen-py-const-headers): Define. * nptl/nptl-printers.py: New file. * nptl/nptl_lock_constants.pysym: Likewise. * pretty-printers/Makefile: Likewise. * pretty-printers/README: Likewise. * pretty-printers/test-condvar-attributes.c: Likewise. * pretty-printers/test-condvar-attributes.p: Likewise. * pretty-printers/test-condvar-printer.c: Likewise. * pretty-printers/test-condvar-printer.py: Likewise. * pretty-printers/test-mutex-attributes.c: Likewise. * pretty-printers/test-mutex-attributes.py: Likewise. * pretty-printers/test-mutex-printer.c: Likewise. * pretty-printers/test-mutex-printer.py: Likewise. * pretty-printers/test-rwlock-attributes.c: Likewise. * pretty-printers/test-rwlock-attributes.py: Likewise. * pretty-printers/test-rwlock-printer.c: Likewise. * pretty-printers/test-rwlock-printer.py: Likewise. * pretty-printers/test_common.py: Likewise. * scripts/gen-py-const.awk: Likewise.
* Add test case for bug 20263Andreas Schwab2016-07-071-1/+1
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* Compile tst-cleanupx4 test with -fexceptionsH.J. Lu2016-06-291-3/+5
| | | | | | | | | | | | | | | | tst-cleanupx4 is linked with tst-cleanupx4.o and tst-cleanup4aux.o. Since tst-cleanupx4.o is compiled from tst-cleanup4.c with -fexceptions, tst-cleanup4aux.c should also be compiled with -fexceptions. Tested on x86-64 and i686. [BZ #18645] * nptl/Makefile (extra-test-objs): Add tst-cleanupx4aux.o. (test-extras): Add tst-cleanupx4aux. (CFLAGS-tst-cleanupx4aux.c): New. Set to -fexceptions. ($(objpfx)tst-cleanupx4): Replace tst-cleanup4aux.o with tst-cleanupx4aux.o. * nptl/tst-cleanupx4aux.c: New file.
* nptl: Add sendmmsg and recvmmsg cancellation testsAdhemerval Zanella2016-06-131-1/+2
| | | | | | | | | | | | | | | | | | | | | This patch adds cancellation tests for both sendmmsg and recvmmsg syscalls. Since for some system configuration (x86_64/i686 on older kernels and non-Linux platforms), the tests are added as two independent that report as unsupported if the syscall is not presented. Both new tests uses the already tst-cancel4.c code, which as moved to a common tst-cancel4-common{.c,h} files. Tested on x86_64 and i686. * nptl/Makefile (test): Add tst-cancel4_1 and tst-cancel4_2. * nptl/tst-cancel4-common.c: New file. * nptl/tst-cancel4-common.h: Likewise. * nptl/tst-cancel4.c: Move common definitions to tst-cancel4-common.{c,h} file. * nptl/tst-cancel4_1.c: New test. * nptl/tst-cancel4_2.c: New test.
