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Diffstat (limited to 'cpukit/rtems/src/regionresizesegment.c')
-rw-r--r-- | cpukit/rtems/src/regionresizesegment.c | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/cpukit/rtems/src/regionresizesegment.c b/cpukit/rtems/src/regionresizesegment.c new file mode 100644 index 0000000000..b83ed2c6e6 --- /dev/null +++ b/cpukit/rtems/src/regionresizesegment.c @@ -0,0 +1,101 @@ +/* + * Region Manager + * + * + * COPYRIGHT (c) 1989-1999. + * 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> + +/*PAGE + * + * rtems_region_resize_segment + * + * This directive will try to resize segment to the new size 'size' + * "in place". + * + * Input parameters: + * id - region id + * segment - pointer to segment address + * size - new required size + * + * Output parameters: + * RTEMS_SUCCESSFUL - if successful + * error code - if unsuccessful + */ + +rtems_status_code rtems_region_resize_segment( + Objects_Id id, + void *segment, + size_t size, + size_t *old_size +) +{ + register Region_Control *the_region; + Objects_Locations location; + Heap_Resize_status status; + uint32_t avail_size; + uint32_t osize; + + if ( !old_size ) + return RTEMS_INVALID_ADDRESS; + + _RTEMS_Lock_allocator(); + the_region = _Region_Get( id, &location ); + switch ( location ) { + + case OBJECTS_REMOTE: /* this error cannot be returned */ + _RTEMS_Unlock_allocator(); + return RTEMS_INTERNAL_ERROR; + + case OBJECTS_ERROR: + _RTEMS_Unlock_allocator(); + return RTEMS_INVALID_ID; + + case OBJECTS_LOCAL: + + _Region_Debug_Walk( the_region, 7 ); + + status = _Heap_Resize_block( + &the_region->Memory, + segment, + (uint32_t) size, + &osize, + &avail_size + ); + *old_size = (uint32_t) osize; + + _Region_Debug_Walk( the_region, 8 ); + + if( status == HEAP_RESIZE_SUCCESSFUL && avail_size > 0 ) + _Region_Process_queue( the_region ); /* unlocks allocator internally */ + else + _RTEMS_Unlock_allocator(); + + return + (status == HEAP_RESIZE_SUCCESSFUL) ? RTEMS_SUCCESSFUL : + (status == HEAP_RESIZE_UNSATISFIED) ? RTEMS_UNSATISFIED : + RTEMS_INVALID_ADDRESS; + } + + return RTEMS_INTERNAL_ERROR; /* unreached - only to remove warnings */ +} |