Initial commit of upstream NSPR (4.7.3) and NSS3 (3.12).

third_party/nspr/mozilla/nsprpub/pr/src/bthreads/btlocks.c

Index: third_party/nspr/mozilla/nsprpub/pr/src/bthreads/btlocks.c
diff --git a/third_party/nspr/mozilla/nsprpub/pr/src/bthreads/btlocks.c b/third_party/nspr/mozilla/nsprpub/pr/src/bthreads/btlocks.c
new file mode 100644
index 0000000000000000000000000000000000000000..bf8bfd474bdf563e6d50f975eea19be1a8d2c009
--- /dev/null
+++ b/third_party/nspr/mozilla/nsprpub/pr/src/bthreads/btlocks.c
@@ -0,0 +1,116 @@
+/* -*- Mode: C++; c-basic-offset: 4 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * 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 Portable Runtime (NSPR).
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998-2000
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+/*
+** File:        btlocks.c
+** Description: Implemenation for thread locks using bthreads
+** Exports:     prlock.h
+*/
+
+#include "primpl.h"
+
+#include <string.h>
+#include <sys/time.h>
+
+void
+_PR_InitLocks (void)
+{
+}
+
+PR_IMPLEMENT(PRLock*)
+    PR_NewLock (void)
+{
+    PRLock *lock;
+    status_t semresult;
+
+    if (!_pr_initialized) _PR_ImplicitInitialization();
+
+    lock = PR_NEWZAP(PRLock);
+    if (lock != NULL) {
+
+	lock->benaphoreCount = 0;
+	lock->semaphoreID = create_sem( 0, "nsprLockSem" );
+	if( lock->semaphoreID < B_NO_ERROR ) {
+
+	    PR_DELETE( lock );
+	    lock = NULL;
+	}
+    }
+
+    return lock;
+}
+
+PR_IMPLEMENT(void)
+    PR_DestroyLock (PRLock* lock)
+{
+    status_t result;
+
+    PR_ASSERT(NULL != lock);
+    result = delete_sem(lock->semaphoreID);
+    PR_ASSERT(result == B_NO_ERROR);
+    PR_DELETE(lock);
+}
+
+PR_IMPLEMENT(void)
+    PR_Lock (PRLock* lock)
+{
+    PR_ASSERT(lock != NULL);
+
+    if( atomic_add( &lock->benaphoreCount, 1 ) > 0 ) {
+
+	if( acquire_sem(lock->semaphoreID ) != B_NO_ERROR ) {
+
+	    atomic_add( &lock->benaphoreCount, -1 );
+	    return;
+	}
+    }
+
+    lock->owner = find_thread( NULL );
+}
+
+PR_IMPLEMENT(PRStatus)
+    PR_Unlock (PRLock* lock)
+{
+    PR_ASSERT(lock != NULL);
+    lock->owner = NULL;
+    if( atomic_add( &lock->benaphoreCount, -1 ) > 1 ) {
+
+	release_sem_etc( lock->semaphoreID, 1, B_DO_NOT_RESCHEDULE );
+    }
+
+    return PR_SUCCESS;
+}