source:Industry News release time:2023-05-22 Article author:yu Popular:pcb
Each process must have a unique identifier, which can be a string or a number. In the Unix system is an integer number. The system is given by the system when the process is created. The process identifier is used to a unique identification of a process. One process usually has the following two identifies.
External identifier. Provided by the creator, it is usually composed of letters and numbers, and it is often used by users (processes) to access the process. The external identifier is easy to memory, such as calculation processes, printing processes, sending processes, receiving processes, etc.
Internal identifier: Set for the convenience of system use. In all OS, each process gives each process a unique integer as an internal identifier. It is usually a symbol of a process. In order to describe the family relationship of the process, the parent process identifier and the sub -process identifier should also be set. You can also set the user identifier to indicate which user has it.
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