src/events/SDL_events.c
author Sam Lantinga
Thu, 27 Jan 2011 14:45:06 -0800
changeset 5111 481dabb098ef
parent 5086 c2539ff054c8
child 5123 dc0dfdd58f27
permissions -rw-r--r--
Improved timer implementation

The new timer model is formalized as using a separate thread to handle timer callbacks. This was the case on almost every platform before, but it's now a requirement, and simplifies the implementation and makes it perform consistently across platforms.

Goals:
* Minimize timer thread blocking
* Dispatch timers as accurately as possible
* SDL_AddTimer() and SDL_RemoveTimer() are completely threadsafe
* SDL_RemoveTimer() doesn't crash with a timer that's expired or removed
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2010 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/* General event handling code for SDL */
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#include "SDL.h"
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#include "SDL_events.h"
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#include "SDL_syswm.h"
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#include "SDL_thread.h"
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#include "SDL_sysevents.h"
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#include "SDL_events_c.h"
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#include "../timer/SDL_timer_c.h"
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#if !SDL_JOYSTICK_DISABLED
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#include "../joystick/SDL_joystick_c.h"
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#endif
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/* Public data -- the event filter */
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SDL_EventFilter SDL_EventOK = NULL;
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void *SDL_EventOKParam;
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typedef struct {
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    Uint32 bits[8];
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} SDL_DisabledEventBlock;
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static SDL_DisabledEventBlock *SDL_disabled_events[256];
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static Uint32 SDL_userevents = SDL_USEREVENT;
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/* Private data -- event queue */
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#define MAXEVENTS	128
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static struct
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{
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    SDL_mutex *lock;
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    int active;
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    int head;
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    int tail;
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    SDL_Event event[MAXEVENTS];
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    int wmmsg_next;
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    struct SDL_SysWMmsg wmmsg[MAXEVENTS];
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} SDL_EventQ;
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/* Private data -- event locking structure */
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static struct
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{
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    SDL_mutex *lock;
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    int safe;
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} SDL_EventLock;
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/* Thread functions */
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static SDL_Thread *SDL_EventThread = NULL;      /* Thread handle */
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static SDL_threadID event_thread;     /* The event thread id */
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void
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SDL_Lock_EventThread(void)
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{
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    if (SDL_EventThread && (SDL_ThreadID() != event_thread)) {
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        /* Grab lock and spin until we're sure event thread stopped */
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        SDL_mutexP(SDL_EventLock.lock);
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        while (!SDL_EventLock.safe) {
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            SDL_Delay(1);
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        }
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    }
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}
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void
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SDL_Unlock_EventThread(void)
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{
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    if (SDL_EventThread && (SDL_ThreadID() != event_thread)) {
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        SDL_mutexV(SDL_EventLock.lock);
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    }
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}
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static __inline__ SDL_bool
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SDL_ShouldPollJoystick()
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{
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#if !SDL_JOYSTICK_DISABLED
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    if (SDL_numjoysticks &&
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        (!SDL_disabled_events[SDL_JOYAXISMOTION >> 8] ||
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         SDL_JoystickEventState(SDL_QUERY))) {
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        return SDL_TRUE;
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    }
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#endif
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    return SDL_FALSE;
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}
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static int SDLCALL
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SDL_GobbleEvents(void *unused)
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{
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    event_thread = SDL_ThreadID();
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    while (SDL_EventQ.active) {
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        SDL_VideoDevice *_this = SDL_GetVideoDevice();
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        /* Get events from the video subsystem */
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        if (_this) {
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            _this->PumpEvents(_this);
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        }
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#if !SDL_JOYSTICK_DISABLED
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        /* Check for joystick state change */
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        if (SDL_ShouldPollJoystick()) {
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            SDL_JoystickUpdate();
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        }
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#endif
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        /* Give up the CPU for the rest of our timeslice */
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        SDL_EventLock.safe = 1;
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        SDL_Delay(1);
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        /* Check for event locking.
