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/*
* Copyright (c) 2010, 2022, 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.
*
*/
#ifndef OS_WINDOWS_PARK_WINDOWS_HPP
#define OS_WINDOWS_PARK_WINDOWS_HPP
#include "memory/allocation.hpp"
#include "utilities/debug.hpp"
#include "utilities/globalDefinitions.hpp"
class PlatformEvent : public CHeapObj<mtSynchronizer> {
private:
double CachePad [4] ; // increase odds that _Event is sole occupant of cache line
volatile int _Event ;
HANDLE _ParkHandle ;
public: // TODO-FIXME: make dtor private
~PlatformEvent() { guarantee (0, "invariant") ; }
public:
PlatformEvent() {
_Event = 0 ;
_ParkHandle = CreateEvent (NULL, false, false, NULL) ;
guarantee (_ParkHandle != NULL, "invariant") ;
}
// Exercise caution using reset() and fired() - they may require MEMBARs
void reset() { _Event = 0 ; }
int fired() { return _Event; }
void park () ;
void unpark () ;
int park (jlong millis) ;
};
class PlatformParker {
NONCOPYABLE(PlatformParker);
protected:
HANDLE _ParkHandle;
public:
PlatformParker() {
_ParkHandle = CreateEvent (NULL, true, false, NULL) ;
guarantee(_ParkHandle != NULL, "invariant") ;
}
~PlatformParker() {
CloseHandle(_ParkHandle);
}
};
#endif // OS_WINDOWS_PARK_WINDOWS_HPP
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