Mercurial > sdl-ios-xcode
annotate src/thread/amigaos/SDL_syssem.c @ 1361:19418e4422cb
New configure-based build system. Still work in progress, but much improved
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 16 Feb 2006 10:11:48 +0000 |
| parents | c71e05b4dc2e |
| children | d910939febfa |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 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 |
| 0 | 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. |
| 0 | 9 |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
|
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13 Lesser General Public License for more details. |
| 0 | 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 |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
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23 /* An implementation of semaphores using mutexes and condition variables */ |
| 0 | 24 |
| 25 #include "SDL_thread.h" | |
| 26 #include "SDL_systhread_c.h" | |
| 27 | |
| 28 | |
| 29 struct SDL_semaphore | |
| 30 { | |
| 31 struct SignalSemaphore Sem; | |
| 32 }; | |
| 33 | |
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34 #undef D |
| 0 | 35 |
| 36 #define D(x) | |
| 37 | |
| 38 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) | |
| 39 { | |
| 40 SDL_sem *sem; | |
| 41 | |
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42 sem = (SDL_sem *)SDL_malloc(sizeof(*sem)); |
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43 |
| 0 | 44 if ( ! sem ) { |
| 45 SDL_OutOfMemory(); | |
| 46 return(0); | |
| 47 } | |
| 48 | |
| 49 D(bug("Creating semaphore %lx...\n",sem)); | |
| 50 | |
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51 SDL_memset(sem,0,sizeof(*sem)); |
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52 |
| 0 | 53 InitSemaphore(&sem->Sem); |
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54 |
| 0 | 55 return(sem); |
| 56 } | |
| 57 | |
| 58 void SDL_DestroySemaphore(SDL_sem *sem) | |
| 59 { | |
| 60 D(bug("Destroying semaphore %lx...\n",sem)); | |
| 61 | |
| 62 if ( sem ) { | |
| 63 // Condizioni per liberare i task in attesa? | |
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64 SDL_free(sem); |
| 0 | 65 } |
| 66 } | |
| 67 | |
| 68 int SDL_SemTryWait(SDL_sem *sem) | |
| 69 { | |
| 70 if ( ! sem ) { | |
| 71 SDL_SetError("Passed a NULL semaphore"); | |
| 72 return -1; | |
| 73 } | |
| 74 | |
| 75 D(bug("TryWait semaphore...%lx\n",sem)); | |
| 76 | |
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77 ObtainSemaphore(&sem->Sem); |
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78 // ReleaseSemaphore(&sem->Sem); |
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79 |
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80 return 1; |
| 0 | 81 } |
| 82 | |
| 83 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) | |
| 84 { | |
| 85 int retval; | |
| 86 | |
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87 |
| 0 | 88 if ( ! sem ) { |
| 89 SDL_SetError("Passed a NULL semaphore"); | |
| 90 return -1; | |
| 91 } | |
| 92 | |
| 93 D(bug("WaitTimeout (%ld) semaphore...%lx\n",timeout,sem)); | |
| 94 | |
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95 /* A timeout of 0 is an easy case */ |
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96 if ( timeout == 0 ) { |
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97 ObtainSemaphore(&sem->Sem); |
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New configure-based build system. Still work in progress, but much improved
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98 return 1; |
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99 } |
| 0 | 100 if(!(retval=AttemptSemaphore(&sem->Sem))) |
| 101 { | |
| 102 SDL_Delay(timeout); | |
| 103 retval=AttemptSemaphore(&sem->Sem); | |
| 104 } | |
| 105 | |
| 106 if(retval==TRUE) | |
| 107 { | |
| 108 // ReleaseSemaphore(&sem->Sem); | |
| 109 retval=1; | |
| 110 } | |
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111 |
| 0 | 112 return retval; |
| 113 } | |
| 114 | |
| 115 int SDL_SemWait(SDL_sem *sem) | |
| 116 { | |
| 117 ObtainSemaphore(&sem->Sem); | |
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118 return 0; |
| 0 | 119 } |
| 120 | |
| 121 Uint32 SDL_SemValue(SDL_sem *sem) | |
| 122 { | |
| 123 Uint32 value; | |
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124 |
| 0 | 125 value = 0; |
| 126 if ( sem ) { | |
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127 #ifdef STORMC4_WOS |
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128 value = sem->Sem.ssppc_SS.ss_NestCount; |
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129 #else |
| 0 | 130 value = sem->Sem.ss_NestCount; |
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131 #endif |
| 0 | 132 } |
| 133 return value; | |
| 134 } | |
| 135 | |
| 136 int SDL_SemPost(SDL_sem *sem) | |
| 137 { | |
| 138 if ( ! sem ) { | |
| 139 SDL_SetError("Passed a NULL semaphore"); | |
| 140 return -1; | |
| 141 } | |
| 142 D(bug("SemPost semaphore...%lx\n",sem)); | |
| 143 | |
| 144 ReleaseSemaphore(&sem->Sem); | |
| 145 return 0; | |
| 146 } | |
| 147 |