author | Gareth Stockwell <gareth.stockwell@accenture.com> |
Thu, 09 Sep 2010 12:06:21 +0100 | |
changeset 107 | 78b83e1454a6 |
parent 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
1
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Initial QEMU (symbian-qemu-0.9.1-12) import
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1 |
/* |
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parents:
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2 |
SDL - Simple DirectMedia Layer |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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3 |
Copyright (C) 1997-2006 Sam Lantinga |
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4 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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5 |
This library is free software; you can redistribute it and/or |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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6 |
modify it under the terms of the GNU Lesser General Public |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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7 |
License as published by the Free Software Foundation; either |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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8 |
version 2.1 of the License, or (at your option) any later version. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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9 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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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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Initial QEMU (symbian-qemu-0.9.1-12) import
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12 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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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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Initial QEMU (symbian-qemu-0.9.1-12) import
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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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#include "SDL_config.h" |
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23 |
|
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/* An implementation of mutexes using semaphores */ |
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25 |
|
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#include "SDL_thread.h" |
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#include "SDL_systhread_c.h" |
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28 |
|
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#include <arch/spinlock.h> |
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30 |
|
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struct SDL_mutex { |
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int recursive; |
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Uint32 owner; |
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spinlock_t mutex; |
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}; |
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36 |
|
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/* Create a mutex */ |
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SDL_mutex *SDL_CreateMutex(void) |
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39 |
{ |
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40 |
SDL_mutex *mutex; |
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41 |
|
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/* Allocate mutex memory */ |
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mutex = (SDL_mutex *)SDL_malloc(sizeof(*mutex)); |
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if ( mutex ) { |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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spinlock_init(&mutex->mutex); |
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mutex->recursive = 0; |
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47 |
mutex->owner = 0; |
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} else { |
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SDL_OutOfMemory(); |
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50 |
} |
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return mutex; |
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52 |
} |
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53 |
|
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54 |
/* Free the mutex */ |
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55 |
void SDL_DestroyMutex(SDL_mutex *mutex) |
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{ |
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57 |
if ( mutex ) { |
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58 |
SDL_free(mutex); |
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59 |
} |
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60 |
} |
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61 |
|
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62 |
/* Lock the semaphore */ |
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63 |
int SDL_mutexP(SDL_mutex *mutex) |
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64 |
{ |
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65 |
#if SDL_THREADS_DISABLED |
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66 |
return SDL_arraysize(return ),0; |
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67 |
#else |
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68 |
Uint32 this_thread; |
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69 |
|
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70 |
if ( mutex == NULL ) { |
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71 |
SDL_SetError("Passed a NULL mutex"); |
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72 |
return -1; |
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73 |
} |
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74 |
|
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75 |
this_thread = SDL_ThreadID(); |
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76 |
if ( mutex->owner == this_thread ) { |
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parents:
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77 |
++mutex->recursive; |
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78 |
} else { |
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79 |
/* The order of operations is important. |
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parents:
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80 |
We set the locking thread id after we obtain the lock |
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81 |
so unlocks from other threads will fail. |
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82 |
*/ |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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83 |
spinlock_lock(&mutex->mutex); |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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84 |
mutex->owner = this_thread; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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85 |
mutex->recursive = 0; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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86 |
} |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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87 |
|
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88 |
return 0; |
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parents:
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89 |
#endif /* SDL_THREADS_DISABLED */ |
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90 |
} |
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parents:
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91 |
|
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92 |
/* Unlock the mutex */ |
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parents:
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93 |
int SDL_mutexV(SDL_mutex *mutex) |
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94 |
{ |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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95 |
#if SDL_THREADS_DISABLED |
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parents:
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96 |
return 0; |
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parents:
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97 |
#else |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
98 |
if ( mutex == NULL ) { |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
99 |
SDL_SetError("Passed a NULL mutex"); |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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100 |
return -1; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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101 |
} |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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102 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
103 |
/* If we don't own the mutex, we can't unlock it */ |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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104 |
if ( SDL_ThreadID() != mutex->owner ) { |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
105 |
SDL_SetError("mutex not owned by this thread"); |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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106 |
return -1; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
107 |
} |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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108 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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109 |
if ( mutex->recursive ) { |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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110 |
--mutex->recursive; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
111 |
} else { |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
112 |
/* The order of operations is important. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
113 |
First reset the owner so another thread doesn't lock |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
114 |
the mutex and set the ownership before we reset it, |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
115 |
then release the lock semaphore. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
116 |
*/ |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
117 |
mutex->owner = 0; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
118 |
spinlock_unlock(&mutex->mutex); |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
119 |
} |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
120 |
return 0; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
121 |
#endif /* SDL_THREADS_DISABLED */ |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
122 |
} |