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annotate src/thread/pth/SDL_sysmutex.c @ 1240:3b8a43c428bb

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From Bug #36: There are a couple of issues with the selection of Altivec alpha-blitting routines in CalculateAlphaBlit() in src/video/SDL_Blit_A.c. 1) There's no check for the presence of Altivec when checking if the Blit32to565PixelAlphaAltivec() routine can be selected. 2) Altivec cannot be used in video memory, and there's no check if the destination surface is a hardware surface. (Alpha-blitting to a hardware surface with GPU support is a bad idea, but somebody's bound to do it anyway.) Patch to fix these attached.
author Ryan C. Gordon <icculus@icculus.org>
date Sun, 08 Jan 2006 21:18:15 +0000
parents 1d74ddc90cb2
children 3692456e7b0f
rev   line source
329
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1 /*
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2 * GNU pth mutexes
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3 *
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4 * Patrice Mandin
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5 */
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6
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9 #include <pth.h>
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10
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11 #include "SDL_error.h"
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12 #include "SDL_mutex.h"
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13 #include "SDL_sysmutex_c.h"
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14
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15 /* Create a mutex */
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16 SDL_mutex *SDL_CreateMutex(void)
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17 {
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18 SDL_mutex *mutex;
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19
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20 /* Allocate mutex memory */
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21 mutex = (SDL_mutex *)malloc(sizeof(*mutex));
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22 if ( mutex ) {
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23 /* Create the mutex, with initial value signaled */
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24 if (!pth_mutex_init(&(mutex->mutexpth_p))) {
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25 SDL_SetError("Couldn't create mutex");
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26 free(mutex);
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27 mutex = NULL;
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28 }
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29 } else {
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30 SDL_OutOfMemory();
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31 }
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32 return(mutex);
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33 }
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34
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35 /* Free the mutex */
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36 void SDL_DestroyMutex(SDL_mutex *mutex)
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37 {
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38 if ( mutex ) {
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39 free(mutex);
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40 }
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41 }
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42
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43 /* Lock the mutex */
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44 int SDL_mutexP(SDL_mutex *mutex)
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45 {
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46 if ( mutex == NULL ) {
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47 SDL_SetError("Passed a NULL mutex");
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48 return -1;
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49 }
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50
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51 pth_mutex_acquire(&(mutex->mutexpth_p), FALSE, NULL);
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52
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53 return(0);
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54 }
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55
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56 /* Unlock the mutex */
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57 int SDL_mutexV(SDL_mutex *mutex)
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58 {
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59 if ( mutex == NULL ) {
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60 SDL_SetError("Passed a NULL mutex");
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61 return -1;
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62 }
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63
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64 pth_mutex_release(&(mutex->mutexpth_p));
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65
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66 return(0);
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67 }