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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /js/src/vm/Monitor.h
parentInitial commit. (diff)
downloadfirefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz
firefox-26a029d407be480d791972afb5975cf62c9360a6.zip
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'js/src/vm/Monitor.h')
-rw-r--r--js/src/vm/Monitor.h72
1 files changed, 72 insertions, 0 deletions
diff --git a/js/src/vm/Monitor.h b/js/src/vm/Monitor.h
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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 */