pthread_sigmask: new module
* MODULES.html.sh (Support for systems lacking POSIX:2008): Add it. * doc/posix-functions/pthread_sigmask.texi: Document new module. * lib/signal.in.h (pthread_sigmask): Arrange for replacement. This is done only as a macro; I don't know how well that'll work for C++. Move <sys/types.h> include before the include_next, to avoid mishap on Solaris. * m4/signal_h.m4 (gl_SIGNAL_H, gl_SIGNAL_H_DEFAULTS): Check for it. * modules/signal (Makefile.am): Substitute the check's results. * modules/pthread_sigmask, m4/pthread_sigmask.m4: New files.
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