critsec.h

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/*
**  Command & Conquer Generals Zero Hour(tm)
**  Copyright 2025 Electronic Arts Inc.
**
**  This program is free software: you can redistribute it and/or modify
**  it under the terms of the GNU General Public License as published by
**  the Free Software Foundation, either version 3 of the License, or
**  (at your option) any later version.
**
**  This program is distributed in the hope that it will be useful,
**  but WITHOUT ANY WARRANTY; without even the implied warranty of
**  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
**  GNU General Public License for more details.
**
**  You should have received a copy of the GNU General Public License
**  along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
 
#ifndef CRITSEC_HEADER
#define CRITSEC_HEADER
 
#include "wstypes.h"
#ifdef _WIN32
 #include <windows.h>
 #include <winbase.h>
#elif defined(_UNIX)
  #include <pthread.h>
  #include <errno.h>
#endif
 
// Windows headers have a tendency to redefine IN
#ifdef IN
#undef IN
#endif
#define IN const
 
//
// Critical Section built either on a POSIX Mutex, or a Win32 Critical Section
//
// POSIX version is done by keeping a thread_id and a reference count.  Win32 version
//  just calls the built in functions.
//
class CritSec
{
 public:
                CritSec();
               ~CritSec();
    
  sint32      lock(int *refcount=NULL) RO;
  sint32      unlock(void) RO;
 
 protected:
  #ifdef _WIN32
    mutable CRITICAL_SECTION    CritSec_;
  #else
    mutable pthread_mutex_t Mutex_;         // Mutex lock
    mutable pthread_t       ThreadId_; // Owner of mutex
    mutable int                 RefCount_;      // Reference count
  #endif
};
 
#endif