Renaming folders

chp4_threads/ex426.c

@@ -0,0 +1,57 @@
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+typedef unsigned long long int bigint_t;
+
+void *fibonacci(void *);
+
+bigint_t *numbers;
+
+int main(int argc, char *argv[]) {
+  if (argc < 2) {
+    perror("USAGE: fibonacci NUMBER\n");
+    exit(EXIT_FAILURE);
+  }
+
+  const int n = atoi(argv[1]);
+  numbers = (bigint_t *)calloc(n, sizeof(bigint_t));
+
+  pthread_attr_t attr;
+  pthread_t thread;
+  pthread_attr_init(&attr);
+  pthread_create(&thread, &attr, fibonacci, (void *)&n);
+  pthread_join(thread, NULL);
+
+  printf("Fibonacci of %d:\n", n);
+  for (int i = 0; i < n; i++) {
+    printf("%llu ", numbers[i]);
+  }
+  printf("\n");
+
+  free(numbers);
+  numbers = NULL;
+
+  return EXIT_SUCCESS;
+}
+
+void *fibonacci(void *args) {
+  const int *n = (int *)args;
+  bigint_t first = 0, second = 1;
+
+  if (*n >= 1) {
+    numbers[0] = first;
+  }
+  if (*n >= 2) {
+    numbers[1] = second;
+  }
+
+  for (int i = 2; i < *n; i++) {
+    const bigint_t third = first + second;
+    first = second;
+    second = third;
+    numbers[i] = third;
+  }
+
+  pthread_exit(0);
+}