Major reorganisation of source code; new routine and tests added.

1 files changed, 99 insertions, 0 deletions

diff --git a/pthread_mutex_trylock.c b/pthread_mutex_trylock.c
new file mode 100644
index 0000000..66eb96e
--- /dev/null
+++ b/pthread_mutex_trylock.c
@@ -0,0 +1,99 @@
+/*
+ * 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) 1999,2002 Pthreads-win32 contributors
+ * 
+ *      Contact Email: rpj@ise.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;
+
+  if (mutex == NULL || *mutex == NULL)
+    {
+      return EINVAL;
+    }
+
+  /*
+   * 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_MUTEX_INITIALIZER)
+    {
+      result = ptw32_mutex_check_need_init(mutex);
+    }
+
+  mx = *mutex;
+
+  if (result == 0)
+    {
+      if ( (PTW32_INTERLOCKED_LONG) PTW32_MUTEX_LOCK_IDX_INIT ==
+	   ptw32_interlocked_compare_exchange((PTW32_INTERLOCKED_LPLONG) &mx->lock_idx,
+					      (PTW32_INTERLOCKED_LONG) 0,
+					      (PTW32_INTERLOCKED_LONG) PTW32_MUTEX_LOCK_IDX_INIT))
+	{
+	  mx->recursive_count = 1;
+	  mx->ownerThread = (mx->kind != PTHREAD_MUTEX_FAST_NP
+			     ? pthread_self()
+			     : (pthread_t) PTW32_MUTEX_OWNER_ANONYMOUS);
+	}
+      else
+	{
+	  if( mx->kind != PTHREAD_MUTEX_FAST_NP &&
+	      pthread_equal( mx->ownerThread, pthread_self() ) )
+	    {
+	      if( mx->kind == PTHREAD_MUTEX_RECURSIVE_NP )
+		{
+		  mx->recursive_count++;
+		}
+	      else
+		{
+		  result = EDEADLK;
+		}
+	    }
+	  else
+	    {
+	      result = EBUSY;
+	    }
+	}
+    }
+
+  return(result);
+}