Roger Leigh created XERCESC-2140:
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Summary: Add MutexMgr for C++11 mutex implementation
Key: XERCESC-2140
URL: https://issues.apache.org/jira/browse/XERCESC-2140
Project: Xerces-C++
Issue Type: Improvement
Components: Utilities
Affects Versions: 3.2.1
Reporter: Roger Leigh
Assignee: Roger Leigh
Attachments: 0001-StdMutexMgr-Add-C-11-mutex-manager.patch
Xalan currently supports two mutex managers: POSIX and Windows (and NoThreads,
which doesn't really count). With the advent of C++11, it's no longer
necessary to use platform-specific threading facilities, since it's built
directly into the standard library. The attached patch adds a StdMutexMgr
which uses a C++11 mutex, and will work on Unix or Windows systems with a
sufficiently new compiler. thread/mutex were implemented years ago, so all
recent and not so recent systems should support it. For those that don't, it
will fall back to the POSIX/Windows managers and behave like before.
Options have been added to manually select the desired manager as for other
options for both cmake and autoconf (standard/posix/windows/nothreads).
Documented in more detail on the build page.
It's tested on Linux/MacOS X/Windows with a variety of manager combinations,
and all looks fine so far. Any testing/comments much appreciated. It's a
compatible addition, so could go into 3.2.2 if that's acceptable, otherwise
could wait for later.
Looking at all of the manager implementations, one key defect (likely
intentional design), is that there is zero exception safety. No currently held
mutex will be released if an exception gets thrown. That could be prevented by
moving to using C++11 threading entirely, and using std::lock_guard, which will
automatically release locks on unwind.
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