/*    					W3C Sample Code Library libwww Default Event Manager!  Default Event Manager!*//***	(c) COPYRIGHT MIT 1995.**	Please first read the full copyright statement in the file COPYRIGH.*//*This module provides a default event registry and an eventloop which maybe used by an application if desired. See also the libwww timers definedin the HTTimer module. An application may usethis module for:	 	   o 	     Eventloop and registry - Application registers    HTEvntrg_register and HTEvntrg_unregister and calls    HTEventList_loop to dispatch events as they occur.  o 	     Event registry - Application just registers its own    event handlers and chains them to    HTEvntrg_register and HTEvntrg_unregister. When the    application's eventloop gets activity on a socket, it calls    HTEvent_dispatch to handle it.  o 	     Nothing - Application registers its own    event handler uses its own eventloop    to dispatch those events.	 This module is implemented by HTEvtLst.c, and itis a part of the W3C Sample CodeLibrary.*/#ifndef HTEVTLST_H#define HTEVTLST_H#include "wwwsys.h"#include "HTEvent.h"#include "HTReq.h"/*(  Windows Specific Handles)*/#if defined(WWW_WIN_ASYNC) || defined(WWW_WIN_DLL)extern BOOL HTEventList_winHandle (HTRequest * request);extern BOOL HTEventList_setWinHandle (HWND window, unsigned long message);extern HWND HTEventList_getWinHandle (unsigned long * pMessage);extern LRESULT CALLBACK AsyncWindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);#endif/*.  Event Registry.The libwww event registry binds a socket and operation (FD_READ,FD_WRITE, ...) to a callback function. Events are registered,unregistered, and dispatched as they come in.(  Register an Event Handler)For a given socket, reqister a request structure, a set of operations, aHTEventCallback function, and a priority. For this implementation, we allowonly a single HTEventCallback function for all operations. and the priorityfield is ignored.*/extern HTEvent_registerCallback HTEventList_register;/*(  Unregister an Event Handler)Remove the registered information for the specified socket for the actionsspecified in ops. if no actions remain after the unregister, the registeredinfo is deleted, and, if the socket has been registered for notification,the HTEventCallback will be invoked.*/extern HTEvent_unregisterCallback HTEventList_unregister;/*(  Unregister ALL Event Handlers)Unregister all sockets. N.B. we just remove them for our internal datastructures: it is up to the application to actually close the socket.*/extern int HTEventList_unregisterAll (void);/*(  Lookup and Dispatch Event Handlers)Callbacks can be looked up or dispatched based on the socket and operation(read/write/oob)*/extern int HTEventList_dispatch (SOCKET s, HTEventType type, ms_t now);extern HTEvent * HTEventList_lookup (SOCKET s, HTEventType type);/*.  Libwww Default EventLoop.The libwww default eventloop dispatches events to the eventregistry.(  Start and Stop the Event Manager)*/extern BOOL HTEventInit (void);extern BOOL HTEventTerminate (void);/*(  Start the Eventloop)That is, we wait for activity from one of our registered channels, and dispatchon that. Under Windows/NT, we must treat the console and sockets as distinct.That means we can't avoid a busy wait, but we do our best.*/extern int HTEventList_newLoop (void);/*The next version is an old version of the eventloop start. The request isnot used for anything and can be NULL.*/extern int HTEventList_loop (HTRequest * request);/*(  Stop the Eventloop)Stops the (select based) eventloop immediately. The function does not guaranteethat all requests have terminated so it is important that the applicationdoes this before this function is called. This can be done using theHTNet_isIdle() function in the HTNet Module*/extern void HTEventList_stopLoop (void);/**/#endif /* HTEVTLST_H *//*    @(#) $Id: HTEvtLst.html,v 2.7 1998/11/21 02:44:42 frystyk Exp $*/