tlibbe.cxx

sloedgy open sip stack source code

    #endif
    return 1;
  }

  if ( result == B_OK ) 
  { 
    // thread is dead
     return 1;
  }

  if ( result == B_BAD_THREAD_ID ) 
  { 
    // thread has invalid id
    return 1;
  }

  return 0; // ???
}

PThreadIdentifier PThread::GetCurrentThreadId(void)
{
  return ::find_thread(NULL);
}

int PThread::PXBlockOnIO(int handle, int type, const PTimeInterval & timeout)
{
  PTRACE(7, "PWLib\tPThread::PXBlockOnIO(" << handle << ',' << type << ')');

  if ((handle < 0) || (handle >= PProcess::Current().GetMaxHandles())) {
    PTRACE(2, "PWLib\tAttempt to use illegal handle in PThread::PXBlockOnIO, handle=" << handle);
    errno = EBADF;
    return -1;
  }

  // make sure we flush the buffer before doing a write
  P_fd_set read_fds;
  P_fd_set write_fds;
  P_fd_set exception_fds;

  int retval;
  do {
    switch (type) {
      case PChannel::PXReadBlock:
      case PChannel::PXAcceptBlock:
        read_fds = handle;
        write_fds.Zero();
        exception_fds.Zero();
        break;
      case PChannel::PXWriteBlock:
        read_fds.Zero();
        write_fds = handle;
        exception_fds.Zero();
        break;
      case PChannel::PXConnectBlock:
        read_fds.Zero();
        write_fds = handle;
        exception_fds = handle;
        break;
      default:
        PAssertAlways(PLogicError);
        return 0;
    }

    // include the termination pipe into all blocking I/O functions
    read_fds += unblockPipe[0];

    P_timeval tval = timeout;
    retval = ::select(PMAX(handle, unblockPipe[0])+1,
                      read_fds, write_fds, exception_fds, tval);
  } while (retval < 0 && errno == EINTR);

  if ((retval == 1) && read_fds.IsPresent(unblockPipe[0])) {
    BYTE ch;
    ::read(unblockPipe[0], &ch, 1);
    errno = EINTR;
    retval =  -1;
    PTRACE(6, "PWLib\tUnblocked I/O");
  }

  return retval;
}

void PThread::PXAbortBlock(void) const
{
  BYTE ch;
  ::write(unblockPipe[1], &ch, 1);
}

///////////////////////////////////////////////////////////////////////////////
// PProcess
PDECLARE_CLASS(PHouseKeepingThread, PThread)
  public:
    PHouseKeepingThread()
      : PThread(1000, NoAutoDeleteThread, NormalPriority, "Housekeeper")
      { closing = FALSE; Resume(); }

    void Main();
    void SetClosing() { closing = TRUE; }

  protected:
    BOOL closing;
};

void PProcess::Construct()
{
  maxHandles = FOPEN_MAX;
  PTRACE(4, "PWLib\tMaximum per-process file handles is " << maxHandles);

  ::pipe(timerChangePipe);

  // initialise the housekeeping thread
  housekeepingThread = NULL;

  CommonConstruct();
}

void PHouseKeepingThread::Main()
{
  PProcess & process = PProcess::Current();

  while (!closing) {
    PTimeInterval delay = process.timers.Process();

    int fd = process.timerChangePipe[0];

    P_fd_set read_fds = fd;
    P_timeval tval = delay;
    if (::select(fd+1, read_fds, NULL, NULL, tval) == 1) {
      BYTE ch;
      ::read(fd, &ch, 1);
    }

    process.PXCheckSignals();
  }    
}

void PProcess::SignalTimerChange()
{
  if (housekeepingThread == NULL)
  {  
    housekeepingThread = new PHouseKeepingThread;
  }

  BYTE ch;
  write(timerChangePipe[1], &ch, 1);
}

BOOL PProcess::SetMaxHandles(int newMax)
{
  return FALSE;
}

PProcess::~PProcess()
{
  PreShutdown();

