[5.5] Fix release of unexpected mutex #23607
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Fix to not mistakenly release mutex when pcntl_fork function is used.
The Laravel console has multiple start prevention function by mutex.
However, since register_shutdown_function is used, if you write processing that uses process fork, the locking mechanism will be released in the child process.
When creating a mutex, keeping the parent process ID and checking it when calling removeMutex prevents operation in the child process.