1 files changed, 231 insertions, 0 deletions
diff --git a/mozilla/nsprpub/pr/src/threads/prmon.c b/mozilla/nsprpub/pr/src/threads/prmon.c
new file mode 100644
index 0000000..dc8a32c
--- /dev/null
+++ b/mozilla/nsprpub/pr/src/threads/prmon.c
@@ -0,0 +1,231 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** 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 "primpl.h"
+
+/************************************************************************/
+
+/*
+** Create a new monitor.
+*/
+PR_IMPLEMENT(PRMonitor*) PR_NewMonitor()
+{
+    PRMonitor *mon;
+	PRCondVar *cvar;
+	PRLock *lock;
+
+    mon = PR_NEWZAP(PRMonitor);
+    if (mon) {
+		lock = PR_NewLock();
+	    if (!lock) {
+			PR_DELETE(mon);
+			return 0;
+    	}
+
+	    cvar = PR_NewCondVar(lock);
+	    if (!cvar) {
+	    	PR_DestroyLock(lock);
+			PR_DELETE(mon);
+			return 0;
+    	}
+    	mon->cvar = cvar;
+	mon->name = NULL;
+    }
+    return mon;
+}
+
+PR_IMPLEMENT(PRMonitor*) PR_NewNamedMonitor(const char* name)
+{
+    PRMonitor* mon = PR_NewMonitor();
+    if (mon)
+        mon->name = name;
+    return mon;
+}
+
+/*
+** Destroy a monitor. There must be no thread waiting on the monitor's
+** condition variable. The caller is responsible for guaranteeing that the
+** monitor is no longer in use.
+*/
+PR_IMPLEMENT(void) PR_DestroyMonitor(PRMonitor *mon)
+{
+	PR_DestroyLock(mon->cvar->lock);
+    PR_DestroyCondVar(mon->cvar);
+    PR_DELETE(mon);
+}
+
+/*
+** Enter the lock associated with the monitor.
+*/
+PR_IMPLEMENT(void) PR_EnterMonitor(PRMonitor *mon)
+{
+    if (mon->cvar->lock->owner == _PR_MD_CURRENT_THREAD()) {
+		mon->entryCount++;
+    } else {
+		PR_Lock(mon->cvar->lock);
+		mon->entryCount = 1;
+    }
+}
+
+/*
+** Test and then enter the lock associated with the monitor if it's not
+** already entered by some other thread. Return PR_FALSE if some other
+** thread owned the lock at the time of the call.
+*/
+PR_IMPLEMENT(PRBool) PR_TestAndEnterMonitor(PRMonitor *mon)
+{
+    if (mon->cvar->lock->owner == _PR_MD_CURRENT_THREAD()) {
+		mon->entryCount++;
+		return PR_TRUE;
+    } else {
+		if (PR_TestAndLock(mon->cvar->lock)) {
+	    	mon->entryCount = 1;
+	   	 	return PR_TRUE;
+		}
+    }
+    return PR_FALSE;
+}
+
+/*
+** Exit the lock associated with the monitor once.
+*/
+PR_IMPLEMENT(PRStatus) PR_ExitMonitor(PRMonitor *mon)
+{
+    if (mon->cvar->lock->owner != _PR_MD_CURRENT_THREAD()) {
+        return PR_FAILURE;
+    }
+    if (--mon->entryCount == 0) {
+		return PR_Unlock(mon->cvar->lock);
+    }
+    return PR_SUCCESS;
+}
+
+/*
+** Return the number of times that the current thread has entered the
+** lock. Returns zero if the current thread has not entered the lock.
+*/
+PR_IMPLEMENT(PRIntn) PR_GetMonitorEntryCount(PRMonitor *mon)
+{
+    return (mon->cvar->lock->owner == _PR_MD_CURRENT_THREAD()) ?
+        mon->entryCount : 0;
+}
+
+/*
+** If the current thread is in |mon|, this assertion is guaranteed to
+** succeed.  Otherwise, the behavior of this function is undefined.
+*/
+PR_IMPLEMENT(void) PR_AssertCurrentThreadInMonitor(PRMonitor *mon)
+{
+    PR_ASSERT_CURRENT_THREAD_OWNS_LOCK(mon->cvar->lock);
+}
+
+/*
+** Wait for a notify on the condition variable. Sleep for "ticks" amount
+** of time (if "tick" is 0 then the sleep is indefinite). While
+** the thread is waiting it exits the monitors lock (as if it called
+** PR_ExitMonitor as many times as it had called PR_EnterMonitor).  When
+** the wait has finished the thread regains control of the monitors lock
+** with the same entry count as before the wait began.
+**
+** The thread waiting on the monitor will be resumed when the monitor is
+** notified (assuming the thread is the next in line to receive the
+** notify) or when the "ticks" elapses.
+**
+** Returns PR_FAILURE if the caller has not locked the lock associated
+** with the condition variable.
+** This routine can return PR_PENDING_INTERRUPT if the waiting thread 
+** has been interrupted.
+*/
+PR_IMPLEMENT(PRStatus) PR_Wait(PRMonitor *mon, PRIntervalTime ticks)
+{
+    PRUintn entryCount;
+	PRStatus status;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+
+    if (mon->cvar->lock->owner != me) return PR_FAILURE;
+
+    entryCount = mon->entryCount;
+    mon->entryCount = 0;
+
+	status = _PR_WaitCondVar(me, mon->cvar, mon->cvar->lock, ticks);
+
+    mon->entryCount = entryCount;
+
+    return status;
+}
+
+/*
+** Notify the highest priority thread waiting on the condition
+** variable. If a thread is waiting on the condition variable (using
+** PR_Wait) then it is awakened and begins waiting on the monitor's lock.
+*/
+PR_IMPLEMENT(PRStatus) PR_Notify(PRMonitor *mon)
+{
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+    if (mon->cvar->lock->owner != me) return PR_FAILURE;
+    PR_NotifyCondVar(mon->cvar);
+    return PR_SUCCESS;
+}
+
+/*
+** Notify all of the threads waiting on the condition variable. All of
+** threads are notified in turn. The highest priority thread will
+** probably acquire the monitor first when the monitor is exited.
+*/
+PR_IMPLEMENT(PRStatus) PR_NotifyAll(PRMonitor *mon)
+{
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+    if (mon->cvar->lock->owner != me) return PR_FAILURE;
+    PR_NotifyAllCondVar(mon->cvar);
+    return PR_SUCCESS;
+}
+
+/************************************************************************/
+
+PRUint32 _PR_MonitorToString(PRMonitor *mon, char *buf, PRUint32 buflen)
+{
+    PRUint32 nb;
+
+    if (mon->cvar->lock->owner) {
+	nb = PR_snprintf(buf, buflen, "[%p] owner=%d[%p] count=%ld",
+			 mon, mon->cvar->lock->owner->id,
+			 mon->cvar->lock->owner, mon->entryCount);
+    } else {
+	nb = PR_snprintf(buf, buflen, "[%p]", mon);
+    }
+    return nb;
+}