sbtrd.cpp

OSB-PIK-OpenVXI-3.0.0源代码 “中国XML论坛 - 专业的XML技术讨论区--XML在语音技术中的应用”

 /****************License************************************************
  *
  * Copyright 2000-2003.  ScanSoft, Inc.    
  *
  * Use of this software is subject to notices and obligations set forth 
  * in the SpeechWorks Public License - Software Version 1.2 which is 
  * included with this software. 
  *
  * ScanSoft is a registered trademark of ScanSoft, Inc., and OpenSpeech, 
  * SpeechWorks and the SpeechWorks logo are registered trademarks or 
  * trademarks of SpeechWorks International, Inc. in the United States 
  * and other countries.
  *
  ***********************************************************************/
 

 
 /*****************************************************************************
  *****************************************************************************
  *
  * SBtrd API implementation
  *
  * This provides the Win32 implementation of the VXItrd API for basic
  * thread operations and locks. Unlike most of the other VXI APIs,
  * this is implemented in a library (on Windows a DLL with a specific
  * name, on other operating systems as a static, shared, or dynamic
  * library). Implementations of this API are operating system
  * dependant.
  *
  * To avoid cyclic dependancies, this does not perform logging. Clients
  * must do error logging themselves based on passed return codes.
  *
  *****************************************************************************
  *****************************************************************************/
 
 
 
 // -----1=0-------2=0-------3=0-------4=0-------5=0-------6=0-------7=0-------8
 
 #ifndef WIN32
 #error This file is intended only for use with the Microsoft Windows API.
 #endif
 
 #include <stdlib.h>
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 #include <process.h>
 
 #define VXITRD_EXPORTS
 #include "VXItrd.h"                   // Header for this API
 
 #if ( ! defined(NDEBUG) ) && ( ! defined(VXITRD_RECURSIVE_MUTEX) )
 #include <assert.h>
 
 /* Suppress/disable warnings triggered by asserts below */
 #pragma warning(4 : 4130) /* logical operation on address of string constant */
 #endif
 
 extern "C" struct VXItrdMutex {
 #ifdef VXITRD_KERNEL_MUTEX
   HANDLE mutex;
 #else
   CRITICAL_SECTION critSection;
 #endif
 #if ( ! defined(NDEBUG) ) && ( ! defined(VXITRD_RECURSIVE_MUTEX) )
   volatile bool locked;
 #endif
 };
 
 extern "C" struct VXItrdThread {
   HANDLE threadHandle;
   unsigned int threadID;
 };
 
 extern "C" struct VXItrdTimer {
   HANDLE timerEvent;
 };
 
 static VXIint32 g_threadStackSize = 0;
 
 // -----1=0-------2=0-------3=0-------4=0-------5=0-------6=0-------7=0-------8
 
 
 /**
  * Creates a new mutex initialized to the unlocked state.  If the calling
  * thread terminates, the created mutex is not automatically deallocated as
  * it may be shared among multiple threads.
  *
  * @return Fatal error (ex: system lacks necessary resources for creation)
  *         Success; valid mutex has been created
  */
 VXITRD_API VXItrdResult VXItrdMutexCreate(VXItrdMutex **mutex)
 {
   VXItrdResult rc = VXItrd_RESULT_SUCCESS;
   if (mutex == NULL) return VXItrd_RESULT_INVALID_ARGUMENT;
 
   *mutex = NULL;
   
   // Create the wrapper object
   VXItrdMutex *result = new VXItrdMutex;
   if (result == NULL)
     return VXItrd_RESULT_OUT_OF_MEMORY;
 #if ( ! defined(NDEBUG) ) && ( ! defined(VXITRD_RECURSIVE_MUTEX) )
   result->locked = false;
 #endif
 
   // Create the critical section or mutex, use Win32 exception
   // handling to catch predicatable problems
   __try {
 #ifdef VXITRD_KERNEL_MUTEX
     result->mutex = CreateMutex(NULL, FALSE, NULL);
     if (result->mutex == NULL)
       rc = VXItrd_RESULT_SYSTEM_ERROR;
 #else
     InitializeCriticalSection(&result->critSection);
 #endif
   }
   __except (GetExceptionCode() == STATUS_NO_MEMORY ? 
 	    EXCEPTION_EXECUTE_HANDLER : 
 	    EXCEPTION_CONTINUE_SEARCH ) {
     rc = VXItrd_RESULT_OUT_OF_MEMORY;
   }
 
   if (rc == VXItrd_RESULT_SUCCESS)
     *mutex = result;
   else if (result)
     delete result;
 
   return rc;
 }
 
 
 /**
  * Deletes an existing mutex.  It is illegal to delete a locked mutex.
  *
  * @return Fatal error (ex: invalid mutex)
  *         Success; mutex has been destroyed
  *         Mutex is locked
  */
 VXITRD_API VXItrdResult VXItrdMutexDestroy(VXItrdMutex **mutex)
 {
   VXItrdResult rc = VXItrd_RESULT_SUCCESS;
   if ((! mutex) || (! *mutex)) return VXItrd_RESULT_INVALID_ARGUMENT;
 
