45 lines
949 B
C
45 lines
949 B
C
#include <stdio.h>
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#include <stdlib.h>
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#include <pthread.h>
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#include <semaphore.h>
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long long counter = 0;
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long long niters;
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sem_t mutex;
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void *thread_func(void *arg) {
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for (long long i = 0; i < niters; i++) {
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sem_wait(&mutex);
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counter++;
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sem_post(&mutex);
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}
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return NULL;
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}
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int main(int argc, char *argv[]) {
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if (argc != 2) {
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fprintf(stderr, "Usage: %s <niters>\n", argv[0]);
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return 1;
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}
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niters = atoll(argv[1]);
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sem_init(&mutex, 0, 1);
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pthread_t t1, t2;
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pthread_create(&t1, NULL, thread_func, NULL);
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pthread_create(&t2, NULL, thread_func, NULL);
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pthread_join(t1, NULL);
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pthread_join(t2, NULL);
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sem_destroy(&mutex);
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printf("Expected: %lld, Got: %lld\n", 2 * niters, counter);
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if (counter == 2 * niters) {
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printf("SUCCESS: No race condition.\n");
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} else {
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printf("ERROR: Race condition detected!\n");
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}
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return 0;
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}
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