1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Removes Routine from Top of Calling Thread's stack and Invoke it |
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5 | * @ingroup POSIXAPI |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2008. |
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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.com/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/score/thread.h> |
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24 | #include <rtems/score/threaddispatch.h> |
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25 | #include <rtems/posix/threadsup.h> |
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26 | |
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27 | #ifndef HAVE_STRUCT__PTHREAD_CLEANUP_CONTEXT |
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28 | |
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29 | #include <rtems/score/chainimpl.h> |
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30 | #include <rtems/score/isr.h> |
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31 | #include <rtems/score/wkspace.h> |
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32 | #include <rtems/posix/cancel.h> |
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33 | #include <rtems/posix/pthreadimpl.h> |
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34 | |
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35 | /* |
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36 | * 18.2.3.1 Establishing Cancellation Handlers, P1003.1c/Draft 10, p. 184 |
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37 | */ |
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38 | |
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39 | void pthread_cleanup_pop( |
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40 | int execute |
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41 | ) |
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42 | { |
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43 | POSIX_Cancel_Handler_control *handler; |
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44 | POSIX_Cancel_Handler_control tmp_handler; |
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45 | Chain_Control *handler_stack; |
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46 | POSIX_API_Control *thread_support; |
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47 | ISR_Level level; |
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48 | |
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49 | thread_support = _Thread_Executing->API_Extensions[ THREAD_API_POSIX ]; |
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50 | |
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51 | handler_stack = &thread_support->Cancellation_Handlers; |
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52 | |
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53 | /* |
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54 | * We need interrupts disabled to safely check the chain and pull |
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55 | * the last element off. But we also need dispatching disabled to |
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56 | * ensure that we do not get prempted and deleted while we are holding |
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57 | * memory that needs to be freed. |
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58 | */ |
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59 | |
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60 | _Thread_Disable_dispatch(); |
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61 | _ISR_Disable( level ); |
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62 | |
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63 | if ( _Chain_Is_empty( handler_stack ) ) { |
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64 | _Thread_Enable_dispatch(); |
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65 | _ISR_Enable( level ); |
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66 | return; |
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67 | } |
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68 | |
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69 | handler = (POSIX_Cancel_Handler_control *) |
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70 | _Chain_Tail( handler_stack )->previous; |
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71 | _Chain_Extract_unprotected( &handler->Node ); |
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72 | |
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73 | _ISR_Enable( level ); |
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74 | |
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75 | tmp_handler = *handler; |
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76 | |
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77 | _Workspace_Free( handler ); |
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78 | |
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79 | _Thread_Enable_dispatch(); |
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80 | |
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81 | if ( execute ) |
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82 | (*tmp_handler.routine)( tmp_handler.arg ); |
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83 | } |
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84 | |
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85 | #else /* HAVE_STRUCT__PTHREAD_CLEANUP_CONTEXT */ |
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86 | |
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87 | void _pthread_cleanup_pop( |
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88 | struct _pthread_cleanup_context *context, |
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89 | int execute |
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90 | ) |
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91 | { |
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92 | POSIX_API_Control *thread_support; |
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93 | |
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94 | if ( execute != 0 ) { |
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95 | ( *context->_routine )( context->_arg ); |
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96 | } |
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97 | |
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98 | _Thread_Disable_dispatch(); |
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99 | |
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100 | thread_support = _Thread_Executing->API_Extensions[ THREAD_API_POSIX ]; |
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101 | thread_support->last_cleanup_context = context->_previous; |
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102 | |
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103 | _Thread_Enable_dispatch(); |
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104 | } |
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105 | |
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106 | #endif /* HAVE_STRUCT__PTHREAD_CLEANUP_CONTEXT */ |
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