protected static function _initClockSeq()
{
$shmId = shm_attach(self::$_shmKey);
self::$_clockSeq = shm_get_var($shmId, self::$_clockSeqKey);
if (self::$_clockSeq === false) {
$semId = sem_get(self::$_semKey);
sem_acquire($semId);
//blocking
if (shm_has_var($shmId, self::$_clockSeqKey)) {
self::$_clockSeq = shm_get_var($shmId, self::$_clockSeqKey);
} else {
// 0x8000 variant (2 bits)
// clock sequence (14 bits)
self::$_clockSeq = 0x8000 | mt_rand(0, (1 << 14) - 1);
shm_put_var($shmId, self::$_clockSeqKey, self::$_clockSeq);
}
sem_release($semId);
}
shm_detach($shmId);
}
protected static function _initClockSeq()
{
if (isset(self::$_clockSeq)) {
// Already initialized
return;
}
$shmId = shm_attach(self::$_shmKey);
if (shm_has_var($shmId, self::$_clockSeqKey)) {
self::$_clockSeq = shm_get_var($shmId, self::$_clockSeqKey);
} else {
$semId = sem_get(self::$_semKey);
sem_acquire($semId);
// Start blocking
// 0x8000 variant (2 bits)
// clock sequence (14 bits)
self::$_clockSeq = 0x8000 | mt_rand(0, (1 << 14) - 1);
shm_put_var($shmId, self::$_clockSeqKey, self::$_clockSeq);
sem_release($semId);
// Stop blocking
}
shm_detach($shmId);
}
