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https://issues.apache.org/jira/browse/STDCXX-914?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Sebor updated STDCXX-914:
--------------------------------
Attachment: stdcxx-914.gprof
Attached full gprof output for a library and test +this time+ both +really+
compiled with -D_RWSTD_USE_STRING_ATOMIC_OPS on the command line (see
STDCXX-162).
> 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
>
> Original Estimate: 12h
> Remaining Estimate: 12h
>
> 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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