semaphoreimpl.h

Go to the documentation of this file.

/* SPDX-License-Identifier: BSD-2-Clause */
 
/*
 *  COPYRIGHT (c) 1989-2013.
 *  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_POSIX_SEMAPHOREIMPL_H
#define _RTEMS_POSIX_SEMAPHOREIMPL_H
 
#include <rtems/posix/semaphore.h>
#include <rtems/posix/posixapi.h>
#include <rtems/score/semaphoreimpl.h>
#include <rtems/seterr.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
#define POSIX_SEMAPHORE_MAGIC 0x5d367fe7UL
 
static inline POSIX_Semaphore_Control *
  _POSIX_Semaphore_Allocate_unprotected( void )
{
  return (POSIX_Semaphore_Control *)
    _Objects_Allocate_unprotected( &_POSIX_Semaphore_Information );
}
 
static inline void _POSIX_Semaphore_Free (
  POSIX_Semaphore_Control *the_semaphore
)
{
  _Objects_Free( &_POSIX_Semaphore_Information, &the_semaphore->Object );
}
 
static inline POSIX_Semaphore_Control *_POSIX_Semaphore_Get(
  sem_t *sem
)
{
  return RTEMS_CONTAINER_OF( sem, POSIX_Semaphore_Control, Semaphore );
}
 
static inline bool _POSIX_Semaphore_Is_named( const sem_t *sem )
{
  return sem->_Semaphore._Queue._name != NULL;
}
 
static inline bool _POSIX_Semaphore_Is_busy( const sem_t *sem )
{
  return sem->_Semaphore._Queue._heads != NULL;
}
 
static inline void _POSIX_Semaphore_Initialize(
  sem_t        *sem,
  const char   *name,
  unsigned int  value
)
{
  sem->_flags = (uintptr_t) sem ^ POSIX_SEMAPHORE_MAGIC;
  _Semaphore_Initialize_named( &sem->_Semaphore, name, value );
}
 
static inline void _POSIX_Semaphore_Destroy( sem_t *sem )
{
  sem->_flags = 0;
  _Semaphore_Destroy( &sem->_Semaphore );
}
 
void _POSIX_Semaphore_Delete( POSIX_Semaphore_Control *the_semaphore );
 
static inline void _POSIX_Semaphore_Namespace_remove (
  POSIX_Semaphore_Control *the_semaphore
)
{
  _Objects_Namespace_remove_string(
    &_POSIX_Semaphore_Information,
    &the_semaphore->Object
  );
}
 
static inline POSIX_Semaphore_Control *_POSIX_Semaphore_Get_by_name(
  const char                *name,
  size_t                    *name_length_p,
  Objects_Get_by_name_error *error
)
{
  return (POSIX_Semaphore_Control *) _Objects_Get_by_name(
    &_POSIX_Semaphore_Information,
    name,
    name_length_p,
    error
  );
}
 
#define POSIX_SEMAPHORE_VALIDATE_OBJECT( sem ) \
  do { \
    if ( \
      ( sem ) == NULL \
        || ( (uintptr_t) ( sem ) ^ POSIX_SEMAPHORE_MAGIC ) != ( sem )->_flags \
    ) { \
      rtems_set_errno_and_return_minus_one( EINVAL ); \
    } \
  } while ( 0 )
 
#ifdef __cplusplus
}
#endif
 
#endif
/*  end of include file */