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author | Joel Sherrill <joel.sherrill@OARcorp.com> | 2007-12-18 20:36:40 +0000 |
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committer | Joel Sherrill <joel.sherrill@OARcorp.com> | 2007-12-18 20:36:40 +0000 |
commit | 543fe820616f31350366ab61052050303d17dd25 (patch) | |
tree | a2e4702be2cd9988ed341586c1c8c976b8ba3bb8 /cpukit/libcsupport/src/realloc.c | |
parent | 2007-12-18 Joel Sherrill <joel.sherrill@OARcorp.com> (diff) | |
download | rtems-543fe820616f31350366ab61052050303d17dd25.tar.bz2 |
2007-12-18 Joel Sherrill <joel.sherrill@oarcorp.com>
* libcsupport/Makefile.am, libcsupport/preinstall.am,
libcsupport/src/malloc.c, libcsupport/src/mallocinfo.c,
libmisc/Makefile.am, libmisc/shell/main_mallocinfo.c,
libmisc/shell/shellconfig.h: Split malloc.c into multiple files with
one function per file. Also split out statistics into a separate file
which can be plugged in dynamically. Right now, it is always in. I
suspect that splitting the file removed more code than leaving
statistics in. I tinkered with malloc information command in the
shell. I resurrected the malloc arena code as malloc boundary. This
code is now compiled all the time even though it does not appear to
work.
* libcsupport/include/rtems/malloc.h, libcsupport/src/_calloc_r.c,
libcsupport/src/_free_r.c, libcsupport/src/_malloc_r.c,
libcsupport/src/_realloc_r.c, libcsupport/src/calloc.c,
libcsupport/src/free.c, libcsupport/src/malloc_boundary.c,
libcsupport/src/malloc_get_statistics.c,
libcsupport/src/malloc_initialize.c, libcsupport/src/malloc_p.h,
libcsupport/src/malloc_report_statistics.c,
libcsupport/src/malloc_report_statistics_plugin.c,
libcsupport/src/malloc_statistics_helpers.c,
libcsupport/src/malloc_walk.c, libcsupport/src/realloc.c,
libmisc/shell/main_perioduse.c: New files.
Diffstat (limited to 'cpukit/libcsupport/src/realloc.c')
-rw-r--r-- | cpukit/libcsupport/src/realloc.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/cpukit/libcsupport/src/realloc.c b/cpukit/libcsupport/src/realloc.c new file mode 100644 index 0000000000..cba244cc37 --- /dev/null +++ b/cpukit/libcsupport/src/realloc.c @@ -0,0 +1,103 @@ +/* + * calloc() + * + * 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 + +#ifdef RTEMS_NEWLIB +#include "malloc_p.h" +#include <stdlib.h> +#include <errno.h> + +void *realloc( + void *ptr, + size_t size +) +{ + size_t old_size; + char *new_area; + size_t resize; + + MSBUMP(realloc_calls, 1); + + /* + * Do not attempt to allocate memory if in a critical section or ISR. + */ + + if (_System_state_Is_up(_System_state_Get())) { + if (_Thread_Dispatch_disable_level > 0) + return (void *) 0; + + if (_ISR_Nest_level > 0) + return (void *) 0; + } + + /* + * Continue with realloc(). + */ + if ( !ptr ) + return malloc( size ); + + if ( !size ) { + free( ptr ); + return (void *) 0; + } + + /* + * If block boundary integrity checking is enabled, then + * we need to account for the boundary memory again. + */ + resize = size; + #if defined(RTEMS_MALLOC_BOUNDARY_HELPERS) + if (rtems_malloc_boundary_helpers) + resize += (*rtems_malloc_boundary_helpers->overhead)(); + #endif + + if ( _Protected_heap_Resize_block( &RTEMS_Malloc_Heap, ptr, resize ) ) { + #if defined(RTEMS_MALLOC_BOUNDARY_HELPERS) + /* + * Successful resize. Update the boundary on the same block. + */ + if (rtems_malloc_boundary_helpers) + (*rtems_malloc_boundary_helpers->at_realloc)(ptr, resize); + #endif + return ptr; + } + + /* + * There used to be a free on this error case but it is wrong to + * free the memory per OpenGroup Single UNIX Specification V2 + * and the C Standard. + */ + + new_area = malloc( size ); + + MSBUMP(malloc_calls, -1); /* subtract off the malloc */ + + if ( !new_area ) { + return (void *) 0; + } + + if ( !_Protected_heap_Get_block_size(&RTEMS_Malloc_Heap, ptr, &old_size) ) { + errno = EINVAL; + return (void *) 0; + } + + memcpy( new_area, ptr, (size < old_size) ? size : old_size ); + free( ptr ); + + return new_area; + +} +#endif |