diff options
Diffstat (limited to 'nptl/sysdeps/pthread')
| -rw-r--r-- | nptl/sysdeps/pthread/bits/libc-lock.h | 13 | ||||
| -rwxr-xr-x | nptl/sysdeps/pthread/configure | 55 | ||||
| -rw-r--r-- | nptl/sysdeps/pthread/configure.in | 13 | ||||
| -rw-r--r-- | nptl/sysdeps/pthread/pthread-functions.h | 2 | ||||
| -rw-r--r-- | nptl/sysdeps/pthread/pthread.h | 103 |
5 files changed, 164 insertions, 22 deletions
diff --git a/nptl/sysdeps/pthread/bits/libc-lock.h b/nptl/sysdeps/pthread/bits/libc-lock.h index 3a3d3cc6d3..945a81cb82 100644 --- a/nptl/sysdeps/pthread/bits/libc-lock.h +++ b/nptl/sysdeps/pthread/bits/libc-lock.h @@ -345,6 +345,19 @@ typedef pthread_key_t __libc_key_t; } while (0) +/* Note that for I/O cleanup handling we are using the old-style + cancel handling. It does not have to be integrated with C++ snce + no C++ code is called in the middle. The old-style handling is + faster and the support is not going away. */ +extern void _pthread_cleanup_push (struct _pthread_cleanup_buffer *buffer, + void (*routine) (void *), void *arg); +extern void _pthread_cleanup_pop (struct _pthread_cleanup_buffer *buffer, + int execute); +extern void _pthread_cleanup_push_defer (struct _pthread_cleanup_buffer *buffer, + void (*routine) (void *), void *arg); +extern void _pthread_cleanup_pop_restore (struct _pthread_cleanup_buffer *buffer, + int execute); + /* Start critical region with cleanup. */ #define __libc_cleanup_region_start(DOIT, FCT, ARG) \ { struct _pthread_cleanup_buffer _buffer; \ diff --git a/nptl/sysdeps/pthread/configure b/nptl/sysdeps/pthread/configure index 8999d37e5a..50293a4f1c 100755 --- a/nptl/sysdeps/pthread/configure +++ b/nptl/sysdeps/pthread/configure @@ -5,3 +5,58 @@ if test "x$libc_cv_gcc___thread" != xyes; then echo "$as_me: error: compiler support for __thread is required" >&2;} { (exit 1); exit 1; }; } fi + + +echo "$as_me:$LINENO: checking for forced unwind support" >&5 +echo $ECHO_N "checking for forced unwind support... $ECHO_C" >&6 +if test "${libc_cv_forced_unwind+set}" = set; then + echo $ECHO_N "(cached) $ECHO_C" >&6 +else + cat >conftest.$ac_ext <<_ACEOF +#line $LINENO "configure" +/* confdefs.h. */ +_ACEOF +cat confdefs.h >>conftest.$ac_ext +cat >>conftest.$ac_ext <<_ACEOF +/* end confdefs.h. */ +#include <unwind.h> +int +main () +{ + +struct _Unwind_Exception exc; +struct _Unwind_Context *context; +_Unwind_GetCFA (context) + ; + return 0; +} +_ACEOF +rm -f conftest.$ac_objext conftest$ac_exeext +if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5 + (eval $ac_link) 2>&5 + ac_status=$? + echo "$as_me:$LINENO: \$? = $ac_status" >&5 + (exit $ac_status); } && + { ac_try='test -s conftest$ac_exeext' + { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5 + (eval $ac_try) 2>&5 + ac_status=$? + echo "$as_me:$LINENO: \$? = $ac_status" >&5 + (exit $ac_status); }; }; then + libc_cv_forced_unwind=yes +else + echo "$as_me: failed program was:" >&5 +sed 's/^/| /' conftest.$ac_ext >&5 + +libc_cv_forced_unwind=no +fi +rm -f conftest.$ac_objext conftest$ac_exeext conftest.