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only use posix_memalign() if it's known to work, revert to memalign()

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Tue Jan 24 17:49:36 2006  Tim Janik  <timj@imendio.com>

        * glib/gslice.c: only use posix_memalign() if it's known to work,
        revert to memalign() otherwise.

        * configure.in: check for broken posix_memalign() implementations
        to fix #328254.
This commit is contained in:
Tim Janik
2006-01-24 16:56:17 +00:00
committed by Tim Janik
parent 3c62ff454a
commit 7b744cf4d2
5 changed files with 78 additions and 7 deletions
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20
glib/gslice.c
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@@ -38,6 +38,11 @@
#include <process.h>
#endif
#if defined HAVE_POSIX_MEMALIGN && defined POSIX_MEMALIGN_WITH_COMPLIANT_ALLOCS
# define HAVE_COMLIANT_POSIX_MEMALIGN 1
#endif
/* the GSlice allocator is split up into 4 layers, roughly modelled after the slab
* allocator and magazine extensions as outlined in:
* + [Bonwick94] Jeff Bonwick, The slab allocator: An object-caching kernel
@@ -292,7 +297,7 @@ g_slice_init_nomessage (void)
mem_assert ((sys_page_size & (sys_page_size - 1)) == 0);
slice_config_init (&allocator->config);
allocator->min_page_size = sys_page_size;
#if HAVE_POSIX_MEMALIGN || HAVE_MEMALIGN
#if HAVE_COMLIANT_POSIX_MEMALIGN || HAVE_MEMALIGN
/* allow allocation of pages up to 8KB (with 8KB alignment).
* this is useful because many medium to large sized structures
* fit less than 8 times (see [4]) into 4KB pages.
@@ -1022,13 +1027,14 @@ slab_allocator_free_chunk (gsize chunk_size,
#endif
/* from config.h:
* define HAVE_POSIX_MEMALIGN 1 // if free(posix_memalign(3)) works, <stdlib.h>
* define HAVE_MEMALIGN 1 // if free(memalign(3)) works, <malloc.h>
* define HAVE_VALLOC 1 // if free(valloc(3)) works, <stdlib.h> or <malloc.h>
* define HAVE_POSIX_MEMALIGN 1 // if free(posix_memalign(3)) works, <stdlib.h>
* define HAVE_COMLIANT_POSIX_MEMALIGN 1 // if free(posix_memalign(3)) works for sizes != 2^n, <stdlib.h>
* define HAVE_MEMALIGN 1 // if free(memalign(3)) works, <malloc.h>
* define HAVE_VALLOC 1 // if free(valloc(3)) works, <stdlib.h> or <malloc.h>
* if none is provided, we implement malloc(3)-based alloc-only page alignment
*/
#if !(HAVE_POSIX_MEMALIGN || HAVE_MEMALIGN || HAVE_VALLOC)
#if !(HAVE_COMLIANT_POSIX_MEMALIGN || HAVE_MEMALIGN || HAVE_VALLOC)
static GTrashStack *compat_valloc_trash = NULL;
#endif
@@ -1038,7 +1044,7 @@ allocator_memalign (gsize alignment,
{
gpointer aligned_memory = NULL;
gint err = ENOMEM;
#if HAVE_POSIX_MEMALIGN
#if HAVE_COMLIANT_POSIX_MEMALIGN
err = posix_memalign (&aligned_memory, alignment, memsize);
#elif HAVE_MEMALIGN
errno = 0;
@@ -1078,7 +1084,7 @@ static void
allocator_memfree (gsize memsize,
gpointer mem)
{
#if HAVE_POSIX_MEMALIGN || HAVE_MEMALIGN || HAVE_VALLOC
#if HAVE_COMLIANT_POSIX_MEMALIGN || HAVE_MEMALIGN || HAVE_VALLOC
free (mem);
#else
mem_assert (memsize <= sys_page_size);