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hide/atomic.c

Created August 20, 2019 06:56
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Atomic sample (gcc -std=gnu11 -pthread -o atomic atomic.c)
Raw
atomic.c
#include <stdio.h>
#include <string.h>
#include <stdatomic.h>
#include <pthread.h>
#include <stdint.h>
#define __STDC_FORMAT_MACROS
#include <inttypes.h>
struct object
{
_Atomic uint64_t aval;
uint64_t val;
} obj;
void *
cnt_add (void *arg)
{
int i;
for (i = 0; i < 10000; i++)
{
obj.aval++;
obj.val++;
}
pthread_exit (NULL);
}
int
main (int argc, char **argv)
{
int i;
pthread_t tid[1000];
memset (&obj, 0, sizeof (struct object));
for (i = 0; i < 1000; i++)
pthread_create (&tid[i], NULL, cnt_add, NULL);
for (i = 0; i < 1000; i++)
pthread_join (tid[i], NULL);
printf ("obj.aval = %" PRIu64 "\n", obj.aval);
printf ("obj.val = %" PRIu64 "\n", obj.val);
return 0;
}
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