rtems/src/regionresizesegment.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup RTEMSImplClassicRegion
0007  *
0008  * @brief This source file contains the implementation of
0009  *   rtems_region_resize_segment().
0010  */
0011
0012 /*
0013  *  COPYRIGHT (c) 1989-2014.
0014  *  On-Line Applications Research Corporation (OAR).
0015  *
0016  * Redistribution and use in source and binary forms, with or without
0017  * modification, are permitted provided that the following conditions
0018  * are met:
0019  * 1. Redistributions of source code must retain the above copyright
0020  *    notice, this list of conditions and the following disclaimer.
0021  * 2. Redistributions in binary form must reproduce the above copyright
0022  *    notice, this list of conditions and the following disclaimer in the
0023  *    documentation and/or other materials provided with the distribution.
0024  *
0025  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0026  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0027  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0028  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0029  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0030  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0031  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0032  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0033  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0034  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0035  * POSSIBILITY OF SUCH DAMAGE.
0036  */
0037
0038 #ifdef HAVE_CONFIG_H
0039 #include "config.h"
0040 #endif
0041
0042 #include <rtems/rtems/regionimpl.h>
0043
0044 rtems_status_code rtems_region_resize_segment(
0045   rtems_id    id,
0046   void       *segment,
0047   uintptr_t   size,
0048   uintptr_t  *old_size
0049 )
0050 {
0051   uintptr_t           avail_size;
0052   uintptr_t           osize;
0053   rtems_status_code   status;
0054   Heap_Resize_status  resize_status;
0055   Region_Control     *the_region;
0056
0057   if ( old_size == NULL ) {
0058     return RTEMS_INVALID_ADDRESS;
0059   }
0060
0061   the_region = _Region_Get_and_lock( id );
0062
0063   if ( the_region == NULL ) {
0064     return RTEMS_INVALID_ID;
0065   }
0066
0067   resize_status = _Heap_Resize_block(
0068     &the_region->Memory,
0069     segment,
0070     (uint32_t) size,
0071     &osize,
0072     &avail_size
0073   );
0074   *old_size = (uint32_t) osize;
0075
0076   switch ( resize_status ) {
0077     case HEAP_RESIZE_SUCCESSFUL:
0078       /* Unlocks allocator */
0079       _Region_Process_queue( the_region );
0080       return RTEMS_SUCCESSFUL;
0081
0082     case HEAP_RESIZE_UNSATISFIED:
0083       status = RTEMS_UNSATISFIED;
0084       break;
0085
0086     default:
0087       status = RTEMS_INVALID_ADDRESS;
0088       break;
0089   }
0090
0091   _Region_Unlock( the_region );
0092   return status;
0093 }