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/* Copyright (C) 2003-2014 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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, see
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include <shlib-compat.h>
#include <lowlevellock.h>
#include <lowlevelcond.h>
#include <kernel-features.h>
#include <pthread-errnos.h>
#include "lowlevel-atomic.h"
.text
/* int pthread_cond_signal (pthread_cond_t *cond) */
.globl __pthread_cond_signal
.type __pthread_cond_signal, @function
.align 5
cfi_startproc
__pthread_cond_signal:
mov.l r8, @-r15
cfi_adjust_cfa_offset (4)
cfi_rel_offset (r8, 0)
sts.l pr, @-r15
cfi_adjust_cfa_offset (4)
cfi_rel_offset (pr, 0)
mov r4, r8
/* Get internal lock. */
mov #0, r3
mov #1, r4
#if cond_lock != 0
CMPXCHG (r3, @(cond_lock,r8), r4, r2)
#else
CMPXCHG (r3, @r8, r4, r2)
#endif
bf 1f
2:
mov.l @(total_seq+4,r8),r0
mov.l @(total_seq,r8),r1
mov.l @(wakeup_seq+4,r8), r2
cmp/hi r2, r0
bt 3f
cmp/hi r0, r2
bt 4f
mov.l @(wakeup_seq,r8), r2
cmp/hi r2, r1
bf 4f
3:
/* Bump the wakeup number. */
mov #1, r2
mov #0, r3
clrt
mov.l @(wakeup_seq,r8),r0
mov.l @(wakeup_seq+4,r8),r1
addc r2, r0
addc r3, r1
mov.l r0,@(wakeup_seq,r8)
mov.l r1,@(wakeup_seq+4,r8)
mov.l @(cond_futex,r8),r0
add r2, r0
mov.l r0,@(cond_futex,r8)
/* Wake up one thread. */
mov r8, r4
add #cond_futex, r4
mov.l @(dep_mutex,r8), r0
cmp/eq #-1, r0
bt/s 99f
mov #FUTEX_WAKE_OP, r5
#ifdef __ASSUME_PRIVATE_FUTEX
mov #(FUTEX_WAKE_OP|FUTEX_PRIVATE_FLAG), r5
extu.b r5, r5
#else
stc gbr, r1
mov.w .Lpfoff, r2
add r2, r1
mov.l @r1, r5
mov #FUTEX_WAKE_OP, r0
or r0, r5
#endif
99:
mov #1, r6
mov #0, r7
mov r8, r0
add #cond_lock, r0
mov.l .Lfutexop, r1
mov #SYS_futex, r3
extu.b r3, r3
trapa #0x14
SYSCALL_INST_PAD
/* For any kind of error, we try again with WAKE.
The general test also covers running on old kernels. */
mov r0, r1
mov #-12, r2
shad r2, r1
not r1, r1
tst r1, r1
bt 7f
6:
cfi_remember_state
lds.l @r15+, pr
cfi_adjust_cfa_offset (-4)
cfi_restore (pr)
mov.l @r15+, r8
cfi_adjust_cfa_offset (-4)
cfi_restore (r8)
rts
mov #0, r0
cfi_restore_state
#ifndef __ASSUME_PRIVATE_FUTEX
.Lpfoff:
.word PRIVATE_FUTEX - TLS_PRE_TCB_SIZE
#endif
.align 2
.Lfutexop:
.long FUTEX_OP_CLEAR_WAKE_IF_GT_ONE
7:
/* r5 should be either FUTEX_WAKE_OP or
FUTEX_WAKE_OP|FUTEX_PRIVATE_FLAG from the previous syscall. */
mov #(FUTEX_WAKE ^ FUTEX_WAKE_OP), r0
xor r0, r5
trapa #0x14
SYSCALL_INST_PAD
4:
/* Unlock. */
#if cond_lock != 0
DEC (@(cond_lock,r8), r2)
#else
DEC (@r8, r2)
#endif
tst r2, r2
bt 6b
5:
/* Unlock in loop requires wakeup. */
mov r8, r4
#if cond_lock != 0
add #cond_lock, r4
#endif
mov.l @(dep_mutex,r8), r0
cmp/eq #-1, r0
bf/s 99f
mov #LLL_PRIVATE, r5
mov #LLL_SHARED, r5
99:
mov.l .Lwake4, r1
bsrf r1
extu.b r5, r5
.Lwake4b:
bra 6b
nop
1:
/* Initial locking failed. */
mov r8, r5
#if cond_lock != 0
add #cond_lock, r5
#endif
mov.l @(dep_mutex,r8), r0
cmp/eq #-1, r0
bf/s 99f
mov #LLL_PRIVATE, r6
mov #LLL_SHARED, r6
99:
extu.b r6, r6
mov.l .Lwait4, r1
bsrf r1
mov r2, r4
.Lwait4b:
bra 2b
nop
cfi_endproc
.align 2
.Lwait4:
.long __lll_lock_wait-.Lwait4b
.Lwake4:
.long __lll_unlock_wake-.Lwake4b
.size __pthread_cond_signal, .-__pthread_cond_signal
versioned_symbol (libpthread, __pthread_cond_signal, pthread_cond_signal,
GLIBC_2_3_2)
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