1 /* Copyright (C) 2002, 2003, 2004 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>
29 /* For the calculation see asm/vsyscall.h. */
30 #define VSYSCALL_ADDR_vgettimeofday 0xffffffffff600000
42 .globl pthread_rwlock_timedrdlock
43 .type pthread_rwlock_timedrdlock,@function
45 pthread_rwlock_timedrdlock:
61 cmpxchgl %esi, MUTEX(%rdi)
65 2: movl WRITER(%r12), %eax
68 cmpl $0, WRITERS_QUEUED(%r12)
73 /* Check the value of the timeout parameter. */
74 3: cmpq $1000000000, 8(%r13)
77 incl READERS_QUEUED(%r12)
80 movl READERS_WAKEUP(%r12), %r14d
91 /* Get current time. */
94 movq $VSYSCALL_ADDR_vgettimeofday, %rax
97 /* Compute relative timeout. */
100 mul %rdi /* Milli seconds to nano seconds. */
106 addq $1000000000, %rdi
109 js 16f /* Time is already up. */
112 movq %rcx, (%rsp) /* Store relative timeout. */
115 xorq %rsi, %rsi /* movq $FUTEX_WAIT, %rsi */
118 leaq READERS_WAKEUP(%r12), %rdi
119 movq $SYS_futex, %rax
124 /* Reget the lock. */
129 cmpxchgl %esi, (%r12)
131 cmpxchgl %esi, MUTEX(%r12)
135 13: decl READERS_QUEUED(%r12)
136 cmpq $-ETIMEDOUT, %rdx
139 18: movq $ETIMEDOUT, %rdx
144 incl NR_READERS(%r12)
166 callq __lll_mutex_lock_wait
169 14: cmpl %fs:TID, %eax
178 leal MUTEX(%r12), %rdi
180 callq __lll_mutex_unlock_wake
184 8: decl NR_READERS(%r12)
189 4: decl READERS_QUEUED(%r12)
197 leaq MUTEX(%r12), %rdi
199 callq __lll_mutex_unlock_wake
206 leaq MUTEX(%r12), %rdi
208 callq __lll_mutex_lock_wait
211 16: movq $-ETIMEDOUT, %rdx
214 19: movq $EINVAL, %rdx
216 .size pthread_rwlock_timedrdlock,.-pthread_rwlock_timedrdlock