Remove the mutex, just fork and threads

tests/pthread/thread_fork.c

@@ -1,4 +1,4 @@
-/// test mutex inside fork
+/// test fork inside thread
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -11,33 +11,22 @@
 #define NUM_THREADS 4
 #define ITERATIONS 3
 
-pthread_mutex_t global_lock;
 
 void* thread_func(void* arg) {
     long tid = (long)arg;
 
     for (int i = 0; i < ITERATIONS; i++) {
-        printf("thread %ld loop %i lock\n", tid, i);
-        
-        pthread_mutex_lock(&global_lock);
-        
-        pid_t pid = fork();
+        printf("thread %ld loop %i\n", tid, i);
 
-        if (pid < 0) {
-            perror("Fork failed");
-            pthread_mutex_unlock(&global_lock);
-            pthread_exit(NULL);
-        }
+        pid_t pid = fork();
+        ERROR_IF(fork, pid, < 0);
 
         if (pid == 0) {
             _exit(0);
         } else {
-            printf("thread %ld unlock\n", tid);
-            pthread_mutex_unlock(&global_lock);
-
             waitpid(pid, NULL, 0);
         }
-        
+
         usleep(1000); 
     }
 
@@ -47,17 +36,16 @@ void* thread_func(void* arg) {
 int main() {
     pthread_t threads[NUM_THREADS];
     int status;
-    pthread_mutex_init(&global_lock, NULL);
 
     for (long i = 0; i < NUM_THREADS; i++) {
         status = pthread_create(&threads[i], NULL, thread_func, (void*)i);
         ERROR_IF(pthread_create, status, != 0);
     }
 
+    printf("joining threads\n");
     for (int i = 0; i < NUM_THREADS; i++) {
         pthread_join(threads[i], NULL);
     }
 
-    pthread_mutex_destroy(&global_lock);
     return 0;
 }