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dashley |
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/* $Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/tcl_base/tclwinnotify.c,v 1.1.1.1 2001/06/13 04:49:27 dtashley Exp $ */
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/*
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* tclWinNotify.c --
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*
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* This file contains Windows-specific procedures for the notifier,
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* which is the lowest-level part of the Tcl event loop. This file
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* works together with ../generic/tclNotify.c.
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*
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* Copyright (c) 1995-1997 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* RCS: @(#) $Id: tclwinnotify.c,v 1.1.1.1 2001/06/13 04:49:27 dtashley Exp $
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*/
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#include "tclWinInt.h"
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#include <winsock.h>
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/*
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* The follwing static indicates whether this module has been initialized.
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*/
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static int initialized = 0;
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#define INTERVAL_TIMER 1 /* Handle of interval timer. */
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#define WM_WAKEUP WM_USER /* Message that is send by
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* Tcl_AlertNotifier. */
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/*
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* The following static structure contains the state information for the
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* Windows implementation of the Tcl notifier. One of these structures
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* is created for each thread that is using the notifier.
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*/
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typedef struct ThreadSpecificData {
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CRITICAL_SECTION crit; /* Monitor for this notifier. */
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DWORD thread; /* Identifier for thread associated with this
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* notifier. */
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HANDLE event; /* Event object used to wake up the notifier
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* thread. */
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int pending; /* Alert message pending, this field is
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* locked by the notifierMutex. */
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HWND hwnd; /* Messaging window. */
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int timeout; /* Current timeout value. */
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int timerActive; /* 1 if interval timer is running. */
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} ThreadSpecificData;
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static Tcl_ThreadDataKey dataKey;
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extern TclStubs tclStubs;
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/*
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* The following static indicates the number of threads that have
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* initialized notifiers. It controls the lifetime of the TclNotifier
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* window class.
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*
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* You must hold the notifierMutex lock before accessing this variable.
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*/
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static int notifierCount = 0;
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TCL_DECLARE_MUTEX(notifierMutex)
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/*
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* Static routines defined in this file.
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*/
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static LRESULT CALLBACK NotifierProc(HWND hwnd, UINT message,
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WPARAM wParam, LPARAM lParam);
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/*
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*----------------------------------------------------------------------
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*
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* Tcl_InitNotifier --
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*
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* Initializes the platform specific notifier state.
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*
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* Results:
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* Returns a handle to the notifier state for this thread..
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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ClientData
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Tcl_InitNotifier()
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{
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ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
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WNDCLASS class;
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/*
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* Register Notifier window class if this is the first thread to
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* use this module.
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*/
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Tcl_MutexLock(¬ifierMutex);
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if (notifierCount == 0) {
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class.style = 0;
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class.cbClsExtra = 0;
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class.cbWndExtra = 0;
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class.hInstance = TclWinGetTclInstance();
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class.hbrBackground = NULL;
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class.lpszMenuName = NULL;
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class.lpszClassName = "TclNotifier";
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class.lpfnWndProc = NotifierProc;
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class.hIcon = NULL;
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class.hCursor = NULL;
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if (!RegisterClassA(&class)) {
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panic("Unable to register TclNotifier window class");
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}
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}
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notifierCount++;
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Tcl_MutexUnlock(¬ifierMutex);
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tsdPtr->pending = 0;
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tsdPtr->timerActive = 0;
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InitializeCriticalSection(&tsdPtr->crit);
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tsdPtr->hwnd = NULL;
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tsdPtr->thread = GetCurrentThreadId();
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tsdPtr->event = CreateEvent(NULL, TRUE /* manual */,
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FALSE /* !signaled */, NULL);
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return (ClientData) tsdPtr;
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}
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/*
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*----------------------------------------------------------------------
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*
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* Tcl_FinalizeNotifier --
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*
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* This function is called to cleanup the notifier state before
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* a thread is terminated.
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*
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* Results:
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* None.
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*
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* Side effects:
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* May dispose of the notifier window and class.
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*
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*----------------------------------------------------------------------
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*/
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void
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Tcl_FinalizeNotifier(clientData)
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ClientData clientData; /* Pointer to notifier data. */
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{
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ThreadSpecificData *tsdPtr = (ThreadSpecificData *) clientData;
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DeleteCriticalSection(&tsdPtr->crit);
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CloseHandle(tsdPtr->event);
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/*
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* Clean up the timer and messaging window for this thread.
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*/
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if (tsdPtr->hwnd) {
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KillTimer(tsdPtr->hwnd, INTERVAL_TIMER);
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DestroyWindow(tsdPtr->hwnd);
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}
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/*
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* If this is the last thread to use the notifier, unregister
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* the notifier window class.
