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

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

Index: third_party/nspr/mozilla/nsprpub/pr/src/bthreads/btsem.c
diff --git a/third_party/nspr/mozilla/nsprpub/pr/src/bthreads/btsem.c b/third_party/nspr/mozilla/nsprpub/pr/src/bthreads/btsem.c
new file mode 100644
index 0000000000000000000000000000000000000000..bce28142bcabc441dd06e4c4c85d198b590f2303
--- /dev/null
+++ b/third_party/nspr/mozilla/nsprpub/pr/src/bthreads/btsem.c
@@ -0,0 +1,130 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; 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 ***** */
+
+#include <kernel/OS.h>
+
+#include "primpl.h"
+
+/*
+** Create a new semaphore object.
+*/
+PR_IMPLEMENT(PRSemaphore*)
+    PR_NewSem (PRUintn value)
+{
+	PRSemaphore *semaphore;
+
+	if (!_pr_initialized) _PR_ImplicitInitialization();
+
+	semaphore = PR_NEWZAP(PRSemaphore);
+	if (NULL != semaphore) {
+		if ((semaphore->sem = create_sem(value, "nspr_sem")) < B_NO_ERROR)
+			return NULL;
+		else 
+			return semaphore;
+	}
+	return NULL;
+}
+
+/*
+** Destroy the given semaphore object.
+**
+*/
+PR_IMPLEMENT(void)
+    PR_DestroySem (PRSemaphore *sem)
+{
+	status_t result;
+
+	PR_ASSERT(sem != NULL);
+	result = delete_sem(sem->sem);
+	PR_ASSERT(result == B_NO_ERROR);
+	PR_DELETE(sem);
+} 
+
+/*
+** Wait on a Semaphore.
+** 
+** This routine allows a calling thread to wait or proceed depending upon
+** the state of the semahore sem. The thread can proceed only if the
+** counter value of the semaphore sem is currently greater than 0. If the
+** value of semaphore sem is positive, it is decremented by one and the
+** routine returns immediately allowing the calling thread to continue. If
+** the value of semaphore sem is 0, the calling thread blocks awaiting the
+** semaphore to be released by another thread.
+** 
+** This routine can return PR_PENDING_INTERRUPT if the waiting thread 
+** has been interrupted.
+*/
+PR_IMPLEMENT(PRStatus)
+    PR_WaitSem (PRSemaphore *sem)
+{
+	PR_ASSERT(sem != NULL);
+	if (acquire_sem(sem->sem) == B_NO_ERROR)
+		return PR_SUCCESS;
+	else
+		return PR_FAILURE;
+}
+
+/*
+** This routine increments the counter value of the semaphore. If other
+** threads are blocked for the semaphore, then the scheduler will
+** determine which ONE thread will be unblocked.
+*/
+PR_IMPLEMENT(void)
+    PR_PostSem (PRSemaphore *sem)
+{
+	status_t result;
+
+	PR_ASSERT(sem != NULL);
+	result = release_sem_etc(sem->sem, 1, B_DO_NOT_RESCHEDULE);
+	PR_ASSERT(result == B_NO_ERROR);
+}
+
+/*
+** Returns the value of the semaphore referenced by sem without affecting
+** the state of the semaphore.  The value represents the semaphore value
+** at the time of the call, but may not be the actual value when the
+** caller inspects it.
+*/
+PR_IMPLEMENT(PRUintn)
+    PR_GetValueSem (PRSemaphore *sem)
+{
+	sem_info	info;
+
+	PR_ASSERT(sem != NULL);
+	get_sem_info(sem->sem, &info);
+	return info.count;
+}