* Revert {send,sendm,recv,recvm}msg conformance changesAdhemerval Zanella2016-06-101-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | After some discussion in libc-alpha about this POSIX compliance fix, I see that GLIBC should indeed revert back to previous definition of msghdr and cmsghdr and implementation of sendmsg, recvmsg, sendmmsg, recvmmsg due some reasons: * The possible issue where the syscalls wrapper add the compatibility layer is quite limited in scope and range. And kernel current also add some limits to the values on the internal msghdr and cmsghdr fields: - msghdr::msg_iovlen larger than UIO_MAXIOV (1024) returns EMSGSIZE. - msghdr::msg_controllen larger than INT_MAX returns ENOBUFS. * There is a small performance hit for recvmsg/sendmsg/recmmsg which is neglectable, but it is a big hit for sendmmsg since now instead of calling the syscall for the packed structure, GLIBC is calling multiple sendmsg. This defeat the very existence of the syscall. * It currently breaks libsanitizer build on GCC [1] (I fixed on compiler-rt). However the fix is incomplete because it does add any runtime check since libsanitizer currently does not have any facility to intercept symbols with multiple version [2]. This, along with incorret dlsym/dlvsym return for versioned symbol due another bug [3], makes hard to interpose versioned symbols. Also, current approach of fixing GCC PR#71445 leads to half-baked solutions without versioned symbol interposing. This patch basically reverts commits 2f0dc39029ae08, 222c2d7f4357d66, af7f7c7ec8dea1. I decided to not revert abf29edd4a3918 (Adjust kernel-features.h defaults for recvmsg and sendmsg) mainly because it does not really address the POSIX compliance original issue and also adds some cleanups. Tested on x86, i386, s390, s390x, aarch64, and powerpc64le. [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71445 [2] https://github.com/google/sanitizers/issues/628 [3] https://sourceware.org/bugzilla/show_bug.cgi?id=14932 * conform/data/sys/socket.h-data (msghdr.msg_iovlen): Add xfail-. (msghdr.msg_controllen): Likewise. (cmsghdr.cmsg_len): Likewise. * nptl/Makefile (libpthread-routines): Remove ptw-oldrecvmsg and ptw-oldsendmsg. (CFLAGS-oldrecvmsg.c): Remove rule. (CFLAGS-oldsendmsg.c): Likewise. (CFLAGS-recvmsg.c): Add rule. (CFLAGS-sendmsg.c): Likewise. * sysdeps/unix/sysv/linux/Makefile (sysdep_routines): Remove oldrecvmsg, oldsendmsg, oldrecvmmsg, oldsendmmsg. (CFLAGS-recvmsg.c): Remove rule. (CFLAGS-sendmsg.c): Likewise. (CFLAGS-oldrecvmsg.c): Likewise. (CFLAGS-oldsendmsg.c): Likewise. (CFLAGS-recvmmsg.c): Likewise. * sysdeps/unix/sysv/linux/bits/socket.h (msghdr.msg_iovlen): Revert to kernel defined interfaces. (msghdr.msg_controllen): Likewise. (cmsghdr.cmsg_len): Likewise. (msghdr.__glibc_reserved1): Remove member. (msghdr.__glibc_reserved2): Likewise. (cmsghdr.__glibc_reserved1): Likewise. * sysdeps/unix/sysv/linux/oldrecvmmsg.c: Remove file. * sysdeps/unix/sysv/linux/oldrecvmsg.c: Likewise. * sysdeps/unix/sysv/linux/oldsendmmsg.c: Likewise. * sysdeps/unix/sysv/linux/oldsendmsg.c: Likewise. * sysdeps/unix/sysv/linux/recvmmsg.c: Revert back to previous version. * sysdeps/unix/sysv/linux/recvmsg.c: Likewise. * sysdeps/unix/sysv/linux/sendmmsg.c: Likewise. * sysdeps/unix/sysv/linux/sendmsg.c: Likewise. * sysdeps/unix/sysv/linux/aarch64/Versions [libc] (GLIBC_2.24): Remove recvmsg and sendmsg. * sysdeps/unix/sysv/linux/alpha/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/hppa/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/i386/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/m68k/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/microblaze/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/mips/mips32/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n32/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/nios2/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/powerpc/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc64/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/s390/s390-64/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/sh/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/sparc/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/tile/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/x86_64/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/Versions: Remove file * sysdeps/unix/sysv/linux/x86_64/64/Versions: Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n64/Versions: Likewise. * sysdeps/unix/sysv/linux/aarch64/libc.abilist: Remove new 2.24 version for {recv,send,recm,sendm}msg. * sysdeps/unix/sysv/linux/alpha/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/arm/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/hppa/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/i386/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/ia64/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/microblaze/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/nios2/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/sh/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/x86_64/64/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist: Likewise.
