Last change
on this file since 6c66bbb was
6c66bbb,
checked in by Sebastian Huber <sebastian.huber@…>, on 04/20/21 at 07:58:06
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malloc: Hide RTEMS_Malloc_Sbrk_amount
Move RTEMS_Malloc_Sbrk_amount to the only implementation file which uses
it and make it private to hide implementation-details from an API
header.
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-
Property mode set to
100644
|
File size:
1.4 KB
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Rev | Line | |
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[17c6ad6a] | 1 | /** |
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| 2 | * @file |
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| 3 | * |
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| 4 | * @brief RTEMS Extend Heap via Sbrk |
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| 5 | * @ingroup MallocSupport |
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| 6 | */ |
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| 7 | |
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[47a3cd8] | 8 | /* |
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| 9 | * Copyright (c) 2012 embedded brains GmbH. All rights reserved. |
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| 10 | * |
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| 11 | * embedded brains GmbH |
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| 12 | * Obere Lagerstr. 30 |
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| 13 | * 82178 Puchheim |
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| 14 | * Germany |
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| 15 | * <rtems@embedded-brains.de> |
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| 16 | * |
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| 17 | * The license and distribution terms for this file may be |
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| 18 | * found in the file LICENSE in this distribution or at |
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[c499856] | 19 | * http://www.rtems.org/license/LICENSE. |
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[47a3cd8] | 20 | */ |
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| 21 | |
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[80cf60e] | 22 | #ifdef HAVE_CONFIG_H |
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| 23 | #include "config.h" |
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[47a3cd8] | 24 | #endif |
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| 25 | |
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| 26 | #include <unistd.h> |
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| 27 | |
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| 28 | #include <rtems/malloc.h> |
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| 29 | |
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| 30 | #include "malloc_p.h" |
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| 31 | |
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[6c66bbb] | 32 | static ptrdiff_t RTEMS_Malloc_Sbrk_amount; |
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| 33 | |
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| 34 | void rtems_heap_set_sbrk_amount( ptrdiff_t sbrk_amount ) |
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| 35 | { |
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| 36 | RTEMS_Malloc_Sbrk_amount = sbrk_amount; |
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| 37 | } |
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[47a3cd8] | 38 | |
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| 39 | void *rtems_heap_extend_via_sbrk( |
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| 40 | Heap_Control *heap, |
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| 41 | size_t alloc_size |
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| 42 | ) |
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| 43 | { |
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| 44 | ptrdiff_t sbrk_amount = RTEMS_Malloc_Sbrk_amount; |
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| 45 | ptrdiff_t sbrk_size = (ptrdiff_t) alloc_size; |
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[b71336c] | 46 | ptrdiff_t misaligned = sbrk_amount != 0 ? sbrk_size % sbrk_amount : 0; |
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[47a3cd8] | 47 | void *return_this = NULL; |
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| 48 | |
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| 49 | if ( misaligned != 0 ) { |
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| 50 | sbrk_size += sbrk_amount - misaligned; |
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| 51 | } |
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| 52 | |
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| 53 | if ( sbrk_size > 0 && sbrk_amount > 0 ) { |
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| 54 | void *area_begin = sbrk( sbrk_size ); |
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| 55 | |
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| 56 | if ( area_begin != (void *) -1 ) { |
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| 57 | bool ok = _Protected_heap_Extend( heap, area_begin, sbrk_size ); |
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| 58 | |
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| 59 | if ( ok ) { |
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| 60 | return_this = _Protected_heap_Allocate( heap, alloc_size ); |
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| 61 | } else { |
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| 62 | sbrk( -sbrk_size ); |
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| 63 | } |
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| 64 | } |
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| 65 | } |
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| 66 | |
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| 67 | return return_this; |
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| 68 | } |
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