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/**
* @file
*
* @brief Implements wake up version of the "signal" operation
* @ingroup POSIX_COND_VARS Condition Variables
*/
/*
* COPYRIGHT (c) 1989-2014.
* On-Line Applications Research Corporation (OAR).
*
* 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.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/posix/condimpl.h>
/*
* _POSIX_Condition_variables_Signal_support
*
* A support routine which implements guts of the broadcast and single task
* wake up version of the "signal" operation.
*/
int _POSIX_Condition_variables_Signal_support(
pthread_cond_t *cond,
bool is_broadcast
)
{
Thread_Control *the_thread;
do {
POSIX_Condition_variables_Control *the_cond;
Thread_queue_Context queue_context;
the_cond = _POSIX_Condition_variables_Get( cond, &queue_context );
if ( the_cond == NULL ) {
return EINVAL;
}
_POSIX_Condition_variables_Acquire_critical( the_cond, &queue_context );
the_thread = _Thread_queue_First_locked(
&the_cond->Wait_queue,
POSIX_CONDITION_VARIABLES_TQ_OPERATIONS
);
if ( the_thread != NULL ) {
_Thread_queue_Extract_critical(
&the_cond->Wait_queue.Queue,
POSIX_CONDITION_VARIABLES_TQ_OPERATIONS,
the_thread,
&queue_context
);
} else {
the_cond->mutex = POSIX_CONDITION_VARIABLES_NO_MUTEX;
_POSIX_Condition_variables_Release( the_cond, &queue_context );
}
} while ( is_broadcast && the_thread != NULL );
return 0;
}
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