';
# process the form input
if ($form['submitted']) {
# wrong input
if (!isset($table[$form['date']][$form['time']][$form['computer']])) {
$error_message = 'Invalid time slot. Please correct it and submit again.
';
$error_message .= $form['date'].' '.$form['time'].' '.$form['computer'];
}
# missing name
elseif (!$form['name']) {
$error_message = 'You did not enter your name. Please enter it and submit again.
';
}
# used slot
elseif ($table[$form['date']] [$form['time']] [$form['computer']]) {
$error_message = 'That time slot is already taken. Please choose another one.
';
}
# everything's okay, let's add this to the table
else {
add_to_table($form['date'], $form['time'], $form['computer'], $form['name']);
# reload this page, to avoid re-submitting the form when clicking F5
header("Location: .");
exit;
}
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
?>
CS4706 - Sign-up page for the Linux computers in the Speech Lab
CS4706 - Sign-up page for the Linux computers in the Speech Lab
Instructions
- To reserve a computer, select the date, time and computer
of an empty slot, enter your name, and hit the SUBMIT button.
- Make a reservation only if you are sure that you will use it.
- WARNING: Reservations cannot be canceled
using this page. Please be careful! If you need to cancel a reservation, send an e-mail to one of the TAs with
the subject "CS4706 - Cancel reservation".
- Do not wait until the last minute to do this assignment. There will probably
be shortage of time slots on the days previous to the due date.
- Check the speechlab page
for a listing of lab monitors and any assistance on the day/time you come in.
- Please report bugs in this webpage by e-mail to Erica Cooper.
Note: The sound booth and its machine (Felix) will also be available to do recording. It can be shared among people working in the lab.
0) {
# append $MY_NUMBER to the lock file
$fh = fopen(LOCKFILE, 'a');
fwrite($fh, $MY_NUMBER."\n");
fclose($fh);
# now read the lock file
$lines = file(LOCKFILE);
$first_number = rtrim($lines[0]);
# it's our turn, succeeded!
if ($MY_NUMBER == $first_number) return;
# otherwise, let's wait 0.5 seconds and retry.
usleep(500000);
print $first_number;
# decrease the number of attempts
$attempts--;
}
# write (not append) $MY_NUMBER to the lock file
$fh = fopen(LOCKFILE, 'w');
fwrite($fh, $MY_NUMBER."\n");
fclose($fh);
}
# unlocks the table
function unlock_table() {
# empties the lock file.
$fh = fopen(LOCKFILE, 'w');
fwrite($fh, "");
fclose($fh);
}
# initializes the table with '' in all cells
function initialize_table(&$table) {
global $DATES, $TIMES, $COMPUTERS;
foreach ($DATES as $date) {
foreach ($TIMES as $time) {
foreach ($COMPUTERS as $computer) {
$table[$date][$time][$computer] = '';
}
}
}
}
# says whether $date should be shown or not
function show_this_date($date, $dow) {
global $show_all;
if ($show_all) return TRUE;
if ($dow > 4) return FALSE;
# only show dates between now and N weeks in the future.
if (strtotime("23:59 $date") < time()) return FALSE;
if (strtotime("00:00 $date") > time()+60*60*24*7*N_WEEKS) return FALSE;
return TRUE;
}
?>