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diff --git a/tests/rwlock4_t.c b/tests/rwlock4_t.c
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+/* 
+ * rwlock4_t.c
+ *
+ *
+ * --------------------------------------------------------------------------
+ *
+ * --------------------------------------------------------------------------
+ *
+ *	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
+ *
+ * --------------------------------------------------------------------------
+ *
+ * Declare a static rwlock object, timed-rdlock it, trywrlock it, 
+ * and then unlock it again.
+ *
+ * Depends on API functions: 
+ *	pthread_rwlock_timedrdlock()
+ *	pthread_rwlock_trywrlock()
+ *	pthread_rwlock_unlock()
+ */
+
+#include "test.h"
+#include <sys/timeb.h>
+
+pthread_rwlock_t rwlock1 = PTHREAD_RWLOCK_INITIALIZER;
+
+static int washere = 0;
+
+void * func(void * arg)
+{
+  assert(pthread_rwlock_trywrlock(&rwlock1) == EBUSY);
+
+  washere = 1;
+
+  return 0; 
+}
+ 
+int
+main()
+{
+  pthread_t t;
+  struct timespec abstime = { 0, 0 };
+  struct _timeb currSysTime;
+  const DWORD NANOSEC_PER_MILLISEC = 1000000;
+
+  _ftime(&currSysTime);
+
+  abstime.tv_sec = currSysTime.time;
+  abstime.tv_nsec = NANOSEC_PER_MILLISEC * currSysTime.millitm;
+
+  abstime.tv_sec += 1;
+
+  assert(pthread_rwlock_timedrdlock(&rwlock1, &abstime) == 0);
+
+  assert(pthread_create(&t, NULL, func, NULL) == 0);
+
+  Sleep(2000);
+
+  assert(pthread_rwlock_unlock(&rwlock1) == 0);
+
+  assert(washere == 1);
+
+  return 0;
+}