assignment 2

Assignment2/Assignment2.c

@@ -0,0 +1,67 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <pthread.h> /*For working of POSIX thread*/
+#include <unistd.h> /* For pause() and sleep() */
+#include <errno.h> /*For using Global variable errno*/
+
+void*
+thread_fn_callback(void* arg) {
+	
+	return arg;
+
+}
+
+
+
+void
+create_thread(pthread_t* p, int arg) {
+
+	int* value = (int*)malloc(sizeof(int));
+
+	*value = arg;
+
+	pthread_attr_t attr;
+
+	pthread_attr_init(&attr);
+
+	pthread_attr_setdetachstate(&attr,
+		PTHREAD_CREATE_JOINABLE);
+
+	pthread_create(p,
+		&attr,
+		thread_fn_callback,
+		(void*)value);
+}
+
+int
+main(int argv, char* argc[]) {
+	
+	int n;
+	printf("Enter the number of threads:");
+	scanf("%d", &n);
+
+	pthread_t* threads;
+	threads = (pthread_t *)calloc(n, sizeof(pthread_t));
+
+	int val;
+
+	for (int i = 0; i < n; i++) {
+
+		val = i+1;
+		create_thread(&threads[i], val);
+	}
+
+	void* thread_result = NULL;
+	for (int i = n - 1; i >= 0; i--) {
+		pthread_join(threads[i], &thread_result);
+
+		printf("%d\n", *(int*)thread_result);
+
+		if( thread_result != NULL)
+		free(thread_result);
+		thread_result = NULL;
+	}
+
+	free(threads);
+	return 0;
+}