1 /* Copyright (C) 2002-2005, 2007, 2009, 2010 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 <lowlevellock.h>
22 #include <lowlevelrwlock.h>
23 #include <pthread-errnos.h>
24 #include <kernel-features.h>
27 /* For the calculation see asm/vsyscall.h. */
28 #define VSYSCALL_ADDR_vgettimeofday 0xffffffffff600000
32 .globl pthread_rwlock_timedrdlock
33 .type pthread_rwlock_timedrdlock,@function
35 pthread_rwlock_timedrdlock:
38 cfi_adjust_cfa_offset(8)
39 cfi_rel_offset(%r12, 0)
41 cfi_adjust_cfa_offset(8)
42 cfi_rel_offset(%r13, 0)
43 #ifdef __ASSUME_FUTEX_CLOCK_REALTIME
47 cfi_adjust_cfa_offset(8)
48 cfi_rel_offset(%r14, 0)
51 cfi_adjust_cfa_offset(16)
65 cmpxchgl %esi, MUTEX(%rdi)
69 2: movl WRITER(%r12), %eax
72 cmpl $0, WRITERS_QUEUED(%r12)
77 /* Check the value of the timeout parameter. */
78 3: cmpq $1000000000, 8(%r13)
81 incl READERS_QUEUED(%r12)
84 movl READERS_WAKEUP(%r12), VALREG
96 #ifndef __ASSUME_FUTEX_CLOCK_REALTIME
98 cmpl $0, __have_futex_clock_realtime(%rip)
100 cmpl $0, __have_futex_clock_realtime
106 js 16f /* Time is already up. */
108 movl $FUTEX_PRIVATE_FLAG|FUTEX_WAIT_BITSET|FUTEX_CLOCK_REALTIME, %esi
109 xorl PSHARED(%r12), %esi
111 movl $0xffffffff, %r9d
112 #ifndef __ASSUME_FUTEX_CLOCK_REALTIME
115 21: leaq READERS_WAKEUP(%r12), %rdi
116 movl $SYS_futex, %eax
120 #ifndef __ASSUME_FUTEX_CLOCK_REALTIME
123 /* Get current time. */
126 movq $VSYSCALL_ADDR_vgettimeofday, %rax
129 /* Compute relative timeout. */
132 mul %rdi /* Milli seconds to nano seconds. */
138 addq $1000000000, %rdi
141 js 16f /* Time is already up. */
144 movq %rcx, (%rsp) /* Store relative timeout. */
147 # ifdef __ASSUME_PRIVATE_FUTEX
148 movl $FUTEX_PRIVATE_FLAG|FUTEX_WAIT, %esi
149 xorl PSHARED(%r12), %esi
152 movl PSHARED(%r12), %esi
154 movl $FUTEX_WAIT, %esi
155 orl PSHARED(%r12), %esi
157 xorl %fs:PRIVATE_FUTEX, %esi
166 17: /* Reget the lock. */
171 cmpxchgl %esi, (%r12)
173 cmpxchgl %esi, MUTEX(%r12)
177 13: decl READERS_QUEUED(%r12)
178 cmpq $-ETIMEDOUT, %rdx
181 18: movl $ETIMEDOUT, %edx
186 incl NR_READERS(%r12)
198 #ifndef __ASSUME_FUTEX_CLOCK_REALTIME
200 cfi_adjust_cfa_offset(-16)
202 cfi_adjust_cfa_offset(-8)
206 cfi_adjust_cfa_offset(-8)
209 cfi_adjust_cfa_offset(-8)
213 #ifdef __ASSUME_PRIVATE_FUTEX
214 cfi_adjust_cfa_offset(16)
215 cfi_rel_offset(%r12, 8)
216 cfi_rel_offset(%r13, 0)
218 cfi_adjust_cfa_offset(40)
219 cfi_offset(%r12, -16)
220 cfi_offset(%r13, -24)
221 cfi_offset(%r14, -32)
223 1: movl PSHARED(%rdi), %esi
227 callq __lll_lock_wait
230 14: cmpl %fs:TID, %eax
235 6: movl PSHARED(%r12), %esi
239 leal MUTEX(%r12), %rdi
241 callq __lll_unlock_wake
245 8: decl NR_READERS(%r12)
250 4: decl READERS_QUEUED(%r12)
254 10: movl PSHARED(%r12), %esi
258 leaq MUTEX(%r12), %rdi
260 callq __lll_unlock_wake
263 12: movl PSHARED(%r12), %esi
267 leaq MUTEX(%r12), %rdi
269 callq __lll_lock_wait
272 16: movq $-ETIMEDOUT, %rdx
275 19: movl $EINVAL, %edx
278 .size pthread_rwlock_timedrdlock,.-pthread_rwlock_timedrdlock