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/* $OpenBSD: malloc_duel.c,v 1.3 2019/05/15 18:53:03 otto Exp $ */
/* PUBLIC DOMAIN Nov 2002 <marc@snafu.org> */
/*
* Dueling malloc in different threads
*/
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include "test.h"
volatile sig_atomic_t done;
#define MALLOC_COUNT 1024
/*
* sigalrm handler. Initiate end-of-test
*/
static void
alarm_handler(int sig)
{
done = 1;
}
/*
* A function that does lots of mallocs, called by all threads.
*/
static void
malloc_loop(void)
{
int i;
int **a;
a = calloc(MALLOC_COUNT, sizeof(int*));
ASSERT(a != NULL);
while (!done) {
for (i = 0; i < MALLOC_COUNT; i++) {
a[i] = malloc(sizeof(int));
ASSERT(a[i] != NULL);
}
for (i = 0; i < MALLOC_COUNT; i++) {
free(a[i]);
}
}
}
/*
* A thread that does a lot of mallocs
*/
static void *
thread(void *arg)
{
malloc_loop();
return NULL;
}
#define NCHILDS 10
int
main(int argc, char **argv)
{
pthread_t child[NCHILDS];
int i;
for (i = 0; i < NCHILDS; i++)
CHECKr(pthread_create(&child[i], NULL, thread, NULL));
ASSERT(signal(SIGALRM, alarm_handler) != SIG_ERR);
CHECKe(alarm(20));
malloc_loop();
for (i = 0; i < NCHILDS; i++)
CHECKr(pthread_join(child[i], NULL));
SUCCEED;
}
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