1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief POSIX Signals Thread Unlock |
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5 | * @ingroup POSIX_SIGNALS |
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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.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 <errno.h> |
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22 | #include <pthread.h> |
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23 | #include <signal.h> |
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24 | |
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25 | #include <rtems/system.h> |
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26 | #include <rtems/score/isr.h> |
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27 | #include <rtems/score/thread.h> |
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28 | #include <rtems/score/threadq.h> |
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29 | #include <rtems/score/watchdogimpl.h> |
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30 | #include <rtems/score/wkspace.h> |
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31 | #include <rtems/seterr.h> |
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32 | #include <rtems/posix/threadsup.h> |
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33 | #include <rtems/posix/psignalimpl.h> |
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34 | #include <rtems/posix/pthreadimpl.h> |
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35 | #include <rtems/posix/time.h> |
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36 | #include <stdio.h> |
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37 | |
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38 | bool _POSIX_signals_Unblock_thread( |
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39 | Thread_Control *the_thread, |
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40 | int signo, |
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41 | siginfo_t *info |
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42 | ) |
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43 | { |
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44 | POSIX_API_Control *api; |
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45 | sigset_t mask; |
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46 | siginfo_t *the_info = NULL; |
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47 | |
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48 | api = the_thread->API_Extensions[ THREAD_API_POSIX ]; |
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49 | |
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50 | mask = signo_to_mask( signo ); |
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51 | |
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52 | /* |
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53 | * Is the thread is specifically waiting for a signal? |
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54 | */ |
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55 | |
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56 | if ( _States_Is_interruptible_signal( the_thread->current_state ) ) { |
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57 | |
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58 | if ( (the_thread->Wait.option & mask) || (~api->signals_blocked & mask) ) { |
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59 | the_thread->Wait.return_code = EINTR; |
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60 | |
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61 | the_info = (siginfo_t *) the_thread->Wait.return_argument; |
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62 | |
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63 | if ( !info ) { |
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64 | the_info->si_signo = signo; |
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65 | the_info->si_code = SI_USER; |
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66 | the_info->si_value.sival_int = 0; |
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67 | } else { |
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68 | *the_info = *info; |
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69 | } |
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70 | |
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71 | _Thread_queue_Extract_with_proxy( the_thread ); |
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72 | return true; |
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73 | } |
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74 | |
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75 | /* |
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76 | * This should only be reached via pthread_kill(). |
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77 | */ |
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78 | |
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79 | return false; |
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80 | } |
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81 | |
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82 | /* |
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83 | * Thread is not waiting due to a sigwait. |
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84 | */ |
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85 | if ( ~api->signals_blocked & mask ) { |
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86 | |
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87 | /* |
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88 | * The thread is interested in this signal. We are going |
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89 | * to post it. We have a few broad cases: |
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90 | * + If it is blocked on an interruptible signal, THEN |
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91 | * we unblock the thread. |
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92 | * + If it is in the ready state AND |
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93 | * we are sending from an ISR AND |
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94 | * it is the interrupted thread AND |
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95 | * it is not blocked, THEN |
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96 | * we need to dispatch at the end of this ISR. |
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97 | * + Any other combination, do nothing. |
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98 | */ |
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99 | |
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100 | if ( _States_Is_interruptible_by_signal( the_thread->current_state ) ) { |
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101 | the_thread->Wait.return_code = EINTR; |
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102 | /* |
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103 | * In pthread_cond_wait, a thread will be blocking on a thread |
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104 | * queue, but is also interruptible by a POSIX signal. |
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105 | */ |
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106 | if ( _States_Is_waiting_on_thread_queue(the_thread->current_state) ) |
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107 | _Thread_queue_Extract_with_proxy( the_thread ); |
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108 | else if ( _States_Is_delaying(the_thread->current_state) ) { |
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109 | (void) _Watchdog_Remove( &the_thread->Timer ); |
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110 | _Thread_Unblock( the_thread ); |
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111 | } |
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112 | |
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113 | } else if ( the_thread->current_state == STATES_READY ) { |
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114 | if ( _ISR_Is_in_progress() && _Thread_Is_executing( the_thread ) ) |
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115 | _Thread_Dispatch_necessary = true; |
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116 | } |
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117 | } |
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118 | return false; |
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119 | } |
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