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           On the P of the lock mutex, if the lock is held, this thread
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           will wait until the lock is released before continuing.  The
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           safe flag will be set, meaning that the other thread can go
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           about it's business.  The safe flag is reset before the V,
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           so as soon as the mutex is free, other threads can see that
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           it's not safe to interfere with the event thread.
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         */
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        SDL_mutexP(SDL_EventLock.lock);
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        SDL_EventLock.safe = 0;
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        SDL_mutexV(SDL_EventLock.lock);
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    }
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    event_thread = 0;
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    return (0);
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}
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static int
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SDL_StartEventThread(Uint32 flags)
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{
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    /* Reset everything to zero */
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    SDL_EventThread = NULL;
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    SDL_memset(&SDL_EventLock, 0, sizeof(SDL_EventLock));
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    /* Create the lock and set ourselves active */
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#if !SDL_THREADS_DISABLED
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    SDL_EventQ.lock = SDL_CreateMutex();
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    if (SDL_EventQ.lock == NULL) {
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        return (-1);
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    }
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#endif /* !SDL_THREADS_DISABLED */
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    SDL_EventQ.active = 1;
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    if ((flags & SDL_INIT_EVENTTHREAD) == SDL_INIT_EVENTTHREAD) {
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        SDL_EventLock.lock = SDL_CreateMutex();
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        if (SDL_EventLock.lock == NULL) {
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            return (-1);
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        }
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        SDL_EventLock.safe = 0;
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#if (defined(__WIN32__) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC)
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#undef SDL_CreateThread
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        SDL_EventThread =
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            SDL_CreateThread(SDL_GobbleEvents, NULL, NULL, NULL);
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#else
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        SDL_EventThread = SDL_CreateThread(SDL_GobbleEvents, NULL);
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#endif
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        if (SDL_EventThread == NULL) {
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            return (-1);
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        }
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    } else {
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        event_thread = 0;
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    }
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    return (0);
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}
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static void
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SDL_StopEventThread(void)
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{
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    SDL_EventQ.active = 0;
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    if (SDL_EventThread) {
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        SDL_WaitThread(SDL_EventThread, NULL);
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        SDL_EventThread = NULL;
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        SDL_DestroyMutex(SDL_EventLock.lock);
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        SDL_EventLock.lock = NULL;
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    }
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    if (SDL_EventQ.lock) {
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        SDL_DestroyMutex(SDL_EventQ.lock);
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        SDL_EventQ.lock = NULL;
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    }
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}
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SDL_threadID
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SDL_EventThreadID(void)
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{
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    return (event_thread);
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}