* network: Fix missing bits from {recv,send}{m}msg standard com,plianceAdhemerval Zanella2016-05-261-1/+1
| | | | | | | | | | | | | | | | | | | This patch fixes wrong/missing bits from the Fix {recv,send}{m}msg standard compliance (BZ#16919) patches: * nptl/Makefile sets CFLAGS-oldrecvfrom.c, but there's no such file as oldrecvfrom.c. It should be oldsendmsg.c as defined by ChangeLog. * sysdeps/unix/sysv/linux/hppa/Versions and sysdeps/unix/sysv/linux/i386/Versions list a symbol recvms instead of recvmsg at version GLIBC_2.24. * nptl/Makefile (CFLAGS-oldrecvfrom.c): Remove rule. (CFLAGS-oldsendmsg.c): Add rule. * sysdeps/unix/sysv/linux/hppa/Versions [libc] (GLIBC_2.24): Correct recvmsg symbol name. * sysdeps/unix/sysv/linux/i386/Versions [libc] (GLIBC_2.24): Likewise.
* network: recvmsg and sendmsg standard compliance (BZ#16919)Adhemerval Zanella2016-05-251-4/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | POSIX specifies that both msghdr::msg_iovlen and msghdr::msg_controllen to be of size int and socklen_t respectively. However Linux defines it as both size_t and for 64-bit it requires some adjustments to make the functions standard compliance. This patch fixes it by creating a temporary header and zeroing the pad fields for 64-bits architecture where size of size_t exceeds the size of the int. Also the new recvmsg and sendmsg implementation is only added on libc, with libpthread only containing a compat symbol. Tested on x86_64, i686, aarch64, armhf, and powerpc64le. * conform/data/sys/socket.h-data (msghdr.msg_iovlen): Remove xfail- and change to correct expected type. (msghdr.msg_controllen): Likewise. (cmsghdr.cmsg_len): Likewise. * sysdeps/unix/sysv/linux/bits/socket.h (msghdr.msg_iovlen): Fix expected POSIX assumption about the size. (msghdr.msg_controllen): Likewise. (msghdr.__glibc_reserved1): Likewise. (msghdr.__glibc_reserved2): Likewise. (cmsghdr.cmsg_len): Likewise. (cmsghdr.__glibc_reserved1): Likewise. * nptl/Makefile (libpthread-routines): Remove ptw-recvmsg and ptw-sendmsg. Add ptw-oldrecvmsg and ptw-oldsendmsg. (CFLAGS-sendmsg.c): Remove rule. (CFLAGS-recvmsg.c): Likewise. (CFLAGS-oldsendmsg.c): Add rule. (CFLAGS-oldrecvmsg.c): Likewise. * sysdeps/unix/sysv/linux/alpha/Versions [libc] (GLIBC_2.24): Add recvmsg and sendmsg. * sysdeps/unix/sysv/linux/aarch64/Version [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/arm/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/hppa/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/i386/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/ia64/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/m68k/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/microblaze/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/mips/mips32/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n32/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/mips/mips64/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/nios2/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/powerpc/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc64/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/s390/s390-64/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/sh/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/sparc/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/Versions [libc] (GLIBC_2.24): Likewise. ( sysdeps/unix/sysv/linux/tile/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/Versions [libc] (GLIBC_2.24): Likewise. ( sysdeps/unix/sysv/linux/x86_64/64/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/x84_64/Versions [libc] (GLIBC_2.24): Likewise. * sysdeps/unix/sysv/linux/Makefile [$(subdir) = socket)] (sysdep_headers): Add oldrecvmsg and oldsendmsg. (CFLAGS-sendmsg.c): Add rule. (CFLAGS-recvmsg.c): Likewise. (CFLAGS-oldsendmsg.c): Likewise. (CFLAGS-oldrecvmsg.c): Likewise. * sysdeps/unix/sysv/linux/check_native.c (__check_native): Fix msghdr initialization. * sysdeps/unix/sysv/linux/check_pf.c (make_request): Likewise. * sysdeps/unix/sysv/linux/ifaddrs.c (__netlink_request): Likewise. * sysdeps/unix/sysv/linux/oldrecvmsg.c: New file. * sysdeps/unix/sysv/linux/oldsendmsg.c: Likewise. * sysdeps/unix/sysv/linux/recvmsg.c (__libc_recvmsg): Adjust msghdr iovlen and controllen fields to adjust to POSIX specification. * sysdeps/unix/sysv/linux/sendmsg.c (__libc_sendmsg): Likewise. * sysdeps/unix/sysv/linux/aarch64/libc.abilist: New version and added recvmsg and sendmsg. * sysdeps/unix/sysv/linux/alpha/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/hppa/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/i386/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/ia64/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/microblaze/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/nios2/libc.abilist: Likewise * sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist: Likewise. * sysdeps/unix/linux/powerpc/powerpc32/nofpu/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist: Likewise. * sysdepe/unix/sysv/linux/powerpc/powerpc64/libc.abilist: Likewise. Likewise. Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/sh/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist: Likewise. Likewise. * sysdeps/unix/sysv/linux/x86_64/64/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist: Likewise.
