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/* Copyright (C) 2002, 2003, 2004, 2005, 2006 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 <shlib-compat.h>
#include <lowlevelcond.h>
#include <kernel-features.h>
#include <pthread-pi-defines.h>
#ifdef UP
# define LOCK
#else
# define LOCK lock
#endif
#define SYS_futex 202
#define FUTEX_WAIT 0
#define FUTEX_WAKE 1
#define FUTEX_REQUEUE 3
#define FUTEX_CMP_REQUEUE 4
#define EINVAL 22
.text
/* int pthread_cond_broadcast (pthread_cond_t *cond) */
.globl __pthread_cond_broadcast
.type __pthread_cond_broadcast, @function
.align 16
__pthread_cond_broadcast:
/* Get internal lock. */
movl $1, %esi
xorl %eax, %eax
LOCK
#if cond_lock == 0
cmpxchgl %esi, (%rdi)
#else
cmpxchgl %esi, cond_lock(%rdi)
#endif
jnz 1f
2: addq $cond_futex, %rdi
movq total_seq-cond_futex(%rdi), %r9
cmpq wakeup_seq-cond_futex(%rdi), %r9
jna 4f
/* Cause all currently waiting threads to recognize they are
woken up. */
movq %r9, wakeup_seq-cond_futex(%rdi)
movq %r9, woken_seq-cond_futex(%rdi)
addq %r9, %r9
movl %r9d, (%rdi)
incl broadcast_seq-cond_futex(%rdi)
/* Get the address of the mutex used. */
movq dep_mutex-cond_futex(%rdi), %r8
/* Unlock. */
LOCK
decl cond_lock-cond_futex(%rdi)
jne 7f
8: cmpq $-1, %r8
je 9f
/* XXX: The kernel so far doesn't support requeue to PI futex. */
testl $PI_BIT, MUTEX_KIND(%r8)
jne 9f
/* Wake up all threads. */
movl $FUTEX_CMP_REQUEUE, %esi
movl $SYS_futex, %eax
movl $1, %edx
movl $0x7fffffff, %r10d
syscall
/* For any kind of error, which mainly is EAGAIN, we try again
with WAKE. The general test also covers running on old
kernels. */
cmpq $-4095, %rax
jae 9f
10: xorl %eax, %eax
retq
.align 16
/* Unlock. */
4: LOCK
decl cond_lock-cond_futex(%rdi)
jne 5f
6: xorl %eax, %eax
retq
/* Initial locking failed. */
1:
#if cond_lock != 0
addq $cond_lock, %rdi
#endif
callq __lll_mutex_lock_wait
#if cond_lock != 0
subq $cond_lock, %rdi
#endif
jmp 2b
/* Unlock in loop requires wakeup. */
5: addq $cond_lock-cond_futex, %rdi
callq __lll_mutex_unlock_wake
jmp 6b
/* Unlock in loop requires wakeup. */
7: addq $cond_lock-cond_futex, %rdi
callq __lll_mutex_unlock_wake
subq $cond_lock-cond_futex, %rdi
jmp 8b
9: /* The futex requeue functionality is not available. */
movl $0x7fffffff, %edx
movl $FUTEX_WAKE, %esi
movl $SYS_futex, %eax
syscall
jmp 10b
.size __pthread_cond_broadcast, .-__pthread_cond_broadcast
versioned_symbol (libpthread, __pthread_cond_broadcast, pthread_cond_broadcast,
GLIBC_2_3_2)
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