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Martin v. Löwis 2002-12-11 19:55:48 +00:00
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39
Modules/license.terms
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@ -1,39 +0,0 @@
This software is copyrighted by the Regents of the University of
California, Sun Microsystems, Inc., and other parties. The following
terms apply to all files associated with the software unless explicitly
disclaimed in individual files.
The authors hereby grant permission to use, copy, modify, distribute,
and license this software and its documentation for any purpose, provided
that existing copyright notices are retained in all copies and that this
notice is included verbatim in any distributions. No written agreement,
license, or royalty fee is required for any of the authorized uses.
Modifications to this software may be copyrighted by their authors
and need not follow the licensing terms described here, provided that
the new terms are clearly indicated on the first page of each file where
they apply.
IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY PARTY
FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION, OR ANY
DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT. THIS SOFTWARE
IS PROVIDED ON AN "AS IS" BASIS, AND THE AUTHORS AND DISTRIBUTORS HAVE
NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR
MODIFICATIONS.
GOVERNMENT USE: If you are acquiring this software on behalf of the
U.S. government, the Government shall have only "Restricted Rights"
in the software and related documentation as defined in the Federal
Acquisition Regulations (FARs) in Clause 52.227.19 (c) (2). If you
are acquiring the software on behalf of the Department of Defense, the
software shall be classified as "Commercial Computer Software" and the
Government shall have only "Restricted Rights" as defined in Clause
252.227-7013 (c) (1) of DFARs. Notwithstanding the foregoing, the
authors grant the U.S. Government and others acting in its behalf
permission to use and distribute the software in accordance with the
terms specified in this license.

964
Modules/tclNotify.c
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/*
* This is a modified version of tclNotify.c from Sun's Tcl 8.0
* distribution. The purpose of the modification is to provide an
* interface to the internals of the notifier that make it possible to
* write safe multi-threaded Python programs that use Tkinter.
*
* Original comments follow. The file license.terms from the Tcl 8.0
* distribution is contained in this directory, as required.
*/
/*
* 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.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* SCCS: @(#) tclNotify.c 1.15 97/06/18 17:14:04
*/
#include "tclInt.h"
#include "tclPort.h"
/*
* The following static indicates whether this module has been initialized.
*/
static int initialized = 0;
/*
* 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.
* 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).
*/
static struct {
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. */
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
* global list of event sources. */
} notifier;
/*
* Declarations for functions used in this file.
*/
static void InitNotifier _ANSI_ARGS_((void));
static void NotifierExitHandler _ANSI_ARGS_((ClientData clientData));
/*
*----------------------------------------------------------------------
*
* InitNotifier --
*
* This routine is called to initialize the notifier module.
*
* Results:
* None.
*
* Side effects:
* Creates an exit handler and initializes static data.
*
*----------------------------------------------------------------------
*/
static void
InitNotifier(void)
{
initialized = 1;
memset(&notifier, 0, sizeof(notifier));
notifier.serviceMode = TCL_SERVICE_NONE;
Tcl_CreateExitHandler(NotifierExitHandler, NULL);
}
/*
*----------------------------------------------------------------------
*
* NotifierExitHandler --
*
* This routine is called during Tcl finalization.
*
* Results:
* None.
*
* Side effects:
* Clears the notifier initialization flag.
*
*----------------------------------------------------------------------
*/
static void
NotifierExitHandler(clientData)
ClientData clientData; /* Not used. */
{
initialized = 0;
}
/*
*----------------------------------------------------------------------
*
* Tcl_CreateEventSource --
*
* This procedure is invoked to create a new source of events.
* The source is identified by a procedure 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_WatchFile
* or 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_FileReady), and then calls
* Tcl_QueueEvent to queue any events that are ready.
