/*
* Copyright ( c ) 2018 , 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 "semaphore_windows.hpp"
#include "utilities/debug.hpp"
#include <windows.h>
#include <errno.h>
WindowsSemaphore::WindowsSemaphore(uint value) {
_semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL);
guarantee(_semaphore != NULL, "CreateSemaphore failed with error code: %lu" , GetLastError());
}
WindowsSemaphore::~WindowsSemaphore() {
::CloseHandle(_semaphore);
}
void WindowsSemaphore::signal(uint count) {
if (count > 0 ) {
BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL);
assert(ret != 0 , "ReleaseSemaphore failed with error code: %lu" , GetLastError());
}
}
void WindowsSemaphore::wait() {
DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE);
assert(ret != WAIT_FAILED, "WaitForSingleObject failed with error code: %lu" , GetLastError());
assert(ret == WAIT_OBJECT_0, "WaitForSingleObject failed with return value: %lu" , ret);
}
bool WindowsSemaphore::trywait() {
DWORD ret = ::WaitForSingleObject(_semaphore, 0 );
assert(ret != WAIT_FAILED, "WaitForSingleObject failed with error code: %lu" , GetLastError());
return ret == WAIT_OBJECT_0;
}
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