/******************************************************
Tries to execute the job and then wait for it
to finish running.
POST: Returns true if the job was successfully started
and finished running. Returns false if there
was an error.
*/
void PipeManager::execute() {
// create arrays to pass to pipe system call
createPipes();
// create last child first
if (!createLastChild())
return;
// create all middle children in reverse order
int num_middle_children = my_command.getCommands().size() - 2; // - 2 because we're doing first and last separately
for (int childCtr = num_middle_children; childCtr > 0; childCtr--) {
if (!createMiddleChild(childCtr))
return;
}
if (!createFirstChild())
return;
// must be in parent now, close pipes and wait for children
closePipes();
waitForChildren();
deletePipes();
return;
}
int main(int argc, char** argv)
{
int num = 6;
pid_t childPids[num];
int* pipes[num];
createPipes(num, pipes);
forkManyProc(num, childPids);
waitForChildren(num);
return 0;
}
void parentProcess( Process* const proc ) {
closeUnusedPipes( proc );
// Receive STARTED
receiveAll( proc, STARTED, proc -> total );
sprintf( LogBuf, log_received_all_started_fmt, get_lamport_time(), proc -> localId );
makeIPCLog( LogBuf );
// Receive DONE
receiveAll( proc, DONE, proc -> total );
sprintf( LogBuf, log_received_all_done_fmt, get_lamport_time(), proc -> localId );
makeIPCLog( LogBuf );
waitForChildren();
closeTheOtherPipes( proc );
}
/*
Initialize the program
Starts ncurses and draws the initial screen
Creates all the pipes
Forks all the children
*/
int main()
{
initCurses();
drawScreen();
setupSigs();
screenHeight = getHeight();
screenWidth = getWidth();
int i;
copper = (gvpipe_t *) calloc (NUM_PIPE, sizeof(gvpipe_t));
seedDroneRand();
Drone drone = createDrone(screenWidth, screenHeight);
int giveDrone = findQuad(drone.locX, drone.locY);
//creating all pipes
for (i = 0; i < NUM_PIPE; i++)
pipe (copper[i]);
//create children
for (i = 0; i < NUM_CHILD; i++) {
pids[i] = fork ();
if (pids[i] == 0) {
if(i == giveDrone)
begin(i, copper, NUM_CHILD, NUM_PIPE, drone, 1, screenHeight, screenWidth);
else
begin(i, copper, NUM_CHILD, NUM_PIPE, drone, 0, screenHeight, screenWidth);
exit (0);
}
}
waitForChildren();
free(copper);
return;
}
