--TEST--
Test sem_acquire with nowait option
--EXTENSIONS--
sysvsem
pcntl
--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.\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($p_sem_id)) {
    echo "P: fail to acquire semaphore.\n";
    sem_remove($p_sem_id);
    exit;
}
echo "P: acquired semaphore.\n";

// Acquire semaphore for child
if (!sem_acquire($c_sem_id)) {
    echo "P: failed to acquire semaphore.\n";
    sem_remove($c_sem_id);
    exit;
}
echo "P: acquired semaphore.\n";
// Fork process
$pid = pcntl_fork();

if ($pid) {

    register_shutdown_function(function () use ($p_sem_id) {
        echo "P: removing semaphore.\n";
        sem_remove($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.\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.\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 ($c_sem_id) {
        echo "C: removing semaphore.\n";
        sem_remove($c_sem_id);
    });

    echo "C: child process running.\n";

    // Have the semaphore after process forked
    echo "C: got semaphores.\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.\n";
        exit;
    }

    // The child process did not wait to acquire the semaphore
    echo "C: failed to acquire semaphore.\n";

    echo "C: releasing semaphore.\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.\n";
        exit;
    }
    echo "C: success acquired semaphore.\n";

    echo "C: releasing semaphore.\n";
    sem_release($p_sem_id);
}

?>
--EXPECT--
P: parent process running.
P: got semaphore.
P: acquired semaphore.
P: acquired semaphore.
C: child process running.
C: got semaphores.
C: failed to acquire semaphore.
C: releasing semaphore.
P: releasing semaphore.
C: success acquired semaphore.
C: releasing semaphore.
C: removing semaphore.
P: removing semaphore.