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*/
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Tcl_MutexLock(¬ifierMutex);
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notifierCount--;
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if (notifierCount == 0) {
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UnregisterClassA("TclNotifier", TclWinGetTclInstance());
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}
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Tcl_MutexUnlock(¬ifierMutex);
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}
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/*
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*----------------------------------------------------------------------
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*
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* Tcl_AlertNotifier --
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*
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* Wake up the specified notifier from any thread. This routine
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* is called by the platform independent notifier code whenever
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* the Tcl_ThreadAlert routine is called. This routine is
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* guaranteed not to be called on a given notifier after
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* Tcl_FinalizeNotifier is called for that notifier. This routine
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* is typically called from a thread other than the notifier's
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* thread.
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*
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* Results:
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* None.
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*
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* Side effects:
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* Sends a message to the messaging window for the notifier
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* if there isn't already one pending.
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*
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*----------------------------------------------------------------------
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*/
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void
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Tcl_AlertNotifier(clientData)
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ClientData clientData; /* Pointer to thread data. */
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{
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ThreadSpecificData *tsdPtr = (ThreadSpecificData *) clientData;
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/*
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* Note that we do not need to lock around access to the hwnd
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* because the race condition has no effect since any race condition
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* implies that the notifier thread is already awake.
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*/
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if (tsdPtr->hwnd) {
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/*
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* We do need to lock around access to the pending flag.
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*/
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EnterCriticalSection(&tsdPtr->crit);
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if (!tsdPtr->pending) {
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PostMessage(tsdPtr->hwnd, WM_WAKEUP, 0, 0);
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}
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tsdPtr->pending = 1;
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LeaveCriticalSection(&tsdPtr->crit);
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} else {
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SetEvent(tsdPtr->event);
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}
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}
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/*
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*----------------------------------------------------------------------
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*
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* Tcl_SetTimer --
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*
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* This procedure sets the current notifier timer value. The
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* notifier will ensure that Tcl_ServiceAll() is called after
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* the specified interval, even if no events have occurred.
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*
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* Results:
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* None.
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*
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* Side effects:
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* Replaces any previous timer.
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*
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*----------------------------------------------------------------------
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*/
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void
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Tcl_SetTimer(
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Tcl_Time *timePtr) /* Maximum block time, or NULL. */
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{
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ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
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UINT timeout;
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/*
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* Allow the notifier to be hooked. This may not make sense
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* on Windows, but mirrors the UNIX hook.
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*/
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if (tclStubs.tcl_SetTimer != Tcl_SetTimer) {
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tclStubs.tcl_SetTimer(timePtr);
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return;
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}
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/*
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* We only need to set up an interval timer if we're being called
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* from an external event loop. If we don't have a window handle
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* then we just return immediately and let Tcl_WaitForEvent handle
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* timeouts.
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*/
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if (!tsdPtr->hwnd) {
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return;
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}
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if (!timePtr) {
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timeout = 0;
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} else {
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280 |
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/*
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* Make sure we pass a non-zero value into the timeout argument.
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* Windows seems to get confused by zero length timers.
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*/
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timeout = timePtr->sec * 1000 + timePtr->usec / 1000;
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if (timeout == 0) {
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timeout = 1;
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}
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}
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tsdPtr->timeout = timeout;
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if (timeout != 0) {
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tsdPtr->timerActive = 1;
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SetTimer(tsdPtr->hwnd, INTERVAL_TIMER,
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(unsigned long) tsdPtr->timeout, NULL);
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} else {
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tsdPtr->timerActive = 0;
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KillTimer(tsdPtr->hwnd, INTERVAL_TIMER);
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}
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}
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/*
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302 |
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*----------------------------------------------------------------------
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303 |
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*
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304 |
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* Tcl_ServiceModeHook --
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305 |
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*
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306 |
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* This function is invoked whenever the service mode changes.
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*
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308 |
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* Results:
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* None.
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310 |
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*
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311 |
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* Side effects:
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* If this is the first time the notifier is set into
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* TCL_SERVICE_ALL, then the communication window is created.
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*
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*----------------------------------------------------------------------
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*/
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317 |
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void
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319 |
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Tcl_ServiceModeHook(mode)
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320 |
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int mode; /* Either TCL_SERVICE_ALL, or
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* TCL_SERVICE_NONE. */
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322 |
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{
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323 |
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ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
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/*
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326 |
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* If this is the first time that the notifier has been used from a
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* modal loop, then create a communication window. Note that after
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* this point, the application needs to service events in a timely
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* fashion or Windows will hang waiting for the window to respond
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* to synchronous system messages. At some point, we may want to
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* consider destroying the window if we leave the modal loop, but
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332 |
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* for now we'll leave it around.