 #if ( ! defined(NDEBUG) ) && ( ! defined(VXITRD_RECURSIVE_MUTEX) )
   // Check the lock state
   if ( (*mutex)->locked ) {
     assert ("VXItrdMutexDestroy( ) on locked mutex" == NULL);
     return VXItrd_RESULT_FATAL_ERROR;
   }
 #endif
 
   // Are no predictable problems, so no Win32 exception handling
 #ifdef VXITRD_KERNEL_MUTEX
   if (CloseHandle((*mutex)->mutex) == FALSE)
     rc = VXItrd_RESULT_SYSTEM_ERROR;
 #else
   DeleteCriticalSection(&(*mutex)->critSection);
 #endif
 
   delete *mutex;
   *mutex = NULL;
   return rc;
 }
 
 
 /**
  * Locks an existing mutex.  If the mutex is already locked, the thread waits
  * for the mutex to become available.
  *
  * @return: Fatal error (ex: invalid mutex or deadlock detected)
  *          Success; mutex is now locked
  *          Mutex already locked by current thread.
  */
 VXITRD_API VXItrdResult VXItrdMutexLock(VXItrdMutex *mutex)
 {
   if (mutex == NULL) return VXItrd_RESULT_INVALID_ARGUMENT;
   
   __try {
 #ifdef VXITRD_KERNEL_MUTEX
     int result = WaitForSingleObject(mutex->mutex, INFINITE);
     if (result == WAIT_FAILED) 
       return VXItrd_RESULT_SYSTEM_ERROR;
 #else
     EnterCriticalSection(&mutex->critSection);
 #endif
   }
   __except (GetExceptionCode() == STATUS_INVALID_HANDLE ? 
 	    EXCEPTION_EXECUTE_HANDLER : 
 	    EXCEPTION_CONTINUE_SEARCH ) {
     // Yes, Microsoft says STATUS_INVALID_HANDLE is returned on low memory
     return VXItrd_RESULT_OUT_OF_MEMORY;
   }
   
 #if ( ! defined(NDEBUG) ) && ( ! defined(VXITRD_RECURSIVE_MUTEX) )
   // Check the lock state
   if ( mutex->locked ) {
     // Should not be locking the same mutex twice, very OS dependant
     // (Win32 says the behavior is undefined) and not gauranteed by 
     // VXItrdMutex
     assert ("VXItrdMutexLock( ) on already locked mutex" == NULL);
     return VXItrd_RESULT_FATAL_ERROR;
   } else {
     mutex->locked = true;
   }
 #endif
 
   return VXItrd_RESULT_SUCCESS;
 }
 
 
 /**
  * Unlocks a mutex owned by the thread.
  *
  * @return: Fatal error (ex: invalid mutex)
  *          Success; mutex no longer owned by calling thread
  *          Mutex not owned by thread.
  */
 VXITRD_API VXItrdResult VXItrdMutexUnlock(VXItrdMutex *mutex)
 {
   if (mutex == NULL) return VXItrd_RESULT_INVALID_ARGUMENT;
 
 #if ( ! defined(NDEBUG) ) && ( ! defined(VXITRD_RECURSIVE_MUTEX) )
   // Check the lock state
   if ( ! mutex->locked ) {
     // Unlocking a mutex that wasn't locked
     assert ("VXItrdMutexUnlock( ) on unlocked mutex" == NULL);
     return VXItrd_RESULT_FATAL_ERROR;
   } else {
     mutex->locked = false;
   }
 #endif
 
 #ifdef VXITRD_KERNEL_MUTEX
   int result = ReleaseMutex(mutex->mutex);
   if (result == FALSE)
     return VXItrd_RESULT_FATAL_ERROR;
 #else
   LeaveCriticalSection(&mutex->critSection);
 #endif
 
   return VXItrd_RESULT_SUCCESS;
 }
 
 
 /**
  * Purpose  Create a thread.  Note thread values are not supported on OS/2.
  *          execution starts on the thread immediately. To pause execution 
  *          use a Mutex between the thread and the thread creator.
  *
  * @param   thread the thread object to be created
  * @param   start_func the function for the thread to start execution on
  * @param   arg the arguments to the thread function
  * @return  VXItrdResult of operation.  Return SUCCESS if thread has been 
  *          created and started.
  *
  */
 VXITRD_API 
 VXItrdResult VXItrdThreadCreate(VXItrdThread **thread,
 				VXItrdThreadStartFunc thread_function,
 				VXItrdThreadArg thread_arg)
 {
   if ((thread == NULL) || (thread_function == NULL))
     return VXItrd_RESULT_INVALID_ARGUMENT;
 
   *thread = NULL;
 
   // Create the wrapper object
   VXItrdThread *result = new VXItrdThread;
   if (result == NULL)
     return VXItrd_RESULT_OUT_OF_MEMORY;