信号是一个事件，它被用来向某个进程发出警报。

A signal is an event, and it's used to alert a process.

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内核或用户空间，通过执行某些系统事件发出信号。

The kernel or user space via some system event.

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要将某个事件的状态修改为有信号状态，可以使用semop，并将sem_op的值设置为1。

To signal an event, semop is used with sem_op value as 1.

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RowUpdated事件发出信号通知更新命令结束。

The completion of an update command is signaled by the RowUpdated event.

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对一个已经设置为有信号状态的事件对象再次执行该函数是无效的。

Setting an already-set event object has no effect .

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恰好在移除项目或项目项后发出此事件信号。

This event is signaled just after removing a Project or ProjectItem.

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恰好在移除项目或项目项后发出此事件信号。

This event is signaled just after removing a Project or ProjectItem.

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