*
* Each of these procedures 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(setupProc, checkProc, clientData)
Tcl_EventSetupProc *setupProc; /* Procedure to invoke to figure out
* what to wait for. */
Tcl_EventCheckProc *checkProc; /* Procedure to call after waiting
* to see what happened. */
ClientData clientData; /* One-word argument to pass to
* setupProc and checkProc. */
{
EventSource *sourcePtr;
if (!initialized) {
InitNotifier();
}
sourcePtr = (EventSource *) ckalloc(sizeof(EventSource));
sourcePtr->setupProc = setupProc;
sourcePtr->checkProc = checkProc;
sourcePtr->clientData = clientData;
sourcePtr->nextPtr = notifier.firstEventSourcePtr;
notifier.firstEventSourcePtr = sourcePtr;
}
/*
*----------------------------------------------------------------------
*
* Tcl_DeleteEventSource --
*
* This procedure 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 procedure will
* never again be called. If no such source exists, nothing
* happens.
*
*----------------------------------------------------------------------
*/
void
Tcl_DeleteEventSource(setupProc, checkProc, clientData)
Tcl_EventSetupProc *setupProc; /* Procedure to invoke to figure out
* what to wait for. */
Tcl_EventCheckProc *checkProc; /* Procedure to call after waiting
* to see what happened. */
ClientData clientData; /* One-word argument to pass to
* setupProc and checkProc. */
{
EventSource *sourcePtr, *prevPtr;
for (sourcePtr = notifier.firstEventSourcePtr, prevPtr = NULL;
sourcePtr != NULL;
prevPtr = sourcePtr, sourcePtr = sourcePtr->nextPtr) {
if ((sourcePtr->setupProc != setupProc)
|| (sourcePtr->checkProc != checkProc)
|| (sourcePtr->clientData != clientData)) {
continue;
}
if (prevPtr == NULL) {
notifier.firstEventSourcePtr = sourcePtr->nextPtr;
} else {
prevPtr->nextPtr = sourcePtr->nextPtr;
}
ckfree((char *) sourcePtr);
return;
}
}
/*
*----------------------------------------------------------------------
*
* Tcl_QueueEvent --
*
* Insert an event into the Tk 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.
*
*----------------------------------------------------------------------
*/
void
Tcl_QueueEvent(evPtr, position)
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. */
{
if (!initialized) {
InitNotifier();
}
if (position == TCL_QUEUE_TAIL) {
/*
* Append the event on the end of the queue.
*/
evPtr->nextPtr = NULL;
if (notifier.firstEventPtr == NULL) {
notifier.firstEventPtr = evPtr;
} else {
notifier.lastEventPtr->nextPtr = evPtr;
}
notifier.lastEventPtr = evPtr;
} else if (position == TCL_QUEUE_HEAD) {
/*
* Push the event on the head of the queue.
*/
evPtr->nextPtr = notifier.firstEventPtr;
if (notifier.firstEventPtr == NULL) {
notifier.lastEventPtr = evPtr;
}
notifier.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 (notifier.markerEventPtr == NULL) {
evPtr->nextPtr = notifier.firstEventPtr;
notifier.firstEventPtr = evPtr;
} else {
evPtr->nextPtr = notifier.markerEventPtr->nextPtr;
notifier.markerEventPtr->nextPtr = evPtr;
}
notifier.markerEventPtr = evPtr;
if (evPtr->nextPtr == NULL) {
notifier.lastEventPtr = evPtr;
}
}
}
/*
*----------------------------------------------------------------------
*
* Tcl_DeleteEvents --
*
* Calls a procedure for each event in the queue and deletes those
* for which the procedure returns 1. Events for which the
* procedure returns 0 are left in the queue.
*
* Results:
* None.
*
* Side effects:
* Potentially removes one or more events from the event queue.
*
*----------------------------------------------------------------------
*/
void
Tcl_DeleteEvents(proc, clientData)
Tcl_EventDeleteProc *proc; /* The procedure to call. */
ClientData clientData; /* type-specific data. */
{
Tcl_Event *evPtr, *prevPtr, *hold;
if (!initialized) {
InitNotifier();
}
for (prevPtr = (Tcl_Event *) NULL, evPtr = notifier.firstEventPtr;
evPtr != (Tcl_Event *) NULL;
) {
if ((*proc) (evPtr, clientData) == 1) {
if (notifier.firstEventPtr == evPtr) {
notifier.firstEventPtr = evPtr->nextPtr;
if (evPtr->nextPtr == (Tcl_Event *) NULL) {
notifier.lastEventPtr = (Tcl_Event *) NULL;
}
} else {
prevPtr->nextPtr = evPtr->nextPtr;
}
hold = evPtr;
evPtr = evPtr->nextPtr;
ckfree((char *) hold);
} else {
prevPtr = evPtr;
evPtr = evPtr->nextPtr;
}
}
}
/*
*----------------------------------------------------------------------
*
* Tcl_ServiceEvent --
*
* Process one event from the event queue, or invoke an
* asynchronous event handler.
