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Subject: [Bug libstdc++/103382] condition_variable::wait() is not cancellable
 because it is marked noexcept
Date: Thu, 09 Dec 2021 23:27:23 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103382

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jonathan Wakely <redi@gcc.gnu.org>:

https://gcc.gnu.org/g:9e18a25331fa25c3907249fede65a02c6817b06e

commit r12-5877-g9e18a25331fa25c3907249fede65a02c6817b06e
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue Dec 7 15:11:15 2021 +0000

    libstdc++: Allow std::condition_variable waits to be cancelled [PR10338=
2]

    std::condition_variable::wait(unique_lock<mutex>&) is incorrectly marked
    noexcept, which means that the __forced_unwind exception used by NPTL
    cancellation will terminate the process. It should allow exceptions to
    pass through, so that a thread can be cleanly cancelled when waiting on
    a condition variable.

    The new behaviour is exported as a new version of the symbol, to avoid
    an ABI break for existing code linked to the non-throwing definition of
    the function. Code linked against older releases will have a reference
    to the @GLIBCXX_3.4.11 version, andcode compiled against the new
    libstdc++ will get a reference to the @@GLIBCXX_3.4.30 version.

    libstdc++-v3/ChangeLog:

            PR libstdc++/103382
            * config/abi/pre/gnu.ver (GLIBCXX_3.4.11): Do not export old
            symbol if .symver renaming is supported.
            (GLIBCXX_3.4.30): Export new symbol if .symver renaming is
            supported.
            * doc/xml/manual/evolution.xml: Document change.
            * doc/html/manual/api.html: Regenerate.
            * include/bits/std_mutex.h (__condvar::wait,
__condvar::wait_until):
            Remove noexcept.
            * include/std/condition_variable (condition_variable::wait):
            Likewise.
            * src/c++11/condition_variable.cc (condition_variable::wait):
            Likewise.
            * src/c++11/compatibility-condvar.cc (__nothrow_wait_cv::wait):
            Define nothrow wrapper around std::condition_variable::wait and
            export the old symbol as an alias to it.
            * testsuite/30_threads/condition_variable/members/103382.cc: New
test.=