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-rw-r--r--pthreads/pthread_mutex_destroy.c146
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+/*
+ * pthread_mutex_destroy.c
+ *
+ * Description:
+ * This translation unit implements mutual exclusion (mutex) primitives.
+ *
+ * --------------------------------------------------------------------------
+ *
+ * Pthreads-win32 - POSIX Threads Library for Win32
+ * Copyright(C) 1998 John E. Bossom
+ * Copyright(C) 1999,2005 Pthreads-win32 contributors
+ *
+ * Contact Email: rpj@callisto.canberra.edu.au
+ *
+ * The current list of contributors is contained
+ * in the file CONTRIBUTORS included with the source
+ * code distribution. The list can also be seen at the
+ * following World Wide Web location:
+ * http://sources.redhat.com/pthreads-win32/contributors.html
+ *
+ * This 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 of the License, or (at your option) any later version.
+ *
+ * This 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 this library in 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 "implement.h"
+
+
+int
+pthread_mutex_destroy (pthread_mutex_t * mutex)
+{
+ int result = 0;
+ pthread_mutex_t mx;
+
+ /*
+ * Let the system deal with invalid pointers.
+ */
+
+ /*
+ * Check to see if we have something to delete.
+ */
+ if (*mutex < PTHREAD_ERRORCHECK_MUTEX_INITIALIZER)
+ {
+ mx = *mutex;
+
+ result = pthread_mutex_trylock (&mx);
+
+ /*
+ * If trylock succeeded and the mutex is not recursively locked it
+ * can be destroyed.
+ */
+ if (result == 0)
+ {
+ if (mx->kind != PTHREAD_MUTEX_RECURSIVE || 1 == mx->recursive_count)
+ {
+ /*
+ * FIXME!!!
+ * The mutex isn't held by another thread but we could still
+ * be too late invalidating the mutex below since another thread
+ * may already have entered mutex_lock and the check for a valid
+ * *mutex != NULL.
+ *
+ * Note that this would be an unusual situation because it is not
+ * common that mutexes are destroyed while they are still in
+ * use by other threads.
+ */
+ *mutex = NULL;
+
+ result = pthread_mutex_unlock (&mx);
+
+ if (result == 0)
+ {
+ if (!CloseHandle (mx->event))
+ {
+ *mutex = mx;
+ result = EINVAL;
+ }
+ else
+ {
+ free (mx);
+ }
+ }
+ else
+ {
+ /*
+ * Restore the mutex before we return the error.
+ */
+ *mutex = mx;
+ }
+ }
+ else /* mx->recursive_count > 1 */
+ {
+ /*
+ * The mutex must be recursive and already locked by us (this thread).
+ */
+ mx->recursive_count--; /* Undo effect of pthread_mutex_trylock() above */
+ result = EBUSY;
+ }
+ }
+ }
+ else
+ {
+ /*
+ * See notes in ptw32_mutex_check_need_init() above also.
+ */
+ EnterCriticalSection (&ptw32_mutex_test_init_lock);
+
+ /*
+ * Check again.
+ */
+ if (*mutex >= PTHREAD_ERRORCHECK_MUTEX_INITIALIZER)
+ {
+ /*
+ * This is all we need to do to destroy a statically
+ * initialised mutex that has not yet been used (initialised).
+ * If we get to here, another thread
+ * waiting to initialise this mutex will get an EINVAL.
+ */
+ *mutex = NULL;
+ }
+ else
+ {
+ /*
+ * The mutex has been initialised while we were waiting
+ * so assume it's in use.
+ */
+ result = EBUSY;
+ }
+
+ LeaveCriticalSection (&ptw32_mutex_test_init_lock);
+ }
+
+ return (result);
+}