1 | /* |
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2 | * COPYRIGHT (c) 1989-1999. |
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3 | * On-Line Applications Research Corporation (OAR). |
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4 | * |
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5 | * The license and distribution terms for this file may be |
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6 | * found in the file LICENSE in this distribution or at |
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7 | * http://www.rtems.com/license/LICENSE. |
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8 | * |
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9 | * $Id$ |
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10 | */ |
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11 | |
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12 | #if HAVE_CONFIG_H |
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13 | #include "config.h" |
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14 | #endif |
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15 | |
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16 | #include <rtems/itron.h> |
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17 | |
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18 | #include <rtems/itron/semaphore.h> |
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19 | #include <rtems/itron/task.h> |
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20 | #include <rtems/score/tod.h> |
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21 | |
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22 | /* |
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23 | * cre_sem - Create Semaphore |
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24 | * |
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25 | * This function implements the ITRON 3.0 cre_sem() service. |
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26 | */ |
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27 | |
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28 | ER cre_sem( |
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29 | ID semid, |
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30 | T_CSEM *pk_csem |
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31 | ) |
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32 | { |
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33 | CORE_semaphore_Attributes the_semaphore_attributes; |
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34 | ITRON_Semaphore_Control *the_semaphore; |
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35 | |
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36 | /* |
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37 | * Bad pointer to the attributes structure |
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38 | */ |
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39 | |
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40 | if ( !pk_csem ) |
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41 | return E_PAR; |
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42 | |
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43 | /* |
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44 | * Bits were set that were note defined. |
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45 | */ |
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46 | |
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47 | if ( pk_csem->sematr & _ITRON_SEMAPHORE_UNUSED_ATTRIBUTES ) |
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48 | return E_RSATR; |
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49 | |
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50 | /* |
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51 | * Initial semaphore count exceeds the maximum. |
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52 | */ |
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53 | |
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54 | if ( pk_csem->isemcnt > pk_csem->maxsem ) |
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55 | return E_PAR; |
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56 | |
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57 | /* |
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58 | * This error is not in the specification but this condition |
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59 | * does not make sense. |
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60 | */ |
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61 | |
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62 | if ( pk_csem->maxsem == 0 ) |
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63 | return E_PAR; |
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64 | |
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65 | _Thread_Disable_dispatch(); /* prevents deletion */ |
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66 | |
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67 | the_semaphore = _ITRON_Semaphore_Allocate( semid ); |
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68 | if ( !the_semaphore ) { |
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69 | _Thread_Enable_dispatch(); |
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70 | return _ITRON_Semaphore_Clarify_allocation_id_error( semid ); |
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71 | } |
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72 | |
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73 | if ( pk_csem->sematr & TA_TPRI ) |
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74 | the_semaphore_attributes.discipline = CORE_SEMAPHORE_DISCIPLINES_PRIORITY; |
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75 | else |
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76 | the_semaphore_attributes.discipline = CORE_SEMAPHORE_DISCIPLINES_FIFO; |
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77 | |
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78 | the_semaphore_attributes.maximum_count = pk_csem->maxsem; |
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79 | |
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80 | _CORE_semaphore_Initialize( |
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81 | &the_semaphore->semaphore, |
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82 | &the_semaphore_attributes, |
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83 | pk_csem->isemcnt |
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84 | ); |
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85 | |
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86 | _ITRON_Objects_Open( &_ITRON_Semaphore_Information, &the_semaphore->Object ); |
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87 | |
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88 | /* |
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89 | * If multiprocessing were supported, this is where we would announce |
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90 | * the existence of the semaphore to the rest of the system. |
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91 | */ |
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92 | |
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93 | #if defined(RTEMS_MULTIPROCESSING) |
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94 | #endif |
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95 | |
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96 | _Thread_Enable_dispatch(); |
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97 | return E_OK; |
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98 | } |
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