8b5086250a
Now that all event queues hold internal events only, they never need to be resized. Resizing them led to memory corruption as they would get sized for an appropriate xEvent, not an internal event. Signed-off-by: Keith Packard <keithp@keithp.com> Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
485 lines
14 KiB
C
485 lines
14 KiB
C
/*
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*
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Copyright 1990, 1998 The Open Group
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from The Open Group.
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*
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* Author: Keith Packard, MIT X Consortium
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*/
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/*
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* mieq.c
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*
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* Machine independent event queue
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*
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*/
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#if HAVE_DIX_CONFIG_H
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#include <dix-config.h>
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#endif
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# include <X11/X.h>
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# include <X11/Xmd.h>
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# include <X11/Xproto.h>
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# include "misc.h"
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# include "windowstr.h"
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# include "pixmapstr.h"
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# include "inputstr.h"
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# include "mi.h"
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# include "mipointer.h"
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# include "scrnintstr.h"
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# include <X11/extensions/XI.h>
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# include <X11/extensions/XIproto.h>
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# include <X11/extensions/geproto.h>
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# include "extinit.h"
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# include "exglobals.h"
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# include "eventstr.h"
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#ifdef DPMSExtension
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# include "dpmsproc.h"
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# include <X11/extensions/dpmsconst.h>
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#endif
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#define QUEUE_SIZE 512
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#define EnqueueScreen(dev) dev->spriteInfo->sprite->pEnqueueScreen
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#define DequeueScreen(dev) dev->spriteInfo->sprite->pDequeueScreen
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typedef struct _Event {
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EventListPtr events;
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ScreenPtr pScreen;
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DeviceIntPtr pDev; /* device this event _originated_ from */
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} EventRec, *EventPtr;
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typedef struct _EventQueue {
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HWEventQueueType head, tail; /* long for SetInputCheck */
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CARD32 lastEventTime; /* to avoid time running backwards */
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int lastMotion; /* device ID if last event motion? */
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EventRec events[QUEUE_SIZE]; /* static allocation for signals */
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mieqHandler handlers[128]; /* custom event handler */
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} EventQueueRec, *EventQueuePtr;
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static EventQueueRec miEventQueue;
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#ifdef XQUARTZ
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#include <pthread.h>
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static pthread_mutex_t miEventQueueMutex = PTHREAD_MUTEX_INITIALIZER;
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extern BOOL serverInitComplete;
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extern pthread_mutex_t serverInitCompleteMutex;
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extern pthread_cond_t serverInitCompleteCond;
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static inline void wait_for_server_init(void) {
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/* If the server hasn't finished initializing, wait for it... */
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if(!serverInitComplete) {
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pthread_mutex_lock(&serverInitCompleteMutex);
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while(!serverInitComplete)
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pthread_cond_wait(&serverInitCompleteCond, &serverInitCompleteMutex);
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pthread_mutex_unlock(&serverInitCompleteMutex);
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}
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}
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#endif
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Bool
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mieqInit(void)
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{
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int i;
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miEventQueue.head = miEventQueue.tail = 0;
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miEventQueue.lastEventTime = GetTimeInMillis ();
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miEventQueue.lastMotion = FALSE;
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for (i = 0; i < 128; i++)
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miEventQueue.handlers[i] = NULL;
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for (i = 0; i < QUEUE_SIZE; i++)
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{
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if (miEventQueue.events[i].events == NULL) {
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EventListPtr evlist = InitEventList(1);
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if (!evlist)
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FatalError("Could not allocate event queue.\n");
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miEventQueue.events[i].events = evlist;
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}
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}
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SetInputCheck(&miEventQueue.head, &miEventQueue.tail);
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return TRUE;
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}
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void
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mieqFini(void)
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{
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int i;
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for (i = 0; i < QUEUE_SIZE; i++)
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{
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if (miEventQueue.events[i].events != NULL) {
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FreeEventList(miEventQueue.events[i].events, 1);
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miEventQueue.events[i].events = NULL;
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}
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}
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}
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/*
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* Must be reentrant with ProcessInputEvents. Assumption: mieqEnqueue
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* will never be interrupted. If this is called from both signal
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* handlers and regular code, make sure the signal is suspended when
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* called from regular code.