* Don't do lock elision on an error checking mutex (bug 17514)Andreas Schwab2016-01-251-1/+1
| | | | | | Error checking mutexes are not supposed to be subject to lock elision. That would defeat the error checking nature of the mutex because lock elision doesn't record ownership.
* New pthread_barrier algorithm to fulfill barrier destruction requirements.Torvald Riegel2016-01-151-2/+2
| | | | | | | | | | The previous barrier implementation did not fulfill the POSIX requirements for when a barrier can be destroyed. Specifically, it was possible that threads that haven't noticed yet that their round is complete still access the barrier's memory, and that those accesses can happen after the barrier has been legally destroyed. The new algorithm does not have this issue, and it avoids using a lock internally.
* Update copyright dates with scripts/update-copyrights.Joseph Myers2016-01-041-1/+1
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* Add -std=gnu11 and -std=c11 NPTL initializers tests.Joseph Myers2015-10-271-1/+4
| | | | | | | | | | | | | | NPTL has tests that initializers work with various -std= options. Now that we can rely on -std=gnu11 and -std=c11 being available, this patch adds versions of those tests for those options. Tested for x86_64 and x86 (testsuite). * nptl/tst-initializers1-c11.c: New file. * nptl/tst-initializers1-gnu11.c: Likewise. * nptl/Makefile (tests): Add these new tests. (CFLAGS-tst-initializers1-c11.c): New variable. (CFLAGS-tst-initializers1-gnu11.c): Likewise.
* Remove sysdeps/nptl/configure.ac.Joseph Myers2015-10-271-2/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | sysdeps/nptl/configure.ac tests for forced unwind support and the C cleanup attribute, giving errors if either is unsupported. It does nothing beyond running those two tests. Both the attribute, and _Unwind_GetCFA which is used in the forced unwind test, were added in GCC 3.3. Thus these tests are long obsolete, and this patch removes the configure fragment running them, along with associated conditionals. Tested for x86_64 and x86 (testsuite, and that installed stripped shared libraries are unchanged by the patch). * sysdeps/nptl/configure.ac: Remove file. * sysdeps/nptl/configure: Remove generated file. * configure.ac (libc_cv_forced_unwind): Do not substitute. * configure: Regenerated. * config.h.in (HAVE_FORCED_UNWIND): Remove #undef. * config.make.in (have-forced-unwind): Remove variable. * nptl/Makefile [$(have-forced-unwind) = yes]: Make code unconditional. * nptl/descr.h [HAVE_FORCED_UNWIND]: Likewise. * nptl/unwind.c [HAVE_FORCED_UNWIND]: Likewise. (__pthread_unwind) [!HAVE_FORCED_UNWIND]: Remove conditional code. * nptl/version.c [HAVE_FORCED_UNWIND]: Make code unconditional. * sysdeps/nptl/Makefile [$(have-forced-unwind) = yes]: Make code unconditional.