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/* Public functions */
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void
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SDL_StopEventLoop(void)
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{
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    int i;
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    /* Halt the event thread, if running */
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    SDL_StopEventThread();
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    /* Shutdown event handlers */
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    SDL_KeyboardQuit();
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    SDL_MouseQuit();
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    SDL_QuitQuit();
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    /* Clean out EventQ */
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    SDL_EventQ.head = 0;
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    SDL_EventQ.tail = 0;
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    SDL_EventQ.wmmsg_next = 0;
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    /* Clear disabled event state */
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    for (i = 0; i < SDL_arraysize(SDL_disabled_events); ++i) {
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        if (SDL_disabled_events[i]) {
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            SDL_free(SDL_disabled_events[i]);
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            SDL_disabled_events[i] = NULL;
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        }
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    }
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}
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/* This function (and associated calls) may be called more than once */
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int
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SDL_StartEventLoop(Uint32 flags)
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{
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    int retcode;
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    /* Clean out the event queue */
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    SDL_EventThread = NULL;
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    SDL_EventQ.lock = NULL;
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    SDL_StopEventLoop();
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    /* No filter to start with, process most event types */
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    SDL_EventOK = NULL;
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    SDL_EventState(SDL_SYSWMEVENT, SDL_DISABLE);
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    /* Initialize event handlers */
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    retcode = 0;
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    retcode += SDL_KeyboardInit();
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    retcode += SDL_MouseInit();
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    retcode += SDL_TouchInit();
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    retcode += SDL_QuitInit();
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    if (retcode < 0) {
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        /* We don't expect them to fail, but... */
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        return (-1);
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    }
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    /* Create the lock and event thread */
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    if (SDL_StartEventThread(flags) < 0) {
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        SDL_StopEventLoop();
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        return (-1);
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    }
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    return (0);
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}
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/* Add an event to the event queue -- called with the queue locked */
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static int
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SDL_AddEvent(SDL_Event * event)
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{
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    int tail, added;
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    tail = (SDL_EventQ.tail + 1) % MAXEVENTS;
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    if (tail == SDL_EventQ.head) {
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        /* Overflow, drop event */
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        added = 0;
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    } else {
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        SDL_EventQ.event[SDL_EventQ.tail] = *event;
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        if (event->type == SDL_SYSWMEVENT) {
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            /* Note that it's possible to lose an event */
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            int next = SDL_EventQ.wmmsg_next;
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            SDL_EventQ.wmmsg[next] = *event->syswm.msg;
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            SDL_EventQ.event[SDL_EventQ.tail].syswm.msg =
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                &SDL_EventQ.wmmsg[next];
