mirror of
https://https.git.savannah.gnu.org/git/gnulib.git
synced 2026-09-01 11:16:02 +00:00
Paul Eggert
12a30be76f
Since sigprocmask should now be used only in single-threaded processes, move the locking from lib/sigprocmask.c to lib/pthread_sigmask.c. * lib/pthread_sigmask.c: If !HAVE_SIGPROCMASK && !GNULIB_PTHREAD_SIGMASK_SINGLE_THREAD, replace Gnulib sigprocmask with a thread-safe subsitute sigprocmask_r. Include glthread/lock.h to implement this. * lib/sigprocmask.c (gl_lock_define_initialized, gl_lock_lock) (gl_lock_unlock, sig_lock): Remove. All uses removed. Do not include glthread/lock.h. * m4/signalblocking.m4 (gl_SIGNALBLOCKING): Define HAVE_SIGPROCMASK, for the benefit of pthread_sigmask.c. * modules/pthread_sigmask (Depends-on): Add ‘lock’. * modules/sigprocmask (Depends-on): Remove ‘lock’.
49 lines
1.6 KiB
Plaintext
49 lines
1.6 KiB
Plaintext
@node pthread_sigmask
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@subsection @code{pthread_sigmask}
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@findex pthread_sigmask
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POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/functions/pthread_sigmask.html}
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Gnulib module: pthread_sigmask
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@mindex pthread_sigmask
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Portability problems fixed by Gnulib:
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@itemize
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@item
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This function is missing on some platforms:
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Minix 3.1.8, mingw, MSVC 14.
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@item
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This function is declared in @code{<pthread.h>} instead of @code{<signal.h>}
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on some platforms:
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FreeBSD 6.4, OpenBSD 3.8.
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@item
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This function requires compiling with @code{-pthread} and/or
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linking with @code{-lpthread} on some platforms:
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glibc 2.31, NetBSD, OpenBSD 5.8.
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@item
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This function does nothing and always returns 0 in programs that are not
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linked with @code{-lpthread} on some platforms:
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FreeBSD 14.0, MidnightBSD 1.1, HP-UX 11.31, Solaris 9.
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@item
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When it fails, this function returns @minus{}1 instead of the error number on
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some platforms:
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Cygwin 1.7.5,
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@c https://gnats.netbsd.org/cgi-bin/query-pr-single.pl?number=57214
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NetBSD 9.3 when libpthread is not in use.
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@end itemize
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Portability problems not fixed by Gnulib:
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@itemize
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@item
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On platforms that do not natively support this function,
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it has unspecified behavior in a multi-threaded process.
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For example, the Gnulib replacement on native MS-Windows can affect
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the signal masks of other threads, which can lead to race conditions.
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@item
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The Gnulib replacement on native MS-Windows is not async-signal-safe
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(see
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@url{https://pubs.opengroup.org/onlinepubs/9799919799/functions/V2_chap02.html#tag_16_04_03,
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POSIX section ``Signal Actions''}).
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@end itemize
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