1 /* Copyright (C) 2002, 2003 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>
24 #define SYS_gettimeofday __NR_gettimeofday
43 .globl pthread_rwlock_timedrdlock
44 .type pthread_rwlock_timedrdlock,@function
46 pthread_rwlock_timedrdlock:
62 xaddl %eax, MUTEX(%ebp)
67 2: movl WRITER(%ebp), %eax
70 cmp $0, WRITERS_QUEUED(%ebp)
75 /* Check the value of the timeout parameter. */
76 3: cmpl $1000000000, 4(%edi)
79 incl READERS_QUEUED(%ebp)
90 /* Get current time. */
93 movl $SYS_gettimeofday, %eax
96 /* Compute relative timeout. */
99 mul %edx /* Milli seconds to nano seconds. */
105 addl $1000000000, %edx
108 js 16f /* Time is already up. */
111 movl %ecx, (%esp) /* Store relative timeout. */
113 xorl %ecx, %ecx /* movl $FUTEX_WAIT, %ecx */
116 leal READERS_WAKEUP(%ebp), %ebx
117 movl $SYS_futex, %eax
122 /* Reget the lock. */
128 xaddl %eax, MUTEX(%ebp)
133 13: cmpl $-ETIMEDOUT, %ecx
135 decl READERS_QUEUED(%ebp)
137 movl $0, READERS_WAKEUP(%ebp)
142 incl NR_READERS(%ebp)
162 call __lll_mutex_lock_wait
171 call __lll_mutex_unlock_wake
175 8: decl NR_READERS(%ebp)
180 4: decl READERS_QUEUED(%ebp)
185 call __lll_mutex_unlock_wake
189 call __lll_mutex_lock_wait
192 16: movl $-ETIMEDOUT, %ecx
195 18: movl $ETIMEDOUT, %ecx
198 19: movl $EINVAL, %ecx
200 .size pthread_rwlock_timedrdlock,.-pthread_rwlock_timedrdlock