1 /* Copyright (C) 2002, 2003, 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 <lowlevelrwlock.h>
22 #include <pthread-errnos.h>
25 #define SYS_gettimeofday __NR_gettimeofday
39 .globl pthread_rwlock_timedrdlock
40 .type pthread_rwlock_timedrdlock,@function
42 pthread_rwlock_timedrdlock:
59 cmpxchgl %edx, MUTEX(%ebp)
63 2: movl WRITER(%ebp), %eax
66 cmpl $0, WRITERS_QUEUED(%ebp)
71 /* Check the value of the timeout parameter. */
72 3: cmpl $1000000000, 4(%edi)
75 addl $1, READERS_QUEUED(%ebp)
78 movl READERS_WAKEUP(%ebp), %esi
88 /* Get current time. */
91 movl $SYS_gettimeofday, %eax
94 /* Compute relative timeout. */
97 mul %edx /* Milli seconds to nano seconds. */
103 addl $1000000000, %edx
106 js 16f /* Time is already up. */
109 movl %ecx, (%esp) /* Store relative timeout. */
113 #if __ASSUME_PRIVATE_FUTEX
114 movzbl PSHARED(%ebp), %ecx
115 xorl $FUTEX_PRIVATE_FLAG|FUTEX_WAIT, %ecx
117 movzbl PSHARED(%ebp), %ecx
119 orl $FUTEX_WAIT, %ecx
121 xorl %gs:PRIVATE_FUTEX, %ecx
124 leal READERS_WAKEUP(%ebp), %ebx
125 movl $SYS_futex, %eax
130 /* Reget the lock. */
135 cmpxchgl %edx, (%ebp)
137 cmpxchgl %edx, MUTEX(%ebp)
141 13: subl $1, READERS_QUEUED(%ebp)
142 cmpl $-ETIMEDOUT, %ecx
145 18: movl $ETIMEDOUT, %ecx
150 addl $1, NR_READERS(%ebp)
173 leal MUTEX(%ebp), %ecx
175 call __lll_mutex_lock_wait
178 14: cmpl %gs:TID, %eax
187 leal MUTEX(%ebp), %eax
189 call __lll_mutex_unlock_wake
193 8: subl $1, NR_READERS(%ebp)
198 4: subl $1, READERS_QUEUED(%ebp)
206 leal MUTEX(%ebp), %eax
208 call __lll_mutex_unlock_wake
215 leal MUTEX(%ebp), %ecx
217 call __lll_mutex_lock_wait
220 16: movl $-ETIMEDOUT, %ecx
223 19: movl $EINVAL, %ecx
225 .size pthread_rwlock_timedrdlock,.-pthread_rwlock_timedrdlock