TWin32Condition.h

Go to the documentation of this file.

// @(#)root/thread:$Id$
// Author: Bertrand Bellenot  20/10/2004
 
/*************************************************************************
 * Copyright (C) 1995-2004, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
#ifndef ROOT_TWin32Condition
#define ROOT_TWin32Condition
 
 
//////////////////////////////////////////////////////////////////////////
//                                                                      //
// TWin32Condition                                                      //
//                                                                      //
// This class provides an interface to the win32 condition variable     //
// routines.                                                            //
//                                                                      //
//////////////////////////////////////////////////////////////////////////
 
#include "TConditionImp.h"
 
#include "Windows4Root.h"
 
typedef struct
{
   int waiters_count_;
   // Number of waiting threads.
 
   CRITICAL_SECTION waiters_count_lock_;
   // Serialize access to <waiters_count_>.
 
   HANDLE sema_;
   // Semaphore used to queue up threads waiting for the condition to
   // become signaled.
 
   HANDLE waiters_done_;
   // An auto-reset event used by the broadcast/signal thread to wait
   // for all the waiting thread(s) to wake up and be released from the
   // semaphore.
 
   size_t was_broadcast_;
   // Keeps track of whether we were broadcasting or signaling.  This
   // allows us to optimize the code if we're just signaling.
} pthread_cond_t;
 
class TMutexImp;
class TWin32Mutex;
 
 
class TWin32Condition : public TConditionImp {
 
private:
   pthread_cond_t  fCond;    // the pthread condition variable
   TWin32Mutex    *fMutex;   // mutex used around Wait() and TimedWait()
 
public:
   TWin32Condition(TMutexImp *m);
   virtual ~TWin32Condition();
 
   Int_t  Wait() override;
   Int_t  TimedWait(ULong_t secs, ULong_t nanoSecs = 0) override;
   Int_t  Signal() override;
   Int_t  Broadcast() override;
 
   ClassDefOverride(TWin32Condition,0)   // Posix condition variable
};
 
#endif