*
* Results:
* The return value is 1 if the procedure 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(flags)
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;
if (!initialized) {
InitNotifier();
}
/*
* 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((Tcl_Interp *) 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.
*/
for (evPtr = notifier.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, but 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;
evPtr->proc = NULL;
if ((proc != NULL) && (*proc)(evPtr, flags)) {
if (notifier.firstEventPtr == evPtr) {
notifier.firstEventPtr = evPtr->nextPtr;
if (evPtr->nextPtr == NULL) {
notifier.lastEventPtr = NULL;
}
if (notifier.markerEventPtr == evPtr) {
notifier.markerEventPtr = NULL;
}
} else {
for (prevPtr = notifier.firstEventPtr;
prevPtr->nextPtr != evPtr; prevPtr = prevPtr->nextPtr) {
/* Empty loop body. */
}
prevPtr->nextPtr = evPtr->nextPtr;
if (evPtr->nextPtr == NULL) {
notifier.lastEventPtr = prevPtr;
}
if (notifier.markerEventPtr == evPtr) {
notifier.markerEventPtr = prevPtr;
}
}
ckfree((char *) evPtr);
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;
}
/*
* The handler for this event asked to defer it. Just go on to
* the next event.
*/
continue;
}
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)
{
if (!initialized) {
InitNotifier();
}
return notifier.serviceMode;
}
/*
*----------------------------------------------------------------------
*
* Tcl_SetServiceMode --
*
* This routine sets the current service mode of the notifier.
*
* Results:
* Returns the previous service mode.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
Tcl_SetServiceMode(mode)
int mode; /* New service mode: TCL_SERVICE_ALL or
* TCL_SERVICE_NONE */
{
int oldMode;
if (!initialized) {
InitNotifier();
}
oldMode = notifier.serviceMode;
notifier.serviceMode = mode;
return oldMode;
}
/*
*----------------------------------------------------------------------
*
* Tcl_SetMaxBlockTime --
*
* This procedure 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 notifier.
*
*----------------------------------------------------------------------
*/
void
Tcl_SetMaxBlockTime(timePtr)
Tcl_Time *timePtr; /* Specifies a maximum elapsed time for
* the next blocking operation in the
* event notifier. */
{
if (!initialized) {
InitNotifier();
}
if (!notifier.blockTimeSet || (timePtr->sec < notifier.blockTime.sec)
|| ((timePtr->sec == notifier.blockTime.sec)
&& (timePtr->usec < notifier.blockTime.usec))) {
notifier.blockTime = *timePtr;
notifier.blockTimeSet = 1;
}
/*
* If we are called outside an event source traversal, set the
* timeout immediately.
*/
if (!notifier.inTraversal) {
if (notifier.blockTimeSet) {
Tcl_SetTimer(&notifier.blockTime);
} else {
Tcl_SetTimer(NULL);
}
}
}
/*
*----------------------------------------------------------------------
*
* 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 procedure 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(flags)
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;
if (!initialized) {
InitNotifier();
}
/*
* The first thing we do is to service any asynchronous event
* handlers.
*/
if (Tcl_AsyncReady()) {
(void) Tcl_AsyncInvoke((Tcl_Interp *) 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 = notifier.serviceMode;
notifier.serviceMode = TCL_SERVICE_NONE;
/*
* The core of this procedure 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) {
notifier.blockTime.sec = 0;
notifier.blockTime.usec = 0;
notifier.blockTimeSet = 1;
} else {
notifier.blockTimeSet = 0;
}
/*
* Set up all the event sources for new events. This will
* cause the block time to be updated if necessary.