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            SDL_EventQ.wmmsg_next = (next + 1) % MAXEVENTS;
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        }
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        SDL_EventQ.tail = tail;
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        added = 1;
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    }
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    return (added);
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}
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/* Cut an event, and return the next valid spot, or the tail */
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/*                           -- called with the queue locked */
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static int
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SDL_CutEvent(int spot)
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{
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    if (spot == SDL_EventQ.head) {
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        SDL_EventQ.head = (SDL_EventQ.head + 1) % MAXEVENTS;
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        return (SDL_EventQ.head);
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    } else if ((spot + 1) % MAXEVENTS == SDL_EventQ.tail) {
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        SDL_EventQ.tail = spot;
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        return (SDL_EventQ.tail);
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    } else
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        /* We cut the middle -- shift everything over */
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    {
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        int here, next;
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        /* This can probably be optimized with SDL_memcpy() -- careful! */
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        if (--SDL_EventQ.tail < 0) {
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            SDL_EventQ.tail = MAXEVENTS - 1;
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        }
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        for (here = spot; here != SDL_EventQ.tail; here = next) {
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            next = (here + 1) % MAXEVENTS;
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            SDL_EventQ.event[here] = SDL_EventQ.event[next];
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        }
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        return (spot);
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    }
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    /* NOTREACHED */
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}
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/* Lock the event queue, take a peep at it, and unlock it */
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int
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SDL_PeepEvents(SDL_Event * events, int numevents, SDL_eventaction action,
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               Uint32 minType, Uint32 maxType)
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{
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    int i, used;
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    /* Don't look after we've quit */
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    if (!SDL_EventQ.active) {
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        return (-1);
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    }
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    /* Lock the event queue */
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    used = 0;
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    if (SDL_mutexP(SDL_EventQ.lock) == 0) {
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        if (action == SDL_ADDEVENT) {
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            for (i = 0; i < numevents; ++i) {
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                used += SDL_AddEvent(&events[i]);
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            }
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        } else {
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            SDL_Event tmpevent;
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            int spot;
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            /* If 'events' is NULL, just see if they exist */
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            if (events == NULL) {
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                action = SDL_PEEKEVENT;
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                numevents = 1;
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                events = &tmpevent;
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            }
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            spot = SDL_EventQ.head;
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            while ((used < numevents) && (spot != SDL_EventQ.tail)) {
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                Uint32 type = SDL_EventQ.event[spot].type;
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                if (minType <= type && type <= maxType) {
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                    events[used++] = SDL_EventQ.event[spot];
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   357
                    if (action == SDL_GETEVENT) {
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                        spot = SDL_CutEvent(spot);
