1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief POSIX Thread Exit Shared Helper |
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5 | * @ingroup POSIX_THREAD Thread API Extension |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2011. |
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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 <pthread.h> |
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22 | |
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23 | #include <rtems/posix/pthreadimpl.h> |
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24 | #include <rtems/score/apimutex.h> |
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25 | #include <rtems/score/threadimpl.h> |
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26 | #include <rtems/score/threadqimpl.h> |
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27 | |
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28 | void _POSIX_Thread_Exit( |
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29 | Thread_Control *the_thread, |
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30 | void *value_ptr |
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31 | ) |
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32 | { |
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33 | Objects_Information *the_information; |
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34 | Thread_Control *unblocked; |
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35 | POSIX_API_Control *api; |
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36 | |
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37 | the_information = _Objects_Get_information_id( the_thread->Object.id ); |
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38 | |
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39 | api = the_thread->API_Extensions[ THREAD_API_POSIX ]; |
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40 | |
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41 | |
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42 | /* |
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43 | * The_information has to be non-NULL. Otherwise, we couldn't be |
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44 | * running in a thread of this API and class. |
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45 | * |
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46 | * NOTE: Lock and unlock in different order so we do not throw a |
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47 | * fatal error when locking the allocator mutex. And after |
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48 | * we unlock, we want to defer the context switch until we |
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49 | * are ready to be switched out. Otherwise, an ISR could |
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50 | * occur and preempt us out while we still hold the |
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51 | * allocator mutex. |
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52 | */ |
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53 | |
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54 | _RTEMS_Lock_allocator(); |
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55 | _Thread_Disable_dispatch(); |
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56 | |
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57 | the_thread->Wait.return_argument = value_ptr; |
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58 | |
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59 | /* |
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60 | * Process join |
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61 | */ |
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62 | if ( api->detachstate == PTHREAD_CREATE_JOINABLE ) { |
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63 | unblocked = _Thread_queue_Dequeue( &api->Join_List ); |
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64 | if ( unblocked ) { |
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65 | do { |
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66 | *(void **)unblocked->Wait.return_argument = value_ptr; |
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67 | } while ( (unblocked = _Thread_queue_Dequeue( &api->Join_List )) ); |
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68 | } else { |
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69 | _Thread_Set_state( |
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70 | the_thread, |
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71 | STATES_WAITING_FOR_JOIN_AT_EXIT | STATES_TRANSIENT |
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72 | ); |
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73 | /* FIXME: Lock order reversal */ |
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74 | _RTEMS_Unlock_allocator(); |
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75 | _Thread_Enable_dispatch(); |
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76 | /* now waiting for thread to arrive */ |
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77 | _RTEMS_Lock_allocator(); |
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78 | _Thread_Disable_dispatch(); |
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79 | } |
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80 | } |
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81 | |
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82 | /* |
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83 | * Now shut down the thread |
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84 | */ |
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85 | _Thread_Close( the_information, the_thread ); |
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86 | |
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87 | _POSIX_Threads_Free( the_thread ); |
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88 | |
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89 | /* FIXME: Lock order reversal */ |
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90 | _RTEMS_Unlock_allocator(); |
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91 | _Thread_Enable_dispatch(); |
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92 | } |
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93 | |
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94 | void pthread_exit( |
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95 | void *value_ptr |
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96 | ) |
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97 | { |
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98 | _POSIX_Thread_Exit( _Thread_Get_executing(), value_ptr ); |
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99 | } |
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