1 files changed, 105 insertions, 0 deletions
diff --git a/security/nss/lib/util/nsslocks.c b/security/nss/lib/util/nsslocks.c
new file mode 100644
index 000000000..ce9072c68
--- /dev/null
+++ b/security/nss/lib/util/nsslocks.c
@@ -0,0 +1,105 @@
+/*
+ * The contents of this file are subject to the Mozilla Public
+ * License Version 1.1 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.mozilla.org/MPL/
+ * 
+ * Software distributed under the License is distributed on an "AS
+ * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+ * implied. See the License for the specific language governing
+ * rights and limitations under the License.
+ * 
+ * The Original Code is the Netscape security libraries.
+ * 
+ * The Initial Developer of the Original Code is Netscape
+ * Communications Corporation.  Portions created by Netscape are 
+ * Copyright (C) 1994-2000 Netscape Communications Corporation.  All
+ * Rights Reserved.
+ * 
+ * Contributor(s):
+ * 
+ * Alternatively, the contents of this file may be used under the
+ * terms of the GNU General Public License Version 2 or later (the
+ * "GPL"), in which case the provisions of the GPL are applicable 
+ * instead of those above.  If you wish to allow use of your 
+ * version of this file only under the terms of the GPL and not to
+ * allow others to use your version of this file under the MPL,
+ * indicate your decision by deleting the provisions above and
+ * replace them with the notice and other provisions required by
+ * the GPL.  If you do not delete the provisions above, a recipient
+ * may use your version of this file under either the MPL or the
+ * GPL.
+ */
+
+/*
+ * nsslocks.h - threadsafe functions to initialize lock pointers.
+ *
+ * NOTE - These are not public interfaces
+ *
+ * $Id$
+ */
+
+#include "seccomon.h"
+#include "nsslocks.h"
+#include "pratom.h"
+#include "prthread.h"
+
+/* Given the address of a (global) pointer to a PZLock, 
+ * atomicly create the lock and initialize the (global) pointer, 
+ * if it is not already created/initialized.
+ */
+
+SECStatus 
+__nss_InitLock(   PZLock    **ppLock, nssILockType ltype )
+{
+    static PRInt32  initializers;
+
+    PORT_Assert( ppLock != NULL);
+
+    /* atomically initialize the lock */
+    while (!*ppLock) {
+        PRInt32 myAttempt = PR_AtomicIncrement(&initializers);
+        if (myAttempt == 1) {
+	    *ppLock = PZ_NewLock(ltype);
+            (void) PR_AtomicDecrement(&initializers);
+            break;
+        }
+        PR_Sleep(PR_INTERVAL_NO_WAIT);          /* PR_Yield() */
+        (void) PR_AtomicDecrement(&initializers);
+    }
+
+    return (*ppLock != NULL) ? SECSuccess : SECFailure;
+}
+
+SECStatus 
+nss_InitLock(   PZLock    **ppLock, nssILockType ltype )
+{
+    return __nss_InitLock(ppLock, ltype);
+}
+
+/* Given the address of a (global) pointer to a PZMonitor, 
+ * atomicly create the monitor and initialize the (global) pointer, 
+ * if it is not already created/initialized.
+ */
+
+SECStatus 
+nss_InitMonitor(PZMonitor **ppMonitor, nssILockType ltype )
+{
+    static PRInt32  initializers;
+
+    PORT_Assert( ppMonitor != NULL);
+
+    /* atomically initialize the lock */
+    while (!*ppMonitor) {
+        PRInt32 myAttempt = PR_AtomicIncrement(&initializers);
+        if (myAttempt == 1) {
+	    *ppMonitor = PZ_NewMonitor(ltype);
+            (void) PR_AtomicDecrement(&initializers);
+            break;
+        }
+        PR_Sleep(PR_INTERVAL_NO_WAIT);          /* PR_Yield() */
+        (void) PR_AtomicDecrement(&initializers);
+    }
+
+    return (*ppMonitor != NULL) ? SECSuccess : SECFailure;
+}