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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'js/ipc/CPOWTimer.h')
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diff --git a/js/ipc/CPOWTimer.h b/js/ipc/CPOWTimer.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=4 sw=4 et 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 CPOWTIMER_H
+#define CPOWTIMER_H
+
+#include "prinrval.h"
+#include "jsapi.h"
+
+/**
+ * A stopwatch measuring the duration of a CPOW call.
+ *
+ * As the process is consuming neither user time nor system time
+ * during a CPOW call, we measure such durations using wallclock time.
+ *
+ * This stopwatch is active iff JSRuntime::stopwatch.isActive is set.
+ * Upon destruction, update JSRuntime::stopwatch.data.totalCPOWTime.
+ */
+class MOZ_RAII CPOWTimer final {
+ public:
+ explicit inline CPOWTimer(JSContext* cx MOZ_GUARD_OBJECT_NOTIFIER_PARAM);
+ ~CPOWTimer();
+
+ private:
+ MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
+
+ /**
+ * The context in which this timer was created, or `nullptr` if
+ * CPOW monitoring was off when the timer was created.
+ */
+ JSContext* cx_;
+
+ /**
+ * The instant at which the stopwatch was started. Undefined
+ * if CPOW monitoring was off when the timer was created.
+ */
+ int64_t startInterval_;
+};
+
+#endif