$ac_ext +fi +echo "$as_me:$LINENO: result: $libc_cv_forced_unwind" >&5 +echo "${ECHO_T}$libc_cv_forced_unwind" >&6 +if test $libc_cv_forced_unwind = yes; then + cat >>confdefs.h <<\_ACEOF +#define HAVE_FORCED_UNWIND 1 +_ACEOF + +fi diff --git a/nptl/sysdeps/pthread/configure.in b/nptl/sysdeps/pthread/configure.in index 8350f86dc0..e4ea6830d6 100644 --- a/nptl/sysdeps/pthread/configure.in +++ b/nptl/sysdeps/pthread/configure.in @@ -4,3 +4,16 @@ GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory. if test "x$libc_cv_gcc___thread" != xyes; then AC_MSG_ERROR(compiler support for __thread is required) fi + +dnl Iff <unwind.h> is available, make sure it is the right one and it +dnl contains struct _Unwind_Exception. +AC_CACHE_CHECK(dnl +for forced unwind support, libc_cv_forced_unwind, [dnl +AC_TRY_LINK([#include <unwind.h>], [ +struct _Unwind_Exception exc; +struct _Unwind_Context *context; +_Unwind_GetCFA (context)], +libc_cv_forced_unwind=yes, libc_cv_forced_unwind=no)]) +if test $libc_cv_forced_unwind = yes; then + AC_DEFINE(HAVE_FORCED_UNWIND) +fi diff --git a/nptl/sysdeps/pthread/pthread-functions.h b/nptl/sysdeps/pthread/pthread-functions.h index 9f38e34053..93ba089982 100644 --- a/nptl/sysdeps/pthread/pthread-functions.h +++ b/nptl/sysdeps/pthread/pthread-functions.h @@ -85,6 +85,8 @@ struct pthread_functions int); #define HAVE_PTR_NTHREADS int *ptr_nthreads; + void (*ptr___pthread_unwind) (__pthread_unwind_buf_t *) + __attribute ((noreturn)) __cleanup_fct_attribute; }; /* Variable in libc.so. */ diff --git a/nptl/sysdeps/pthread/pthread.h b/nptl/sysdeps/pthread/pthread.h index 72673d11a6..5373b80dcf 100644 --- a/nptl/sysdeps/pthread/pthread.h +++ b/nptl/sysdeps/pthread/pthread.h @@ -26,6 +26,7 @@ #define __need_sigset_t #include <signal.h> #include <bits/pthreadtypes.h> +#include <bits/setjmp.h> /* Detach state. */ @@ -380,6 +381,24 @@ extern int pthread_cancel (pthread_t __th) __THROW; extern void pthread_testcancel (void) __THROW; +/* Cancellation handling with integration into exception handling. */ + +typedef struct +{ + void *__pad[16]; + struct + { + __jmp_buf __cancel_jmp_buf; + int __mask_was_saved; + } __cancel_jmp_buf[1]; +} __pthread_unwind_buf_t __attribute__ ((__aligned__)); + +/* No special attributes by default. */ +#ifndef __cleanup_fct_attribute +# define __cleanup_fct_attribute +#endif + + /* Install a cleanup handler: ROUTINE will be called with arguments ARG when the thread is cancelled or calls pthread_exit. ROUTINE will also be called with arguments ARG when the matching pthread_cleanup_pop @@ -387,43 +406,83 @@ extern void pthread_testcancel (void) __THROW; pthread_cleanup_push and pthread_cleanup_pop are macros and must always be used in matching pairs at the same nesting level of braces. */ -#define pthread_cleanup_push(routine,arg) \ - { struct _pthread_cleanup_buffer _buffer; \ - _pthread_cleanup_push (&_buffer, (routine), (arg)); - -extern void _pthread_cleanup_push (struct _pthread_cleanup_buffer *__buffer, - void (*__routine) (void *), void *__arg) - __THROW; +#define pthread_cleanup_push(routine, arg) \ + do { \ + __pthread_unwind_buf_t __cancel_buf; \ + void (*__cancel_routine) (void *) = (routine); \ + void *__cancel_arg = (arg); \ + int not_first_call = __sigsetjmp ((struct __jmp_buf_tag *) \ + __cancel_buf.