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authorAdhemerval Zanella <adhemerval.zanella@linaro.org>2018-05-10 17:24:56 -0300
committerAdhemerval Zanella <adhemerval.zanella@linaro.org>2019-01-03 18:38:16 -0200
commitce7eb0e90315eb1939ac29f656d39b3db858c092 (patch)
tree66f46e348749230c9fb9c95e7d77b01eff8598c9 /nptl/sem_wait.c
parent0b13e25581afb4ce95373f18249b91c104280a13 (diff)
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nptl: Cleanup cancellation macros
This patch wraps all uses of *_{enable,disable}_asynccancel and
and *_CANCEL_{ASYNC,RESET} in either already provided macros
(lll_futex_timed_wait_cancel) or creates new ones if the
functionality is not provided (SYSCALL_CANCEL_NCS, lll_futex_wait_cancel,
and lll_futex_timed_wait_cancel).

Also for some generic implementations, the direct call of the macros
are removed since the underlying symbols are suppose to provide
cancellation support.

This is a priliminary patch intended to simplify the work required
for BZ#12683 fix.  It is a refactor change, no semantic changes are
expected.

Checked on x86_64-linux-gnu and i686-linux-gnu.

	* nptl/pthread_join_common.c (__pthread_timedjoin_ex): Use
	lll_wait_tid with timeout.
	* nptl/sem_wait.c (__old_sem_wait): Use lll_futex_wait_cancel.
	* sysdeps/nptl/aio_misc.h (AIO_MISC_WAIT): Use
	futex_reltimed_wait_cancelable for cancelabla mode.
	* sysdeps/nptl/gai_misc.h (GAI_MISC_WAIT): Likewise.
	* sysdeps/posix/open64.c (__libc_open64): Do not call cancelation
	macros.
	* sysdeps/posix/sigwait.c (__sigwait): Likewise.
	* sysdeps/posix/waitid.c (__sigwait): Likewise.
	* sysdeps/unix/sysdep.h (__SYSCALL_CANCEL_CALL,
	SYSCALL_CANCEL_NCS): New macro.
	* sysdeps/nptl/lowlevellock.h (lll_wait_tid): Add timeout argument.
	(lll_timedwait_tid): Remove macro.
	* sysdeps/unix/sysv/linux/i386/lowlevellock.h (lll_wait_tid):
	Likewise.
	(lll_timedwait_tid): Likewise.
	* sysdeps/unix/sysv/linux/sparc/lowlevellock.h (lll_wait_tid):
	Likewise.
	(lll_timedwait_tid): Likewise.
	* sysdeps/unix/sysv/linux/x86_64/lowlevellock.h (lll_wait_tid):
	Likewise.
	(lll_timedwait_tid): Likewise.
	* sysdeps/unix/sysv/linux/clock_nanosleep.c (__clock_nanosleep):
	Use INTERNAL_SYSCALL_CANCEL.
	* sysdeps/unix/sysv/linux/futex-internal.h
	(futex_reltimed_wait_cancelable): Use LIBC_CANCEL_{ASYNC,RESET}
	instead of __pthread_{enable,disable}_asynccancel.
	* sysdeps/unix/sysv/linux/lowlevellock-futex.h
	(lll_futex_wait_cancel): New macro.
Diffstat (limited to 'nptl/sem_wait.c')
-rw-r--r--nptl/sem_wait.c8
1 files changed, 1 insertions, 7 deletions
diff --git a/nptl/sem_wait.c b/nptl/sem_wait.c
index 61bdd9bf4f..6a2d26bd1a 100644
--- a/nptl/sem_wait.c
+++ b/nptl/sem_wait.c
@@ -56,14 +56,8 @@ __old_sem_wait (sem_t *sem)
       if (atomic_decrement_if_positive (futex) > 0)
 	return 0;
 
-      /* Enable asynchronous cancellation.  Required by the standard.  */
-      int oldtype = __pthread_enable_asynccancel ();
-
       /* Always assume the semaphore is shared.  */
-      err = lll_futex_wait (futex, 0, LLL_SHARED);
-
-      /* Disable asynchronous cancellation.  */
-      __pthread_disable_asynccancel (oldtype);
+      err = lll_futex_wait_cancel (futex, 0, LLL_SHARED);
     }
   while (err == 0 || err == -EWOULDBLOCK);