标签：des style http color java os io strong
事件可传信给其他线程，表示某些条件现在已具备，比如有可用的消息。
事件可分为手动复位和自动复位，前者可传信给许多同时等待事件的线程而且可以被复位。
自动复位的事件传信给单个等待时间的线程，该事件会自动复位。
Applications can use event objects in a number of situations to notify a waiting thread of the occurrence of an event. For example, overlapped I/O operations on files, named pipes, and communications devices use an event object to signal their completion.
The following example(From MSDN)uses event objects to prevent several threads from reading from a shared memory buffer while a master thread is writing to that buffer. First, the master thread uses the CreateEvent function to create a manual-reset event object whose initial state is nonsignaled. Then it creates several reader threads. The master thread performs a write operation and then sets the event object to the signaled state when it has finished writing.
Before starting a read operation, each reader thread uses WaitForSingleObject to wait for the manual-reset event object to be signaled. When WaitForSingleObject returns, this indicates that the main thread is ready for it to begin its read operation.
标签：des style http color java os io strong
原文地址：http://blog.csdn.net/chuchus/article/details/38567423
