3 Copyright (C) 2013 sapier, < sapier AT gmx DOT net >
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU Lesser General Public License as published by
7 the Free Software Foundation; either version 2.1 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19 #include "jthread/jsemaphore.h"
21 JSemaphore::JSemaphore() {
22 m_hSemaphore = CreateSemaphore(
29 JSemaphore::~JSemaphore() {
30 CloseHandle(m_hSemaphore);
33 JSemaphore::JSemaphore(int initval) {
34 m_hSemaphore = CreateSemaphore(
41 void JSemaphore::Post() {
48 void JSemaphore::Wait() {
54 bool JSemaphore::Wait(unsigned int time_ms) {
55 unsigned int retval = WaitForSingleObject(
59 if (retval == WAIT_OBJECT_0)
64 assert(retval == WAIT_TIMEOUT);
69 typedef LONG (NTAPI *_NtQuerySemaphore)(
70 HANDLE SemaphoreHandle,
71 DWORD SemaphoreInformationClass,
72 PVOID SemaphoreInformation,
73 ULONG SemaphoreInformationLength,
74 PULONG ReturnLength OPTIONAL
77 typedef struct _SEMAPHORE_BASIC_INFORMATION {
80 } SEMAPHORE_BASIC_INFORMATION;
82 /* Note: this will only work as long as jthread is directly linked to application */
83 /* it's gonna fail if someone tries to build jthread as dll */
84 static _NtQuerySemaphore NtQuerySemaphore =
87 (GetModuleHandle ("ntdll.dll"), "NtQuerySemaphore");
89 int JSemaphore::GetValue() {
90 SEMAPHORE_BASIC_INFORMATION BasicInfo;
93 assert(NtQuerySemaphore);
95 retval = NtQuerySemaphore (m_hSemaphore, 0,
96 &BasicInfo, sizeof (SEMAPHORE_BASIC_INFORMATION), NULL);
98 if (retval == ERROR_SUCCESS)
100 return BasicInfo.CurrentCount;
103 assert("unable to read semaphore count" == 0);