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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* 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 */
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