debian/libwvstreams-dev/usr/include/wvstreams/wvcont.h

/* -*- Mode: C++ -*-
 * Worldvisions Weaver Software:
 *   Copyright (C) 1997-2002 Net Integration Technologies, Inc.
 *
 * FIXME: I was too lazy to templatize this properly, so we only support
 * WvCallback<void*,void*>.  It should be possible to work with any kind
 * of return value and parameter, although it makes sense to limit things
 * to just one parameter (since it currently has to be returned by yield()
 * somehow).
 */
 
#ifndef __WVCONT_H
#define __WVCONT_H
 
#include "wvlinklist.h"
#include "wvstreamsdebugger.h"
#include "wvtr1.h"
 
typedef wv::function<void*(void*)> WvContCallback;

class WvCont
{
    struct Data;
    friend struct Data;
    typedef WvList<Data> DataList;
    
private:
    Data *data;
    static DataList *data_list;
 
    static Data *curdata;
    static int taskdepth;
    
    static void bouncer(void *userdata);
    
    void *call()
        { return _call(data); }
    
    static void *_call(Data *data);

    WvCont(Data *data);
 
public:
    WvCont(const WvContCallback &cb, unsigned long stacksize = 64*1024);
    
    WvCont(const WvCont &cb);
    
    ~WvCont();
    
    void *operator() (void *p1 = 0);
    
    // the following are static because a function doesn't really know
    // which WvCont it belongs to, and only one WvCont can be the "current"
    // one globally in an application anyway.
    // 
    // Unfortunately this prevents us from assert()ing that you're in the
    // context you think you are.
    
    static WvCont current();

    static void *yield(void *ret = 0);
    
    static bool isok();
 
    
    template <typename R, typename T>
        static R c_bouncer(T t, void *_cont)
        {
            WvCont &cont = *(WvCont *)_cont;
            return (R)cont((T)t);
        }
 

    template <typename R>
     static R c_bouncer(void *_cont)
        {
            WvCont &cont = *(WvCont *)_cont;
            return (R)cont(0);
        }
 
private:
    static WvString debugger_conts_run_cb(WvStringParm cmd, WvStringList &args,
        WvStreamsDebugger::ResultCallback result_cb, void *);
};
 
#endif // __WVCONT_H