Refactoring in chapters

threads_chp4/ex424.c

@@ -0,0 +1,56 @@
+#define _GNU_SOURCE
+#include <pthread.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+bool prime(int n);
+void *primes(void *);
+
+const int thread_err = 1;
+
+int main(int argc, char *argv[]) {
+  if (argc < 2) {
+    perror("Usage: prime NUMBER\n");
+    exit(EXIT_SUCCESS);
+  }
+
+  const int n = atoi(argv[1]);
+
+  pthread_attr_t attr;
+  pthread_t thread;
+  pthread_attr_init(&attr);
+  pthread_create(&thread, &attr, primes, (void *)&n);
+  pthread_join(thread, NULL);
+
+  return EXIT_SUCCESS;
+}
+
+void *primes(void *args) {
+  printf("Thread %d calculate primes number\n", gettid());
+  const int *n = (int *)args;
+
+  if (*n <= 1) {
+    perror("Is not possible calculate prime numbers for number less or equal "
+           "than 1\n");
+    pthread_exit((void *)&thread_err);
+  }
+
+  for (int i = 2; i <= *n; i++) {
+    if (prime(i)) {
+      printf("%d ", i);
+    }
+  }
+  printf("\n");
+  pthread_exit(0);
+}
+
+bool prime(int n) {
+  for (int i = 2; i < n; i++) {
+    if (n % i == 0) {
+      return false;
+    }
+  }
+  return true;
+}