ccoroutine.h

//==========================================================================
//   CCOROUTINE.H  -  header for
//                     OMNeT++/OMNEST
//            Discrete System Simulation in C++
//
//==========================================================================
 
/*--------------------------------------------------------------*
  Copyright (C) 1992-2017 Andras Varga
  Copyright (C) 2006-2017 OpenSim Ltd.
 
  This file is distributed WITHOUT ANY WARRANTY. See the file
  `license' for details on this and other legal matters.
*--------------------------------------------------------------*/
 
#ifndef __OMNETPP_CCOROUTINE_H
#define __OMNETPP_CCOROUTINE_H
 
#include "platdep/platmisc.h"  // for <windows.h>
#include "simkerneldefs.h"
 
#if !defined(USE_WIN32_FIBERS) && !defined(USE_POSIX_COROUTINES) && !defined(USE_PORTABLE_COROUTINES)
#error "Coroutine library choice not specified"
#endif
 
#ifdef USE_POSIX_COROUTINES
#include <ucontext.h>
#endif
 
namespace omnetpp {
 
#ifdef USE_PORTABLE_COROUTINES
struct _Task;
#endif
 
typedef void (*CoroutineFnp)( void * );
 
 
class SIM_API cCoroutine
{
  protected:
#ifdef USE_WIN32_FIBERS
    LPVOID lpFiber = 0;
    static LPVOID lpMainFiber;
    unsigned stackSize = 0;
#endif
#ifdef USE_POSIX_COROUTINES
    static ucontext_t mainContext;
    static ucontext_t *curContextPtr;
    static unsigned totalStackLimit;
    static unsigned totalStackUsage;
    unsigned stackSize = 0;
    char *stackPtr = nullptr;
    ucontext_t context;
#endif
#ifdef USE_PORTABLE_COROUTINES
    _Task *task;
#endif
 
  public:
 
    static void init(unsigned totalStack, unsigned mainStack);
 
    static void switchTo(cCoroutine *cor);
 
    static void switchToMain();
 
 
    bool setup(CoroutineFnp fnp, void *arg, unsigned stackSize);
 
    cCoroutine();
 
    virtual ~cCoroutine();
 
 
    virtual bool hasStackOverflow() const;
 
    virtual unsigned getStackSize() const;
 
    virtual unsigned getStackUsage() const;
};
 
}  // namespace omnetpp
 
 
#endif