Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 72 insertions, 0 deletions

diff --git a/js/src/vm/Monitor.h b/js/src/vm/Monitor.h
new file mode 100644
index 0000000000..6c0fbff0d9
--- /dev/null
+++ b/js/src/vm/Monitor.h
@@ -0,0 +1,72 @@
+/* -*- 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 */