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/**
* @file
*
* @brief Initialize a Core Mutex
* @ingroup ScoreMutex
*/
/*
* COPYRIGHT (c) 1989-1999.
* 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.com/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/system.h>
#include <rtems/score/isr.h>
#include <rtems/score/coremuteximpl.h>
#include <rtems/score/states.h>
#include <rtems/score/thread.h>
#include <rtems/score/threadq.h>
CORE_mutex_Status _CORE_mutex_Initialize(
CORE_mutex_Control *the_mutex,
Thread_Control *executing,
const CORE_mutex_Attributes *the_mutex_attributes,
uint32_t initial_lock
)
{
/* Add this to the RTEMS environment later ?????????
rtems_assert( initial_lock == CORE_MUTEX_LOCKED ||
initial_lock == CORE_MUTEX_UNLOCKED );
*/
the_mutex->Attributes = *the_mutex_attributes;
the_mutex->lock = initial_lock;
the_mutex->blocked_count = 0;
if ( initial_lock == CORE_MUTEX_LOCKED ) {
the_mutex->nest_count = 1;
the_mutex->holder = executing;
the_mutex->holder_id = executing->Object.id;
if ( _CORE_mutex_Is_inherit_priority( &the_mutex->Attributes ) ||
_CORE_mutex_Is_priority_ceiling( &the_mutex->Attributes ) ) {
if ( executing->current_priority <
the_mutex->Attributes.priority_ceiling )
return CORE_MUTEX_STATUS_CEILING_VIOLATED;
#ifdef __RTEMS_STRICT_ORDER_MUTEX__
_Chain_Prepend_unprotected( &executing->lock_mutex,
&the_mutex->queue.lock_queue );
the_mutex->queue.priority_before = executing->current_priority;
#endif
executing->resource_count++;
}
} else {
the_mutex->nest_count = 0;
the_mutex->holder = NULL;
the_mutex->holder_id = 0;
}
_Thread_queue_Initialize(
&the_mutex->Wait_queue,
_CORE_mutex_Is_fifo( the_mutex_attributes ) ?
THREAD_QUEUE_DISCIPLINE_FIFO : THREAD_QUEUE_DISCIPLINE_PRIORITY,
STATES_WAITING_FOR_MUTEX,
CORE_MUTEX_TIMEOUT
);
return CORE_MUTEX_STATUS_SUCCESSFUL;
}
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