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author | William Joye <wjoye@cfa.harvard.edu> | 2017-09-22 18:51:12 (GMT) |
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committer | William Joye <wjoye@cfa.harvard.edu> | 2017-09-22 18:51:12 (GMT) |
commit | 3fa8e6dc88e8041b6cb88d1b1e9c05676d3346b7 (patch) | |
tree | 69afbb41089c8358615879f7cd3c4cf7997f4c7e /tcl8.6/generic/tclNotify.c | |
parent | a0e17db23c0fd7c771c0afce8cce350c98f90b02 (diff) | |
download | blt-3fa8e6dc88e8041b6cb88d1b1e9c05676d3346b7.zip blt-3fa8e6dc88e8041b6cb88d1b1e9c05676d3346b7.tar.gz blt-3fa8e6dc88e8041b6cb88d1b1e9c05676d3346b7.tar.bz2 |
update to tcl/tk 8.6.7
Diffstat (limited to 'tcl8.6/generic/tclNotify.c')
-rw-r--r-- | tcl8.6/generic/tclNotify.c | 1141 |
1 files changed, 0 insertions, 1141 deletions
diff --git a/tcl8.6/generic/tclNotify.c b/tcl8.6/generic/tclNotify.c deleted file mode 100644 index e76bca8..0000000 --- a/tcl8.6/generic/tclNotify.c +++ /dev/null @@ -1,1141 +0,0 @@ -/* - * tclNotify.c -- - * - * This file implements the generic portion of the Tcl notifier. The - * notifier is lowest-level part of the event system. It manages an event - * queue that holds Tcl_Event structures. The platform specific portion - * of the notifier is defined in the tcl*Notify.c files in each platform - * directory. - * - * Copyright (c) 1995-1997 Sun Microsystems, Inc. - * Copyright (c) 1998 by Scriptics Corporation. - * Copyright (c) 2003 by Kevin B. Kenny. All rights reserved. - * - * See the file "license.terms" for information on usage and redistribution of - * this file, and for a DISCLAIMER OF ALL WARRANTIES. - */ - -#include "tclInt.h" - -/* - * Module-scope struct of notifier hooks that are checked in the default - * notifier functions (for overriding via Tcl_SetNotifier). - */ - -Tcl_NotifierProcs tclNotifierHooks = { - NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL -}; - -/* - * For each event source (created with Tcl_CreateEventSource) there is a - * structure of the following type: - */ - -typedef struct EventSource { - Tcl_EventSetupProc *setupProc; - Tcl_EventCheckProc *checkProc; - ClientData clientData; - struct EventSource *nextPtr; -} EventSource; - -/* - * The following structure keeps track of the state of the notifier on a - * per-thread basis. The first three elements keep track of the event queue. - * In addition to the first (next to be serviced) and last events in the - * queue, we keep track of a "marker" event. This provides a simple priority - * mechanism whereby events can be inserted at the front of the queue but - * behind all other high-priority events already in the queue (this is used - * for things like a sequence of Enter and Leave events generated during a - * grab in Tk). These elements are protected by the queueMutex so that any - * thread can queue an event on any notifier. Note that all of the values in - * this structure will be initialized to 0. - */ - -typedef struct ThreadSpecificData { - Tcl_Event *firstEventPtr; /* First pending event, or NULL if none. */ - Tcl_Event *lastEventPtr; /* Last pending event, or NULL if none. */ - Tcl_Event *markerEventPtr; /* Last high-priority event in queue, or NULL - * if none. */ - Tcl_Mutex queueMutex; /* Mutex to protect access to the previous - * three fields. */ - int serviceMode; /* One of TCL_SERVICE_NONE or - * TCL_SERVICE_ALL. */ - int blockTimeSet; /* 0 means there is no maximum block time: - * block forever. */ - Tcl_Time blockTime; /* If blockTimeSet is 1, gives the maximum - * elapsed time for the next block. */ - int inTraversal; /* 1 if Tcl_SetMaxBlockTime is being called - * during an event source traversal. */ - EventSource *firstEventSourcePtr; - /* Pointer to first event source in list of - * event sources for this thread. */ - Tcl_ThreadId threadId; /* Thread that owns this notifier instance. */ - ClientData clientData; /* Opaque handle for platform specific - * notifier. */ - int initialized; /* 1 if notifier