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authorJakub Jelinek <jakub@redhat.com>2007-07-31 13:33:18 +0000
committerJakub Jelinek <jakub@redhat.com>2007-07-31 13:33:18 +0000
commit32c075e1f01849e161724bbd400ba77244e482cc (patch)
tree5f083a3f352104f32bb6c902d57fa3f294bd8d4d /nptl/pthread_rwlock_timedwrlock.c
parentd6220e9ee38c1c9285221b023346201ec5f511b3 (diff)
.
Diffstat (limited to 'nptl/pthread_rwlock_timedwrlock.c')
-rw-r--r--nptl/pthread_rwlock_timedwrlock.c127
1 files changed, 0 insertions, 127 deletions
diff --git a/nptl/pthread_rwlock_timedwrlock.c b/nptl/pthread_rwlock_timedwrlock.c
deleted file mode 100644
index 97c0598f96..0000000000
--- a/nptl/pthread_rwlock_timedwrlock.c
+++ /dev/null
@@ -1,127 +0,0 @@
-/* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Martin Schwidefsky <schwidefsky@de.ibm.com>, 2003.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
-
-#include <errno.h>
-#include <sysdep.h>
-#include <lowlevellock.h>
-#include <pthread.h>
-#include <pthreadP.h>
-
-
-/* Try to acquire write lock for RWLOCK or return after specfied time. */
-int
-pthread_rwlock_timedwrlock (rwlock, abstime)
- pthread_rwlock_t *rwlock;
- const struct timespec *abstime;
-{
- int result = 0;
-
- /* Make sure we are along. */
- lll_mutex_lock (rwlock->__data.__lock);
-
- while (1)
- {
- int err;
-
- /* Get the rwlock if there is no writer and no reader. */
- if (rwlock->__data.__writer == 0 && rwlock->__data.__nr_readers == 0)
- {
- /* Mark self as writer. */
- rwlock->__data.__writer = THREAD_GETMEM (THREAD_SELF, tid);
- break;
- }
-
- /* Make sure we are not holding the rwlock as a writer. This is
- a deadlock situation we recognize and report. */
- if (__builtin_expect (rwlock->__data.__writer
- == THREAD_GETMEM (THREAD_SELF, tid), 0))
- {
- result = EDEADLK;
- break;
- }
-
- /* Make sure the passed in timeout value is valid. Ideally this
- test would be executed once. But since it must not be
- performed if we would not block at all simply moving the test
- to the front is no option. Replicating all the code is
- costly while this test is not. */
- if (__builtin_expect (abstime->tv_nsec >= 1000000000
- || abstime->tv_nsec < 0, 0))
- {
- result = EINVAL;
- break;
- }
-
- /* Get the current time. So far we support only one clock. */
- struct timeval tv;
- (void) gettimeofday (&tv, NULL);
-
- /* Convert the absolute timeout value to a relative timeout. */
- struct timespec rt;
- rt.tv_sec = abstime->tv_sec - tv.tv_sec;
- rt.tv_nsec = abstime->tv_nsec - tv.tv_usec * 1000;
- if (rt.tv_nsec < 0)
- {
- rt.tv_nsec += 1000000000;
- --rt.tv_sec;
- }
- /* Did we already time out? */
- if (rt.tv_sec < 0)
- {
- result = ETIMEDOUT;
- break;
- }
-
- /* Remember that we are a writer. */
- if (++rwlock->__data.__nr_writers_queued == 0)
- {
- /* Overflow on number of queued writers. */
- --rwlock->__data.__nr_writers_queued;
- result = EAGAIN;
- break;
- }
-
- int waitval = rwlock->__data.__writer_wakeup;
-
- /* Free the lock. */
- lll_mutex_unlock (rwlock->__data.__lock);
-
- /* Wait for the writer or reader(s) to finish. */
- err = lll_futex_timed_wait (&rwlock->__data.__writer_wakeup,
- waitval, &rt);
-
- /* Get the lock. */
- lll_mutex_lock (rwlock->__data.__lock);
-
- /* To start over again, remove the thread from the writer list. */
- --rwlock->__data.__nr_writers_queued;
-
- /* Did the futex call time out? */
- if (err == -ETIMEDOUT)
- {
- result = ETIMEDOUT;
- break;
- }
- }
-
- /* We are done, free the lock. */
- lll_mutex_unlock (rwlock->__data.__lock);
-
- return result;
-}