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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* 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 "threading/ConditionVariable.h"
#include "threading/Mutex.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_ MOZ_UNANNOTATED;
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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