[Bug libc/6612] New: strftime() calls tzset() unnecessarily

[pasky at suse dot cz]

strftime() calls tzset() unnecessarily even if no timezone information is
required. Since tzset() involves at least single stat('/etc/localtime') syscall,
that can be significant overhead for applications that call strftime() very
frequently (e.g. gbookmark GLib component, see
http://bugzilla.gnome.org/show_bug.cgi?id=535223#c4). Attached patch makes
strftime() call tzset() only when actually necessary.

It might be preferrable to ratelimit tzset() stat() calls, to say single call
per few seconds - there's no sense in checking for timezone change thousands of
times per second.

-- 
           Summary: strftime() calls tzset() unnecessarily
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: pasky at suse dot cz
                CC: glibc-bugs at sources dot redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=6612

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