python 僵尸进程&孤儿进程

僵尸进程&孤儿进程
On Unix and Unix-like computer operating systems, a zombie process or defunct process is a process that has completed execution (via the exit system call) but still has an entry in the process table: it is a process in the “Terminated state”. This occurs for child processes, where the entry is still needed to allow the parent process to read its child’s exit status: once the exit status is read via the wait system call, the zombie’s entry is removed from the process table and it is said to be “reaped”. A child process always first becomes a zombie before being removed from the resource table. In most cases, under normal system operation zombies are immediately waited on by their parent and then reaped by the system – processes that stay zombies for a long time are generally an error and cause a resource leak.
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