1 /* Copyright (C) 2003, 2007, 2008 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
19 #include <lowlevellock.h>
20 #include <lowlevelrwlock.h>
21 #include <pthread-errnos.h>
22 #include <tcb-offsets.h>
23 #include <bits/kernel-features.h>
24 #include "lowlevel-atomic.h"
29 .globl pthread_rwlock_timedrdlock
30 .type pthread_rwlock_timedrdlock,@function
32 pthread_rwlock_timedrdlock:
46 CMPXCHG (r3, @r8, r4, r2)
48 CMPXCHG (r3, @(MUTEX,r8), r4, r2)
52 mov.l @(WRITER,r8), r0
55 mov.l @(WRITERS_QUEUED,r8), r0
63 /* Check the value of the timeout parameter. */
69 mov.l @(READERS_QUEUED,r8), r0
71 mov.l r0, @(READERS_QUEUED,r8)
75 mov.l @(READERS_WAKEUP,r8), r10
86 /* Get current time. */
89 mov #__NR_gettimeofday, r3
95 dmulu.l r0, r1 /* Milli seconds to nano seconds. */
109 bf 16f /* Time is already up. */
111 /* Store relative timeout. */
117 #ifdef __ASSUME_PRIVATE_FUTEX
120 mov #(FUTEX_PRIVATE_FLAG|FUTEX_WAIT), r0
139 add #READERS_WAKEUP, r4
147 /* Reget the lock. */
151 CMPXCHG (r5, @r8, r4, r2)
153 CMPXCHG (r5, @(MUTEX,r8), r4, r2)
158 mov.l @(READERS_QUEUED,r8), r0
160 mov.l r0, @(READERS_QUEUED,r8)
171 mov.l @(NR_READERS,r8), r0
173 mov.l r0, @(NR_READERS,r8)
181 DEC (@(MUTEX,r8), r2)
195 #ifndef __ASSUME_PRIVATE_FUTEX
197 .word PRIVATE_FUTEX - TLS_PRE_TCB_SIZE
226 /* Deadlock detected. */
231 .word TID - TLS_PRE_TCB_SIZE
251 mov.l @(NR_READERS,r8), r1
253 mov.l r1, @(NR_READERS,r8)
259 mov.l @(READERS_QUEUED,r8), r1
261 mov.l r1, @(READERS_QUEUED,r8)
306 .long __lll_lock_wait-.Lwait2b
308 .long __lll_unlock_wake-.Lwake2b
310 .long __lll_lock_wait-.Lwait3b
312 .long __lll_unlock_wake-.Lwake3b
313 .size pthread_rwlock_timedrdlock,.-pthread_rwlock_timedrdlock