* nptl: Add NPTL cases for cancellation failures casesAdhemerval Zanella2015-10-091-0/+1
| | | | | | | | | | | | This patch pthread cancellation tests to check for failures cases wherer the syscall cancel wrapper should both set the error and the errno values. Tested on i686, x86_64, x32, powerpc64le, and aarch64. * nptl/Makefile (tests): Add tst-cancel26.c and tst-cancel27.c. * nptl/tst-cancel26.c: New file. * nptl/tst-cancel27.c: Likewise.
* Add a test case for C++11 thread_local supportFlorian Weimer2015-10-061-1/+8
| | | | | This requires a C++ compiler with thread_local support, and a new configure check is needed.
* Use IE model for static variables in libc.so, libpthread.so and rtldSiddhesh Poyarekar2015-07-241-2/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The recently introduced TLS variables in the thread-local destructor implementation (__cxa_thread_atexit_impl) used the default GD access model, resulting in a call to __tls_get_addr. This causes a deadlock with recent changes to the way TLS is initialized because DTV allocations are delayed and hence despite knowing the offset to the variable inside its TLS block, the thread has to take the global rtld lock to safely update the TLS offset. This causes deadlocks when a thread is instantiated and joined inside a destructor of a dlopen'd DSO. The correct long term fix is to somehow not take the lock, but that will need a lot deeper change set to alter the way in which the big rtld lock is used. Instead, this patch just eliminates the call to __tls_get_addr for the thread-local variables inside libc.so, libpthread.so and rtld by building all of their units with -mtls-model=initial-exec. There were concerns that the static storage for TLS is limited and hence we should not be using it. Additionally, dynamically loaded modules may result in libc.so looking for this static storage pretty late in static binaries. Both concerns are valid when using TLSDESC since that is where one may attempt to allocate a TLS block from static storage for even those variables that are not IE. They're not very strong arguments for the traditional TLS model though, since it assumes that the static storage would be used sparingly and definitely not by default. Hence, for now this would only theoretically affect ARM architectures. The impact is hence limited to statically linked binaries that dlopen modules that in turn load libc.so, all that on arm hardware. It seems like a small enough impact to justify fixing the larger problem that currently affects everything everywhere. This still does not solve the original problem completely. That is, it is still possible to deadlock on the big rtld lock with a small tweak to the test case attached to this patch. That problem is however not a regression in 2.22 and hence could be tackled as a separate project. The test case is picked up as is from Alex's patch. This change has been tested to verify that it does not cause any issues on x86_64. ChangeLog: [BZ #18457] * nptl/Makefile (tests): New test case tst-join7. (modules-names): New test case module tst-join7mod. * nptl/tst-join7.c: New file. * nptl/tst-join7mod.c: New file. * Makeconfig (tls-model): Pass -ftls-model=initial-exec for all translation units in libc.so, libpthread.so and rtld.
* Avoid C++ tests when the C++ cannot be linkedAdhemerval Zanella2015-07-141-1/+1
| | | | | | | | | * elf/Makefile [ifeq (yes,$(build-shared)) (tests)] (tst-nodelete): Add iff $CXX is set. [ifeq (yes,$(build-shared)) (modules-names)] (tst-nodelete-rtldmod): Likewise. (tst-nodelete-zmodiff): Likewise. * nptl/Makefile [[ifeq (,$(CXX))] (tests-unsupported)]: Add tst-once5.
* The patch committed to fix bug #18435 caused regressions on aarch64Martin Sebor2015-07-091-0/+4
| | | | | | | | | | | | | and also powerpc64 and powerpc64le. See the discussion in the thread below for details. This change reverts the problematic bits leaving the added test in place and marking XFAIL in anticipation of fixing the bug in the near future. https://sourceware.org/ml/libc-alpha/2015-07/msg00141.html [BZ #18435] * nptl/pthreadP.h (pthread_cleanup_push, pthread_cleanup_pop): Revert commit ed225df3ad9cbac3c22ec3f0fbbed1f9c61d1c54. * nptl/Makefile (test-xfail-tst-once5): Define.
