annotate src/thread/pth/SDL_sysmutex.c @ 4391:07b330419439 SDL-1.2

Fixed bug #849 some more: Tim Angus 2009-11-26 14:41:04 PST Fix to the cursor not being responsive when the app doesn't have SDL_APPINPUTFOCUS The problems with the directx driver are similar to the ones I introduced in the windib driver with r4478. Basically if the application did not have focus, the mouse position is not updated. It's not really that the mouse cursor was invisible, it's that it is stuck underneath another window where you can't see it. This behaviour predates my r4478 changes and is the reason I unwittingly broke the windib driver as I had been replicating the way the directx driver deals with focus. Prior to r4478 the directx driver could not be used in windowed mode, so the broken focusing would not have actually been observable. Anyway, the attached patch makes the directx driver behaves like the windib driver in terms of focus. Time for 1.2.15? ;) I've added an additional change of moving the calls to WIN_GrabInput that are made on WM_ACTIVATE messages so that they only occur when the state is SDL_APPINPUTFOCUS. When a fullscreen application is minimised using alt-tab, it still receives WM_ACTIVATE messages when other applications are selected. If WIN_GrabInput is called when the SDL application doesn't have input focus, bad things happen; it shouldn't be being called at all. I've also added a line to make sure that SDL_APPMOUSEFOCUS state is dropped when the application is minimised following an alt-tab.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 11 Dec 2009 15:24:53 +0000
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /*
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25 * GNU pth mutexes
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26 *
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27 * Patrice Mandin
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28 */
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29
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30 #include <pth.h>
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31
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32 #include "SDL_mutex.h"
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33 #include "SDL_sysmutex_c.h"
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34
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35 /* Create a mutex */
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36 SDL_mutex *SDL_CreateMutex(void)
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37 {
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38 SDL_mutex *mutex;
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39
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40 /* Allocate mutex memory */
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41 mutex = (SDL_mutex *)SDL_malloc(sizeof(*mutex));
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42 if ( mutex ) {
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43 /* Create the mutex, with initial value signaled */
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44 if (!pth_mutex_init(&(mutex->mutexpth_p))) {
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45 SDL_SetError("Couldn't create mutex");
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46 SDL_free(mutex);
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47 mutex = NULL;
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48 }
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49 } else {
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50 SDL_OutOfMemory();
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51 }
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52 return(mutex);
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53 }
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54
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55 /* Free the mutex */
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56 void SDL_DestroyMutex(SDL_mutex *mutex)
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57 {
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58 if ( mutex ) {
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59 SDL_free(mutex);
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60 }
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61 }
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62
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63 /* Lock the mutex */
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64 int SDL_mutexP(SDL_mutex *mutex)
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65 {
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66 if ( mutex == NULL ) {
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67 SDL_SetError("Passed a NULL mutex");
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68 return -1;
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69 }
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70
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71 pth_mutex_acquire(&(mutex->mutexpth_p), FALSE, NULL);
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72
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73 return(0);
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74 }
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75
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76 /* Unlock the mutex */
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77 int SDL_mutexV(SDL_mutex *mutex)
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78 {
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79 if ( mutex == NULL ) {
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80 SDL_SetError("Passed a NULL mutex");
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81 return -1;
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82 }
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83
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84 pth_mutex_release(&(mutex->mutexpth_p));
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85
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86 return(0);
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87 }