diff options
Diffstat (limited to 'libpthread/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_signal.S')
| -rw-r--r-- | libpthread/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_signal.S | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_signal.S b/libpthread/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_signal.S new file mode 100644 index 000000000..11650c8e1 --- /dev/null +++ b/libpthread/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_signal.S @@ -0,0 +1,110 @@ +/* Copyright (C) 2002, 2003, 2004 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 <lowlevelcond.h> +#include <bits/kernel-features.h> + +#ifdef UP +# define LOCK +#else +# define LOCK lock +#endif + +#define FUTEX_WAIT 0 +#define FUTEX_WAKE 1 +#define FUTEX_REQUEUE 3 + +#define EINVAL 22 + + + .text + + /* int pthread_cond_signal (pthread_cond_t *cond) */ + .globl __pthread_cond_signal + .type __pthread_cond_signal, @function + .align 16 +__pthread_cond_signal: + + pushl %ebx + pushl %edi + + movl 12(%esp), %edi + + /* Get internal lock. */ + movl $1, %edx + xorl %eax, %eax + LOCK +#if cond_lock == 0 + cmpxchgl %edx, (%edi) +#else + cmpxchgl %edx, cond_lock(%edi) +#endif + jnz 1f + +2: leal cond_futex(%edi), %ebx + movl total_seq+4(%edi), %eax + movl total_seq(%edi), %ecx + cmpl wakeup_seq+4(%edi), %eax +#if cond_lock != 0 + /* Must use leal to preserve the flags. */ + leal cond_lock(%edi), %edi +#endif + ja 3f + jb 4f + cmpl wakeup_seq-cond_futex(%ebx), %ecx + jbe 4f + + /* Bump the wakeup number. */ +3: addl $1, wakeup_seq-cond_futex(%ebx) + adcl $0, wakeup_seq-cond_futex+4(%ebx) + addl $1, (%ebx) + + /* Wake up one thread. */ + movl $FUTEX_WAKE, %ecx + movl $SYS_futex, %eax + movl $1, %edx + ENTER_KERNEL + + /* Unlock. Note that at this point %edi always points to + cond_lock. */ +4: LOCK + subl $1, (%edi) + jne 5f + +6: xorl %eax, %eax + popl %edi + popl %ebx + ret + + /* Initial locking failed. */ +1: +#if cond_lock == 0 + movl %edi, %ecx +#else + leal cond_lock(%edi), %ecx +#endif + call __lll_mutex_lock_wait + jmp 2b + + /* Unlock in loop requires wakeup. */ +5: movl %edi, %eax + call __lll_mutex_unlock_wake + jmp 6b + .size __pthread_cond_signal, .-__pthread_cond_signal |