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*/
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void
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mieqEnqueue(DeviceIntPtr pDev, InternalEvent *e)
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{
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unsigned int oldtail = miEventQueue.tail;
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EventListPtr evt;
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int isMotion = 0;
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int evlen;
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Time time;
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#ifdef XQUARTZ
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wait_for_server_init();
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pthread_mutex_lock(&miEventQueueMutex);
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#endif
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CHECKEVENT(e);
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/* avoid merging events from different devices */
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if (e->any.type == ET_Motion)
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isMotion = pDev->id;
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if (isMotion && isMotion == miEventQueue.lastMotion &&
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oldtail != miEventQueue.head) {
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oldtail = (oldtail - 1) % QUEUE_SIZE;
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}
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else {
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static int stuck = 0;
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/* Toss events which come in late. Usually this means your server's
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* stuck in an infinite loop somewhere, but SIGIO is still getting
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* handled. */
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if (((oldtail + 1) % QUEUE_SIZE) == miEventQueue.head) {
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if (!stuck) {
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ErrorF("[mi] EQ overflowing. The server is probably stuck "
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"in an infinite loop.\n");
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xorg_backtrace();
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stuck = 1;
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}
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#ifdef XQUARTZ
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pthread_mutex_unlock(&miEventQueueMutex);
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#endif
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return;
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}
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stuck = 0;
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}
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evlen = e->any.length;
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evt = miEventQueue.events[oldtail].events;
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if (evt->evlen < evlen)
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{
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evt->evlen = evlen;
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evt->event = xrealloc(evt->event, evt->evlen);
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if (!evt->event)
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{
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ErrorF("[mi] Running out of memory. Tossing event.\n");
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#ifdef XQUARTZ
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pthread_mutex_unlock(&miEventQueueMutex);
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#endif
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return;
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}
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}
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memcpy(evt->event, e, evlen);
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time = e->any.time;
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/* Make sure that event times don't go backwards - this
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* is "unnecessary", but very useful. */
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if (time < miEventQueue.lastEventTime &&
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miEventQueue.lastEventTime - time < 10000)
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e->any.time = miEventQueue.lastEventTime;
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miEventQueue.lastEventTime = ((InternalEvent*)evt->event)->any.time;
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miEventQueue.events[oldtail].pScreen = pDev ? EnqueueScreen(pDev) : NULL;
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miEventQueue.events[oldtail].pDev = pDev;
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miEventQueue.lastMotion = isMotion;
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miEventQueue.tail = (oldtail + 1) % QUEUE_SIZE;
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#ifdef XQUARTZ
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pthread_mutex_unlock(&miEventQueueMutex);
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#endif
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}
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void
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mieqSwitchScreen(DeviceIntPtr pDev, ScreenPtr pScreen, Bool fromDIX)
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{
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#ifdef XQUARTZ
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pthread_mutex_lock(&miEventQueueMutex);
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#endif
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EnqueueScreen(pDev) = pScreen;
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if (fromDIX)
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DequeueScreen(pDev) = pScreen;
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#ifdef XQUARTZ
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pthread_mutex_unlock(&miEventQueueMutex);
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#endif
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}
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void
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mieqSetHandler(int event, mieqHandler handler)
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{
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#ifdef XQUARTZ
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pthread_mutex_lock(&miEventQueueMutex);
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#endif
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if (handler && miEventQueue.handlers[event])
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ErrorF("[mi] mieq: warning: overriding existing handler %p with %p for "
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"event %d\n", miEventQueue.handlers[event], handler, event);
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miEventQueue.handlers[event] = handler;
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#ifdef XQUARTZ
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pthread_mutex_unlock(&miEventQueueMutex);
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#endif
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}
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/**
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* Change the device id of the given event to the given device's id.
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*/
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static void
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ChangeDeviceID(DeviceIntPtr dev, InternalEvent* event)
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{
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switch(event->any.type)
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{
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case ET_Motion:
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case ET_KeyPress:
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case ET_KeyRelease:
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case ET_ButtonPress:
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case ET_ButtonRelease:
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case ET_ProximityIn:
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case ET_ProximityOut:
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case ET_Hierarchy:
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case ET_DeviceChanged:
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event->device.deviceid = dev->id;
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break;
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#if XFreeXDGA
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case ET_DGAEvent:
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break;
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#endif
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case ET_RawKeyPress:
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case ET_RawKeyRelease:
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case ET_RawButtonPress:
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case ET_RawButtonRelease:
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case ET_RawMotion:
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event->raw.deviceid = dev->id;
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break;
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default:
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ErrorF("[mi] Unknown event type (%d), cannot change id.\n",
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event->any.type);
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}
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}
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static void
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FixUpEventForMaster(DeviceIntPtr mdev, DeviceIntPtr sdev,
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InternalEvent* original, InternalEvent *master)
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{
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CHECKEVENT(original);
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CHECKEVENT(master);
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/* Ensure chained button mappings, i.e. that the detail field is the
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* value of the mapped button on the SD, not the physical button */
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if (original->any.type == ET_ButtonPress ||
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original->any.type == ET_ButtonRelease)
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{
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int btn = original->device.detail.button;
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if (!sdev->button)
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return; /* Should never happen */
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master->device.detail.button = sdev->button->map[btn];
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}
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}
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/**
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* Copy the given event into master.
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* @param sdev The slave device the original event comes from
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* @param original The event as it came from the EQ
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* @param copy The event after being copied
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* @return The master device or NULL if the device is a floating slave.