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333 |
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*/
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334 |
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335 |
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if (mode == TCL_SERVICE_ALL && !tsdPtr->hwnd) {
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336 |
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tsdPtr->hwnd = CreateWindowA("TclNotifier", "TclNotifier", WS_TILED,
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337 |
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0, 0, 0, 0, NULL, NULL, TclWinGetTclInstance(), NULL);
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338 |
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/*
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339 |
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* Send an initial message to the window to ensure that we wake up the
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340 |
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* notifier once we get into the modal loop. This will force the
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341 |
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* notifier to recompute the timeout value and schedule a timer
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342 |
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* if one is needed.
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*/
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344 |
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Tcl_AlertNotifier((ClientData)tsdPtr);
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346 |
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}
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347 |
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}
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348 |
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349 |
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/*
|
350 |
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*----------------------------------------------------------------------
|
351 |
|
|
*
|
352 |
|
|
* NotifierProc --
|
353 |
|
|
*
|
354 |
|
|
* This procedure is invoked by Windows to process events on
|
355 |
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* the notifier window. Messages will be sent to this window
|
356 |
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|
* in response to external timer events or calls to
|
357 |
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|
* TclpAlertTsdPtr->
|
358 |
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|
*
|
359 |
|
|
* Results:
|
360 |
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|
* A standard windows result.
|
361 |
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|
*
|
362 |
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|
* Side effects:
|
363 |
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|
* Services any pending events.
|
364 |
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*
|
365 |
|
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*----------------------------------------------------------------------
|
366 |
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*/
|
367 |
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|
368 |
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|
static LRESULT CALLBACK
|
369 |
|
|
NotifierProc(
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370 |
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HWND hwnd,
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371 |
|
|
UINT message,
|
372 |
|
|
WPARAM wParam,
|
373 |
|
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LPARAM lParam)
|
374 |
|
|
{
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375 |
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ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
|
376 |
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377 |
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if (message == WM_WAKEUP) {
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378 |
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EnterCriticalSection(&tsdPtr->crit);
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379 |
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tsdPtr->pending = 0;
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380 |
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LeaveCriticalSection(&tsdPtr->crit);
|
381 |
|
|
} else if (message != WM_TIMER) {
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382 |
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|
return DefWindowProc(hwnd, message, wParam, lParam);
|
383 |
|
|
}
|
384 |
|
|
|
385 |
|
|
/*
|
386 |
|
|
* Process all of the runnable events.
|
387 |
|
|
*/
|
388 |
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|
|
389 |
|
|
Tcl_ServiceAll();
|
390 |
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|
return 0;
|
391 |
|
|
}
|
392 |
|
|
|
393 |
|
|
/*
|
394 |
|
|
*----------------------------------------------------------------------
|
395 |
|
|
*
|
396 |
|
|
* Tcl_WaitForEvent --
|
397 |
|
|
*
|
398 |
|
|
* This function is called by Tcl_DoOneEvent to wait for new
|
399 |
|
|
* events on the message queue. If the block time is 0, then
|
400 |
|
|
* Tcl_WaitForEvent just polls the event queue without blocking.
|
401 |
|
|
*
|
402 |
|
|
* Results:
|
403 |
|
|
* Returns -1 if a WM_QUIT message is detected, returns 1 if
|
404 |
|
|
* a message was dispatched, otherwise returns 0.
|
405 |
|
|
*
|
406 |
|
|
* Side effects:
|
407 |
|
|
* Dispatches a message to a window procedure, which could do
|
408 |
|
|
* anything.
|
409 |
|
|
*
|
410 |
|
|
*----------------------------------------------------------------------
|
411 |
|
|
*/
|
412 |
|
|
|
413 |
|
|
int
|
414 |
|
|
Tcl_WaitForEvent(
|
415 |
|
|
Tcl_Time *timePtr) /* Maximum block time, or NULL. */
|
416 |
|
|
{
|
417 |
|
|
ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
|
418 |
|
|
MSG msg;
|
419 |
|
|
DWORD timeout, result;
|
420 |
|
|
int status;
|
421 |
|
|
|
422 |
|
|
/*
|
423 |
|
|
* Allow the notifier to be hooked. This may not make
|
424 |
|
|
* sense on windows, but mirrors the UNIX hook.
