diff -r 000000000000 -r 6474c204b198 nsprpub/pr/src/md/os2/os2sem.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nsprpub/pr/src/md/os2/os2sem.c	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,61 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * OS/2-specific semaphore handling code.
+ *
+ */
+
+#include "primpl.h"
+
+
+void
+_PR_MD_NEW_SEM(_MDSemaphore *md, PRUintn value)
+{
+   int rv;
+
+    /* Our Sems don't support a value > 1 */
+    PR_ASSERT(value <= 1);
+
+    rv = DosCreateEventSem(NULL, &md->sem, 0, 0);
+    PR_ASSERT(rv == NO_ERROR);
+}
+
+void
+_PR_MD_DESTROY_SEM(_MDSemaphore *md)
+{
+   int rv;
+   rv = DosCloseEventSem(md->sem);
+   PR_ASSERT(rv == NO_ERROR);
+
+}
+
+PRStatus
+_PR_MD_TIMED_WAIT_SEM(_MDSemaphore *md, PRIntervalTime ticks)
+{
+    int rv;
+    rv = DosWaitEventSem(md->sem, PR_IntervalToMilliseconds(ticks));
+
+    if (rv == NO_ERROR)
+        return PR_SUCCESS;
+    else
+        return PR_FAILURE;
+}
+
+PRStatus
+_PR_MD_WAIT_SEM(_MDSemaphore *md)
+{
+    return _PR_MD_TIMED_WAIT_SEM(md, PR_INTERVAL_NO_TIMEOUT);
+}
+
+void
+_PR_MD_POST_SEM(_MDSemaphore *md)
+{
+   int rv;
+   rv = DosPostEventSem(md->sem);
+   PR_ASSERT(rv == NO_ERROR); 
+}
+
+