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/**
* @file
*
* @ingroup RTEMSScorePerCPU
*
* @brief This source file contains the implementation of
* _Per_CPU_State_wait_for_non_initial_state().
*/
/*
* Copyright (c) 2014 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* 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 <rtems/score/percpu.h>
#include <rtems/counter.h>
bool _Per_CPU_State_wait_for_non_initial_state(
uint32_t cpu_index,
uint32_t timeout_in_ns
)
{
const Per_CPU_Control *cpu;
Per_CPU_State state;
cpu = _Per_CPU_Get_by_index( cpu_index );
state = _Per_CPU_Get_state( cpu );
if ( timeout_in_ns > 0 ) {
rtems_counter_ticks ticks =
rtems_counter_nanoseconds_to_ticks( timeout_in_ns );
rtems_counter_ticks a = rtems_counter_read();
rtems_counter_ticks delta = 0;
while ( ticks > delta && state == PER_CPU_STATE_INITIAL ) {
rtems_counter_ticks b;
state = _Per_CPU_Get_state( cpu );
ticks -= delta;
b = rtems_counter_read();
delta = rtems_counter_difference( b, a );
a = b;
}
} else {
while ( state == PER_CPU_STATE_INITIAL ) {
state = _Per_CPU_Get_state( cpu );
}
}
return state != PER_CPU_STATE_INITIAL;
}
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