Set the errno as the error number that a pthread function returns #454
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The pthread library does not set the errno variable upon error. The
error code is returned by the function instead.
Without the patch, the following error message may occur:
"FATAL: Terminating the checkpoint thread failed. errno = 0 (Success)"
With the patch:
"FATAL: Terminating the checkpoint thread failed. errno = 3 (No such process)"