has been initialized. */ - struct ThreadSpecificData *nextPtr; - /* Next notifier in global list of notifiers. - * Access is controlled by the listLock global - * mutex. */ -} ThreadSpecificData; - -static Tcl_ThreadDataKey dataKey; - -/* - * Global list of notifiers. Access to this list is controlled by the listLock - * mutex. If this becomes a performance bottleneck, this could be replaced - * with a hashtable. - */ - -static ThreadSpecificData *firstNotifierPtr = NULL; -TCL_DECLARE_MUTEX(listLock) - -/* - * Declarations for routines used only in this file. - */ - -static void QueueEvent(ThreadSpecificData *tsdPtr, - Tcl_Event *evPtr, Tcl_QueuePosition position); - -/* - *---------------------------------------------------------------------- - * - * TclInitNotifier -- - * - * Initialize the thread local data structures for the notifier - * subsystem. - * - * Results: - * None. - * - * Side effects: - * Adds the current thread to the global list of notifiers. - * - *---------------------------------------------------------------------- - */ - -void -TclInitNotifier(void) -{ - ThreadSpecificData *tsdPtr; - Tcl_ThreadId threadId = Tcl_GetCurrentThread(); - - Tcl_MutexLock(&listLock); - for (tsdPtr = firstNotifierPtr; tsdPtr && tsdPtr->threadId != threadId; - tsdPtr = tsdPtr->nextPtr) { - /* Empty loop body. */ - } - - if (NULL == tsdPtr) { - /* - * Notifier not yet initialized in this thread. - */ - - tsdPtr = TCL_TSD_INIT(&dataKey); - tsdPtr->threadId = threadId; - tsdPtr->clientData = Tcl_InitNotifier(); - tsdPtr->initialized = 1; - tsdPtr->nextPtr = firstNotifierPtr; - firstNotifierPtr = tsdPtr; - } - Tcl_MutexUnlock(&listLock); -} - -/* - *---------------------------------------------------------------------- - * - * TclFinalizeNotifier -- - * - * Finalize the thread local data structures for the notifier subsystem. - * - * Results: - * None. - * - * Side effects: - * Removes the notifier associated with the current thread from the - * global notifier list. This is done only if the notifier was - * initialized for this thread by call to TclInitNotifier(). This is - * always true for threads which have been seeded with an Tcl - * interpreter, since the call to Tcl_CreateInterp will, among other - * things, call TclInitializeSubsystems() and this one will, in turn, - * call the TclInitNotifier() for the thread. For threads created without - * the Tcl interpreter, though, nobody is explicitly nor implicitly - * calling the TclInitNotifier hence, TclFinalizeNotifier should not be - * performed at all. - * - *---------------------------------------------------------------------- - */ - -void -TclFinalizeNotifier(void) -{ - ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); - ThreadSpecificData **prevPtrPtr; - Tcl_Event *evPtr, *hold; - - if (!tsdPtr->initialized) { - return; /* Notifier not initialized for the current thread */ - } - - Tcl_MutexLock(&(tsdPtr->queueMutex)); - for (evPtr = tsdPtr->firstEventPtr; evPtr != NULL; ) { - hold = evPtr; - evPtr = evPtr->nextPtr; - ckfree(hold); - } - tsdPtr->firstEventPtr = NULL; - tsdPtr->lastEventPtr = NULL; - Tcl_MutexUnlock(&(tsdPtr->queueMutex)); - - Tcl_MutexLock(&listLock); - - Tcl_FinalizeNotifier(tsdPtr->clientData); - Tcl_MutexFinalize(&(tsdPtr->queueMutex)); - for (prevPtrPtr = &firstNotifierPtr; *prevPtrPtr != NULL; - prevPtrPtr = &((*prevPtrPtr)->nextPtr)) { - if (*prevPtrPtr == tsdPtr) { - *prevPtrPtr = tsdPtr->nextPtr; - break; - } - } - tsdPtr->initialized = 0; - - Tcl_MutexUnlock(&listLock); -} - -/* - *---------------------------------------------------------------------- - * - * Tcl_SetNotifier -- - * - * Install a set of alternate functions for use with the notifier. In - * particular, this can be used to install the Xt-based notifier for use - * with the Browser plugin. - * - * Results: - * None. - * - * Side effects: - * Set the tclNotifierHooks global, which is checked in the default - * notifier