diff options
Diffstat (limited to 'libpthread/nptl/sysdeps/unix/sysv/linux/i386/i486/sem_post.S')
| -rw-r--r-- | libpthread/nptl/sysdeps/unix/sysv/linux/i386/i486/sem_post.S | 76 |
1 files changed, 61 insertions, 15 deletions
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/i386/i486/sem_post.S b/libpthread/nptl/sysdeps/unix/sysv/linux/i386/i486/sem_post.S index a0dc39c8f..b077a20ca 100644 --- a/libpthread/nptl/sysdeps/unix/sysv/linux/i386/i486/sem_post.S +++ b/libpthread/nptl/sysdeps/unix/sysv/linux/i386/i486/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. @@ -19,15 +19,8 @@ #include <sysdep.h> #include <pthread-errnos.h> -#include <tls.h> - -#ifndef UP -# define LOCK lock -#else -# define -#endif - -#define FUTEX_WAKE 1 +#include <structsem.h> +#include <lowlevellock.h> .text @@ -36,25 +29,49 @@ .type __new_sem_post,@function .align 16 __new_sem_post: + cfi_startproc pushl %ebx + cfi_adjust_cfa_offset(4) + cfi_offset(%ebx, -8) movl 8(%esp), %ebx - movl $1, %edx + +#if VALUE == 0 + movl (%ebx), %eax +#else + movl VALUE(%ebx), %eax +#endif +0: cmpl $SEM_VALUE_MAX, %eax + je 3f + leal 1(%eax), %edx LOCK - xaddl %edx, (%ebx) +#if VALUE == 0 + cmpxchgl %edx, (%ebx) +#else + cmpxchgl %edx, VALUE(%ebx) +#endif + jnz 0b + + cmpl $0, NWAITERS(%ebx) + je 2f - movl $SYS_futex, %eax movl $FUTEX_WAKE, %ecx - addl $1, %edx + orl PRIVATE(%ebx), %ecx + movl $1, %edx + movl $SYS_futex, %eax ENTER_KERNEL testl %eax, %eax js 1f - xorl %eax, %eax +2: xorl %eax, %eax popl %ebx + cfi_adjust_cfa_offset(-4) + cfi_restore(%ebx) ret + cfi_adjust_cfa_offset(4) + cfi_offset(%ebx, -8) 1: #ifdef __PIC__ call __x86.get_pc_thunk.bx @@ -80,6 +97,35 @@ __new_sem_post: orl $-1, %eax popl %ebx ret + +3: +#ifdef __PIC__ + call __x86.get_pc_thunk.bx +#else + movl $5f, %ebx +5: +#endif + addl $_GLOBAL_OFFSET_TABLE_, %ebx +#if USE___THREAD +# ifdef NO_TLS_DIRECT_SEG_REFS + movl errno@gotntpoff(%ebx), %edx + addl %gs:0, %edx + movl $EOVERFLOW, (%edx) +# else + movl errno@gotntpoff(%ebx), %edx + movl $EOVERFLOW, %gs:(%edx) +# endif +#else + call __errno_location@plt + movl $EOVERFLOW, (%eax) +#endif + + orl $-1, %eax + popl %ebx + cfi_adjust_cfa_offset(-4) + cfi_restore(%ebx) + ret + cfi_endproc .size __new_sem_post,.-__new_sem_post weak_alias(__new_sem_post, sem_post) |