Mercurial > sdl-ios-xcode

annotate src/thread/epoc/SDL_sysmutex.cpp @ 3954:649fba69eccd SDL-1.2

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Set supervisor as volatile as it is modified from an interrupt
author Patrice Mandin <patmandin@gmail.com>
date Fri, 08 Jun 2007 21:44:40 +0000
parents 92947e3a18db
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 SDL_sysmutex.cpp
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26
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27 Epoc version by Markus Mertama (w@iki.fi)
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28 */
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29
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30
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31 /* Mutex functions using the Win32 API */
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32
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33 #include<e32std.h>
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34
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35 #include "SDL_error.h"
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36 #include "SDL_mutex.h"
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37
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38
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39
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40 struct SDL_mutex
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41 {
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42 TInt handle;
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43 };
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44
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45 extern TInt CreateUnique(TInt (*aFunc)(const TDesC& aName, TAny*, TAny*), TAny*, TAny*);
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46
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47 TInt NewMutex(const TDesC& aName, TAny* aPtr1, TAny*)
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48 {
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49 return ((RMutex*)aPtr1)->CreateGlobal(aName);
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50 }
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51
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52 /* Create a mutex */
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53 SDL_mutex *SDL_CreateMutex(void)
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54 {
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55 RMutex rmutex;
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56
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57 TInt status = CreateUnique(NewMutex, &rmutex, NULL);
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58 if(status != KErrNone)
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59 {
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60 SDL_SetError("Couldn't create mutex");
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61 }
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62 SDL_mutex* mutex = new /*(ELeave)*/ SDL_mutex;
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63 mutex->handle = rmutex.Handle();
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64 return(mutex);
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65 }
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66
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67 /* Free the mutex */
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68 void SDL_DestroyMutex(SDL_mutex *mutex)
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69 {
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70 if ( mutex )
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71 {
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72 RMutex rmutex;
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73 rmutex.SetHandle(mutex->handle);
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74 rmutex.Signal();
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75 rmutex.Close();
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76 delete(mutex);
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77 mutex = NULL;
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78 }
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79 }
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80
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81 /* Lock the mutex */
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82 int SDL_mutexP(SDL_mutex *mutex)
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83 {
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84 if ( mutex == NULL ) {
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85 SDL_SetError("Passed a NULL mutex");
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86 return -1;
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87 }
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88 RMutex rmutex;
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89 rmutex.SetHandle(mutex->handle);
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90 rmutex.Wait();
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91 return(0);
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92 }
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93
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94 /* Unlock the mutex */
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95 int SDL_mutexV(SDL_mutex *mutex)
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96 {
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97 if ( mutex == NULL ) {
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98 SDL_SetError("Passed a NULL mutex");
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99 return -1;
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100 }
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101 RMutex rmutex;
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102 rmutex.SetHandle(mutex->handle);
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103 rmutex.Signal();
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104 return(0);
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105 }