como mutex travar em c
pthread_mutex_t my_mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_lock(&my_mutex);
/* locked code */
pthread_mutex_unlock(&my_mutex);
Yehuda Levavi
pthread_mutex_t my_mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_lock(&my_mutex);
/* locked code */
pthread_mutex_unlock(&my_mutex);#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <unistd.h>
#ifndef NUM_THREADS
#define NUM_THREADS 4
#endif
int shared = 0;
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
void *func3(void* param)
{
pthread_mutex_lock(&mutex);
printf("Incrementing the shared variable...\n");
for (int i = 0; i < 10000; ++i) {
shared += 1;
}
pthread_mutex_unlock(&mutex);
return 0;
}
int main()
{
pthread_t threads[NUM_THREADS];
for (int i = 0; i < NUM_THREADS; ++i) {
pthread_create(&threads[i], NULL, func3, NULL);
}
for (int i = 0; i < NUM_THREADS; ++i) {
pthread_join(threads[i], NULL);
}
printf("%d\n", shared);
exit(EXIT_SUCCESS);
}