Mercurial > sdl-ios-xcode
annotate src/thread/generic/SDL_sysmutex.c @ 779:68c8da837fc0
Date: Tue, 6 Jan 2004 21:54:02 +0100
From: Max Horn
Subject: Auto hide mouse & other changes
the attached bug adds the auto-hide-mouse feature I talked about
earlier. Turned out it was a lot simpler than I thought, simply by
using our existing code :-). I actually spent much more time on fixing
various bugs in the code and correcting (IMO) some behavior (although,
due to the lack of real specs for SDL, it's probably arguable what
'correct' means...).
* adds auto (un)hiding of mouse depending on whether it is in- or
outside the game window
* computation of course coordinates is correct now (it often and
reproducible got out of sync with the old code, since the NSEvent
window was in some cases *not* our window anymore, so locationInWindow
returned wrong results)
* added a method which at any time returns the mouse coords, relative
to our window
* fixed handling of lost/gain input/mouse/app focus "events"
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 07 Jan 2004 15:01:51 +0000 |
| parents | b8d311d90021 |
| children | c9b51268668f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
769
b8d311d90021
Updated copyright information for 2004 (Happy New Year!)
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 9 | |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
252
e8157fcb3114
Updated the source with the correct e-mail address
Sam Lantinga <slouken@libsdl.org>
parents:
0
diff
changeset
|
20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* An implementation of mutexes using semaphores */ | |
| 29 | |
| 30 #include <stdio.h> | |
| 31 #include <stdlib.h> | |
| 32 | |
| 33 #include "SDL_error.h" | |
| 34 #include "SDL_thread.h" | |
| 35 #include "SDL_systhread_c.h" | |
| 36 | |
| 37 | |
| 38 struct SDL_mutex { | |
| 39 int recursive; | |
| 40 Uint32 owner; | |
| 41 SDL_sem *sem; | |
| 42 }; | |
| 43 | |
| 44 /* Create a mutex */ | |
| 45 SDL_mutex *SDL_CreateMutex(void) | |
| 46 { | |
| 47 SDL_mutex *mutex; | |
| 48 | |
| 49 /* Allocate mutex memory */ | |
| 50 mutex = (SDL_mutex *)malloc(sizeof(*mutex)); | |
| 51 if ( mutex ) { | |
| 52 /* Create the mutex semaphore, with initial value 1 */ | |
| 53 mutex->sem = SDL_CreateSemaphore(1); | |
| 54 mutex->recursive = 0; | |
| 55 mutex->owner = 0; | |
| 56 if ( ! mutex->sem ) { | |
| 57 free(mutex); | |
| 58 mutex = NULL; | |
| 59 } | |
| 60 } else { | |
| 61 SDL_OutOfMemory(); | |
| 62 } | |
| 63 return mutex; | |
| 64 } | |
| 65 | |
| 66 /* Free the mutex */ | |
| 67 void SDL_DestroyMutex(SDL_mutex *mutex) | |
| 68 { | |
| 69 if ( mutex ) { | |
| 70 if ( mutex->sem ) { | |
| 71 SDL_DestroySemaphore(mutex->sem); | |
| 72 } | |
| 73 free(mutex); | |
| 74 } | |
| 75 } | |
| 76 | |
| 77 /* Lock the semaphore */ | |
| 78 int SDL_mutexP(SDL_mutex *mutex) | |
| 79 { | |
| 80 #ifdef DISABLE_THREADS | |
| 81 return 0; | |
| 82 #else | |
| 83 Uint32 this_thread; | |
| 84 | |
| 85 if ( mutex == NULL ) { | |
| 86 SDL_SetError("Passed a NULL mutex"); | |
| 87 return -1; | |
| 88 } | |
| 89 | |
| 90 this_thread = SDL_ThreadID(); | |
| 91 if ( mutex->owner == this_thread ) { | |
| 92 ++mutex->recursive; | |
| 93 } else { | |
| 94 /* The order of operations is important. | |
| 95 We set the locking thread id after we obtain the lock | |
| 96 so unlocks from other threads will fail. | |
| 97 */ | |
| 98 SDL_SemWait(mutex->sem); | |
| 99 mutex->owner = this_thread; | |
| 100 mutex->recursive = 0; | |
| 101 } | |
| 102 | |
| 103 return 0; | |
| 104 #endif /* DISABLE_THREADS */ | |
| 105 } | |
| 106 | |
| 107 /* Unlock the mutex */ | |
| 108 int SDL_mutexV(SDL_mutex *mutex) | |
| 109 { | |
| 110 #ifdef DISABLE_THREADS | |
| 111 return 0; | |
| 112 #else | |
| 113 if ( mutex == NULL ) { | |
| 114 SDL_SetError("Passed a NULL mutex"); | |
| 115 return -1; | |
| 116 } | |
| 117 | |
| 118 /* If we don't own the mutex, we can't unlock it */ | |
| 119 if ( SDL_ThreadID() != mutex->owner ) { | |
| 120 SDL_SetError("mutex not owned by this thread"); | |
| 121 return -1; | |
| 122 } | |
| 123 | |
| 124 if ( mutex->recursive ) { | |
| 125 --mutex->recursive; | |
| 126 } else { | |
| 127 /* The order of operations is important. | |
| 128 First reset the owner so another thread doesn't lock | |
| 129 the mutex and set the ownership before we reset it, | |
| 130 then release the lock semaphore. | |
| 131 */ | |
| 132 mutex->owner = 0; | |
| 133 SDL_SemPost(mutex->sem); | |
| 134 } | |
| 135 return 0; | |
| 136 #endif /* DISABLE_THREADS */ | |
| 137 } |