fbafef11c0
Make MutexLocker be MutexLockerEx implementation, remove MutexLockerEx calls. Reviewed-by: dcubed, dholmes, pliden, rehn
72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
/*
|
|
* Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
|
|
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
|
*
|
|
* This code is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 only, as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This code is distributed in the hope that it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
* version 2 for more details (a copy is included in the LICENSE file that
|
|
* accompanied this code).
|
|
*
|
|
* You should have received a copy of the GNU General Public License version
|
|
* 2 along with this work; if not, write to the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
|
|
* or visit www.oracle.com if you need additional information or have any
|
|
* questions.
|
|
*/
|
|
|
|
#include "precompiled.hpp"
|
|
#include "gc/z/zMetronome.hpp"
|
|
#include "runtime/mutexLocker.hpp"
|
|
#include "runtime/timer.hpp"
|
|
#include "utilities/ticks.hpp"
|
|
|
|
ZMetronome::ZMetronome(uint64_t hz) :
|
|
_monitor(Monitor::leaf, "ZMetronome", false, Monitor::_safepoint_check_never),
|
|
_interval_ms(MILLIUNITS / hz),
|
|
_start_ms(0),
|
|
_nticks(0),
|
|
_stopped(false) {}
|
|
|
|
uint64_t ZMetronome::nticks() const {
|
|
return _nticks;
|
|
}
|
|
|
|
bool ZMetronome::wait_for_tick() {
|
|
if (_nticks++ == 0) {
|
|
// First tick, set start time
|
|
const Ticks now = Ticks::now();
|
|
_start_ms = TimeHelper::counter_to_millis(now.value());
|
|
}
|
|
|
|
for (;;) {
|
|
// We might wake up spuriously from wait, so always recalculate
|
|
// the timeout after a wakeup to see if we need to wait again.
|
|
const Ticks now = Ticks::now();
|
|
const uint64_t now_ms = TimeHelper::counter_to_millis(now.value());
|
|
const uint64_t next_ms = _start_ms + (_interval_ms * _nticks);
|
|
const int64_t timeout_ms = next_ms - now_ms;
|
|
|
|
MonitorLocker ml(&_monitor, Monitor::_no_safepoint_check_flag);
|
|
if (!_stopped && timeout_ms > 0) {
|
|
// Wait
|
|
ml.wait(timeout_ms);
|
|
} else {
|
|
// Tick
|
|
return !_stopped;
|
|
}
|
|
}
|
|
}
|
|
|
|
void ZMetronome::stop() {
|
|
MonitorLocker ml(&_monitor, Monitor::_no_safepoint_check_flag);
|
|
_stopped = true;
|
|
ml.notify();
|
|
}
|