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author"Steven J. Hill" <sjhill@realitydiluted.com>2005-05-07 02:04:55 +0000
committer"Steven J. Hill" <sjhill@realitydiluted.com>2005-05-07 02:04:55 +0000
commit0b3366f6a93ac0f7e2028745ea557c0acd8722c6 (patch)
tree2a87cb353c106eb55a44437d3b4d5e0d60af1d36 /libpthread/nptl/pthread_rwlock_trywrlock.c
parent2274f6b2ddc7d7ea919a8fa1f9c54ef1920cb180 (diff)
Import in NPTL code from glibc. For further information please
consult the 'README.NPTL' file.
Diffstat (limited to 'libpthread/nptl/pthread_rwlock_trywrlock.c')
-rw-r--r--libpthread/nptl/pthread_rwlock_trywrlock.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/libpthread/nptl/pthread_rwlock_trywrlock.c b/libpthread/nptl/pthread_rwlock_trywrlock.c
new file mode 100644
index 000000000..b754a1956
--- /dev/null
+++ b/libpthread/nptl/pthread_rwlock_trywrlock.c
@@ -0,0 +1,43 @@
+/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
+
+ 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 "pthreadP.h"
+#include <lowlevellock.h>
+
+
+int
+__pthread_rwlock_trywrlock (rwlock)
+ pthread_rwlock_t *rwlock;
+{
+ int result = EBUSY;
+
+ lll_mutex_lock (rwlock->__data.__lock);
+
+ if (rwlock->__data.__writer == 0 && rwlock->__data.__nr_readers == 0)
+ {
+ rwlock->__data.__writer = THREAD_GETMEM (THREAD_SELF, tid);
+ result = 0;
+ }
+
+ lll_mutex_unlock (rwlock->__data.__lock);
+
+ return result;
+}
+strong_alias (__pthread_rwlock_trywrlock, pthread_rwlock_trywrlock)