summaryrefslogtreecommitdiffstats
path: root/js/src/vm/Monitor.h
diff options
context:
space:
mode:
Diffstat (limited to 'js/src/vm/Monitor.h')
-rw-r--r--js/src/vm/Monitor.h102
1 files changed, 102 insertions, 0 deletions
diff --git a/js/src/vm/Monitor.h b/js/src/vm/Monitor.h
new file mode 100644
index 000000000..c5ce9b843
--- /dev/null
+++ b/js/src/vm/Monitor.h
@@ -0,0 +1,102 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * 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/. */
+
+#ifndef vm_Monitor_h
+#define vm_Monitor_h
+
+#include "mozilla/DebugOnly.h"
+
+#include <stddef.h>
+
+#include "js/Utility.h"
+
+namespace js {
+
+// A base class used for types intended to be used in a parallel
+// fashion. Combines a lock and a condition variable. You can
+// acquire the lock or signal the condition variable using the
+// |AutoLockMonitor| type.
+
+class Monitor
+{
+ protected:
+ friend class AutoLockMonitor;
+ friend class AutoUnlockMonitor;
+
+ Mutex lock_;
+ ConditionVariable condVar_;
+
+ public:
+ explicit Monitor(const MutexId& id)
+ : lock_(id)
+ { }
+};
+
+class AutoLockMonitor : public LockGuard<Mutex>
+{
+ private:
+ using Base = LockGuard<Mutex>;
+ Monitor& monitor;
+
+ public:
+ explicit AutoLockMonitor(Monitor& monitor)
+ : Base(monitor.lock_)
+ , monitor(monitor)
+ { }
+
+ bool isFor(Monitor& other) const {
+ return monitor.lock_ == other.lock_;
+ }
+
+ void wait(ConditionVariable& condVar) {
+ condVar.wait(*this);
+ }
+
+ void wait() {
+ wait(monitor.condVar_);
+ }
+
+ void notify(ConditionVariable& condVar) {
+ condVar.notify_one();
+ }
+
+ void notify() {
+ notify(monitor.condVar_);
+ }
+
+ void notifyAll(ConditionVariable& condVar) {
+ condVar.notify_all();
+ }
+
+ void notifyAll() {
+ notifyAll(monitor.condVar_);
+ }
+};
+
+class AutoUnlockMonitor
+{
+ private:
+ Monitor& monitor;
+
+ public:
+ explicit AutoUnlockMonitor(Monitor& monitor)
+ : monitor(monitor)
+ {
+ monitor.lock_.unlock();
+ }
+
+ ~AutoUnlockMonitor() {
+ monitor.lock_.lock();
+ }
+
+ bool isFor(Monitor& other) const {
+ return monitor.lock_ == other.lock_;
+ }
+};
+
+} // namespace js
+
+#endif /* vm_Monitor_h */