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author | Ulrich Drepper <drepper@redhat.com> | 2006-10-28 05:15:26 +0000 |
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committer | Ulrich Drepper <drepper@redhat.com> | 2006-10-28 05:15:26 +0000 |
commit | eb0a3d0cab507fecefe390a340f74ab8e5cf7831 (patch) | |
tree | c97ac1c33a78c454c0aeb520624af29c724355d2 /nptl/pthread_rwlock_rdlock.c | |
parent | 006a8f6f626e6e4d30b73c2ee20377b6a8cce1b7 (diff) | |
download | glibc-eb0a3d0cab507fecefe390a340f74ab8e5cf7831.zip glibc-eb0a3d0cab507fecefe390a340f74ab8e5cf7831.tar.gz glibc-eb0a3d0cab507fecefe390a340f74ab8e5cf7831.tar.bz2 |
* sysdeps/pthread/pthread_barrier_wait.c: Move to...
* pthread_barrier_wait.c: ...here.
* sysdeps/pthread/pthread_cond_broadcast.c: Move to...
* pthread_cond_broadcast.c: ...here.
* sysdeps/pthread/pthread_cond_signal.c: Move to...
* pthread_cond_signal.c: ...here.
* sysdeps/pthread/pthread_cond_timedwait.c: Move to...
* pthread_cond_timedwait.c: ...here.
* sysdeps/pthread/pthread_cond_wait.c: Move to...
* pthread_cond_wait.c: ...here.
* sysdeps/pthread/pthread_once.c: Move to...
* pthread_once.c: ...here.
* sysdeps/pthread/pthread_rwlock_rdlock.c: Move to...
* pthread_rwlock_rdlock.c: ...here.
* sysdeps/pthread/pthread_rwlock_timedrdlock.c: Move to...
* pthread_rwlock_timedrdlock.c: ...here.
* sysdeps/pthread/pthread_rwlock_timedwrlock.c: Move to...
* pthread_rwlock_timedwrlock.c: ...here.
* sysdeps/pthread/pthread_rwlock_unlock.c: Move to...
* pthread_rwlock_unlock.c: ...here.
* sysdeps/pthread/pthread_rwlock_wrlock.c: Move to...
* pthread_rwlock_wrlock.c: ...here.
* sysdeps/pthread/pthread_spin_destroy.c: Move to...
* pthread_spin_destroy.c: ...here.
* sysdeps/pthread/pthread_spin_init.c: Move to...
* pthread_spin_init.c: ...here.
* sysdeps/pthread/pthread_spin_unlock.c: Move to...
* pthread_spin_unlock.c: ...here.
* sysdeps/pthread/pthread_getcpuclockid.c: Move to...
* pthread_getcpuclockid.c: ...here.
Diffstat (limited to 'nptl/pthread_rwlock_rdlock.c')
-rw-r--r-- | nptl/pthread_rwlock_rdlock.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/nptl/pthread_rwlock_rdlock.c b/nptl/pthread_rwlock_rdlock.c new file mode 100644 index 0000000..e225d70 --- /dev/null +++ b/nptl/pthread_rwlock_rdlock.c @@ -0,0 +1,95 @@ +/* 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> + + +/* Acquire read lock for RWLOCK. */ +int +__pthread_rwlock_rdlock (rwlock) + pthread_rwlock_t *rwlock; +{ + int result = 0; + + /* Make sure we are along. */ + lll_mutex_lock (rwlock->__data.__lock); + + while (1) + { + /* Get the rwlock if there is no writer... */ + if (rwlock->__data.__writer == 0 + /* ...and if either no writer is waiting or we prefer readers. */ + && (!rwlock->__data.__nr_writers_queued + || rwlock->__data.__flags == 0)) + { + /* Increment the reader counter. Avoid overflow. */ + if (__builtin_expect (++rwlock->__data.__nr_readers == 0, 0)) + { + /* Overflow on number of readers. */ + --rwlock->__data.__nr_readers; + result = EAGAIN; + } + + 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; + } + + /* Remember that we are a reader. */ + if (__builtin_expect (++rwlock->__data.__nr_readers_queued == 0, 0)) + { + /* Overflow on number of queued readers. */ + --rwlock->__data.__nr_readers_queued; + result = EAGAIN; + break; + } + + int waitval = rwlock->__data.__readers_wakeup; + + /* Free the lock. */ + lll_mutex_unlock (rwlock->__data.__lock); + + /* Wait for the writer to finish. */ + lll_futex_wait (&rwlock->__data.__readers_wakeup, waitval); + + /* Get the lock. */ + lll_mutex_lock (rwlock->__data.__lock); + + --rwlock->__data.__nr_readers_queued; + } + + /* We are done, free the lock. */ + lll_mutex_unlock (rwlock->__data.__lock); + + return result; +} + +weak_alias (__pthread_rwlock_rdlock, pthread_rwlock_rdlock) +strong_alias (__pthread_rwlock_rdlock, __pthread_rwlock_rdlock_internal) |