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/*
* Region Manager
*
*
* COPYRIGHT (c) 1989-2007.
* 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.
*
* $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/system.h>
#include <rtems/rtems/status.h>
#include <rtems/rtems/support.h>
#include <rtems/score/object.h>
#include <rtems/rtems/options.h>
#include <rtems/rtems/region.h>
#include <rtems/score/states.h>
#include <rtems/score/thread.h>
#include <rtems/score/apimutex.h>
/*
* rtems_region_get_segment
*
* This directive will obtain a segment from the given region.
*
* Input parameters:
* id - region id
* size - segment size in bytes
* option_set - wait option
* timeout - number of ticks to wait (0 means wait forever)
* segment - pointer to segment address
*
* Output parameters:
* segment - pointer to segment address filled in
* RTEMS_SUCCESSFUL - if successful
* error code - if unsuccessful
*/
rtems_status_code rtems_region_get_segment(
rtems_id id,
uintptr_t size,
rtems_option option_set,
rtems_interval timeout,
void **segment
)
{
Thread_Control *executing;
Objects_Locations location;
rtems_status_code return_status;
Region_Control *the_region;
void *the_segment;
if ( !segment )
return RTEMS_INVALID_ADDRESS;
*segment = NULL;
if ( size == 0 )
return RTEMS_INVALID_SIZE;
_RTEMS_Lock_allocator();
executing = _Thread_Executing;
the_region = _Region_Get( id, &location );
switch ( location ) {
case OBJECTS_LOCAL:
if ( size > the_region->maximum_segment_size )
return_status = RTEMS_INVALID_SIZE;
else {
_Region_Debug_Walk( the_region, 1 );
the_segment = _Region_Allocate_segment( the_region, size );
_Region_Debug_Walk( the_region, 2 );
if ( the_segment ) {
the_region->number_of_used_blocks += 1;
*segment = the_segment;
return_status = RTEMS_SUCCESSFUL;
} else if ( _Options_Is_no_wait( option_set ) ) {
return_status = RTEMS_UNSATISFIED;
} else {
/*
* Switch from using the memory allocation mutex to using a
* dispatching disabled critical section. We have to do this
* because this thread is going to block.
*/
_Thread_Disable_dispatch();
_RTEMS_Unlock_allocator();
executing->Wait.queue = &the_region->Wait_queue;
executing->Wait.id = id;
executing->Wait.count = size;
executing->Wait.return_argument = segment;
_Thread_queue_Enter_critical_section( &the_region->Wait_queue );
_Thread_queue_Enqueue( &the_region->Wait_queue, timeout );
_Thread_Enable_dispatch();
return (rtems_status_code) executing->Wait.return_code;
}
}
break;
#if defined(RTEMS_MULTIPROCESSING)
case OBJECTS_REMOTE: /* this error cannot be returned */
break;
#endif
case OBJECTS_ERROR:
default:
return_status = RTEMS_INVALID_ID;
break;
}
_RTEMS_Unlock_allocator();
return return_status;
}
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