* The C++ 2011 std::call_once function is specified to allowMartin Sebor2015-07-011-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | the initialization routine to exit by throwing an exception. Such an execution, termed exceptional, requires call_once to propagate the exception to its caller. A program may contain any number of exceptional executions but only one returning execution (which, if it exists, must be the last execution with the same once flag). On POSIX systems such as Linux, std::call_once is implemented in terms of pthread_once. However, as discussed in libstdc++ bug 66146 - "call_once not C++11-compliant on ppc64le," GLIBC's pthread_once hangs when the initialization function exits by throwing an exception on at least arm and ppc64 (though apparently not on x86_64). This effectively prevents call_once from conforming to the C++ requirements since there doesn't appear to be a thread-safe way to work around this problem in libstdc++. This patch changes pthread_once to handle gracefully init functions that exit by throwing exceptions. It was successfully tested on ppc64, ppc64le, and x86_64. [BZ #18435] * nptl/Makefile: Add tst-once5.cc. * nptl/pthreadP.h (pthread_cleanup_push, pthread_cleanup_pop): Remove macro redefinitions. * nptl/tst-once5.cc: New test.
* nptl: restore .interp section in libpthread.soGleb Fotengauer-Malinovskiy2015-06-101-2/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | In commit 02657da2cf4457804ed938ee08b8316249126444, .interp section was removed from libpthread.so. This led to an error: $ /lib64/libpthread.so.0 Native POSIX Threads Library by Ulrich Drepper et al Copyright (C) 2015 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Forced unwind support included. Segmentation fault (gdb) bt #0 0x00000000000055a6 in _exit@plt () Unfortunately, there is no way to add a regression test for the bug because .interp specifies the path to dynamic linker of the target system. [BZ #18479] * nptl/pt-interp.c: New file. * nptl/Makefile (libpthread-routines, libpthread-shared-only-routines): Add pt-interp. [$(build-shared) = yes] ($(objpfx)pt-interp.os): Depend on $(common-objpfx)runtime-linker.h.
* Fix missing wake-ups in pthread_rwlock_rdlock.Torvald Riegel2015-06-041-1/+1
| | | | | | | | | This adds wake-ups that would be missing if assuming that for a non-writer-preferring rwlock, if one thread has acquired a rdlock and does not release it, another thread will eventually acquire a rdlock too despite concurrent write lock acquisition attempts. BZ 14958 is about supporting this assumption. Strictly speaking, this isn't a valid test case, but nonetheless worth supporting (see comment 7 of BZ 14958).
* Fix lost wake-up when pthread_rwlock_timedrwlock times out.Torvald Riegel2015-06-041-0/+1
| | | | | | | | | | If we set up a rwlock to prefer writers (and disallow recursive rdlock acquisitions), then readers will block for writers that are blocked to acquire the lock (otherwise, readers could constantly enter and exit, and the writer would never get the lock). However, the existing implementation did not wake such readers when the writer timed out. This patch adds the missing wake-up. There's no similar case for writers being blocked on readers.
* Split timed-wait functions out of nptl/lowlevellock.c.Roland McGrath2015-05-261-0/+1
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* Remove socket.S implementationAdhemerval Zanella2015-05-221-0/+6
| | | | | | | | | | | | | | | This patch removes the socket.S implementation for all ports and replace it by a C implementation using socketcall. For ports that implement the syscall directly, there is no change. The patch idea is to simplify the socket function implementation that uses the socketcall to be based on C implemetation instead of a pseudo assembly implementation with arch specific parts. The patch then remove the assembly implementatation for the ports which uses socketcall (i386, microblaze, mips, powerpc, sparc, m68k, s390 and sh). I have cross-build GLIBC for afore-mentioned ports and tested on both i386 and ppc32 without regressions.
* BZ#18434: Fix sem_post EOVERFLOW check for [!__HAVE_64B_ATOMICS].Roland McGrath2015-05-191-0/+1
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* Let tests result in UNSUPPORTED; use that for unbuildable C++ casesRoland McGrath2015-03-101-9/+9
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