thrd: On AIX 7.1 and 7.2, override also thrd_exit

[Bruno Haible]

I just noticed that the AIX thrd_join workaround is incomplete: The exit code
of the thread may not only be provided by a 'return' statement in the thread's
main function, but alternatively as an argument to thread_exit(). Thus
thread_exit must be overridden as well.

Done through this patch, with a new unit test.


2023-08-18  Bruno Haible  <bruno@clisp.org>

        thrd tests: Add unit test for thrd_exit.
        * tests/test-thrd_exit.c: New file, based on tests/test-thrd_create.c.
        * modules/thrd-tests (Files): Add it.
        (Makefile.am): Compile and run it.

        thrd: On AIX 7.1 and 7.2, override also thrd_exit.
        * lib/threads.in.h (thrd_exit): Consider REPLACE_THRD_EXIT.
        * lib/thrd.c (rpl_thrd_exit): New function.
        * m4/threads_h.m4 (gl_THREADS_H_DEFAULTS): Initialize REPLACE_THRD_EXIT.
        * m4/thrd.m4 (gl_FUNC_THRD_JOIN): Set also REPLACE_THRD_EXIT and adjust
        LIBSTDTHREAD.
        * modules/threads-h (Makefile.am): Substitute REPLACE_THRD_EXIT.
        * doc/posix-functions/thrd_exit.texi: Mention the AIX thrd_join problem
        also here.

0001-thrd-On-AIX-7.1-and-7.2-override-also-thrd_exit.patch
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0002-thrd-tests-Add-unit-test-for-thrd_exit.patch
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