[Javascript] A js mutex lock! hiahia~

/** * Description : * Simulation of mutex lock, it works while little access only. * * History: * 1. 2005/09/07 create by Moky <[e-mail]> * 2. 2006/05/23 modified by Moky <[e-mail]> */if (typeof g_mutex_lock == "undefined"){g_mutex_lock = new Array();}function mutex_check_init(){if (!g_mutex_lock)return -1;if (!g_mutex_lock.constructor)return -1;if (g_mutex_lock.constructor.toString().toLowerCase().indexOf("array") == -1)return -1;return 0;}function mutex_lock(name){var max_sig = 1;if (mutex_check_init() < 0)return -1;if (!g_mutex_lock[name])g_mutex_lock[name] = 0;/* try lock */g_mutex_lock[name]++;if (g_mutex_lock[name] > max_sig){/* lock failed, roll back */g_mutex_lock[name]--;return -1;}return 0;}function mutex_unlock(name){if (mutex_check_init() < 0)return -1;if (g_mutex_lock[name] <= 0)return -1;g_mutex_lock[name]--;return 0;}