__cancel_jmp_buf, 0); \ + if (__builtin_expect (not_first_call, 0)) \ + { \ + __cancel_routine (__cancel_arg); \ + __pthread_unwind_next (&__cancel_buf); \ + /* NOTREACHED */ \ + } \ + \ + __pthread_register_cancel (&__cancel_buf); \ + do { +extern void __pthread_register_cancel (__pthread_unwind_buf_t *__buf) + __cleanup_fct_attribute; /* Remove a cleanup handler installed by the matching pthread_cleanup_push. If EXECUTE is non-zero, the handler function is called. */ #define pthread_cleanup_pop(execute) \ - _pthread_cleanup_pop (&_buffer, (execute)); } - -extern void _pthread_cleanup_pop (struct _pthread_cleanup_buffer *__buffer, - int __execute) __THROW; + } while (0); \ + __pthread_unregister_cancel (&__cancel_buf); \ + if (execute) \ + __cancel_routine (__cancel_arg); \ + } while (0) +extern void __pthread_unregister_cancel (__pthread_unwind_buf_t *__buf) + __cleanup_fct_attribute; #ifdef __USE_GNU /* Install a cleanup handler as pthread_cleanup_push does, but also saves the current cancellation type and sets it to deferred cancellation. */ -# define pthread_cleanup_push_defer_np(routine,arg) \ - { struct _pthread_cleanup_buffer _buffer; \ - _pthread_cleanup_push_defer (&_buffer, (routine), (arg)); - -extern void _pthread_cleanup_push_defer (struct _pthread_cleanup_buffer *__buffer, - void (*__routine) (void *), - void *__arg) __THROW; +# define pthread_cleanup_push_defer(routine, arg) \ + do { \ + __pthread_unwind_buf_t __cancel_buf; \ + void (*__cancel_routine) (void *) = (routine); \ + void *__cancel_arg = (arg); \ + int not_first_call = __sigsetjmp ((struct __jmp_buf_tag *) \ + __cancel_buf.__cancel_jmp_buf, 0); \ + if (__builtin_expect (not_first_call, 0)) \ + { \ + __cancel_routine (__cancel_arg); \ + __pthread_unwind_next (&__cancel_buf); \ + /* NOTREACHED */ \ + } \ + \ + __pthread_register_cancel_defer (&__cancel_buf); \ + do { +extern void __pthread_register_cancel_defer (__pthread_unwind_buf_t *__buf) + __cleanup_fct_attribute; /* Remove a cleanup handler as pthread_cleanup_pop does, but also restores the cancellation type that was in effect when the matching pthread_cleanup_push_defer was called. */ -# define pthread_cleanup_pop_restore_np(execute) \ - _pthread_cleanup_pop_restore (&_buffer, (execute)); } +# define pthread_cleanup_pop_cleanup(execute) \ + } while (0); \ + __pthread_unregister_cancel_restore (&__cancel_buf); \ + if (execute) \ + __cancel_routine (__cancel_arg); \ + } while (0) +extern void __pthread_unregister_cancel_restore (__pthread_unwind_buf_t *__buf) + __cleanup_fct_attribute; +#endif -extern void _pthread_cleanup_pop_restore (struct _pthread_cleanup_buffer *__buffer, - int __execute) __THROW; +/* Internal interface to initiate cleanup. */ +extern void __pthread_unwind_next (__pthread_unwind_buf_t *__buf) + __cleanup_fct_attribute __attribute ((__noreturn__)) +#ifndef SHARED + __attribute ((__weak__)) #endif + ; + +/* Function used in the macros. */ +struct __jmp_buf_tag; +extern int __sigsetjmp (struct __jmp_buf_tag __env[1], int __savemask) __THROW; /* Mutex handling. */ |