ibinder
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IBinder methods must , therefore , be implemented to be thread-safe .
因此IBinder方法必须实现为线程安全的。
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When a call on a method implemented in an IBinder originates in the same process in which the IBinder is running , the method is executed in the caller 's thread .
如果对IBinder所实现方法的调用发起于IBinder所在进程的内部,那么这个方法是执行在调用者的线程中的。