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QuoteThe fork() emulation is implemented at the level of the Perl interpreter. What this means in general is that running fork() will actually clone the running interpreter and all its state, and run the cloned interpreter in a separate thread, beginning execution in the new thread just after the point where the fork() was called in the parent. We will refer to the thread that implements this child ``process'' as the pseudo-process.
To the Perl program that called fork(), all this is designed to be transparent. The parent returns from the fork() with a pseudo-process ID that can be subsequently used in any process manipulation functions; the child returns from the fork() with a value of 0 to signify that it is the child pseudo-process.
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