Try to acquire a named lock and report the outcome.
function system_test_lock_acquire() {
if (lock()
->acquire('system_test_lock_acquire')) {
lock()
->release('system_test_lock_acquire');
return 'TRUE: Lock successfully acquired in system_test_lock_acquire()';
}
else {
return 'FALSE: Lock not acquired in system_test_lock_acquire()';
}
}