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Why PHP has separate version of ts(thread safe)/nts(non thread safe) while it doesn't support multi-threading?

I think the title is clear.

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yoyo Avatar asked Oct 21 '10 02:10

yoyo


1 Answers

While you can't spawn threads from PHP code you can use PHP with a multi-threaded web server that handles concurrent requests on different threads. In this case the TS (thread-safe) version of PHP should be used.

The TS version of PHP keeps the state of each request in its own memory location. This is necessary because all requests in a multi-threaded server share the same address space.

The alternative is to use a multi-process (usually prefork) server. With such a server some state can be kept in global variables without affecting concurrent requests. That's how the NTS (non thread-safe) version of PHP is implemented.

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12 revs Avatar answered Sep 17 '22 15:09

12 revs