diff options
Diffstat (limited to 'libpthread/sysdeps/generic/pt-rwlock-timedrdlock.c')
| -rw-r--r-- | libpthread/sysdeps/generic/pt-rwlock-timedrdlock.c | 113 |
1 files changed, 0 insertions, 113 deletions
diff --git a/libpthread/sysdeps/generic/pt-rwlock-timedrdlock.c b/libpthread/sysdeps/generic/pt-rwlock-timedrdlock.c deleted file mode 100644 index ba610fa5..00000000 --- a/libpthread/sysdeps/generic/pt-rwlock-timedrdlock.c +++ /dev/null @@ -1,113 +0,0 @@ -/* Acquire a rwlock for reading. Generic version. - Copyright (C) 2002, 2005 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Library General Public License as - published by the Free Software Foundation; either version 2 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 - Library General Public License for more details. - - You should have received a copy of the GNU Library General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -#include <pthread.h> -#include <assert.h> - -#include <pt-internal.h> - -/* Acquire the rwlock *RWLOCK for reading blocking until *ABSTIME if - it is already held. As a GNU extension, if TIMESPEC is NULL then - wait forever. */ -int -__pthread_rwlock_timedrdlock_internal (struct __pthread_rwlock *rwlock, - const struct timespec *abstime) -{ - struct __pthread *self; - - __pthread_spin_lock (&rwlock->__lock); - if (__pthread_spin_trylock (&rwlock->__held) == 0) - /* Successfully acquired the lock. */ - { - assert (rwlock->readerqueue == 0); - assert (rwlock->writerqueue == 0); - assert (rwlock->readers == 0); - - rwlock->readers = 1; - __pthread_spin_unlock (&rwlock->__lock); - return 0; - } - else - /* Lock is held, but is held by a reader? */ - if (rwlock->readers > 0) - /* Just add ourself to number of readers. */ - { - assert (rwlock->readerqueue == 0); - rwlock->readers ++; - __pthread_spin_unlock (&rwlock->__lock); - return 0; - } - - /* The lock is busy. */ - - /* Better be blocked by a writer. */ - assert (rwlock->readers == 0); - - if (abstime && (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000)) - return EINVAL; - - self = _pthread_self (); - - /* Add ourself to the queue. */ - __pthread_enqueue (&rwlock->readerqueue, self); - __pthread_spin_unlock (&rwlock->__lock); - - /* Block the thread. */ - if (abstime) - { - error_t err; - - err = __pthread_timedblock (self, abstime); - if (err) - /* We timed out. We may need to disconnect ourself from the - waiter queue. - - FIXME: What do we do if we get a wakeup message before we - disconnect ourself? It may remain until the next time we - block. */ - { - assert (err == ETIMEDOUT); - - __pthread_spin_lock (&rwlock->__lock); - if (self->prevp) - /* Disconnect ourself. */ - __pthread_dequeue (self); - __pthread_spin_unlock (&rwlock->__lock); - - return err; - } - } - else - __pthread_block (self); - - - /* The reader count has already been increment by whoever woke us - up. */ - - assert (rwlock->readers > 0); - - return 0; -} - -int -pthread_rwlock_timedrdlock (struct __pthread_rwlock *rwlock, - const struct timespec *abstime) -{ - return __pthread_rwlock_timedrdlock_internal (rwlock, abstime); -} |