1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief RTEMS Get Region Segment |
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5 | * @ingroup ClassicRegion |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2007. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.org/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <rtems/rtems/regionimpl.h> |
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22 | #include <rtems/rtems/optionsimpl.h> |
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23 | #include <rtems/rtems/statusimpl.h> |
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24 | #include <rtems/score/threadqimpl.h> |
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25 | #include <rtems/score/statesimpl.h> |
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26 | |
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27 | static void _Region_Enqueue_callout( |
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28 | Thread_queue_Queue *queue, |
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29 | Thread_Control *the_thread, |
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30 | Per_CPU_Control *cpu_self, |
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31 | Thread_queue_Context *queue_context |
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32 | ) |
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33 | { |
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34 | Region_Control *the_region; |
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35 | |
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36 | _Thread_queue_Add_timeout_ticks( |
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37 | queue, |
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38 | the_thread, |
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39 | cpu_self, |
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40 | queue_context |
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41 | ); |
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42 | |
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43 | the_region = REGION_OF_THREAD_QUEUE_QUEUE( queue ); |
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44 | _Region_Unlock( the_region ); |
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45 | } |
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46 | |
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47 | rtems_status_code rtems_region_get_segment( |
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48 | rtems_id id, |
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49 | uintptr_t size, |
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50 | rtems_option option_set, |
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51 | rtems_interval timeout, |
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52 | void **segment |
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53 | ) |
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54 | { |
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55 | rtems_status_code status; |
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56 | Region_Control *the_region; |
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57 | |
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58 | if ( segment == NULL ) { |
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59 | return RTEMS_INVALID_ADDRESS; |
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60 | } |
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61 | |
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62 | *segment = NULL; |
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63 | |
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64 | if ( size == 0 ) { |
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65 | return RTEMS_INVALID_SIZE; |
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66 | } |
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67 | |
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68 | the_region = _Region_Get_and_lock( id ); |
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69 | |
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70 | if ( the_region == NULL ) { |
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71 | return RTEMS_INVALID_ID; |
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72 | } |
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73 | |
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74 | if ( size > the_region->maximum_segment_size ) { |
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75 | status = RTEMS_INVALID_SIZE; |
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76 | } else { |
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77 | void *the_segment; |
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78 | |
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79 | the_segment = _Region_Allocate_segment( the_region, size ); |
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80 | |
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81 | if ( the_segment != NULL ) { |
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82 | *segment = the_segment; |
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83 | status = RTEMS_SUCCESSFUL; |
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84 | } else if ( _Options_Is_no_wait( option_set ) ) { |
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85 | status = RTEMS_UNSATISFIED; |
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86 | } else { |
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87 | Thread_queue_Context queue_context; |
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88 | Thread_Control *executing; |
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89 | |
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90 | _Thread_queue_Context_initialize( &queue_context ); |
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91 | _Thread_queue_Acquire( &the_region->Wait_queue, &queue_context ); |
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92 | |
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93 | executing = _Thread_Executing; |
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94 | executing->Wait.count = size; |
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95 | executing->Wait.return_argument = segment; |
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96 | |
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97 | /* FIXME: This is a home grown condition variable */ |
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98 | _Thread_queue_Context_set_thread_state( |
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99 | &queue_context, |
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100 | STATES_WAITING_FOR_SEGMENT |
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101 | ); |
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102 | _Thread_queue_Context_set_timeout_ticks( &queue_context, timeout ); |
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103 | _Thread_queue_Context_set_enqueue_callout( |
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104 | &queue_context, |
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105 | _Region_Enqueue_callout |
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106 | ); |
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107 | _Thread_queue_Enqueue( |
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108 | &the_region->Wait_queue.Queue, |
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109 | the_region->wait_operations, |
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110 | executing, |
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111 | &queue_context |
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112 | ); |
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113 | return _Status_Get_after_wait( executing ); |
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114 | } |
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115 | } |
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116 | |
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117 | _Region_Unlock( the_region ); |
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118 | return status; |
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119 | } |
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