可用于 Unity JobQueue 的当前工作线程数目。
默认情况下，此属性采用 JobWorkerMaximumCount 的值。可在运行时设置此属性的值，以便动态减小可用于 Unity 作业队列的工作线程数。这有节能效果，或者减少共享或虚拟机上的 CPU 负载。如果有作为服务器运行的游戏的多个实例，需要防止任何实例独占机器资源，这将很有用。
此值不能设置为低于 1 或高于 JobWorkerMaximumCount 属性的值。尝试这样做将抛出"超出范围"异常。
在某些平台上（例如Android），Unity 将在运行时自动调整该值以响应操作系统，从而指示可用内核数已更改。如果设备已进入或退出省电模式，可能发生这种情况。但如果将该属性手动设置为任何有效值，Unity 将停止任何自动调整（因此忽略来自操作系统的任何请求）。可通过调用 ResetJobWorkerCount 恢复自动调整模式。
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