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对于这种情况:进程B将等待进程A释放自旋,因此预先排好? Process A: -->spin lock --> do strict call --> before unlock time int
Time int ISR: --> Process A time slice finished --> need schedule -->ISR ret --> schedule to Process B
Process B: -->spin lock for same resource --> failed --> spin wait
为什么spin_lock应禁用抢占?如果不禁用抢先会发生什么?