30-2 ucos-ii信号量.rar
ucos 信号量，邮箱，怎么理解？ 信号量好比代号 ，只由当主任务发送信号量后 分任务正好有请求信号量---才继续执行分任务请求信号量函数后面的功能；如果分任务有请求信号量函数，但是主任务中没有发送，分任务还是不能执行的。好比老师提问问题 叫 “老王” 来回答一个问题， 老王 竖起耳朵在听 听到了 老师喊他， 老王才开始给老师回答问题，回答完后就停止回答了；只有老师在喊老王，老王生气了(也就是任务中没有请求函数) 是不会甩老师的。老王还是很有脾气的。
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