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Posted to bugs@apr.apache.org by bu...@apache.org on 2010/09/04 19:35:29 UTC

DO NOT REPLY [Bug 49882] New: if an application uses poll/unix/select.c:apr_pollset_poll() to poll fds it can use 100% CPU time under some circumstances

https://issues.apache.org/bugzilla/show_bug.cgi?id=49882

           Summary: if an application uses
                    poll/unix/select.c:apr_pollset_poll() to poll fds it
                    can use 100% CPU time under some circumstances
           Product: APR
           Version: HEAD
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P2
         Component: APR
        AssignedTo: bugs@apr.apache.org
        ReportedBy: sr-dev@gmx.net


Created an attachment (id=25988)
 --> (https://issues.apache.org/bugzilla/attachment.cgi?id=25988)
add a apr_sleep() if a timeout greater than zero was specified.

If an application uses the apr_pollset_poll() function under Windows and has no
fds added to the pollset the current implementation shortcuts this situation
without waiting the specified time given in the timeout parameter.

If an application no uses a normal event loop it apr_pollset_poll() returns
immediately with APR_SUCCESS. Thus the application is busy waiting and uses
100% of CPU time.

See the attached patch to resolve this issue. Found in version 1.4.2.

Regards,
Stefan

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DO NOT REPLY [Bug 49882] 100% CPU time in poll/unix/select.c:apr_pollset_poll() to poll fds under some circumstances

Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=49882

Jeff Trawick <tr...@apache.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #1 from Jeff Trawick <tr...@apache.org> 2011-04-06 08:52:03 EDT ---
fixed in trunk r1089433
I'll consider backporting to 1.4.x after the upcoming 1.4.3 release

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[Bug 49882] 100% CPU time in poll/unix/select.c:apr_pollset_poll() to poll fds under some circumstances

Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=49882

Jeff Trawick <tr...@apache.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED

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DO NOT REPLY [Bug 49882] 100% CPU time in poll/unix/select.c:apr_pollset_poll() to poll fds under some circumstances

Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=49882

--- Comment #2 from William A. Rowe Jr. <wr...@apache.org> 2011-04-06 13:12:00 EDT ---
I'd actually suggest to @bug this in the doxygen and fix at 1.5.0/2.0.0, so
that authors can know that the 1.4.x API did *not* support empty pollsets?

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DO NOT REPLY [Bug 49882] 100% CPU time in poll/unix/select.c:apr_pollset_poll() to poll fds under some circumstances

Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=49882

Stefan Ruppert <sr...@myarm.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|if an application uses      |100% CPU time in
                   |poll/unix/select.c:apr_poll |poll/unix/select.c:apr_poll
                   |set_poll() to poll fds it   |set_poll() to poll fds
                   |can use 100% CPU time under |under some circumstances
                   |some circumstances          |

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