windows/JackWinMutex.h

   1 /*
   2  Copyright (C) 2004-2008 Grame
   3
   4  This program is free software; you can redistribute it and/or modify
   5  it under the terms of the GNU Lesser General Public License as published by
   6  the Free Software Foundation; either version 2.1 of the License, or
   7  (at your option) any later version.
   8
   9  This program is distributed in the hope that it will be useful,
  10  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  GNU Lesser General Public License for more details.
  13
  14  You should have received a copy of the GNU Lesser General Public License
  15  along with this program; if not, write to the Free Software
  16  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17
  18  */
  19
  20
  21 #ifndef __JackWinMutex__
  22 #define __JackWinMutex__
  23
  24 #include "JackError.h"
  25 #include "JackException.h"
  26 #include <windows.h>
  27
  28 namespace Jack
  29 {
  30 /*!
  31 \brief Mutex abstraction.
  32 */
  33 class JackBaseWinMutex
  34 {
  35
  36     protected:
  37
  38         HANDLE fMutex;
  39         DWORD fOwner;
  40
  41     public:
  42
  43         JackBaseWinMutex():fOwner(0)
  44         {
  45             // In recursive mode by default
  46             fMutex = (HANDLE)CreateMutex(0, FALSE, 0);
  47             ThrowIf(fMutex == 0, JackException("JackWinMutex: could not init the mutex"));
  48         }
  49
  50         virtual ~JackBaseWinMutex()
  51         {
  52             CloseHandle(fMutex);
  53         }
  54
  55         bool Lock()
  56         {
  57             if (fOwner != GetCurrentThreadId()) {
  58                 DWORD res = WaitForSingleObject(fMutex, INFINITE);
  59                 if (res == WAIT_OBJECT_0) {
  60                     fOwner = GetCurrentThreadId();
  61                     return true;
  62                 } else {
  63                     jack_log("JackWinMutex::Lock res = %d", res);
  64                     return false;
  65                 }
  66             } else {
  67                 jack_error("JackWinMutex::Lock mutex already locked by thread = %d", GetCurrentThreadId());
  68                 return false;
  69             }
  70         }
  71
  72         bool Trylock()
  73         {
  74             if (fOwner != GetCurrentThreadId()) {
  75                 DWORD res = WaitForSingleObject(fMutex, 0);
  76                 if (res == WAIT_OBJECT_0) {
  77                     fOwner = GetCurrentThreadId();
  78                     return true;
  79                 } else {
  80                     jack_log("JackWinMutex::Trylock res = %d", res);
  81                     return false;
  82                 }
  83             } else {
  84                 jack_error("JackWinMutex::Trylock mutex already locked by thread = %d", GetCurrentThreadId());
  85                 return false;
  86             }
  87         }
  88
  89         bool Unlock()
  90         {
  91             if (fOwner == GetCurrentThreadId()) {
  92                 fOwner = 0;
  93                 int res = ReleaseMutex(fMutex);
  94                 if (res != 0) {
  95                     return true;
  96                 } else {
  97                     jack_log("JackWinMutex::Unlock res = %d", res);
  98                     return false;
  99                 }
 100             } else {
 101                 jack_error("JackWinMutex::Unlock mutex not locked by thread = %d", GetCurrentThreadId());
 102                 return false;
 103             }
 104         }
 105
 106 };
 107
 108 class JackWinMutex
 109 {
 110
 111     protected:
 112
 113         HANDLE fMutex;
 114
 115     public:
 116
 117         JackWinMutex()
 118         {
 119             // In recursive mode by default
 120             fMutex = (HANDLE)CreateMutex(0, FALSE, 0);
 121         }
 122
 123         virtual ~JackWinMutex()
 124         {
 125             CloseHandle(fMutex);
 126         }
 127
 128         bool Lock()
 129         {
 130             return (WAIT_OBJECT_0 == WaitForSingleObject(fMutex, INFINITE));
 131         }
 132
 133         bool Trylock()
 134         {
 135             return (WAIT_OBJECT_0 == WaitForSingleObject(fMutex, 0));
 136         }
 137
 138         bool Unlock()
 139         {
 140             return(ReleaseMutex(fMutex) != 0);
 141         }
 142
 143 };
 144
 145
 146 } // namespace
 147
 148 #endif