int main(void) {
if(init_kernel() != OK)
{
/* Memory allocation problems */
while(1);
}
if(create_task( car_movement, 3000 ) != OK )
{
/* Memory allocation problems */
while(1);
}
if (create_task(cruisecontrol, 3500 ) != OK )
{
/* Memory allocation problems */
while(1);
}
if ((mbi=create_mailbox(1,sizeof(int))) == NULL) {
/* Memory allocation problems */
while (1);
}
if ((mbf=create_mailbox(1,sizeof(double))) == NULL) {
/* Memory allocation problems */
while (1);
}
run();
return 0;
}
/*
* Copy the specified messages to another mailbox.
*/
int
request_copy(const char *server, const char *port, const char *user,
const char *mesg, const char *mbox)
{
int t, r;
session *s;
const char *m;
if (!(s = session_find(server, port, user)))
return -1;
m = apply_namespace(mbox, s->ns.prefix, s->ns.delim);
do {
t = imap_copy(s, mesg, m);
switch (r = response_generic(s, t)) {
case STATUS_RESPONSE_TRYCREATE:
if (create_mailbox(s, mbox) == -1)
goto fail;
break;
case -1:
goto fail;
break;
}
} while (r == STATUS_RESPONSE_TRYCREATE);
return r;
fail:
close_connection(s);
session_destroy(s);
return -1;
}
/**
* send message to given destination
*/
asmlinkage long sys_SendMsg(pid_t dest, void *a_msg, int len, bool block){
pid_t my_pid = current->pid;
void* msg = new_msg();
message* this_mail;
mailbox* dest_mailbox;
signal* dest_signal;
struct task_struct* dest_ts;
int existence;
if ((len > MAX_MSG_SIZE) || (len < 0))
return MSG_LENGTH_ERROR;
if (copy_from_user(msg, a_msg, len))
return MSG_ARG_ERROR;
//check if destination is valid
if (dest <= 0) return MAILBOX_INVALID;
//find task struct for destination pid
dest_ts = pid_task(find_vpid(dest), PIDTYPE_PID);
// find_task_by_vpid(dest);
if (dest_ts == NULL) return MAILBOX_INVALID;
//state not 0 or kernel task, invalid dest
existence = dest_ts->state;
if ((existence != 0) || (dest_ts->mm == NULL)) return MAILBOX_INVALID;
//get destination mailbox
dest_signal = get_signal(dest);
if (dest_signal == NULL) {
dest_signal = create_signal(dest, TRUE);
}
dest_mailbox = get_mailbox(dest);
if (dest_mailbox == NULL) {
dest_mailbox = create_mailbox(dest);
if (dest_mailbox == NULL) return MAILBOX_ERROR;
}
wake_up(&(dest_signal->wait_null));
if ((block == TRUE) && (dest_mailbox->full == TRUE)){
//wait until not full and send message
}
else if (block == FALSE && (dest_mailbox->full == TRUE))
return MAILBOX_FULL; if (dest_mailbox->stop)
return MAILBOX_STOPPED;
this_mail = create_message(my_pid, len, msg);
spin_lock(&(dest_mailbox->lock));
add_message(&dest_mailbox, &this_mail);
spin_unlock(&(dest_mailbox->lock));
//successfully sent
return 0;
}
/*
* Append supplied message to the specified mailbox.
*/
int
request_append(const char *server, const char *port, const char *user,
const char *mbox, const char *mesg, size_t mesglen, const char *flags,
const char *date)
{
int t, r;
session *s;
const char *m;
if (!(s = session_find(server, port, user)))
return -1;
m = apply_namespace(mbox, s->ns.prefix, s->ns.delim);
do {
if ((t = imap_append(s, m, flags, date, mesglen)) == -1)
goto fail;
if ((r = response_continuation(s)) == -1)
goto fail;
switch (r) {
case STATUS_RESPONSE_CONTINUE:
if (imap_continuation(s, mesg, mesglen) == -1)
goto fail;
if ((r = response_generic(s, t)) == -1)
goto fail;
break;
case STATUS_RESPONSE_TRYCREATE:
if (create_mailbox(s, mbox) == -1)
goto fail;
break;
case -1:
goto fail;
break;
}
} while (r == STATUS_RESPONSE_TRYCREATE);
return r;
fail:
close_connection(s);
session_destroy(s);
return -1;
}