|
425 |
|
|
*/
|
426 |
|
|
|
427 |
|
|
if (tclStubs.tcl_WaitForEvent != Tcl_WaitForEvent) {
|
428 |
|
|
return tclStubs.tcl_WaitForEvent(timePtr);
|
429 |
|
|
}
|
430 |
|
|
|
431 |
|
|
/*
|
432 |
|
|
* Compute the timeout in milliseconds.
|
433 |
|
|
*/
|
434 |
|
|
|
435 |
|
|
if (timePtr) {
|
436 |
|
|
timeout = timePtr->sec * 1000 + timePtr->usec / 1000;
|
437 |
|
|
} else {
|
438 |
|
|
timeout = INFINITE;
|
439 |
|
|
}
|
440 |
|
|
|
441 |
|
|
/*
|
442 |
|
|
* Check to see if there are any messages in the queue before waiting
|
443 |
|
|
* because MsgWaitForMultipleObjects will not wake up if there are events
|
444 |
|
|
* currently sitting in the queue.
|
445 |
|
|
*/
|
446 |
|
|
|
447 |
|
|
if (!PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE)) {
|
448 |
|
|
/*
|
449 |
|
|
* Wait for something to happen (a signal from another thread, a
|
450 |
|
|
* message, or timeout).
|
451 |
|
|
*/
|
452 |
|
|
|
453 |
|
|
result = MsgWaitForMultipleObjects(1, &tsdPtr->event, FALSE, timeout,
|
454 |
|
|
QS_ALLINPUT);
|
455 |
|
|
}
|
456 |
|
|
|
457 |
|
|
/*
|
458 |
|
|
* Check to see if there are any messages to process.
|
459 |
|
|
*/
|
460 |
|
|
|
461 |
|
|
if (PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE)) {
|
462 |
|
|
/*
|
463 |
|
|
* Retrieve and dispatch the first message.
|
464 |
|
|
*/
|
465 |
|
|
|
466 |
|
|
result = GetMessage(&msg, NULL, 0, 0);
|
467 |
|
|
if (result == 0) {
|
468 |
|
|
/*
|
469 |
|
|
* We received a request to exit this thread (WM_QUIT), so
|
470 |
|
|
* propagate the quit message and start unwinding.
|
471 |
|
|
*/
|
472 |
|
|
|
473 |
|
|
PostQuitMessage(msg.wParam);
|
474 |
|
|
status = -1;
|
475 |
|
|
} else if (result == -1) {
|
476 |
|
|
/*
|
477 |
|
|
* We got an error from the system. I have no idea why this would
|
478 |
|
|
* happen, so we'll just unwind.
|
479 |
|
|
*/
|
480 |
|
|
|
481 |
|
|
status = -1;
|
482 |
|
|
} else {
|
483 |
|
|
TranslateMessage(&msg);
|
484 |
|
|
DispatchMessage(&msg);
|
485 |
|
|
status = 1;
|
486 |
|
|
}
|
487 |
|
|
} else {
|
488 |
|
|
status = 0;
|
489 |
|
|
}
|
490 |
|
|
|
491 |
|
|
ResetEvent(tsdPtr->event);
|
492 |
|
|
return status;
|
493 |
|
|
}
|
494 |
|
|
|
495 |
|
|
/*
|
496 |
|
|
*----------------------------------------------------------------------
|
497 |
|
|
*
|
498 |
|
|
* Tcl_Sleep --
|
499 |
|
|
*
|
500 |
|
|
* Delay execution for the specified number of milliseconds.
|
501 |
|
|
*
|
502 |
|
|
* Results:
|
503 |
|
|
* None.
|
504 |
|
|
*
|
505 |
|
|
* Side effects:
|
506 |
|
|
* Time passes.
|
507 |
|
|
*
|
508 |
|
|
*----------------------------------------------------------------------
|
509 |
|
|
*/
|
510 |
|
|
|
511 |
|
|
void
|
512 |
|
|
Tcl_Sleep(ms)
|
513 |
|
|
int ms; /* Number of milliseconds to sleep. */
|
514 |
|
|
{
|
515 |
|
|
Sleep(ms);
|
516 |
|
|
}
|
517 |
|
|
|
518 |
|
|
|
519 |
|
|
/* $History: tclwinnotify.c $
|
520 |
|
|
*
|
521 |
|
|
* ***************** Version 1 *****************
|
522 |
|
|
* User: Dtashley Date: 1/02/01 Time: 12:28a
|
523 |
|
|
* Created in $/IjuScripter, IjuConsole/Source/Tcl Base
|
524 |
|
|
* Initial check-in.
|
525 |
|
|
*/
|
526 |
|
|
|
527 |
|
|
/* End of TCLWINNOTIFY.C */ |