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3975
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@devolution.com
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21 */
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22
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23 /*
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24 SDL_sysmutex.cpp
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25
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26 Epoc version by Markus Mertama (w@iki.fi)
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27 */
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28
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29
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30 #ifdef SAVE_RCSID
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31 static char rcsid =
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32 "@(#) $Id: SDL_sysmutex.c,v 1.1.2.3 2000/06/22 15:25:23 hercules Exp $";
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33 #endif
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34
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35 /* Mutex functions using the Win32 API */
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36
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37 //#include <stdio.h>
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38 //#include <stdlib.h>
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39
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40 #include <e32std.h>
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41
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42 #include "epoc_sdl.h"
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43
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44 #include "SDL_error.h"
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45 #include "SDL_mutex.h"
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46
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47
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48 #ifdef EKA2 //???
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49 struct SDL_mutex
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50 {
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51 TInt handle;
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52 };
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53 #else
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54 struct _SDL_mutex
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55 {
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56 TInt handle;
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57 };
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58 #endif
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59
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60 extern TInt CreateUnique(TInt (*aFunc)(const TDesC& aName, TAny*, TAny*), TAny*, TAny*);
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61
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62 TInt NewMutex(const TDesC& aName, TAny* aPtr1, TAny*)
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63 {
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64 return ((RMutex*)aPtr1)->CreateGlobal(aName);
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65 }
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66
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67 void DeleteMutex(TAny* aMutex)
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68 {
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69 SDL_DestroyMutex ((SDL_mutex*) aMutex);
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70 }
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71
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72 /* Create a mutex */
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73 SDL_mutex *SDL_CreateMutex(void)
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74 {
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75 RMutex rmutex;
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76
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77 TInt status = CreateUnique(NewMutex, &rmutex, NULL);
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78 if(status != KErrNone)
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79 {
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80 SDL_SetError("Couldn't create mutex");
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81 }
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82 SDL_mutex* mutex = new /*(ELeave)*/ SDL_mutex;
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83 mutex->handle = rmutex.Handle();
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84 EpocSdlEnv::AppendCleanupItem(TSdlCleanupItem(DeleteMutex, mutex));
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85 return(mutex);
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86 }
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87
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88 /* Free the mutex */
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89 void SDL_DestroyMutex(SDL_mutex *mutex)
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90 {
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91 if ( mutex )
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92 {
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93 RMutex rmutex;
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94 rmutex.SetHandle(mutex->handle);
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95 if(rmutex.IsHeld())
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96 {
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97 rmutex.Signal();
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98 }
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99 rmutex.Close();
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100 EpocSdlEnv::RemoveCleanupItem(mutex);
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101 delete(mutex);
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102 mutex = NULL;
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103 }
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104 }
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105
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106 /* Lock the mutex */
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107 int SDL_mutexP(SDL_mutex *mutex)
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108 {
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109 if ( mutex == NULL ) {
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110 SDL_SetError("Passed a NULL mutex");
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111 return -1;
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112 }
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113 RMutex rmutex;
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114 rmutex.SetHandle(mutex->handle);
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115 rmutex.Wait();
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116 return(0);
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117 }
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118
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119 /* Unlock the mutex */
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120 int SDL_mutexV(SDL_mutex *mutex)
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121 {
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122 if ( mutex == NULL ) {
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123 SDL_SetError("Passed a NULL mutex");
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124 return -1;
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125 }
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126 RMutex rmutex;
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127 rmutex.SetHandle(mutex->handle);
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128 rmutex.Signal();
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129 return(0);
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130 }
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