1 /* Copyright (C) 2002, 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
21 #include <shlib-compat.h>
22 #include <lowlevellock.h>
23 #include <lowlevelcond.h>
24 #include <kernel-features.h>
25 #include <pthread-errnos.h>
30 /* int pthread_cond_signal (pthread_cond_t *cond) */
31 .globl __pthread_cond_signal
32 .type __pthread_cond_signal, @function
34 __pthread_cond_signal:
38 cfi_adjust_cfa_offset(4)
40 cfi_adjust_cfa_offset(4)
46 /* Get internal lock. */
53 cmpxchgl %edx, cond_lock(%edi)
57 2: leal cond_futex(%edi), %ebx
58 movl total_seq+4(%edi), %eax
59 movl total_seq(%edi), %ecx
60 cmpl wakeup_seq+4(%edi), %eax
62 /* Must use leal to preserve the flags. */
63 leal cond_lock(%edi), %edi
67 cmpl wakeup_seq-cond_futex(%ebx), %ecx
70 /* Bump the wakeup number. */
71 3: addl $1, wakeup_seq-cond_futex(%ebx)
72 adcl $0, wakeup_seq-cond_futex+4(%ebx)
75 /* Wake up one thread. */
77 cfi_adjust_cfa_offset(4)
79 cfi_adjust_cfa_offset(4)
83 #if FUTEX_PRIVATE_FLAG > 255
86 cmpl $-1, dep_mutex-cond_futex(%ebx)
89 #ifdef __ASSUME_PRIVATE_FUTEX
90 andl $FUTEX_PRIVATE_FLAG, %ecx
92 andl %gs:PRIVATE_FUTEX, %ecx
94 addl $FUTEX_WAKE_OP, %ecx
98 movl $FUTEX_OP_CLEAR_WAKE_IF_GT_ONE, %ebp
99 /* FIXME: Until Ingo fixes 4G/4G vDSO, 6 arg syscalls are broken for
104 cfi_adjust_cfa_offset(-4)
107 cfi_adjust_cfa_offset(-4)
110 /* For any kind of error, we try again with WAKE.
111 The general test also covers running on old kernels. */
117 cfi_adjust_cfa_offset(-4)
120 cfi_adjust_cfa_offset(-4)
124 cfi_adjust_cfa_offset(8)
126 cfi_offset(%edi, -12)
128 7: /* %ecx should be either FUTEX_WAKE_OP or
129 FUTEX_WAKE_OP|FUTEX_PRIVATE_FLAG from the previous syscall. */
130 xorl $(FUTEX_WAKE ^ FUTEX_WAKE_OP), %ecx
131 movl $SYS_futex, %eax
132 /* %edx should be 1 already from $FUTEX_WAKE_OP syscall.
136 /* Unlock. Note that at this point %edi always points to
142 /* Unlock in loop requires wakeup. */
144 #if (LLL_SHARED-LLL_PRIVATE) > 255
147 cmpl $-1, dep_mutex-cond_futex(%ebx)
150 andl $(LLL_SHARED-LLL_PRIVATE), %ecx
152 addl $LLL_PRIVATE, %ecx
154 call __lll_unlock_wake
157 /* Initial locking failed. */
162 leal cond_lock(%edi), %edx
164 #if (LLL_SHARED-LLL_PRIVATE) > 255
167 cmpl $-1, dep_mutex(%edi)
170 andl $(LLL_SHARED-LLL_PRIVATE), %ecx
172 addl $LLL_PRIVATE, %ecx
178 .size __pthread_cond_signal, .-__pthread_cond_signal
179 versioned_symbol (libpthread, __pthread_cond_signal, pthread_cond_signal,