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From "Martin Sebor (JIRA)" <j...@apache.org>
Subject [jira] Updated: (STDCXX-914) sstream ctors inefficient in reentrant modes
Date Sat, 08 Nov 2008 18:06:44 GMT

     [ https://issues.apache.org/jira/browse/STDCXX-914?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Martin Sebor updated STDCXX-914:
--------------------------------

    Attachment:     (was: stdcxx-914.gprof)

> sstream ctors inefficient in reentrant modes
> --------------------------------------------
>
>                 Key: STDCXX-914
>                 URL: https://issues.apache.org/jira/browse/STDCXX-914
>             Project: C++ Standard Library
>          Issue Type: Improvement
>          Components: 27. Input/Output
>    Affects Versions: 4.1.2, 4.1.3, 4.1.4, 4.2.0, 4.2.1
>            Reporter: Martin Sebor
>            Priority: Critical
>             Fix For: 4.2.2
>
>         Attachments: stdcxx-914-gprof-gcc-4.3.0-12S.txt
>
>   Original Estimate: 12h
>          Time Spent: 1h
>  Remaining Estimate: 11h
>
> As discussed in this [thread|http://markmail.org/message/hqlsw5dq23gx7d4o] stream ctors
in thread-safe builds are inefficient due to the initialization of the mutex data member in
every stream, even in those that never use it. As soon as binary compatibility rules permit
it we should remove the mutex and/or defer its initialization until it's needed. It might
be possible to implement the deferred initialization as early as 4.2.2, or maybe 4.3. Complete
removal will need to wait until 5.0.

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