  // Don't wait for housekeeper to stop if Terminate() is called from it.
  if (housekeepingThread != NULL && PThread::Current() != housekeepingThread) {
    housekeepingThread->SetClosing();
    SignalTimerChange();
    housekeepingThread->WaitForTermination();
    delete housekeepingThread;
  }

  CommonDestruct();
}

///////////////////////////////////////////////////////////////////////////////
// PSemaphore
PSemaphore::PSemaphore(BOOL fNested) : mfNested(fNested)
{
}

PSemaphore::PSemaphore(unsigned initial, unsigned)
{
  Create(initial);
}
 
void PSemaphore::Create(unsigned initial)
{
  mOwner = ::find_thread(NULL);
  PAssertOS(mOwner != B_BAD_THREAD_ID);
  if(!mfNested)
  {
    mCount = initial;
    semId = ::create_sem(initial, "PWLS"); 

    PAssertOS(semId >= B_NO_ERROR);

    #ifdef DEBUG_SEMAPHORES
    sem_info info;
    get_sem_info(semId, &info);
    PError << "::create_sem (PSemaphore()), id: " << semId << ", this: " << this << ", count:" << info.count << endl;
    #endif
  }
  else // Use BLocker
  {
    semId = (sem_id) new BLocker("PWLN", true); // PWLib use recursive locks. true for benaphore style, false for not
  }
}

PSemaphore::~PSemaphore()
{
  if(!mfNested)
  {
    status_t result = B_NO_ERROR;
    PAssertOS(semId >= B_NO_ERROR);
  
    // Transmit ownership of the semaphore to our thread
    thread_id curThread = ::find_thread(NULL);
    if(mOwner != curThread)
    {
     thread_info tinfo;
     ::get_thread_info(curThread, &tinfo);
     ::set_sem_owner(semId, tinfo.team);
      mOwner = curThread; 
    } 
 
    #ifdef DEBUG_SEMAPHORES
    sem_info info;
    get_sem_info(semId, &info);
    PError << "::delete_sem, id: " << semId << ", this: " << this << ", name: " << info.name << ", count:" << info.count;
    #endif 

    // Deleting the semaphore id
    result = ::delete_sem(semId);

    #ifdef DEBUG_SEMAPHORES
    if( result != B_NO_ERROR )
      PError << "...delete_sem failed, error: " << strerror(result) << endl;
    #endif
  }
  else // Use BLocker
  {
    delete (BLocker*) semId; // Thanks!
  }
}

void PSemaphore::Wait()
{
  if(!mfNested)
  {
    PAssertOS(semId >= B_NO_ERROR);
 
    status_t result = B_NO_ERROR;

    #ifdef DEBUG_SEMAPHORES
    sem_info info;
    get_sem_info(semId, &info);
    PError << "::acquire_sem, id: " << semId << ", name: " << info.name << ", count:" << info.count << endl;
    #endif 

    while((B_BAD_THREAD_ID != mOwner) 
      && ((result = ::acquire_sem(semId)) == B_INTERRUPTED))
    {
    }
  }
  else
  {
    ((BLocker*)semId)->Lock(); // Using class to support recursive locks 
  }
}

BOOL PSemaphore::Wait(const PTimeInterval & timeout)
{
  PInt64 ms = timeout.GetMilliSeconds();
  bigtime_t microseconds = ms * 1000;

  status_t result = B_NO_ERROR;
   
  if(!mfNested)
  {
    PAssertOS(semId >= B_NO_ERROR);
    PAssertOS(timeout < PMaxTimeInterval);

