//// Copyright (C) 2004, 2005 Pingtel Corp.// //// $$//////////////////////////////////////////////////////////////////////////////// SYSTEM INCLUDES#include <assert.h>// APPLICATION INCLUDES#include "os/OsUtil.h"#include "ps/PsKeybdDev.h"#ifdef _VXWORKS#include "ps/vxw/PsKeybdDevBrutus.h"#include "ps/vxw/PsKeybdDevTcas.h"#elif defined(_WIN32)#include "ps/wnt/PsKeybdDevWnt.h"#elif defined(__pingtel_on_posix__)#include "ps/linux/PsKeybdDevLinux.h"#else#error Unsupported target platform.#endif// EXTERNAL FUNCTIONS// EXTERNAL VARIABLES// CONSTANTS// STATIC VARIABLE INITIALIZATIONSPsKeybdDev* PsKeybdDev::spInstance = 0;OsBSem      PsKeybdDev::sLock(OsBSem::Q_PRIORITY, OsBSem::FULL);/* //////////////////////////// PUBLIC //////////////////////////////////// *//* ============================ CREATORS ================================== */// Return a pointer to the keyboard device, creating it if necessaryPsKeybdDev* PsKeybdDev::getKeybdDev(PsButtonTask* pButtonTask){   // If the object already exists, then just return it   if (spInstance != NULL)      return spInstance;   // If the object does not yet exist, then acquire the lock to ensure that   // only one instance of the object is created   sLock.acquire();   if (spInstance == NULL)   {      // we must have a valid hookswitch task pointer before calling the      // constructor for the hookswitch device      assert(pButtonTask != NULL);      switch (OsUtil::getPlatformType())      {#ifdef _VXWORKS      case OsUtil::PLATFORM_BRUTUS:         spInstance = new PsKeybdDevBrutus(pButtonTask);         break;      case OsUtil::PLATFORM_TCAS1:             // fall through      case OsUtil::PLATFORM_TCAS2:      case OsUtil::PLATFORM_TCAS3:      case OsUtil::PLATFORM_TCAS4:      case OsUtil::PLATFORM_TCAS5:      case OsUtil::PLATFORM_TCAS6:      case OsUtil::PLATFORM_TCAS7:         spInstance = new PsKeybdDevTcas(pButtonTask);         break;#elif defined(_WIN32)      case OsUtil::PLATFORM_WIN32:         spInstance = new PsKeybdDevWnt(pButtonTask);         break;#elif defined(__pingtel_on_posix__)      case OsUtil::PLATFORM_LINUX:      case OsUtil::PLATFORM_SOLARIS:         spInstance = new PsKeybdDevLinux(pButtonTask);         break;#else#error Unsupported target platform.#endif      default:         assert(FALSE);      }   }   sLock.release();   return spInstance;}// DestructorPsKeybdDev::~PsKeybdDev(){   spInstance = NULL;}/* ============================ MANIPULATORS ============================== *//* ============================ ACCESSORS ================================= *//* ============================ INQUIRY =================================== *//* //////////////////////////// PROTECTED ///////////////////////////////// */// Default constructor (called only indirectly via getKeybdDev())PsKeybdDev::PsKeybdDev(PsButtonTask* pButtonTask):  mpButtonTask(pButtonTask){   // no further initialization is required}/* //////////////////////////// PRIVATE /////////////////////////////////// *//* ============================ FUNCTIONS ================================= */