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+/*
+ * pthread_mutex_trylock.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_trylock (pthread_mutex_t * mutex)
+{
+ int result = 0;
+ pthread_mutex_t mx;
+
+ /*
+ * Let the system deal with invalid pointers.
+ */
+
+ /*
+ * We do a quick check to see if we need to do more work
+ * to initialise a static mutex. We check
+ * again inside the guarded section of ptw32_mutex_check_need_init()
+ * to avoid race conditions.
+ */
+ if (*mutex >= PTHREAD_ERRORCHECK_MUTEX_INITIALIZER)
+ {
+ if ((result = ptw32_mutex_check_need_init (mutex)) != 0)
+ {
+ return (result);
+ }
+ }
+
+ mx = *mutex;
+
+ if (0 == (LONG) PTW32_INTERLOCKED_COMPARE_EXCHANGE (
+ (PTW32_INTERLOCKED_LPLONG) &mx->lock_idx,
+ (PTW32_INTERLOCKED_LONG) 1,
+ (PTW32_INTERLOCKED_LONG) 0))
+ {
+ if (mx->kind != PTHREAD_MUTEX_NORMAL)
+ {
+ mx->recursive_count = 1;
+ mx->ownerThread = pthread_self ();
+ }
+ }
+ else
+ {
+ if (mx->kind == PTHREAD_MUTEX_RECURSIVE &&
+ pthread_equal (mx->ownerThread, pthread_self ()))
+ {
+ mx->recursive_count++;
+ }
+ else
+ {
+ result = EBUSY;
+ }
+ }
+
+ return (result);
+}