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/**
* @file
*
* @ingroup POSIXAPI
*
* @brief Suspends Execution of Calling Thread until Target Thread Terminates
*/
/*
* 16.1.3 Wait for Thread Termination, P1003.1c/Draft 10, p. 147
*
* COPYRIGHT (c) 1989-2014.
* On-Line Applications Research Corporation (OAR).
*
* Copyright (c) 2016 embedded brains GmbH.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <pthread.h>
#include <errno.h>
#include <rtems/posix/threadsup.h>
#include <rtems/posix/posixapi.h>
#include <rtems/score/threadimpl.h>
#include <rtems/score/statesimpl.h>
static int _POSIX_Threads_Join( pthread_t thread, void **value_ptr )
{
Thread_Control *the_thread;
Thread_queue_Context queue_context;
Per_CPU_Control *cpu_self;
Thread_Control *executing;
void *value;
_Thread_queue_Context_initialize( &queue_context );
_Thread_queue_Context_set_enqueue_do_nothing_extra( &queue_context );
the_thread = _Thread_Get( thread, &queue_context.Lock_context.Lock_context );
if ( the_thread == NULL ) {
return ESRCH;
}
cpu_self = _Per_CPU_Get();
executing = _Per_CPU_Get_executing( cpu_self );
if ( executing == the_thread ) {
_ISR_lock_ISR_enable( &queue_context.Lock_context.Lock_context );
return EDEADLK;
}
_Thread_State_acquire_critical(
the_thread,
&queue_context.Lock_context.Lock_context
);
if ( !_Thread_Is_joinable( the_thread ) ) {
_Thread_State_release( the_thread, &queue_context.Lock_context.Lock_context );
return EINVAL;
}
if ( _States_Is_waiting_for_join_at_exit( the_thread->current_state ) ) {
value = the_thread->Life.exit_value;
_Thread_Clear_state_locked( the_thread, STATES_WAITING_FOR_JOIN_AT_EXIT );
_Thread_Dispatch_disable_with_CPU(
cpu_self,
&queue_context.Lock_context.Lock_context
);
_Thread_State_release( the_thread, &queue_context.Lock_context.Lock_context );
_Thread_Dispatch_direct( cpu_self );
} else {
_Thread_Join(
the_thread,
STATES_INTERRUPTIBLE_BY_SIGNAL | STATES_WAITING_FOR_JOIN,
executing,
&queue_context
);
if ( _POSIX_Get_error_after_wait( executing ) != 0 ) {
_Assert( _POSIX_Get_error_after_wait( executing ) == EINTR );
return EINTR;
}
value = executing->Wait.return_argument;
}
if ( value_ptr != NULL ) {
*value_ptr = value;
}
return 0;
}
int pthread_join( pthread_t thread, void **value_ptr )
{
int error;
do {
error = _POSIX_Threads_Join( thread, value_ptr );
} while ( error == EINTR );
return error;
}
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