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*/
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DeviceIntPtr
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CopyGetMasterEvent(DeviceIntPtr sdev,
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InternalEvent* original, InternalEvent *copy)
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{
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DeviceIntPtr mdev;
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int len = original->any.length;
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CHECKEVENT(original);
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if (!sdev->u.master)
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return NULL;
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switch(original->any.type)
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{
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case ET_KeyPress:
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case ET_KeyRelease:
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mdev = GetMaster(sdev, MASTER_KEYBOARD);
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break;
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case ET_ButtonPress:
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case ET_ButtonRelease:
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case ET_Motion:
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case ET_ProximityIn:
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case ET_ProximityOut:
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mdev = GetMaster(sdev, MASTER_POINTER);
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break;
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default:
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mdev = sdev->u.master;
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break;
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}
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memcpy(copy, original, len);
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ChangeDeviceID(mdev, copy);
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FixUpEventForMaster(mdev, sdev, original, copy);
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return mdev;
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}
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/**
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* Post the given @event through the device hierarchy, as appropriate.
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* Use this function if an event must be posted for a given device during the
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* usual event processing cycle.
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*/
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void
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mieqProcessDeviceEvent(DeviceIntPtr dev,
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InternalEvent *event,
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ScreenPtr screen)
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{
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mieqHandler handler;
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int x = 0, y = 0;
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DeviceIntPtr master;
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InternalEvent mevent; /* master event */
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CHECKEVENT(event);
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/* Custom event handler */
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handler = miEventQueue.handlers[event->any.type];
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switch (event->any.type) {
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/* Catch events that include valuator information and check if they
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* are changing the screen */
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case ET_Motion:
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case ET_KeyPress:
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case ET_KeyRelease:
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case ET_ButtonPress:
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case ET_ButtonRelease:
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if (dev && screen && screen != DequeueScreen(dev) && !handler) {
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DequeueScreen(dev) = screen;
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x = event->device.root_x;
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y = event->device.root_y;
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NewCurrentScreen (dev, DequeueScreen(dev), x, y);
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}
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break;
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default:
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break;
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}
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master = CopyGetMasterEvent(dev, event, &mevent);
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if (master)
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master->u.lastSlave = dev;
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/* If someone's registered a custom event handler, let them
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* steal it. */
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if (handler)
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{
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int screenNum = dev && DequeueScreen(dev) ? DequeueScreen(dev)->myNum : (screen ? screen->myNum : 0);
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handler(screenNum, event, dev);
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/* Check for the SD's master in case the device got detached
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* during event processing */
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if (master && dev->u.master)
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handler(screenNum, &mevent, master);
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} else
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{
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/* process slave first, then master */
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dev->public.processInputProc(event, dev);
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/* Check for the SD's master in case the device got detached
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* during event processing */
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if (master && dev->u.master)
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master->public.processInputProc(&mevent, master);
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}
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}
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/* Call this from ProcessInputEvents(). */
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void
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mieqProcessInputEvents(void)
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{
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EventRec *e = NULL;
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int evlen;
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ScreenPtr screen;
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static InternalEvent *event = NULL;
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static size_t event_size = 0;
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DeviceIntPtr dev = NULL,
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master = NULL;
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#ifdef XQUARTZ
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pthread_mutex_lock(&miEventQueueMutex);
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#endif
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while (miEventQueue.head != miEventQueue.tail) {
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e = &miEventQueue.events[miEventQueue.head];
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evlen = e->events->evlen;
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if(evlen > event_size)
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event = xrealloc(event, evlen);
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if (!event)
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FatalError("[mi] No memory left for event processing.\n");
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memcpy(event, e->events->event, evlen);
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dev = e->pDev;
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screen = e->pScreen;
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miEventQueue.head = (miEventQueue.head + 1) % QUEUE_SIZE;
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#ifdef XQUARTZ
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pthread_mutex_unlock(&miEventQueueMutex);
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#endif
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master = (dev && !IsMaster(dev) && dev->u.master) ? dev->u.master : NULL;
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if (screenIsSaved == SCREEN_SAVER_ON)
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dixSaveScreens (serverClient, SCREEN_SAVER_OFF, ScreenSaverReset);
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#ifdef DPMSExtension
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else if (DPMSPowerLevel != DPMSModeOn)
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SetScreenSaverTimer();
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if (DPMSPowerLevel != DPMSModeOn)
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DPMSSet(serverClient, DPMSModeOn);
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#endif
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mieqProcessDeviceEvent(dev, event, screen);
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/* Update the sprite now. Next event may be from different device. */
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if (event->any.type == ET_Motion && master)
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miPointerUpdateSprite(dev);
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#ifdef XQUARTZ
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pthread_mutex_lock(&miEventQueueMutex);
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#endif
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}
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#ifdef XQUARTZ
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pthread_mutex_unlock(&miEventQueueMutex);
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#endif
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}
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