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- /* 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 main()
- {
- pthread_t thread1, thread2; /* thread variables */
- thdata data1, data2; /* structs to be passed to threads */
- /* initialize data to pass to thread 1 */
- data1.thread_no = 1;
- strcpy(data1.message, "Hello!");
- /* initialize data to pass to thread 2 */
- data2.thread_no = 2;
- strcpy(data2.message, "Hi!");
- /* create threads 1 and 2 */
- pthread_create (&thread1, NULL, (void *) &print_message_function, (void *) &data1);
- pthread_create (&thread2, NULL, (void *) &print_message_function, (void *) &data2);
- /* Main block now waits for both threads to terminate, before it exits
- If main block exits, both threads exit, even if the threads have not
- finished their work */
- pthread_join(thread1, NULL);
- pthread_join(thread2, NULL);
- /* 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);
- pthread_exit(0); /* exit */
- } /* print_message_function ( void *ptr ) */
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