functions. - * - *---------------------------------------------------------------------- - */ - -void -Tcl_SetNotifier( - Tcl_NotifierProcs *notifierProcPtr) -{ - tclNotifierHooks = *notifierProcPtr; -} - -/* - *---------------------------------------------------------------------- - * - * Tcl_CreateEventSource -- - * - * This function is invoked to create a new source of events. The source - * is identified by a function that gets invoked during Tcl_DoOneEvent to - * check for events on that source and queue them. - * - * - * Results: - * None. - * - * Side effects: - * SetupProc and checkProc will be invoked each time that Tcl_DoOneEvent - * runs out of things to do. SetupProc will be invoked before - * Tcl_DoOneEvent calls select or whatever else it uses to wait for - * events. SetupProc typically calls functions like Tcl_SetMaxBlockTime - * to indicate what to wait for. - * - * CheckProc is called after select or whatever operation was actually - * used to wait. It figures out whether anything interesting actually - * happened (e.g. by calling Tcl_AsyncReady), and then calls - * Tcl_QueueEvent to queue any events that are ready. - * - * Each of these functions is passed two arguments, e.g. - * (*checkProc)(ClientData clientData, int flags)); - * ClientData is the same as the clientData argument here, and flags is a - * combination of things like TCL_FILE_EVENTS that indicates what events - * are of interest: setupProc and checkProc use flags to figure out - * whether their events are relevant or not. - * - *---------------------------------------------------------------------- - */ - -void -Tcl_CreateEventSource( - Tcl_EventSetupProc *setupProc, - /* Function to invoke to figure out what to - * wait for. */ - Tcl_EventCheckProc *checkProc, - /* Function to call after waiting to see what - * happened. */ - ClientData clientData) /* One-word argument to pass to setupProc and - * checkProc. */ -{ - ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); - EventSource *sourcePtr = ckalloc(sizeof(EventSource)); - - sourcePtr->setupProc = setupProc; - sourcePtr->checkProc = checkProc; - sourcePtr->clientData = clientData; - sourcePtr->nextPtr = tsdPtr->firstEventSourcePtr; - tsdPtr->firstEventSourcePtr = sourcePtr; -} - -/* - *---------------------------------------------------------------------- - * - * Tcl_DeleteEventSource -- - * - * This function is invoked to delete the source of events given by proc - * and clientData. - * - * Results: - * None. - * - * Side effects: - * The given event source is canceled, so its function will never again - * be called. If no such source exists, nothing happens. - * - *---------------------------------------------------------------------- - */ - -void -Tcl_DeleteEventSource( - Tcl_EventSetupProc *setupProc, - /* Function to invoke to figure out what to - * wait for. */ - Tcl_EventCheckProc *checkProc, - /* Function to call after waiting to see what - * happened. */ - ClientData clientData) /* One-word argument to pass to setupProc and - * checkProc. */ -{ - ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); - EventSource *sourcePtr, *prevPtr; - - for (sourcePtr = tsdPtr->firstEventSourcePtr, prevPtr = NULL; - sourcePtr != NULL; - prevPtr = sourcePtr, sourcePtr = sourcePtr->nextPtr) { - if ((sourcePtr->setupProc != setupProc) - || (sourcePtr->checkProc != checkProc) - || (sourcePtr->clientData != clientData)) { - continue; - } - if (prevPtr == NULL) { - tsdPtr->firstEventSourcePtr = sourcePtr->nextPtr; - } else { - prevPtr->nextPtr = sourcePtr->nextPtr; - } - ckfree(sourcePtr); - return; - } -} - -/* - *---------------------------------------------------------------------- - * - * Tcl_QueueEvent -- - * - * Queue an event on the event queue associated with the current thread. - * - * Results: - * None. - * - * Side effects: - * None. - * - *---------------------------------------------------------------------- - */ - -void -Tcl_QueueEvent( - Tcl_Event *evPtr, /* Event to add to queue. The