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diff --git a/cancel_testcancel.c b/cancel_testcancel.c
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+/*
+ * cancel_testcancel.c
+ *
+ * Description:
+ * POSIX thread functions related to thread cancellation.
+ *
+ * --------------------------------------------------------------------------
+ *
+ *      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"
+
+
+void
+pthread_testcancel (void)
+     /*
+      * ------------------------------------------------------
+      * DOCPUBLIC
+      *      This function creates a deferred cancellation point
+      *      in the calling thread. The call has no effect if the
+      *      current cancelability state is
+      *              PTHREAD_CANCEL_DISABLE
+      *
+      * PARAMETERS
+      *      N/A
+      *
+      *
+      * DESCRIPTION
+      *      This function creates a deferred cancellation point
+      *      in the calling thread. The call has no effect if the
+      *      current cancelability state is
+      *              PTHREAD_CANCEL_DISABLE
+      *
+      *      NOTES:
+      *      1)      Cancellation is asynchronous. Use pthread_join
+      *              to wait for termination of thread if necessary
+      *
+      * RESULTS
+      *              N/A
+      *
+      * ------------------------------------------------------
+      */
+{
+  pthread_t self = pthread_self();
+
+  (void) pthread_mutex_lock(&self->cancelLock);
+
+  if (self != NULL
+      && self->cancelState != PTHREAD_CANCEL_DISABLE
+      && WaitForSingleObject (self->cancelEvent, 0) == WAIT_OBJECT_0
+      )
+    {
+      /*
+       * Canceling!
+       */
+      self->state = PThreadStateCanceling;
+      self->cancelState = PTHREAD_CANCEL_DISABLE;
+      (void) pthread_mutex_unlock(&self->cancelLock);
+      ptw32_throw(PTW32_EPS_CANCEL);
+    }
+
+  (void) pthread_mutex_unlock(&self->cancelLock);
+}                               /* pthread_testcancel */
+