A process in the wait state.A process waits on a ring buffer or semaphore, unable to change state and resume execution until the ring buffer or semaphore has been signalled by another process.

• 处于等待状态的一个进程，该进程在一个环形缓冲区或信号灯处等待，直到另一个进程发出释放信号才能改变状态，恢复执行。