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malloc: avoid global locks in tst-aligned_alloc-lib.c

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Make sure the DSO used by aligned_alloc/calloc/malloc tests does not get
a global lock on multithreaded tests.
Reviewed-by: Arjun Shankar <arjun@redhat.com>
This commit is contained in:
Miguel Martín 2024-07-16 17:14:56 +02:00 committed by Arjun Shankar
parent 4dc22baa84
commit 9a27b566b2
1 changed files with 20 additions and 19 deletions
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39
malloc/tst-aligned_alloc-lib.c
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@ -17,37 +17,38 @@
License along with the GNU C Library; see the file COPYING.LIB. If License along with the GNU C Library; see the file COPYING.LIB. If
not, see <https://www.gnu.org/licenses/>. */ not, see <https://www.gnu.org/licenses/>. */
#include <array_length.h>
#include <libc-symbols.h> #include <libc-symbols.h>
#include <stdlib.h> #include <stdlib.h>
#include <time.h>
extern void *__libc_malloc (size_t size); extern void *__libc_malloc (size_t size);
extern void *__libc_calloc (size_t n, size_t size); extern void *__libc_calloc (size_t n, size_t size);
__thread unsigned int seed = 0;
int aligned_alloc_count = 0; int aligned_alloc_count = 0;
int libc_malloc_count = 0; int libc_malloc_count = 0;
int libc_calloc_count = 0; int libc_calloc_count = 0;
/* Get a random alignment value. Biased towards the smaller values. Must be static void *
a power of 2. */ get_random_alloc (size_t size)
static size_t get_random_alignment (void)
{
size_t aligns[] = {
1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384
};
return aligns[random () % array_length (aligns)];
}
static void *get_random_alloc (size_t size)
{ {
void *retval; void *retval;
size_t align; size_t align;
struct timespec tp;
switch (random() % 3) if (seed == 0)
{ {
clock_gettime (CLOCK_REALTIME, &tp);
seed = tp.tv_nsec;
}
switch (rand_r (&seed) % 3)
{
case 1: case 1:
align = get_random_alignment (); /* Get a random alignment value. Biased towards the smaller
* values up to 16384. Must be a power of 2. */
align = 1 << rand_r (&seed) % 15;
retval = aligned_alloc (align, size); retval = aligned_alloc (align, size);
aligned_alloc_count++; aligned_alloc_count++;
break; break;
@ -59,13 +60,13 @@ static void *get_random_alloc (size_t size)
retval = __libc_malloc (size); retval = __libc_malloc (size);
libc_malloc_count++; libc_malloc_count++;
break; break;
} }
return retval; return retval;
} }
void *
void * __random_malloc (size_t size) __random_malloc (size_t size)
{ {
return get_random_alloc (size); return get_random_alloc (size);
} }