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/**
* @file
*
* @brief Private Support Information for POSIX Shared Memory
*
*/
/*
* Copyright (c) 2016 Gedare Bloom.
*
* 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.
*/
#ifndef _RTEMS_POSIX_SHMIMPL_H
#define _RTEMS_POSIX_SHMIMPL_H
#include <rtems/fs.h>
#include <rtems/libio.h>
#include <rtems/posix/posixapi.h>
#include <rtems/posix/shm.h>
#include <rtems/score/objectimpl.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @ingroup POSIXShmPrivate
* @{
*/
RTEMS_INLINE_ROUTINE POSIX_Shm_Control *_POSIX_Shm_Allocate_unprotected( void )
{
return (POSIX_Shm_Control *)
_Objects_Allocate_unprotected( &_POSIX_Shm_Information );
}
/**
* @brief POSIX Shared Memory Free
*
* This routine frees a shm control block.
*/
RTEMS_INLINE_ROUTINE void _POSIX_Shm_Free (
POSIX_Shm_Control *the_shm
)
{
_Objects_Free( &_POSIX_Shm_Information, &the_shm->Object );
}
RTEMS_INLINE_ROUTINE POSIX_Shm_Control *_POSIX_Shm_Get_by_name(
const char *name,
size_t *name_length_p,
Objects_Get_by_name_error *error
)
{
return (POSIX_Shm_Control *) _Objects_Get_by_name(
&_POSIX_Shm_Information,
name,
name_length_p,
error
);
}
RTEMS_INLINE_ROUTINE void _POSIX_Shm_Update_atime(
POSIX_Shm_Control *shm
)
{
struct timeval now;
gettimeofday( &now, 0 );
shm->atime = now.tv_sec;
}
RTEMS_INLINE_ROUTINE void _POSIX_Shm_Update_mtime_ctime(
POSIX_Shm_Control *shm
)
{
struct timeval now;
gettimeofday( &now, 0 );
shm->mtime = now.tv_sec;
shm->ctime = now.tv_sec;
}
static inline POSIX_Shm_Control* iop_to_shm( rtems_libio_t *iop )
{
return (POSIX_Shm_Control*) iop->data1;
}
static inline POSIX_Shm_Control* loc_to_shm(
const rtems_filesystem_location_info_t *loc
)
{
return (POSIX_Shm_Control*) loc->node_access;
}
static inline int POSIX_Shm_Attempt_delete(
POSIX_Shm_Control* shm
)
{
Objects_Control *obj;
ISR_lock_Context lock_ctx;
int err;
err = 0;
_Objects_Allocator_lock();
--shm->reference_count;
if ( shm->reference_count == 0 ) {
if ( (*shm->shm_object.ops->object_delete)( &shm->shm_object ) != 0 ) {
err = EIO;
}
}
/* check if the object has been unlinked yet. */
obj = _Objects_Get( shm->Object.id, &lock_ctx, &_POSIX_Shm_Information );
if ( obj == NULL ) {
/* if it was unlinked, then it can be freed. */
_POSIX_Shm_Free( shm );
} else {
/* it will be freed when it is unlinked. */
_ISR_lock_ISR_enable( &lock_ctx );
}
_Objects_Allocator_unlock();
return err;
}
/** @} */
#ifdef __cplusplus
}
#endif
#endif
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