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                    } else {
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                        spot = (spot + 1) % MAXEVENTS;
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                    }
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                } else {
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                    spot = (spot + 1) % MAXEVENTS;
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                }
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            }
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        }
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        SDL_mutexV(SDL_EventQ.lock);
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    } else {
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        SDL_SetError("Couldn't lock event queue");
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        used = -1;
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    }
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    return (used);
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}
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SDL_bool
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SDL_HasEvent(Uint32 type)
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{
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    return (SDL_PeepEvents(NULL, 0, SDL_PEEKEVENT, type, type) > 0);
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}
slouken@4429
   380
slouken@4429
   381
SDL_bool
slouken@4429
   382
SDL_HasEvents(Uint32 minType, Uint32 maxType)
slouken@4429
   383
{
slouken@4429
   384
    return (SDL_PeepEvents(NULL, 0, SDL_PEEKEVENT, minType, maxType) > 0);
slouken@4429
   385
}
slouken@4429
   386
slouken@4429
   387
void
slouken@4429
   388
SDL_FlushEvent(Uint32 type)
slouken@1895
   389
{
slouken@4429
   390
    SDL_FlushEvents(type, type);
slouken@4429
   391
}
slouken@4429
   392
slouken@4429
   393
void
slouken@4429
   394
SDL_FlushEvents(Uint32 minType, Uint32 maxType)
slouken@4429
   395
{
slouken@4429
   396
    /* Don't look after we've quit */
slouken@4429
   397
    if (!SDL_EventQ.active) {
slouken@4429
   398
        return;
slouken@4429
   399
    }
slouken@4429
   400
slouken@4460
   401
    /* Make sure the events are current */
slouken@4460
   402
    SDL_PumpEvents();
slouken@4460
   403
slouken@4429
   404
    /* Lock the event queue */
slouken@4429
   405
    if (SDL_mutexP(SDL_EventQ.lock) == 0) {
slouken@4429
   406
        int spot = SDL_EventQ.head;
slouken@4429
   407
        while (spot != SDL_EventQ.tail) {
slouken@4429
   408
            Uint32 type = SDL_EventQ.event[spot].type;
slouken@4429
   409
            if (minType <= type && type <= maxType) {
slouken@4429
   410
                spot = SDL_CutEvent(spot);
slouken@4429
   411
            } else {
slouken@4429
   412
                spot = (spot + 1) % MAXEVENTS;
slouken@4429
   413
            }
slouken@4429
   414
        }
slouken@4429
   415
        SDL_mutexV(SDL_EventQ.lock);
slouken@4429
   416
    }
slouken@0
   417
}
slouken@0
   418
slouken@0
   419
/* Run the system dependent event loops */
slouken@1895
   420
void
slouken@1895
   421
SDL_PumpEvents(void)
slouken@0
   422
{
slouken@1895
   423
    if (!SDL_EventThread) {
slouken@1895
   424
        SDL_VideoDevice *_this = SDL_GetVideoDevice();
slouken@0
   425
slouken@1895
   426
        /* Get events from the video subsystem */
slouken@1895
   427
        if (_this) {
slouken@1895
   428
            _this->PumpEvents(_this);
slouken@1895
   429
        }
slouken@1361
   430
#if !SDL_JOYSTICK_DISABLED
slouken@1895
   431
        /* Check for joystick state change */
slouken@4429
   432
        if (SDL_ShouldPollJoystick()) {
slouken@1895
   433
            SDL_JoystickUpdate();
slouken@1895
   434
        }
slouken@0
   435
#endif
slouken@1895
   436
    }
slouken@0
   437
}
slouken@0
   438
slouken@0
   439
/* Public functions */
slouken@0
   440
slouken@1895
   441
int
slouken@1895
   442
SDL_PollEvent(SDL_Event * event)
slouken@0
   443
{
slouken@3072
   444
    return SDL_WaitEventTimeout(event, 0);
slouken@1895
   445
}
slouken@0
   446
slouken@1895
   447
int
slouken@1895
   448
SDL_WaitEvent(SDL_Event * event)
slouken@1895
   449
{
slouken@3072
   450
    return SDL_WaitEventTimeout(event, -1);
slouken@3072
   451
}
slouken@3072
   452
slouken@3072
   453
int
slouken@3072
   454
SDL_WaitEventTimeout(SDL_Event * event, int timeout)
slouken@3072
   455
{
slouken@3072
   456
    Uint32 expiration = 0;
slouken@3072
   457
slouken@3072
   458
    if (timeout > 0)
slouken@3072
   459
        expiration = SDL_GetTicks() + timeout;
slouken@3072
   460
slouken@3072
   461
    for (;;) {
slouken@1895
   462
        SDL_PumpEvents();
slouken@4429
   463
        switch (SDL_PeepEvents(event, 1, SDL_GETEVENT, SDL_FIRSTEVENT, SDL_LASTEVENT)) {
slouken@1895
   464
        case -1:
slouken@1895
   465
            return 0;
slouken@1895
   466
        case 1:
slouken@1895
   467
            return 1;
slouken@1895
   468
        case 0:
slouken@3072
   469
            if (timeout == 0) {
slouken@3072
   470
                /* Polling and no events, just return */
slouken@3072
   471
                return 0;
slouken@3072
   472
            }
slouken@3072
   473
            if (timeout > 0 && ((int) (SDL_GetTicks() - expiration) >= 0)) {
slouken@3072
   474
                /* Timeout expired and no events */
slouken@3072
   475
                return 0;
slouken@3072
   476
            }
slouken@1895
   477
            SDL_Delay(10);
slouken@3072
   478
            break;
slouken@1895
