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 | 89 |
1 files changed, 89 insertions, 0 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 new file mode 100644 index 000000000..7af6524fe --- /dev/null +++ b/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/sem_post.S @@ -0,0 +1,89 @@ +/* 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. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <sysdep.h> +#include <lowlevellock.h> +#include <pthread-errnos.h> +#include <structsem.h> + + + .text + + .globl sem_post + .type sem_post,@function + .align 16 +sem_post: +#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 +#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 + orl PRIVATE(%rdi), %esi + movl $1, %edx + syscall + + testq %rax, %rax + js 1f + +2: xorl %eax, %eax + retq + +1: +#if USE___THREAD + 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 $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 |