aiwork

AI-work/task62.c

@@ -0,0 +1,46 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <pthread.h>
+#include <semaphore.h>
+
+volatile long long counter = 0;
+long long niters;
+sem_t mutex;
+
+void *thread_func(void *arg)
+{
+    for (long long i = 0; i < niters; i++) {
+        sem_wait(&mutex);
+        counter++;
+        sem_post(&mutex);
+    }
+    return NULL;
+}
+
+int main(int argc, char *argv[])
+{
+    if (argc != 2) {
+        fprintf(stderr, "Usage: %s <niters>\n", argv[0]);
+        return 1;
+    }
+    niters = atoll(argv[1]);
+
+    sem_init(&mutex, 0, 1);
+
+    pthread_t t1, t2;
+    pthread_create(&t1, NULL, thread_func, NULL);
+    pthread_create(&t2, NULL, thread_func, NULL);
+
+    pthread_join(t1, NULL);
+    pthread_join(t2, NULL);
+
+    printf("Expected: %lld, Got: %lld\n", 2 * niters, counter);
+    if (counter != 2 * niters) {
+        printf("ERROR: Race condition detected!\n");
+    } else {
+        printf("Correct! No race condition.\n");
+    }
+
+    sem_destroy(&mutex);
+    return 0;
+}