diff options
| author | Ulrich Drepper <drepper@redhat.com> | 2007-05-15 06:24:31 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2007-05-15 06:24:31 +0000 |
| commit | 83d87915da34fc02d170ff8c356406040da2823f (patch) | |
| tree | 7d76dcc1f12bd5dd7d65b329a3cd37422be12a82 /nptl/sysdeps/unix/sysv/linux/x86_64/sem_post.S | |
| parent | 1d47e92f71c36165364c8807e52d0d0dc0f66142 (diff) | |
* sysdeps/unix/sysv/linux/sem_post.c: Only wake threads if old
value of semaphore was zero.
* sysdeps/unix/sysv/linux/i386/i486/sem_post.S: Likewise.
* sysdeps/unix/sysv/linux/powerpc/sem_post.c: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc32/sem_post.c: Likewise.
* sysdeps/unix/sysv/linux/x86_64/sem_post.S: Likewise.
* sysdeps/unix/sysv/linux/x86_64/sem_wait.S: Remove unnecessary
extra cancellation test.
* sysdeps/unix/sysv/linux/x86_64/sem_timedwait.S: Likewise.
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/x86_64/sem_post.S')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/x86_64/sem_post.S | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/x86_64/sem_post.S b/nptl/sysdeps/unix/sysv/linux/x86_64/sem_post.S index 7f608a5974..cc3a9a9cee 100644 --- a/nptl/sysdeps/unix/sysv/linux/x86_64/sem_post.S +++ b/nptl/sysdeps/unix/sysv/linux/x86_64/sem_post.S @@ -1,4 +1,4 @@ -/* Copyright (C) 2002, 2003, 2005 Free Software Foundation, Inc. +/* Copyright (C) 2002, 2003, 2005, 2007 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. @@ -41,15 +41,18 @@ sem_post: LOCK xaddl %edx, (%rdi) + testl %edx, %edx + jne 2f + movl $SYS_futex, %eax movl $FUTEX_WAKE, %esi - incl %edx + movl $1, %edx syscall testq %rax, %rax js 1f - xorl %eax, %eax +2: xorl %eax, %eax retq 1: |