coresemimpl.h

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/* SPDX-License-Identifier: BSD-2-Clause */

 
/*
 *  COPYRIGHT (c) 1989-2006.
 *  On-Line Applications Research Corporation (OAR).
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
 
#ifndef _RTEMS_SCORE_CORESEMIMPL_H
#define _RTEMS_SCORE_CORESEMIMPL_H
 
#include <rtems/score/coresem.h>
#include <rtems/score/objectimpl.h>
#include <rtems/score/threaddispatch.h>
#include <rtems/score/threadimpl.h>
#include <rtems/score/threadqimpl.h>
#include <rtems/score/statesimpl.h>
#include <rtems/score/status.h>
 
#ifdef __cplusplus
extern "C" {
#endif


void _CORE_semaphore_Initialize(
  CORE_semaphore_Control *the_semaphore,
  uint32_t                initial_value
);

static inline void _CORE_semaphore_Acquire_critical(
  CORE_semaphore_Control *the_semaphore,
  Thread_queue_Context   *queue_context
)
{
  _Thread_queue_Acquire_critical( &the_semaphore->Wait_queue, queue_context );
}

static inline void _CORE_semaphore_Release(
  CORE_semaphore_Control *the_semaphore,
  Thread_queue_Context   *queue_context
)
{
  _Thread_queue_Release( &the_semaphore->Wait_queue, queue_context );
}

static inline void _CORE_semaphore_Destroy(
  CORE_semaphore_Control        *the_semaphore,
  const Thread_queue_Operations *operations,
  Thread_queue_Context          *queue_context
)
{
  _Thread_queue_Flush_critical(
    &the_semaphore->Wait_queue.Queue,
    operations,
    _Thread_queue_Flush_status_object_was_deleted,
    queue_context
  );
  _Thread_queue_Destroy( &the_semaphore->Wait_queue );
}

static inline Status_Control _CORE_semaphore_Surrender(
  CORE_semaphore_Control        *the_semaphore,
  const Thread_queue_Operations *operations,
  uint32_t                       maximum_count,
  Thread_queue_Context          *queue_context
)
{
  Status_Control      status;
  Thread_queue_Heads *heads;
 
  status = STATUS_SUCCESSFUL;
 
  _CORE_semaphore_Acquire_critical( the_semaphore, queue_context );
 
  heads = the_semaphore->Wait_queue.Queue.heads;
 
  if ( heads != NULL ) {
    _Thread_queue_Surrender_no_priority(
      &the_semaphore->Wait_queue.Queue,
      heads,
      queue_context,
      operations
    );
  } else {
    if ( the_semaphore->count < maximum_count )
      the_semaphore->count += 1;
    else
      status = STATUS_MAXIMUM_COUNT_EXCEEDED;
 
    _CORE_semaphore_Release( the_semaphore, queue_context );
  }
 
  return status;
}

static inline uint32_t  _CORE_semaphore_Get_count(
  const CORE_semaphore_Control *the_semaphore
)
{
  return the_semaphore->count;
}

static inline Status_Control _CORE_semaphore_Seize(
  CORE_semaphore_Control        *the_semaphore,
  const Thread_queue_Operations *operations,
  Thread_Control                *executing,
  bool                           wait,
  Thread_queue_Context          *queue_context
)
{
  _Assert( _ISR_Get_level() != 0 );
 
  _CORE_semaphore_Acquire_critical( the_semaphore, queue_context );
  if ( the_semaphore->count != 0 ) {
    the_semaphore->count -= 1;
    _CORE_semaphore_Release( the_semaphore, queue_context );
    return STATUS_SUCCESSFUL;
  }
 
  if ( !wait ) {
    _CORE_semaphore_Release( the_semaphore, queue_context );
    return STATUS_UNSATISFIED;
  }
 
  _Thread_queue_Context_set_thread_state(
    queue_context,
    STATES_WAITING_FOR_SEMAPHORE
  );
  _Thread_queue_Enqueue(
    &the_semaphore->Wait_queue.Queue,
    operations,
    executing,
    queue_context
  );
  return _Thread_Wait_get_status( executing );
}

 
#ifdef __cplusplus
}
#endif
 
#endif
/* end of include file */