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/*
* Console control handler support.
*
*/
#pragma once
/*
* Console control handlers lets an application handle Ctrl+C, Ctrl+Break etc.
* in Haskell under Win32. Akin to the Unix signal SIGINT.
*
* The API offered by ConsoleHandler.h is identical to that of the
* signal handling code (which isn't supported under win32.)
* Unsurprisingly, the underlying impl is derived from the signal
* handling code also.
*/
#if !defined(THREADED_RTS)
/*
* under THREADED_RTS, console events are passed to the IO manager
* thread, which starts up the handler. See ThrIOManager.c.
*/
/*
* Function: signals_pending()
*
* Used by the RTS to check whether new signals have been 'recently' reported.
* If so, the RTS arranges for the delivered signals to be handled by
* de-queueing them from their table, running the associated Haskell
* signal handler.
*/
extern StgInt stg_pending_events;
#define signals_pending() ( stg_pending_events > 0)
/*
* Function: anyUserHandlers()
*
* Used by the Scheduler to decide whether its worth its while to stick
* around waiting for an external signal when there are no threads
* runnable. A console handler is used to handle termination events (Ctrl+C)
* and isn't considered a 'user handler'.
*/
#define anyUserHandlers() (false)
/*
* Function: startSignalHandlers()
*
* Run the handlers associated with the queued up console events. Console
* event delivery is blocked for the duration of this call.
*/
extern void startSignalHandlers(Capability *cap);
/*
* Function: rts_waitConsoleHandlerCompletion()
*
* Esoteric entry point used by worker thread that got woken
* up as part Ctrl-C delivery.
*/
extern int rts_waitConsoleHandlerCompletion(void);
#endif /* THREADED_RTS */
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