   479
        }
slouken@1895
   480
    }
slouken@0
   481
}
slouken@0
   482
slouken@1895
   483
int
slouken@1895
   484
SDL_PushEvent(SDL_Event * event)
slouken@0
   485
{
slouken@1895
   486
    if (SDL_EventOK && !SDL_EventOK(SDL_EventOKParam, event)) {
slouken@1895
   487
        return 0;
slouken@1895
   488
    }
slouken@4429
   489
    if (SDL_PeepEvents(event, 1, SDL_ADDEVENT, 0, 0) <= 0) {
slouken@1895
   490
        return -1;
slouken@1895
   491
    }
jim@4657
   492
jim@4657
   493
    SDL_GestureProcessEvent(event);
jim@4657
   494
    
jim@4657
   495
slouken@1895
   496
    return 1;
slouken@0
   497
}
slouken@0
   498
slouken@1895
   499
void
slouken@1895
   500
SDL_SetEventFilter(SDL_EventFilter filter, void *userdata)
slouken@0
   501
{
slouken@1895
   502
    SDL_Event bitbucket;
slouken@1895
   503
slouken@1895
   504
    /* Set filter and discard pending events */
slouken@1895
   505
    SDL_EventOK = filter;
slouken@1895
   506
    SDL_EventOKParam = userdata;
slouken@1895
   507
    while (SDL_PollEvent(&bitbucket) > 0);
slouken@0
   508
}
slouken@0
   509
slouken@1895
   510
SDL_bool
slouken@1895
   511
SDL_GetEventFilter(SDL_EventFilter * filter, void **userdata)
slouken@0
   512
{
slouken@1895
   513
    if (filter) {
slouken@1895
   514
        *filter = SDL_EventOK;
slouken@1895
   515
    }
slouken@1895
   516
    if (userdata) {
slouken@1895
   517
        *userdata = SDL_EventOKParam;
slouken@1895
   518
    }
slouken@1895
   519
    return SDL_EventOK ? SDL_TRUE : SDL_FALSE;
slouken@0
   520
}
slouken@0
   521
slouken@1895
   522
void
slouken@1895
   523
SDL_FilterEvents(SDL_EventFilter filter, void *userdata)
slouken@0
   524
{
slouken@1895
   525
    if (SDL_mutexP(SDL_EventQ.lock) == 0) {
slouken@1895
   526
        int spot;
slouken@1895
   527
slouken@1895
   528
        spot = SDL_EventQ.head;
slouken@1895
   529
        while (spot != SDL_EventQ.tail) {
slouken@1895
   530
            if (filter(userdata, &SDL_EventQ.event[spot])) {
slouken@1895
   531
                spot = (spot + 1) % MAXEVENTS;
slouken@1895
   532
            } else {
slouken@1895
   533
                spot = SDL_CutEvent(spot);
slouken@1895
   534
            }
slouken@1895
   535
        }
slouken@1895
   536
    }
slouken@1895
   537
    SDL_mutexV(SDL_EventQ.lock);
slouken@1895
   538
}
slouken@1895
   539
slouken@1895
   540
Uint8
slouken@4429
   541
SDL_EventState(Uint32 type, int state)
slouken@1895
   542
{
slouken@1895
   543
    Uint8 current_state;
slouken@4429
   544
    Uint8 hi = ((type >> 8) & 0xff);
slouken@4429
   545
    Uint8 lo = (type & 0xff);
slouken@0
   546
slouken@4429
   547
    if (SDL_disabled_events[hi] &&
slouken@4429
   548
        (SDL_disabled_events[hi]->bits[lo/32] & (1 << (lo&31)))) {
slouken@4429
   549
        current_state = SDL_DISABLE;
slouken@4429
   550
    } else {
slouken@4429
   551
        current_state = SDL_ENABLE;
slouken@1895
   552
    }
slouken@0
   553
slouken@4429
   554
    if (state != current_state)
slouken@4429
   555
    {
slouken@4429
   556
        switch (state) {
slouken@4429
   557
        case SDL_DISABLE:
slouken@4429
   558
            /* Disable this event type and discard pending events */
slouken@4429
   559
            if (!SDL_disabled_events[hi]) {
slouken@4429
   560
                SDL_disabled_events[hi] = (SDL_DisabledEventBlock*) SDL_calloc(1, sizeof(SDL_DisabledEventBlock));
slouken@4429
   561
                if (!SDL_disabled_events[hi]) {
slouken@4429
   562
                    /* Out of memory, nothing we can do... */
slouken@4429
   563
                    break;
slouken@4429
   564
                }
slouken@4429
   565
            }
slouken@4429
   566
            SDL_disabled_events[hi]->bits[lo/32] |= (1 << (lo&31));
slouken@4429
   567
            SDL_FlushEvent(type);
slouken@4429
   568
            break;
slouken@4429
   569
        case SDL_ENABLE:
slouken@4429
   570
            SDL_disabled_events[hi]->bits[lo/32] &= ~(1 << (lo&31));
slouken@4429
   571
            break;
slouken@4429
   572
        default:
slouken@4429
   573
            /* Querying state... */
slouken@4429
   574
            break;
slouken@1895
   575
        }
slouken@1895
   576
    }
slouken@4429
   577
slouken@4429
   578
    return current_state;
slouken@4429
   579
}
slouken@4429
   580
slouken@4429
   581
Uint32
slouken@4429
   582
SDL_RegisterEvents(int numevents)
slouken@4429
   583
{
slouken@4429
   584
    Uint32 event_base;
slouken@4429
   585
slouken@4429
   586
    if (SDL_userevents+numevents <= SDL_LASTEVENT) {
slouken@4429
   587
        event_base = SDL_userevents;
slouken@4429
   588
        SDL_userevents += numevents;
slouken@4429
   589
    } else {
slouken@4429
   590
        event_base = (Uint32)-1;
slouken@4429
   591
    }
slouken@4429
   592
    return event_base;
slouken@0
   593
}
slouken@0
   594
slouken@0
   595
/* This is a generic event handler.
slouken@0
   596
 */
slouken@1895
   597
int
slouken@1895
   598
SDL_SendSysWMEvent(SDL_SysWMmsg * message)
slouken@0
   599
{
slouken@1895
   600
    int posted;
slouken@0
   601
slouken@1895
   602
    posted = 0;
slouken@4429
   603
    if (SDL_GetEventState(SDL_SYSWMEVENT) == SDL_ENABLE) {
slouken@1895
   604
        SDL_Event event;
slouken@1895
   605
        SDL_memset(&event, 0, sizeof(event));
slouken@1895
   606
        event.type = SDL_SYSWMEVENT;
slouken@1895
   607
        event.syswm.msg = message;
slouken@1895
   608
        posted = (SDL_PushEvent(&event) > 0);
slouken@1895
   609
    }
slouken@1895
   610
    /* Update internal event state */
slouken@1895
   611
    return (posted);
slouken@0
   612
}
slouken@1895
   613
slouken@1895
   614
/* vi: set ts=4 sw=4 expandtab: */