35 lines
599 B
C
35 lines
599 B
C
|
/* mutex-example-1.c */
|
||
|
|
|
||
|
|
#include <pthread.h>
|
||
|
|
#include <inttypes.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
|
||
|
|
pthread_mutex_t m;
|
||
|
|
pthread_t t1, t2;
|
||
|
|
uint64_t value = 0;
|
||
|
|
|
||
|
|
void* my_thread(void *_)
|
||
|
|
{
|
||
|
|
for (int n = 0; n < 1000000; n++)
|
||
|
|
{
|
||
|
|
pthread_mutex_lock(&m);
|
||
|
|
value += 1;
|
||
|
|
pthread_mutex_unlock(&m);
|
||
|
|
}
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(void)
|
||
|
|
{
|
||
|
|
pthread_mutex_init(&m, NULL);
|
||
|
|
pthread_create(&t1, NULL, my_thread, NULL);
|
||
|
|
pthread_create(&t2, NULL, my_thread, NULL);
|
||
|
|
pthread_join(t1, NULL);
|
||
|
|
pthread_join(t2, NULL);
|
||
|
|
printf("%"PRIu64"\n", value);
|
||
|
|
pthread_mutex_destroy(&m);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|