storage space - * must have been allocated the caller with - * malloc (ckalloc), and it becomes the - * property of the event queue. It will be - * freed after the event has been handled. */ - Tcl_QueuePosition position) /* One of TCL_QUEUE_TAIL, TCL_QUEUE_HEAD, - * TCL_QUEUE_MARK. */ -{ - ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); - - QueueEvent(tsdPtr, evPtr, position); -} - -/* - *---------------------------------------------------------------------- - * - * Tcl_ThreadQueueEvent -- - * - * Queue an event on the specified thread's event queue. - * - * Results: - * None. - * - * Side effects: - * None. - * - *---------------------------------------------------------------------- - */ - -void -Tcl_ThreadQueueEvent( - Tcl_ThreadId threadId, /* Identifier for thread to use. */ - Tcl_Event *evPtr, /* Event to add to queue. The storage space - * must have been allocated the caller with - * malloc (ckalloc), and it becomes the - * property of the event queue. It will be - * freed after the event has been handled. */ - Tcl_QueuePosition position) /* One of TCL_QUEUE_TAIL, TCL_QUEUE_HEAD, - * TCL_QUEUE_MARK. */ -{ - ThreadSpecificData *tsdPtr; - - /* - * Find the notifier associated with the specified thread. - */ - - Tcl_MutexLock(&listLock); - for (tsdPtr = firstNotifierPtr; tsdPtr && tsdPtr->threadId != threadId; - tsdPtr = tsdPtr->nextPtr) { - /* Empty loop body. */ - } - - /* - * Queue the event if there was a notifier associated with the thread. - */ - - if (tsdPtr) { - QueueEvent(tsdPtr, evPtr, position); - } else { - ckfree(evPtr); - } - Tcl_MutexUnlock(&listLock); -} - -/* - *---------------------------------------------------------------------- - * - * QueueEvent -- - * - * Insert an event into the specified thread's event queue at one of - * three positions: the head, the tail, or before a floating marker. - * Events inserted before the marker will be processed in first-in- - * first-out order, but before any events inserted at the tail of the - * queue. Events inserted at the head of the queue will be processed in - * last-in-first-out order. - * - * Results: - * None. - * - * Side effects: - * None. - * - *---------------------------------------------------------------------- - */ - -static void -QueueEvent( - ThreadSpecificData *tsdPtr, /* Handle to thread local data that indicates - * which event queue to use. */ - Tcl_Event *evPtr, /* Event to add to queue. The storage space - * must have been allocated the caller with - * malloc (ckalloc), and it becomes the - * property of the event queue. It will be - * freed after the event has been handled. */ - Tcl_QueuePosition position) /* One of TCL_QUEUE_TAIL, TCL_QUEUE_HEAD, - * TCL_QUEUE_MARK. */ -{ - Tcl_MutexLock(&(tsdPtr->queueMutex)); - if (position == TCL_QUEUE_TAIL) { - /* - * Append the event on the end of the queue. - */ - - evPtr->nextPtr = NULL; - if (tsdPtr->firstEventPtr == NULL) { - tsdPtr->firstEventPtr = evPtr; - } else { - tsdPtr->lastEventPtr->nextPtr = evPtr; - } - tsdPtr->lastEventPtr = evPtr; - } else if (position == TCL_QUEUE_HEAD) { - /* - * Push the event on the head of the queue. - */ - - evPtr->nextPtr = tsdPtr->firstEventPtr; - if (tsdPtr->firstEventPtr == NULL) { - tsdPtr->lastEventPtr = evPtr; - } - tsdPtr->firstEventPtr = evPtr; - } else if (position == TCL_QUEUE_MARK) { - /* - * Insert the event after the current marker event and advance the - * marker to the new event. - */ - - if (tsdPtr->markerEventPtr == NULL) { - evPtr->nextPtr = tsdPtr->firstEventPtr; - tsdPtr->firstEventPtr = evPtr; - } else { - evPtr->nextPtr = tsdPtr->markerEventPtr->nextPtr; - tsdPtr->markerEventPtr->nextPtr = evPtr; - } - tsdPtr->markerEventPtr = evPtr; - if (evPtr->nextPtr == NULL) { - tsdPtr->lastEventPtr = evPtr; - } - } - Tcl_MutexUnlock(&(tsdPtr->queueMutex)); -} - -/* - *---------------------------------------------------------------------- - * - * Tcl_DeleteEvents -- - * - * Calls a function for each event in the