lib/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2025-08-07 06:43:00 +03:00
Code Activity

support: Add support_blob_repeat_allocate_shared

Browse Source 
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Florian Weimer
2020-05-12 19:01:49 +02:00
parent 4cab20fa49
commit 0e28cfff9d
3 changed files with 68 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files

31
support/blob_repeat.c
View File

@@ -125,10 +125,11 @@ minimum_stride_size (size_t page_size, size_t element_size)
}
/* Allocations larger than maximum_small_size potentially use mmap
with alias mappings. */
with alias mappings. If SHARED, the alias mappings are created
using MAP_SHARED instead of MAP_PRIVATE. */
static struct support_blob_repeat
allocate_big (size_t total_size, const void *element, size_t element_size,
size_t count)
size_t count, bool shared)
{
unsigned long page_size = xsysconf (_SC_PAGESIZE);
size_t stride_size = minimum_stride_size (page_size, element_size);
@@ -213,7 +214,11 @@ allocate_big (size_t total_size, const void *element, size_t element_size,
{
size_t remaining_size = total_size;
char *current = target;
int flags = MAP_FIXED | MAP_FILE | MAP_PRIVATE;
int flags = MAP_FIXED | MAP_FILE;
if (shared)
flags |= MAP_SHARED;
else
flags |= MAP_PRIVATE;
#ifdef MAP_NORESERVE
flags |= MAP_NORESERVE;
#endif
@@ -251,8 +256,8 @@ allocate_big (size_t total_size, const void *element, size_t element_size,
}
struct support_blob_repeat
support_blob_repeat_allocate (const void *element, size_t element_size,
size_t count)
repeat_allocate (const void *element, size_t element_size,
size_t count, bool shared)
{
size_t total_size;
if (__builtin_mul_overflow (element_size, count, &total_size))
@@ -263,7 +268,21 @@ support_blob_repeat_allocate (const void *element, size_t element_size,
if (total_size <= maximum_small_size)
return allocate_malloc (total_size, element, element_size, count);
else
return allocate_big (total_size, element, element_size, count);
return allocate_big (total_size, element, element_size, count, shared);
}
struct support_blob_repeat
support_blob_repeat_allocate (const void *element, size_t element_size,
size_t count)
{
return repeat_allocate (element, element_size, count, false);
}
struct support_blob_repeat
support_blob_repeat_allocate_shared (const void *element, size_t element_size,
size_t count)
{
return repeat_allocate (element, element_size, count, true);
}
void