May 29, 2017 13:17 · May 29, 2017
diff --git a/pthread_ex b/pthread_ex
@@ -0,0 +1,55 @@
+/* Includes */
+#include <unistd.h>     /* Symbolic Constants */
+#include <sys/types.h>  /* Primitive System Data Types */ 
+#include <errno.h>      /* Errors */
+#include <stdio.h>      /* Input/Output */
+#include <stdlib.h>     /* General Utilities */
+#include <pthread.h>    /* POSIX Threads */
+#include <string.h>     /* String handling */
+
+/* prototype for thread routine */
+void print_message_function ( void *ptr );
+
+/* struct to hold data to be passed to a thread
+   this shows how multiple data items can be passed to a thread */
+typedef struct str_thdata
+{
+    int thread_no;
+    char message[100];
+} thdata;
+
+int global_val = 0;
+
+int main()
+{
+    pthread_t thread1;  /* thread variables */
+    thdata data1;         /* structs to be passed to threads */
+
+    /* initialize data to pass to thread 1 */
+    data1.thread_no = 1;
+    strcpy(data1.message, "Hello!");
+
+    pthread_create (&thread1, NULL, (void *) &print_message_function, (void *) &data1);
+
+    while(global_val != 1)
+    {
+    } 
+    printf("end\n");
+    /* exit */  
+    exit(0);
+} /* main() */
+
+/**
+ * print_message_function is used as the start routine for the threads used
+ * it accepts a void pointer 
+**/
+void print_message_function ( void *ptr )
+{
+    thdata *data;            
+    data = (thdata *) ptr;  /* type cast to a pointer to thdata */
+
+    /* do the work */
+    printf("Thread %d says %s \n", data->thread_no, data->message);
+    global_val = 1;
+    while(1);   
+} /* print_message_function ( void *ptr ) */
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