sstream ctors inefficient in reentrant modes
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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: 4.2.1, 4.2.0, 4.1.4, 4.1.3, 4.1.2
Reporter: Martin Sebor
Priority: Critical
Fix For: 4.2.2
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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