src/lib/platform/windows/os-threads.cpp

   1 /*
   2  * This file is part of the libCEC(R) library.
   3  *
   4  * libCEC(R) is Copyright (C) 2011-2012 Pulse-Eight Limited.  All rights reserved.
   5  * libCEC(R) is an original work, containing original code.
   6  *
   7  * libCEC(R) is a trademark of Pulse-Eight Limited.
   8  *
   9  * This program is dual-licensed; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  22  *
  23  *
  24  * Alternatively, you can license this library under a commercial license,
  25  * please contact Pulse-Eight Licensing for more information.
  26  *
  27  * For more information contact:
  28  * Pulse-Eight Licensing       <license@pulse-eight.com>
  29  *     http://www.pulse-eight.com/
  30  *     http://www.pulse-eight.net/
  31  */
  32
  33 #include "env.h"
  34 #include "os-threads.h"
  35 using namespace PLATFORM;
  36
  37 static ConditionArg                     g_InitializeConditionVariable;
  38 static ConditionArg                     g_WakeConditionVariable;
  39 static ConditionArg                     g_WakeAllConditionVariable;
  40 static ConditionMutexArg                g_SleepConditionVariableCS;
  41
  42 // check whether vista+ conditions are available at runtime
  43 static bool CheckVistaConditionFunctions(void)
  44 {
  45   static int iHasVistaConditionFunctions(-1);
  46   if (iHasVistaConditionFunctions == -1)
  47   {
  48     HMODULE handle = GetModuleHandle("Kernel32");
  49     if (handle == NULL)
  50     {
  51       iHasVistaConditionFunctions = 0;
  52     }
  53     else
  54     {
  55       g_InitializeConditionVariable = (ConditionArg)     GetProcAddress(handle,"InitializeConditionVariable");
  56       g_WakeConditionVariable       = (ConditionArg)     GetProcAddress(handle,"WakeConditionVariable");
  57       g_WakeAllConditionVariable    = (ConditionArg)     GetProcAddress(handle,"WakeAllConditionVariable");
  58       g_SleepConditionVariableCS    = (ConditionMutexArg)GetProcAddress(handle,"SleepConditionVariableCS");
  59
  60       // 1 when everything is resolved, 0 otherwise
  61       iHasVistaConditionFunctions = g_InitializeConditionVariable &&
  62                                     g_WakeConditionVariable &&
  63                                     g_WakeAllConditionVariable &&
  64                                     g_SleepConditionVariableCS ? 1 : 0;
  65     }
  66   }
  67   return iHasVistaConditionFunctions == 1;
  68 }
  69
  70 CConditionImpl::CConditionImpl(void)
  71 {
  72   m_bOnVista = CheckVistaConditionFunctions();
  73   if (m_bOnVista)
  74     (*g_InitializeConditionVariable)(m_conditionVista = new CONDITION_VARIABLE);
  75   else
  76     m_conditionPreVista = ::CreateEvent(NULL, TRUE, FALSE, NULL);
  77 }
  78
  79 CConditionImpl::~CConditionImpl(void)
  80 {
  81   if (m_bOnVista)
  82     delete m_conditionVista;
  83   else
  84     ::CloseHandle(m_conditionPreVista);
  85 }
  86
  87 void CConditionImpl::Signal(void)
  88 {
  89   if (m_bOnVista)
  90     (*g_WakeConditionVariable)(m_conditionVista);
  91   else
  92     ::SetEvent(m_conditionPreVista);
  93 }
  94
  95 void CConditionImpl::Broadcast(void)
  96 {
  97   if (m_bOnVista)
  98     (*g_WakeAllConditionVariable)(m_conditionVista);
  99   else
 100     ::SetEvent(m_conditionPreVista);
 101 }
 102
 103 bool CConditionImpl::Wait(mutex_t &mutex)
 104 {
 105   if (m_bOnVista)
 106   {
 107     return ((*g_SleepConditionVariableCS)(m_conditionVista, mutex, INFINITE) ? true : false);
 108   }
 109   else
 110   {
 111     ::ResetEvent(m_conditionPreVista);
 112     MutexUnlock(mutex);
 113     DWORD iWaitReturn = ::WaitForSingleObject(m_conditionPreVista, 1000);
 114     MutexLock(mutex);
 115     return (iWaitReturn == 0);
 116   }
 117 }
 118
 119 bool CConditionImpl::Wait(mutex_t &mutex, uint32_t iTimeoutMs)
 120 {
 121   if (iTimeoutMs == 0)
 122     return Wait(mutex);
 123
 124   if (m_bOnVista)
 125   {
 126     return ((*g_SleepConditionVariableCS)(m_conditionVista, mutex, iTimeoutMs) ? true : false);
 127   }
 128   else
 129   {
 130     ::ResetEvent(m_conditionPreVista);
 131     MutexUnlock(mutex);
 132     DWORD iWaitReturn = ::WaitForSingleObject(m_conditionPreVista, iTimeoutMs);
 133     MutexLock(mutex);
 134     return (iWaitReturn == 0);
 135   }
 136 }