/*
* pit_irq_handler
* DESCRIPTION: Handles scheduling/context switching and setup of PIT
called from the handler from irq.c
* INPUTS: none
* OUTPUTS: None
* RETURN VALUE: none
* SIDE EFFECTS: schedules current processes running using round robin
*/
void pit_irq_handler(){
schedule_handler();
// printf("PIT %d\n",counter);
}
int schedule_main(void)
/****************************************************************/
{
//Variables
int i, j;
//
int fd_max;
fd_set reads, temps;
struct timeval tv;
//
int server_socket;
int client_socket;
struct sockaddr_in server_addr;
struct sockaddr_in client_addr;
//
int fd;
int sin_size;
int server_port;
int status;
//Initialize
i = j = 0;
//
fd_max = 0;
FD_ZERO(&reads);
FD_ZERO(&temps);
tv.tv_sec = 0;
tv.tv_usec = 10000; //0.01sec
//
server_socket = 0;
client_socket = 0;
memset(&server_addr, 0, sizeof(server_addr));
memset(&client_addr, 0, sizeof(client_addr));
//
fd = 0;
sin_size = sizeof(client_addr);
server_port = SCHED_SERVER_PORT;
status = INIT_PROCESS;
//Ignore broken_pipe signal
signal(SIGPIPE, SIG_IGN);
IfaceGhpSchedSelectSleep(3,0);
while(1)
{
IfaceGhpSchedSelectSleep(0,500);
switch(status)
{
case INIT_PROCESS:
{
server_socket = socket(PF_INET, SOCK_STREAM, 0);
printf("Schedule-Server Started, Port [%d]\n", server_port);
//
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
server_addr.sin_port = htons(server_port);
//
setsockopt(server_socket, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
//
if(bind(server_socket, (struct sockaddr *)&server_addr,
sizeof(server_addr)) < 0)
{
printf("[ERROR] In Bind of Schedule-Server\n");
close(server_socket);
status = INIT_PROCESS;
//sleep(10);
IfaceGhpSchedSelectSleep(10,0);
break;
}
//
if(listen(server_socket, 10) < 0)
{
printf("[ERROR] In Listen of Schedule-Server\n");
close(server_socket);
status = INIT_PROCESS;
//sleep(10);
IfaceGhpSchedSelectSleep(10,0);
break;
}
//
FD_ZERO(&reads);
FD_SET(server_socket, &reads);
fd_max = server_socket;
//
status = SELECT_PROCESS;
break;
}
//
case SELECT_PROCESS:
{
//
temps = reads;
//
if(select(fd_max+1, &temps, 0, 0, &tv) == -1)
{
printf("[ERROR] In Select of Schedule-Server\n");
status = INIT_PROCESS;
//sleep(10);
IfaceGhpSchedSelectSleep(10,0);
break;
}
//
status = SELECT_PROCESS;
//
for(fd = 0; fd < (fd_max + 1); fd++)
{
if(FD_ISSET(fd, &temps))
{
//if connection's been requested,
if(fd == server_socket)
{
status = CONNECTION_REQUESTED;
break;
}
else
{
status = HANDLE_COMMAND;
break;
}
}
}
break;
}
//
case CONNECTION_REQUESTED:
{
client_socket = accept(server_socket, (struct sockaddr *)&client_addr,
&sin_size);
//
if (client_socket == -1)
{
printf("[Error] In Accept of Schedule-Server\n");
status = SELECT_PROCESS;
break;
}
//
FD_SET(client_socket, &reads);
if(fd_max < client_socket)
fd_max = client_socket;
//
status = SELECT_PROCESS;
break;
}
//
case HANDLE_COMMAND:
{
schedule_handler(fd, &reads);
status = SELECT_PROCESS;
break;
}
}
}
//
//return;
}