*/
notifier.inTraversal = 1;
for (sourcePtr = notifier.firstEventSourcePtr; sourcePtr != NULL;
sourcePtr = sourcePtr->nextPtr) {
if (sourcePtr->setupProc) {
(sourcePtr->setupProc)(sourcePtr->clientData, flags);
}
}
notifier.inTraversal = 0;
if ((flags & TCL_DONT_WAIT) || notifier.blockTimeSet) {
timePtr = &notifier.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 = notifier.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;
}
}
notifier.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;
if (!initialized) {
InitNotifier();
}
if (notifier.serviceMode == TCL_SERVICE_NONE) {
return result;
}
/*
* We need to turn off event servicing like we to in Tcl_DoOneEvent,
* to avoid recursive calls.
*/
notifier.serviceMode = TCL_SERVICE_NONE;
/*
* Check async handlers first.
*/
if (Tcl_AsyncReady()) {
(void) Tcl_AsyncInvoke((Tcl_Interp *) 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.
*/
notifier.inTraversal = 1;
notifier.blockTimeSet = 0;
for (sourcePtr = notifier.firstEventSourcePtr; sourcePtr != NULL;
sourcePtr = sourcePtr->nextPtr) {
if (sourcePtr->setupProc) {
(sourcePtr->setupProc)(sourcePtr->clientData, TCL_ALL_EVENTS);
}
}
for (sourcePtr = notifier.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 (!notifier.blockTimeSet) {
Tcl_SetTimer(NULL);
} else {
Tcl_SetTimer(&notifier.blockTime);
}
notifier.inTraversal = 0;
notifier.serviceMode = TCL_SERVICE_ALL;
return result;
}
/*
*----------------------------------------------------------------------
*
* PyTcl_WaitUntilEvent --
*
* New function to wait until a Tcl event is ready without
* actually handling the event. This is different than
* TclWaitForEvent(): that function doesn't call the event
* check routines, which is necessary for our purpose.
* We also can't use Tcl_DoOneEvent(TCL_DONT_WAIT), since that
* does too much: it handles the event. We want the *handling*
* of the event to be done with the Python lock held, but the
* *waiting* with the lock released.
*
* Since the event administration is not exported, our only
* choice is to use a modified copy of the file tclNotify.c,
* containing this additional function that makes the desired
* functionality available. It is mostly a stripped down version
* of the code in Tcl_DoOneEvent().
*
* This requires that you link with a static version of the Tcl
* library. On Windows/Mac, a custom compilation of Tcl may be
* required (I haven't tried this yet).
*
*----------------------------------------------------------------------
*/
int
PyTcl_WaitUntilEvent(void)
{
int flags = TCL_ALL_EVENTS;
int result = 0, oldMode;
EventSource *sourcePtr;
Tcl_Time *timePtr;
if (!initialized) {
InitNotifier();
}
/*
* The first thing we do is to service any asynchronous event
* handlers.
*/
if (Tcl_AsyncReady())
return 1;
/*
* Set the service mode to none so notifier event routines won't
* try to service events recursively.
*/
oldMode = notifier.serviceMode;
notifier.serviceMode = TCL_SERVICE_NONE;
notifier.blockTimeSet = 0;
/*
* Set up all the event sources for new events. This will
* cause the block time to be updated if necessary.
*/
notifier.inTraversal = 1;
for (sourcePtr = notifier.firstEventSourcePtr; sourcePtr != NULL;
sourcePtr = sourcePtr->nextPtr) {
if (sourcePtr->setupProc) {
(sourcePtr->setupProc)(sourcePtr->clientData, flags);
}
}
notifier.inTraversal = 0;
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)
return 0;
/*
* Check all the event sources for new events.
*/
for (sourcePtr = notifier.firstEventSourcePtr; sourcePtr != NULL;
sourcePtr = sourcePtr->nextPtr) {
if (sourcePtr->checkProc) {
(sourcePtr->checkProc)(sourcePtr->clientData, flags);
}
}
notifier.serviceMode = oldMode;
return result;
}