Übung2

Merged cars.c from my branch to Übung 2 branch

cars_1.c

+//Code compiles but without protection
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <pthread.h>
+#include <unistd.h>
+#include <sys/wait.h>
+
+#define crosses 100
+int car_on_bridge = 0;
+
+void* func(void* arg){
+    int car_id = *(int*)arg;
+    int crosses_counter = 0;
+    while (crosses_counter < crosses){
+        while (car_on_bridge == 1){
+        }
+    printf("Car %d is crossing the bridge\n",car_id);
+    car_on_bridge ++;
+    usleep(10000);
+    car_on_bridge --;
+    printf("Car %d is crossing the bridge\n", car_id);
+
+    crosses_counter++;
+    }
+    return NULL;
+}
+
+int main(){
+    pthread_t threads[2];
+    int thread_id[2] = {0,1};
+
+    for (int i = 0; i < 2; i++){
+        if (pthread_create(&threads[i],NULL,func,&thread_id[i])!=0){
+            printf("Error creating thread");
+            exit(1);
+        }
+    }
+    for (int i = 0; i < 2; i++){
+        if (pthread_join(threads[i],NULL)!=0){
+            printf("Error joining threads");
+            exit(1);
+        }
+    }
+    printf("All cars have crossed %d times!",crosses);
+    return 0;
+
+}
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