    #ifdef DEBUG_SEMAPHORES
    sem_info info;
    get_sem_info(semId, &info);
    PError << "::acquire_sem_etc " << semId << ",this: " << this << ", name: " << info.name << ", count:" << info.count 
      << ", ms: " << microseconds << endl;
    #endif
 
    while((B_BAD_THREAD_ID != mOwner) 
      && ((result = ::acquire_sem_etc(semId, 1, 
        B_RELATIVE_TIMEOUT, microseconds)) == B_INTERRUPTED))
    {
    }
  }
  else
  {
    result = ((BLocker*)semId)->LockWithTimeout(microseconds); // Using BLocker class to support recursive locks 
  }

  return ms == 0 ? FALSE : result == B_OK;
}

void PSemaphore::Signal()
{
  if(!mfNested)
  {
    PAssertOS(semId >= B_NO_ERROR);
 
    #ifdef DEBUG_SEMAPHORES
    sem_info info;
    get_sem_info(semId, &info);
    PError << "::release_sem " << semId << ", this: " << this << ", name: " << info.name << ", count:" << info.count << endl;
    #endif 
      ::release_sem(semId);
   }
   else
   {
     ((BLocker*)semId)->Unlock(); // Using BLocker class to support recursive locks 
   }		
}

BOOL PSemaphore::WillBlock() const
{
  if(!mfNested)
  {
    PAssertOS(semId >= B_NO_ERROR);

    #ifdef DEBUG_SEMAPHORES
    sem_info info;
    get_sem_info(semId, &info);
    PError << "::acquire_sem_etc (WillBlock) " << semId << ", this: " << this << ", name: " << info.name << ", count:" << info.count << endl;
    #endif
	
    status_t result = ::acquire_sem_etc(semId, 0, B_RELATIVE_TIMEOUT, 0);
    return result == B_WOULD_BLOCK;
  }
  else
  {
    return mOwner == find_thread(NULL); // If we are in our own thread, we won't lock
  }
}

///////////////////////////////////////////////////////////////////////////////
// PSyncPoint

PSyncPoint::PSyncPoint()
 : PSemaphore(FALSE) // FALSE is semaphore based, TRUE means implemented through BLocker
{
   PSemaphore::Create(0);
}

void PSyncPoint::Signal()
{
  PSemaphore::Signal();
}
                                                                                                      
void PSyncPoint::Wait()
{
  PSemaphore::Wait();
}
                                                                                                      
BOOL PSyncPoint::Wait(const PTimeInterval & timeout)
{
  return PSemaphore::Wait(timeout);
}
                                                                                                      
BOOL PSyncPoint::WillBlock() const
{
  return PSemaphore::WillBlock();
}

//////////////////////////////////////////////////////////////////////////////
// PMutex, derived from BLightNestedLocker  

PMutex::PMutex() 
  : PSemaphore(TRUE) // TRUE means implemented through BLocker
{
  PSemaphore::Create(0);
}

PMutex::PMutex(const PMutex&) 
 : PSemaphore(TRUE)
{
  PAssertAlways("PMutex copy constructor not supported");
} 

void PMutex::Signal()
{
  PSemaphore::Signal();
}
                                                                                                      
void PMutex::Wait()
{
  PSemaphore::Wait();
}
                                                                                                      
BOOL PMutex::Wait(const PTimeInterval & timeout)
{
  return PSemaphore::Wait(timeout);
}
                                                                                                      
BOOL PMutex::WillBlock() const
{
  return PSemaphore::WillBlock();
}

//////////////////////////////////////////////////////////////////////////////
// Extra functionality not found in BeOS

int seteuid(uid_t uid) { return 0; }
int setegid(gid_t gid) { return 0; }

///////////////////////////////////////////////////////////////////////////////
// Toolchain dependent stuff
#if (__GNUC_MINOR__  > 9)
#warning "Using gcc 2.95.x"
    ostream& ostream::write(const char *s, streamsize n) { return write(s, (long) n); };
    istream& istream::read(char *s, streamsize n) { return read(s, (long) n); };
#endif // gcc minor  > 9  

// End Of File ///////////////////////////////////////////////////////////////