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Diffstat (limited to 'libpthread/nptl/pthread_mutex_unlock.c')
-rw-r--r--libpthread/nptl/pthread_mutex_unlock.c78
1 files changed, 78 insertions, 0 deletions
diff --git a/libpthread/nptl/pthread_mutex_unlock.c b/libpthread/nptl/pthread_mutex_unlock.c
new file mode 100644
index 000000000..32bc2a4bc
--- /dev/null
+++ b/libpthread/nptl/pthread_mutex_unlock.c
@@ -0,0 +1,78 @@
+/* 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
+internal_function attribute_hidden
+__pthread_mutex_unlock_usercnt (mutex, decr)
+ pthread_mutex_t *mutex;
+ int decr;
+{
+ switch (__builtin_expect (mutex->__data.__kind, PTHREAD_MUTEX_TIMED_NP))
+ {
+ case PTHREAD_MUTEX_RECURSIVE_NP:
+ /* Recursive mutex. */
+ if (mutex->__data.__owner != THREAD_GETMEM (THREAD_SELF, tid))
+ return EPERM;
+
+ if (--mutex->__data.__count != 0)
+ /* We still hold the mutex. */
+ return 0;
+ break;
+
+ case PTHREAD_MUTEX_ERRORCHECK_NP:
+ /* Error checking mutex. */
+ if (mutex->__data.__owner != THREAD_GETMEM (THREAD_SELF, tid)
+ || ! lll_mutex_islocked (mutex->__data.__lock))
+ return EPERM;
+ break;
+
+ default:
+ /* Correct code cannot set any other type. */
+ case PTHREAD_MUTEX_TIMED_NP:
+ case PTHREAD_MUTEX_ADAPTIVE_NP:
+ /* Normal mutex. Nothing special to do. */
+ break;
+ }
+
+ /* Always reset the owner field. */
+ mutex->__data.__owner = 0;
+ if (decr)
+ /* One less user. */
+ --mutex->__data.__nusers;
+
+ /* Unlock. */
+ lll_mutex_unlock (mutex->__data.__lock);
+
+ return 0;
+}
+
+
+int
+__pthread_mutex_unlock (mutex)
+ pthread_mutex_t *mutex;
+{
+ return __pthread_mutex_unlock_usercnt (mutex, 1);
+}
+strong_alias (__pthread_mutex_unlock, pthread_mutex_unlock)
+strong_alias (__pthread_mutex_unlock, __pthread_mutex_unlock_internal)