queue and deletes those for - * which the function returns 1. Events for which the function returns 0 - * are left in the queue. Operates on the queue associated with the - * current thread. - * - * Results: - * None. - * - * Side effects: - * Potentially removes one or more events from the event queue. - * - *---------------------------------------------------------------------- - */ - -void -Tcl_DeleteEvents( - Tcl_EventDeleteProc *proc, /* The function to call. */ - ClientData clientData) /* The type-specific data. */ -{ - Tcl_Event *evPtr; /* Pointer to the event being examined */ - Tcl_Event *prevPtr; /* Pointer to evPtr's predecessor, or NULL if - * evPtr designates the first event in the - * queue for the thread. */ - Tcl_Event *hold; - ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); - - Tcl_MutexLock(&(tsdPtr->queueMutex)); - - /* - * Walk the queue of events for the thread, applying 'proc' to each to - * decide whether to eliminate the event. - */ - - prevPtr = NULL; - evPtr = tsdPtr->firstEventPtr; - while (evPtr != NULL) { - if (proc(evPtr, clientData) == 1) { - /* - * This event should be deleted. Unlink it. - */ - - if (prevPtr == NULL) { - tsdPtr->firstEventPtr = evPtr->nextPtr; - } else { - prevPtr->nextPtr = evPtr->nextPtr; - } - - /* - * Update 'last' and 'marker' events if either has been deleted. - */ - - if (evPtr->nextPtr == NULL) { - tsdPtr->lastEventPtr = prevPtr; - } - if (tsdPtr->markerEventPtr == evPtr) { - tsdPtr->markerEventPtr = prevPtr; - } - - /* - * Delete the event data structure. - */ - - hold = evPtr; - evPtr = evPtr->nextPtr; - ckfree(hold); - } else { - /* - * Event is to be retained. - */ - - prevPtr = evPtr; - evPtr = evPtr->nextPtr; - } - } - Tcl_MutexUnlock(&(tsdPtr->queueMutex)); -} - -/* - *---------------------------------------------------------------------- - * - * Tcl_ServiceEvent -- - * - * Process one event from the event queue, or invoke an asynchronous - * event handler. Operates on event queue for current thread. - * - * Results: - * The return value is 1 if the function actually found an event to - * process. If no processing occurred, then 0 is returned. - * - * Side effects: - * Invokes all of the event handlers for the highest priority event in - * the event queue. May collapse some events into a single event or - * discard stale events. - * - *---------------------------------------------------------------------- - */ - -int -Tcl_ServiceEvent( - int flags) /* Indicates what events should be processed. - * May be any combination of TCL_WINDOW_EVENTS - * TCL_FILE_EVENTS, TCL_TIMER_EVENTS, or other - * flags defined elsewhere. Events not - * matching this will be skipped for - * processing later. */ -{ - Tcl_Event *evPtr, *prevPtr; - Tcl_EventProc *proc; - int result; - ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); - - /* - * Asynchronous event handlers are considered to be the highest priority - * events, and so must be invoked before we process events on the event - * queue. - */ - - if (Tcl_AsyncReady()) { - (void) Tcl_AsyncInvoke(NULL, 0); - return 1; - } - - /* - * No event flags is equivalent to TCL_ALL_EVENTS. - */ - - if ((flags & TCL_ALL_EVENTS) == 0) { - flags |= TCL_ALL_EVENTS; - } - - /* - * Loop through all the events in the queue until we find one that can - * actually be handled. - */ - - Tcl_MutexLock(&(tsdPtr->queueMutex)); - for (evPtr = tsdPtr->firstEventPtr; evPtr != NULL; - evPtr = evPtr->nextPtr) { - /* - * Call the handler for the event. If it actually handles the event - * then free the storage for the event. There are two tricky things - * here, both stemming from the fact that the event code may be - * re-entered while servicing the event: - * - * 1. Set the "proc" field to NULL. This is a signal to ourselves - * that we shouldn't reexecute the handler if the event loop is - * re-entered. - * 2. When freeing the event, must search the queue again from the - * front to find it. This is because the event