1 /* Copyright (C) 2002-2014 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, see
17 <http://www.gnu.org/licenses/>. */
20 #include <lowlevellock.h>
21 #include <lowlevelrwlock.h>
22 #include <pthread-errnos.h>
23 #include <kernel-features.h>
27 .globl pthread_rwlock_timedrdlock
28 .type pthread_rwlock_timedrdlock,@function
30 pthread_rwlock_timedrdlock:
33 cfi_adjust_cfa_offset(8)
34 cfi_rel_offset(%r12, 0)
36 cfi_adjust_cfa_offset(8)
37 cfi_rel_offset(%r13, 0)
38 #ifdef __ASSUME_FUTEX_CLOCK_REALTIME
42 cfi_adjust_cfa_offset(8)
43 cfi_rel_offset(%r14, 0)
46 cfi_adjust_cfa_offset(16)
60 cmpxchgl %esi, MUTEX(%rdi)
64 2: movl WRITER(%r12), %eax
67 cmpl $0, WRITERS_QUEUED(%r12)
72 /* Check the value of the timeout parameter. */
73 3: cmpq $1000000000, 8(%r13)
76 incl READERS_QUEUED(%r12)
79 movl READERS_WAKEUP(%r12), VALREG
91 #ifndef __ASSUME_FUTEX_CLOCK_REALTIME
93 cmpl $0, __have_futex_clock_realtime(%rip)
95 cmpl $0, __have_futex_clock_realtime
101 js 16f /* Time is already up. */
103 movl $FUTEX_PRIVATE_FLAG|FUTEX_WAIT_BITSET|FUTEX_CLOCK_REALTIME, %esi
104 xorl PSHARED(%r12), %esi
106 movl $0xffffffff, %r9d
107 #ifndef __ASSUME_FUTEX_CLOCK_REALTIME
110 21: leaq READERS_WAKEUP(%r12), %rdi
111 movl $SYS_futex, %eax
115 #ifndef __ASSUME_FUTEX_CLOCK_REALTIME
118 /* Get current time. */
121 /* This call works because we directly jump to a system call entry
122 which preserves all the registers. */
123 call JUMPTARGET(__gettimeofday)
125 /* Compute relative timeout. */
128 mul %rdi /* Milli seconds to nano seconds. */
134 addq $1000000000, %rdi
137 js 16f /* Time is already up. */
140 movq %rcx, (%rsp) /* Store relative timeout. */
143 # ifdef __ASSUME_PRIVATE_FUTEX
144 movl $FUTEX_PRIVATE_FLAG|FUTEX_WAIT, %esi
145 xorl PSHARED(%r12), %esi
148 movl PSHARED(%r12), %esi
150 movl $FUTEX_WAIT, %esi
151 orl PSHARED(%r12), %esi
153 xorl %fs:PRIVATE_FUTEX, %esi
162 17: /* Reget the lock. */
167 cmpxchgl %esi, (%r12)
169 cmpxchgl %esi, MUTEX(%r12)
173 13: decl READERS_QUEUED(%r12)
174 cmpq $-ETIMEDOUT, %rdx
177 18: movl $ETIMEDOUT, %edx
182 incl NR_READERS(%r12)
194 #ifndef __ASSUME_FUTEX_CLOCK_REALTIME
196 cfi_adjust_cfa_offset(-16)
198 cfi_adjust_cfa_offset(-8)
202 cfi_adjust_cfa_offset(-8)
205 cfi_adjust_cfa_offset(-8)
209 #ifdef __ASSUME_PRIVATE_FUTEX
210 cfi_adjust_cfa_offset(16)
211 cfi_rel_offset(%r12, 8)
212 cfi_rel_offset(%r13, 0)
214 cfi_adjust_cfa_offset(40)
215 cfi_offset(%r12, -16)
216 cfi_offset(%r13, -24)
217 cfi_offset(%r14, -32)
219 1: movl PSHARED(%rdi), %esi
223 callq __lll_lock_wait
226 14: cmpl %fs:TID, %eax
231 6: movl PSHARED(%r12), %esi
235 leal MUTEX(%r12), %rdi
237 callq __lll_unlock_wake
241 8: decl NR_READERS(%r12)
246 4: decl READERS_QUEUED(%r12)
250 10: movl PSHARED(%r12), %esi
254 leaq MUTEX(%r12), %rdi
256 callq __lll_unlock_wake
259 12: movl PSHARED(%r12), %esi
263 leaq MUTEX(%r12), %rdi
265 callq __lll_lock_wait
268 16: movq $-ETIMEDOUT, %rdx
271 19: movl $EINVAL, %edx
274 .size pthread_rwlock_timedrdlock,.-pthread_rwlock_timedrdlock