The father son fork process can control the process? If the father's wish to kill off the process of sub-process or sub-process to send a signal to be? Apart from the multi-process and multi-threaded system costs compared different benefits and what is the difference? The first issue, fork, you can process elements of the process id The second issue discussed c version of the cattle, said the process sometimes better threads. . . . Not really understand, but not to utter easily engage Pid kill off the process of how to be son? 2 kill man. LZ is sending a signal to the meaning-signal? The amount of signal and the two concepts. Sons process can be achieved through shared memory available mutex semaphores --> Never understood what you said. --> Semaphore signals and is not the same, is used to transmit the signal can be sent to kill. Semaphores are used to achieve the mutually exclusive. OS synchronization process should be referred to the Lane [ Closed window ]