diff options
Diffstat (limited to 'libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/sem_post.S')
| -rw-r--r-- | libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/sem_post.S | 57 |
1 files changed, 41 insertions, 16 deletions
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/sem_post.S b/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/sem_post.S index 5c8a858ad..7af6524fe 100644 --- a/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/sem_post.S +++ b/libpthread/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, 2008 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. @@ -18,15 +18,9 @@ 02111-1307 USA. */ #include <sysdep.h> +#include <lowlevellock.h> #include <pthread-errnos.h> - -#ifndef UP -# define LOCK lock -#else -# define -#endif - -#define FUTEX_WAKE 1 +#include <structsem.h> .text @@ -35,30 +29,61 @@ .type sem_post,@function .align 16 sem_post: - movl $1, %edx +#if VALUE == 0 + movl (%rdi), %eax +#else + movl VALUE(%rdi), %eax +#endif +0: cmpl $SEM_VALUE_MAX, %eax + je 3f + leal 1(%rax), %esi LOCK - xaddl %edx, (%rdi) +#if VALUE == 0 + cmpxchgl %esi, (%rdi) +#else + cmpxchgl %esi, VALUE(%rdi) +#endif + jnz 0b + + cmpq $0, NWAITERS(%rdi) + je 2f movl $SYS_futex, %eax movl $FUTEX_WAKE, %esi - incl %edx + orl PRIVATE(%rdi), %esi + movl $1, %edx syscall testq %rax, %rax js 1f - xorl %eax, %eax +2: xorl %eax, %eax retq 1: #if USE___THREAD - movq errno@gottpoff(%rip), %rdx - movl $EINVAL, %fs:(%rdx) + movl $EINVAL, %eax +#else + callq __errno_location@plt + movl $EINVAL, %edx +#endif + jmp 4f + +3: +#if USE___THREAD + movl $EOVERFLOW, %eax #else callq __errno_location@plt - movl $EINVAL, (%rax) + movl $EOVERFLOW, %edx #endif +4: +#if USE___THREAD + movq errno@gottpoff(%rip), %rdx + movl %eax, %fs:(%rdx) +#else + movl %edx, (%rax) +#endif orl $-1, %eax retq .size sem_post,.-sem_post |