queue could change - * almost arbitrarily while handling the event, so we can't depend - * on pointers found now still being valid when the handler - * returns. - */ - - proc = evPtr->proc; - if (proc == NULL) { - continue; - } - evPtr->proc = NULL; - - /* - * Release the lock before calling the event function. This allows - * other threads to post events if we enter a recursive event loop in - * this thread. Note that we are making the assumption that if the - * proc returns 0, the event is still in the list. - */ - - Tcl_MutexUnlock(&(tsdPtr->queueMutex)); - result = proc(evPtr, flags); - Tcl_MutexLock(&(tsdPtr->queueMutex)); - - if (result) { - /* - * The event was processed, so remove it from the queue. - */ - - if (tsdPtr->firstEventPtr == evPtr) { - tsdPtr->firstEventPtr = evPtr->nextPtr; - if (evPtr->nextPtr == NULL) { - tsdPtr->lastEventPtr = NULL; - } - if (tsdPtr->markerEventPtr == evPtr) { - tsdPtr->markerEventPtr = NULL; - } - } else { - for (prevPtr = tsdPtr->firstEventPtr; - prevPtr && prevPtr->nextPtr != evPtr; - prevPtr = prevPtr->nextPtr) { - /* Empty loop body. */ - } - if (prevPtr) { - prevPtr->nextPtr = evPtr->nextPtr; - if (evPtr->nextPtr == NULL) { - tsdPtr->lastEventPtr = prevPtr; - } - if (tsdPtr->markerEventPtr == evPtr) { - tsdPtr->markerEventPtr = prevPtr; - } - } else { - evPtr = NULL; - } - } - if (evPtr) { - ckfree(evPtr); - } - Tcl_MutexUnlock(&(tsdPtr->queueMutex)); - return 1; - } else { - /* - * The event wasn't actually handled, so we have to restore the - * proc field to allow the event to be attempted again. - */ - - evPtr->proc = proc; - } - } - Tcl_MutexUnlock(&(tsdPtr->queueMutex)); - return 0; -} - -/* - *---------------------------------------------------------------------- - * - * Tcl_GetServiceMode -- - * - * This routine returns the current service mode of the notifier. - * - * Results: - * Returns either TCL_SERVICE_ALL or TCL_SERVICE_NONE. - * - * Side effects: - * None. - * - *---------------------------------------------------------------------- - */ - -int -Tcl_GetServiceMode(void) -{ - ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); - - return tsdPtr->serviceMode; -} - -/* - *---------------------------------------------------------------------- - * - * Tcl_SetServiceMode -- - * - * This routine sets the current service mode of the tsdPtr-> - * - * Results: - * Returns the previous service mode. - * - * Side effects: - * Invokes the notifier service mode hook function. - * - *---------------------------------------------------------------------- - */ - -int -Tcl_SetServiceMode( - int mode) /* New service mode: TCL_SERVICE_ALL or - * TCL_SERVICE_NONE */ -{ - int oldMode; - ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); - - oldMode = tsdPtr->serviceMode; - tsdPtr->serviceMode = mode; - Tcl_ServiceModeHook(mode); - return oldMode; -} - -/* - *---------------------------------------------------------------------- - * - * Tcl_SetMaxBlockTime -- - * - * This function is invoked by event sources to tell the notifier how - * long it may block the next time it blocks. The timePtr argument gives - * a maximum time; the actual time may be less if some other event source - * requested a smaller time. - * - * Results: - * None. - * - * Side effects: - * May reduce the length of the next sleep in the tsdPtr-> - * - *---------------------------------------------------------------------- - */ - -void -Tcl_SetMaxBlockTime( - const Tcl_Time *timePtr) /* Specifies a maximum elapsed time for the - * next blocking operation in the event - * tsdPtr-> */ -{ - ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); - - if (!tsdPtr->blockTimeSet || (timePtr->sec < tsdPtr->blockTime.sec) - || ((timePtr->sec == tsdPtr->blockTime.sec) - && (timePtr->usec < tsdPtr->blockTime.usec))) { - tsdPtr->blockTime = *timePtr; - tsdPtr->blockTimeSet = 1; - } - - /* - * If we are called outside an event source traversal, set the timeout - * immediately. - */ - - if (!tsdPtr->inTraversal) { - Tcl_SetTimer(&tsdPtr->blockTime); - } -} - -/* - *---------------------------------------------------------------------- - * - * Tcl_DoOneEvent -- - * - * Process a single event of some sort. If there's no work to do, wait - * for an event to occur, then process it. - * - * Results: - * The return value is 1 if the function actually found an event to - * process. If no processing occurred, then 0 is returned (this can - * happen if the TCL_DONT_WAIT flag is set or if there are no event - * handlers to wait for in the set specified by flags). - * - * Side effects: - * May delay execution of process while waiting for an event, unless - * TCL_DONT_WAIT is set in the flags argument. Event sources are invoked - * to check for and queue events. Event handlers may produce arbitrary - * side effects. - * - *---------------------------------------------------------------------- - */ - -int -Tcl_DoOneEvent( - int flags) /* Miscellaneous flag values: may be any - * combination of TCL_DONT_WAIT, - * TCL_WINDOW_EVENTS, TCL_FILE_EVENTS, - * TCL_TIMER_EVENTS, TCL_IDLE_EVENTS, or - * others defined by event sources. */ -{ - int result = 0, oldMode; - EventSource *sourcePtr; - Tcl_Time *timePtr; - ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); - - /* - * The first thing we do is to service any asynchronous event handlers. - */ - - if (Tcl_AsyncReady()) { - (void) Tcl_AsyncInvoke(NULL, 0); - return 1; - } - - /* - * No event flags is equivalent to TCL_ALL_EVENTS. - */ - - if ((flags & TCL_ALL_EVENTS) == 0) { - flags |= TCL_ALL_EVENTS; - } - - /* - * Set the service mode to none so notifier event routines won't try to - * service events recursively. - */ - - oldMode = tsdPtr->serviceMode; - tsdPtr->serviceMode = TCL_SERVICE_NONE; - - /* - * The core of this function is an infinite loop, even though we only - * service one event. The reason for this is that we may be processing - * events that don't do anything inside of Tcl. - */ - - while (1) { - /* - * If idle events are the only things to service, skip the main part - * of the loop and go directly to handle idle events (i.e. don't wait - * even if TCL_DONT_WAIT isn't set). - */ - - if ((flags & TCL_ALL_EVENTS) == TCL_IDLE_EVENTS) { - flags = TCL_IDLE_EVENTS | TCL_DONT_WAIT; - goto idleEvents; - } - - /* - * Ask Tcl to service a queued event, if there are any. - */ - - if (Tcl_ServiceEvent(flags)) { - result = 1; - break; - } - - /* - * If TCL_DONT_WAIT is set, be sure to poll rather than blocking, - * otherwise reset the block time to infinity. - */ - - if (flags & TCL_DONT_WAIT) { - tsdPtr->blockTime.sec = 0; - tsdPtr->blockTime.usec = 0; - tsdPtr->blockTimeSet = 1; - } else { - tsdPtr->blockTimeSet = 0; - } - - /* - * Set up all the event sources for new events. This will cause the - * block time to be updated if necessary. - */ - - tsdPtr->inTraversal = 1; - for (sourcePtr = tsdPtr->firstEventSourcePtr; sourcePtr != NULL; - sourcePtr = sourcePtr->nextPtr) { - if (sourcePtr->setupProc) { - sourcePtr->setupProc(sourcePtr->clientData, flags); - } - } - tsdPtr->inTraversal = 0; - - if ((flags & TCL_DONT_WAIT) || tsdPtr->blockTimeSet) { - timePtr = &tsdPtr->blockTime; - } else { - timePtr = NULL; - } - - /* - * Wait for a new event or a timeout. If Tcl_WaitForEvent returns -1, - * we should abort Tcl_DoOneEvent. - */ - - result = Tcl_WaitForEvent(timePtr); - if (result < 0) { - result = 0; - break; - } - - /* - * Check all the event sources for new events. - */ - - for (sourcePtr = tsdPtr->firstEventSourcePtr; sourcePtr != NULL; - sourcePtr = sourcePtr->nextPtr) { - if (sourcePtr->checkProc) { - sourcePtr->checkProc(sourcePtr->clientData, flags); - } - } - - /* - * Check for events queued by the notifier or event sources. - */ - - if (Tcl_ServiceEvent(flags)) { - result = 1; - break; - } - - /* - * We've tried everything at this point, but nobody we know about had - * anything to do. Check for idle events. If none, either quit or go - * back to the top and try again. - */ - - idleEvents: - if (flags & TCL_IDLE_EVENTS) { - if (TclServiceIdle()) { - result = 1; - break; - } - } - if (flags & TCL_DONT_WAIT) { - break; - } - - /* - * If Tcl_WaitForEvent has returned 1, indicating that one system - * event has been dispatched (and thus that some Tcl code might have - * been indirectly executed), we break out of the loop. We do this to - * give VwaitCmd for instance a chance to check if that system event - * had the side effect of changing the variable (so the vwait can - * return and unwind properly). - * - * NB: We will process idle events if any first, because otherwise we - * might never do the idle events if the notifier always gets - * system events. - */ - - if (result) { - break; - } - } - - tsdPtr->serviceMode = oldMode; - return result; -} - -/* - *---------------------------------------------------------------------- - * - * Tcl_ServiceAll -- - * - * This routine checks all of the event sources, processes events that - * are on the Tcl event queue, and then calls the any idle handlers. - * Platform specific notifier callbacks that generate events should call - * this routine before returning to the system in order to ensure that - * Tcl gets a chance to process the new events. - * - * Results: - * Returns 1 if an event or idle handler was invoked, else 0. - * - * Side effects: - * Anything that an event or idle handler may do. - * - *---------------------------------------------------------------------- - */ - -int -Tcl_ServiceAll(void) -{ - int result = 0; - EventSource *sourcePtr; - ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); - - if (tsdPtr->serviceMode == TCL_SERVICE_NONE) { - return result; - } - - /* - * We need to turn off event servicing like we to in Tcl_DoOneEvent, to - * avoid recursive calls. - */ - - tsdPtr->serviceMode = TCL_SERVICE_NONE; - - /* - * Check async handlers first. - */ - - if (Tcl_AsyncReady()) { - (void) Tcl_AsyncInvoke(NULL, 0); - } - - /* - * Make a single pass through all event sources, queued events, and idle - * handlers. Note that we wait to update the notifier timer until the end - * so we can avoid multiple changes. - */ - - tsdPtr->inTraversal = 1; - tsdPtr->blockTimeSet = 0; - - for (sourcePtr = tsdPtr->firstEventSourcePtr; sourcePtr != NULL; - sourcePtr = sourcePtr->nextPtr) { - if (sourcePtr->setupProc) { - sourcePtr->setupProc(sourcePtr->clientData, TCL_ALL_EVENTS); - } - } - for (sourcePtr = tsdPtr->firstEventSourcePtr; sourcePtr != NULL; - sourcePtr = sourcePtr->nextPtr) { - if (sourcePtr->checkProc) { - sourcePtr->checkProc(sourcePtr->clientData, TCL_ALL_EVENTS); - } - } - - while (Tcl_ServiceEvent(0)) { - result = 1; - } - if (TclServiceIdle()) { - result = 1; - } - - if (!tsdPtr->blockTimeSet) { - Tcl_SetTimer(NULL); - } else { - Tcl_SetTimer(&tsdPtr->blockTime); - } - tsdPtr->inTraversal = 0; - tsdPtr->serviceMode = TCL_SERVICE_ALL; - return result; -} - -/* - *---------------------------------------------------------------------- - * - * Tcl_ThreadAlert -- - * - * This function wakes up the notifier associated with the specified - * thread (if there is one). - * - * Results: - * None. - * - * Side effects: - * None. - * - *---------------------------------------------------------------------- - */ - -void -Tcl_ThreadAlert( - Tcl_ThreadId threadId) /* Identifier for thread to use. */ -{ - ThreadSpecificData *tsdPtr; - - /* - * Find the notifier associated with the specified thread. Note that we - * need to hold the listLock while calling Tcl_AlertNotifier to avoid a - * race condition where the specified thread might destroy its notifier. - */ - - Tcl_MutexLock(&listLock); - for (tsdPtr = firstNotifierPtr; tsdPtr; tsdPtr = tsdPtr->nextPtr) { - if (tsdPtr->threadId == threadId) { - Tcl_AlertNotifier(tsdPtr->clientData); - break; - } - } - Tcl_MutexUnlock(&listLock); -} - -/* - * Local Variables: - * mode: c - * c-basic-offset: 4 - * fill-column: 78 - * End: - */ |