/*	alarm3.cpp
	an alarm example using multiple threads
*/
#include <pthread.h>
#include <wait.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

typedef struct alarm_tag {
	int seconds;
	char message[64];
} alarm_t;

void * alarm_thread( void * );

int main(int argc, char *argv[])
{
	char line[128];
	alarm_t *alarm;
	pthread_t thread;
	int status;

	while(1) {
		printf("Alarm>");
		if (fgets(line, sizeof (line), stdin) == NULL) exit(0);
		if (strlen (line) <=1) continue;
		alarm = (alarm_t *)malloc(sizeof(alarm_t));
		if ( alarm == NULL ) {
			printf("malloc error\n");
			exit(1);
		}

		/* parse input line into seconds (%d) and a message
		 * (%64[^\n]), consisting of up to 64 characters 
		 * separated from the seconds by whitespace.
		 */
		if (sscanf(line, "%d %64[^\n]",
		    &alarm->seconds, alarm->message ) <2 ) {
		    fprintf( stderr, "Bad Command\n");
		    free( alarm );
		}
		else {
		    status = pthread_create (
			&thread, NULL, alarm_thread, alarm );
		    if ( status !=0 ) {
 			printf("create alarm thread error!\n");
			exit(1);
		    }
		}
	}
}

void *alarm_thread(void *arg)
{
	alarm_t *alarm = (alarm_t *) arg;
	int status;
	
	status = pthread_detach(pthread_self());
	if (status != 0) {
		printf(" Detach thread error. \n");
		pthread_exit(NULL);
	}
	sleep( alarm->seconds);
	printf("(%d) %s\n", alarm->seconds, alarm->message);
  	free(alarm);
	return NULL;
}