PAL.C.T MINI SHELL
--TEST--
Test sem_acquire with nowait option
--SKIPIF--
<?php // vim600: ts=4 sw=4 syn=php fdm=marker
if(!extension_loaded('sysvsem') || !extension_loaded('pcntl')) {
die("skip sysvsem and pcntl required");
}
?>
--FILE--
<?php
$P_SEMKEY = ftok(__FILE__, 'P'); // Parent Semaphore key
$C_SEMKEY = ftok(__FILE__, 'C'); // Child Semaphore key
echo "P: parent process running.\n";
pcntl_signal(SIGCHLD, SIG_IGN);
// Get semaphore for parent
$p_sem_id = sem_get($P_SEMKEY, 1);
if ($p_sem_id === FALSE) {
echo "P: failed to parent get semaphore\n";
exit;
}
echo "P: got semaphore $p_sem_id.\n";
// Get semaphore for child
$c_sem_id = sem_get($C_SEMKEY, 1);
if ($c_sem_id === FALSE) {
echo "P: failed to child get semaphore\n";
exit;
}
// Acquire semaphore for parent
if (!sem_acquire($p_sem_id)) {
echo "P: fail to acquire semaphore $p_sem_id.\n";
sem_remove($p_sem_id);
exit;
}
echo "P: acquired semaphore $p_sem_id.\n";
// Acquire semaphore for child
if (!sem_acquire($c_sem_id)) {
echo "P: fail to acquire semaphore $c_sem_id.\n";
sem_remove($c_sem_id);
exit;
}
echo "P: acquired semaphore $c_sem_id\n";
// Fork process
$pid = pcntl_fork();
if ($pid) {
register_shutdown_function(function () use ($p_sem_id) {
echo "P: removing semaphore $p_sem_id.\n";
sem_remove($p_sem_id);
});
// Release semaphore after 50ms
usleep(50000);
/* Wait for the child semaphore to be released to
to release the parent semaphore */
if (!sem_acquire($c_sem_id)) {
echo "P: failed to acquire semaphore $c_sem_id.\n";
exit;
}
/* Release the child semahpore before releasing
the releasing the parent semaphore and letting
the child continue execution */
sem_release($c_sem_id);
echo "P: releasing semaphore $p_sem_id.\n";
if (!sem_release($p_sem_id)) {
echo "P: failed to release semaphore\n";
}
$status = null;
pcntl_waitpid($pid, $status);
} else {
register_shutdown_function(function () use ($c_sem_id) {
echo "C: removing semaphore $c_sem_id.\n";
sem_remove($c_sem_id);
});
echo "C: child process running.\n";
// Have the semaphore after process forked
echo "C: got semaphore $p_sem_id and $c_sem_id.\n";
// This should fail to get to the semaphore and not wait
if (sem_acquire($p_sem_id, true)) {
echo "C: test failed, Child was able to acquire semaphore $p_sem_id.\n";
exit;
}
// The child process did not wait to acquire the semaphore
echo "C: failed to acquire semaphore $p_sem_id.\n";
echo "C: releasing semaphore $c_sem_id\n";
if (!sem_release($c_sem_id)) {
echo "C: Failed to release semaphore\n";
}
// Acquire semaphore with waiting
if (!sem_acquire($p_sem_id)) {
echo "C: fail to acquire semaphore $p_sem_id.\n";
exit;
}
echo "C: success acquired semaphore $p_sem_id.\n";
echo "C: releasing semaphore $p_sem_id.\n";
sem_release($p_sem_id);
}
?>
--EXPECTF--
P: parent process running.
P: got semaphore Resource id #%i.
P: acquired semaphore Resource id #%i.
P: acquired semaphore Resource id #%i
C: child process running.
C: got semaphore Resource id #%i and Resource id #%i.
C: failed to acquire semaphore Resource id #%i.
C: releasing semaphore Resource id #%i
P: releasing semaphore Resource id #%i.
C: success acquired semaphore Resource id #%i.
C: releasing semaphore Resource id #%i.
C: removing semaphore Resource id #%i.
P: removing semaphore Resource id #%i.
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