.goutputstream-BIDHFZ

#include <stdlib.h>
#include "message.h"
#include <mqueue.h>
#include <string.h>
#include <pthread.h>
#include <fcntl.h> /* flags */
#include <sys/stat.h> /* modes */
#include <stdio.h>


//sudo sh -c 'echo 512 > /proc/sys/fs/mqueue/msg_max'

// gcc -g -Wall -pthread -o server server.c -lrt

/*
 * cc -c first.c

that would produce an object file you may need to add to the library.

then create an executable using the following command

cc -o first first.c
 * */

// gcc -g -Wall -pthread -o server server.c -lrt

//globals:
/* mutex and condition variables for the message copy */
pthread_mutex_t mutex_msg;
int msg_not_copied = 1; /* TRUE = 1 */
pthread_cond_t cond_msg;

//thread function 
void process_message(struct request *msg){
	
	printf("process_message() \n");
 struct request *msg_local =  malloc(sizeof( *msg_local));; /* local message */
 
 mqd_t q_client; /* client queue */
int  result = 1;

//*result = 1;
/* thread copies message to local message*/
pthread_mutex_lock(&mutex_msg);
//memcpy((char *) &msg_local, (char *)&msg, sizeof( *msg) );
msg_local = msg;
/* wake up server */
msg_not_copied = 0; /* FALSE = 0 */
pthread_cond_signal(&cond_msg); 
pthread_mutex_unlock(&mutex_msg);


printf("Alternate thread message: %s \n", msg_local->str);
q_client = mq_open(msg_local->str, O_WRONLY);
if (q_client == -1){

	printf("%s \n", msg_local->str);
	

perror("Can’t open client queue");

}
else {

mq_send(q_client, (char *) &result, sizeof(result), 0);
printf("\n Response sent \n");
mq_close(q_client);
printf("client queue closed \n");
}


pthread_exit(0);
//return; ->** this gives "stack smashing error"
}






int main(void)
{
	
mqd_t q_server; /* server queue */
 struct request *msg = (struct request *) malloc(sizeof( *msg)); /* message to receive */
 //msg->flt = (float * ) malloc(sizeof( float));
 //msg->key = (int * ) malloc(sizeof( int));
struct mq_attr q_attr; /* queue atributes */
pthread_attr_t t_attr; /* thread atributes */


q_attr.mq_maxmsg = 20;
q_attr.mq_msgsize = sizeof(  *msg);
pthread_t thid; //need reference to thread



//**if error: 
//then sudo sh -c 'echo 512 > /proc/sys/fs/mqueue/msg_max'
q_server = mq_open("/server",  O_RDONLY | O_CREAT, 0777 , &q_attr);

if (q_server == -1) {
	//***
	printf("server ");
	
perror("Can't create server queue");
return 1;
}

pthread_mutex_init(&mutex_msg, NULL);
pthread_cond_init(&cond_msg, NULL);

pthread_attr_setdetachstate(&t_attr, PTHREAD_CREATE_DETACHED);
pthread_attr_init(&t_attr);





//msg = malloc(sizeof(struct request));

while (1) {
	
	
	
	printf("waiting for message \n");

ssize_t ret = mq_receive(q_server, (char *)msg, sizeof( *msg), 0); 
printf("Recieved! \n");


printf("Main thread Message: %s \n", msg->str);
if(ret==-1){
	printf("MESSAGE SIZE: %ld",sizeof(&msg));
	
	perror("ERR:");

	}
pthread_create(&thid, &t_attr, (void *)process_message, msg);
//pthread_join(thid,NULL);




//msg_not_cpied first init to true. set to 0 in process message(), after message is succesfully copied.

/* wait for thread to copy message */

pthread_mutex_lock(&mutex_msg);

//work out message not copied stuff they are all off
while (msg_not_copied){
printf("copying message \n");
 pthread_cond_wait(&cond_msg, &mutex_msg);
 printf("after con wait \n");
msg_not_copied = 0;

pthread_mutex_unlock(&mutex_msg);
 printf("pthread_mutex_unlock(&mutex_msg); \n");

}

printf("**** WILL NOW WAIT FOR NEXT MESSAGE \n");
}

}//Main done 

//** most current**** stuck on only being able to send 2 messages.