mirror of https://github.com/minetest/minetest.git
105 lines
2.4 KiB
C++
105 lines
2.4 KiB
C++
/*
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Minetest
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Copyright (C) 2013 sapier, < sapier AT gmx DOT net >
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "jthread/jsemaphore.h"
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JSemaphore::JSemaphore() {
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m_hSemaphore = CreateSemaphore(
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0,
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0,
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MAX_SEMAPHORE_COUNT,
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0);
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}
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JSemaphore::~JSemaphore() {
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CloseHandle(m_hSemaphore);
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}
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JSemaphore::JSemaphore(int initval) {
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m_hSemaphore = CreateSemaphore(
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0,
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initval,
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MAX_SEMAPHORE_COUNT,
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0);
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}
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void JSemaphore::Post() {
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ReleaseSemaphore(
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m_hSemaphore,
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1,
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0);
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}
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void JSemaphore::Wait() {
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WaitForSingleObject(
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m_hSemaphore,
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INFINITE);
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}
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bool JSemaphore::Wait(unsigned int time_ms) {
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unsigned int retval = WaitForSingleObject(
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m_hSemaphore,
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time_ms);
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if (retval == WAIT_OBJECT_0)
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{
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return true;
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}
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else {
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assert(retval == WAIT_TIMEOUT);
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return false;
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}
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}
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typedef LONG (NTAPI *_NtQuerySemaphore)(
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HANDLE SemaphoreHandle,
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DWORD SemaphoreInformationClass,
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PVOID SemaphoreInformation,
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ULONG SemaphoreInformationLength,
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PULONG ReturnLength OPTIONAL
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);
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typedef struct _SEMAPHORE_BASIC_INFORMATION {
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ULONG CurrentCount;
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ULONG MaximumCount;
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} SEMAPHORE_BASIC_INFORMATION;
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/* Note: this will only work as long as jthread is directly linked to application */
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/* it's gonna fail if someone tries to build jthread as dll */
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static _NtQuerySemaphore NtQuerySemaphore =
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(_NtQuerySemaphore)
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GetProcAddress
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(GetModuleHandle ("ntdll.dll"), "NtQuerySemaphore");
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int JSemaphore::GetValue() {
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SEMAPHORE_BASIC_INFORMATION BasicInfo;
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LONG retval;
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assert(NtQuerySemaphore);
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retval = NtQuerySemaphore (m_hSemaphore, 0,
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&BasicInfo, sizeof (SEMAPHORE_BASIC_INFORMATION), NULL);
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if (retval == ERROR_SUCCESS)
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return BasicInfo.CurrentCount;
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assert("unable to read semaphore count" == 0);
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return 0;
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}
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