pcntl_getcpuaffinity

(PHP 8 >= 8.4.0)

pcntl_getcpuaffinity — Get the cpu affinity of a process

Description

pcntl_getcpuaffinity(?int $pid = null): bool|array

Retrieve the cpu affinity of the pid.

Parameters

pid: If null, the current process ID is used.

Return Values

Returns the cpu affinity mask of the process, or false on failure.

Warning

This function may return Boolean false, but may also return a non-Boolean value which evaluates to false. Please read the section on Booleans for more information. Use the === operator for testing the return value of this function.

Errors/Exceptions

A ValueError is thrown when pid is an invalid process id or the cpu mask had failed to be created.

If pid is a process for which the current user has no allowed permission, a E_WARNING is emitted.

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