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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_mutex_trylock.c
parent2274f6b2ddc7d7ea919a8fa1f9c54ef1920cb180 (diff)
Import in NPTL code from glibc. For further information please
consult the 'README.NPTL' file.
Diffstat (limited to 'libpthread/nptl/pthread_mutex_trylock.c')
-rw-r--r--libpthread/nptl/pthread_mutex_trylock.c77
1 files changed, 77 insertions, 0 deletions
diff --git a/libpthread/nptl/pthread_mutex_trylock.c b/libpthread/nptl/pthread_mutex_trylock.c
new file mode 100644
index 000000000..7008af3d9
--- /dev/null
+++ b/libpthread/nptl/pthread_mutex_trylock.c
@@ -0,0 +1,77 @@
+/* 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_mutex_trylock (mutex)
+ pthread_mutex_t *mutex;
+{
+ pid_t id;
+
+ switch (__builtin_expect (mutex->__data.__kind, PTHREAD_MUTEX_TIMED_NP))
+ {
+ /* Recursive mutex. */
+ case PTHREAD_MUTEX_RECURSIVE_NP:
+ id = THREAD_GETMEM (THREAD_SELF, tid);
+ /* Check whether we already hold the mutex. */
+ if (mutex->__data.__owner == id)
+ {
+ /* Just bump the counter. */
+ if (__builtin_expect (mutex->__data.__count + 1 == 0, 0))
+ /* Overflow of the counter. */
+ return EAGAIN;
+
+ ++mutex->__data.__count;
+ return 0;
+ }
+
+ if (lll_mutex_trylock (mutex->__data.__lock) == 0)
+ {
+ /* Record the ownership. */
+ mutex->__data.__owner = id;
+ mutex->__data.__count = 1;
+ ++mutex->__data.__nusers;
+ return 0;
+ }
+ break;
+
+ case PTHREAD_MUTEX_ERRORCHECK_NP:
+ /* Error checking mutex. We do not check for deadlocks. */
+ default:
+ /* Correct code cannot set any other type. */
+ case PTHREAD_MUTEX_TIMED_NP:
+ case PTHREAD_MUTEX_ADAPTIVE_NP:
+ /* Normal mutex. */
+ if (lll_mutex_trylock (mutex->__data.__lock) == 0)
+ {
+ /* Record the ownership. */
+ mutex->__data.__owner = THREAD_GETMEM (THREAD_SELF, tid);
+ ++mutex->__data.__nusers;
+
+ return 0;
+ }
+ }
+
+ return EBUSY;
+}
+strong_alias (__pthread_mutex_trylock, pthread_mutex_trylock)