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# pthread_sigmask.m4 serial 7
dnl Copyright (C) 2011 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_PTHREAD_SIGMASK],
[
AC_CHECK_FUNCS_ONCE([pthread_sigmask])
LIB_PTHREAD_SIGMASK=
m4_ifdef([gl_THREADLIB], [
AC_REQUIRE([gl_THREADLIB])
if test "$gl_threads_api" = posix; then
if test $ac_cv_func_pthread_sigmask = yes; then
dnl pthread_sigmask is available without -lpthread.
:
else
if test -n "$LIBMULTITHREAD"; then
AC_CACHE_CHECK([for pthread_sigmask in $LIBMULTITHREAD],
[gl_cv_func_pthread_sigmask_in_LIBMULTITHREAD],
[gl_save_LIBS="$LIBS"
LIBS="$LIBS $LIBMULTITHREAD"
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <pthread.h>
#include <signal.h>
]],
[[return pthread_sigmask (0, (sigset_t *) 0, (sigset_t *) 0);]])
],
[gl_cv_func_pthread_sigmask_in_LIBMULTITHREAD=yes],
[gl_cv_func_pthread_sigmask_in_LIBMULTITHREAD=no])
LIBS="$gl_save_LIBS"
])
if test $gl_cv_func_pthread_sigmask_in_LIBMULTITHREAD = yes; then
dnl pthread_sigmask is available with -lpthread.
LIB_PTHREAD_SIGMASK="$LIBMULTITHREAD"
else
dnl pthread_sigmask is not available at all.
HAVE_PTHREAD_SIGMASK=0
fi
else
dnl pthread_sigmask is not available at all.
HAVE_PTHREAD_SIGMASK=0
fi
fi
else
dnl pthread_sigmask may exist but does not interoperate with the chosen
dnl multithreading facility.
dnl If "$gl_threads_api" = pth, we could use the function pth_sigmask,
dnl but it is equivalent to sigprocmask, so we choose to emulate
dnl pthread_sigmask with sigprocmask also in this case. This yields fewer
dnl link dependencies.
if test $ac_cv_func_pthread_sigmask = yes; then
REPLACE_PTHREAD_SIGMASK=1
else
HAVE_PTHREAD_SIGMASK=0
fi
fi
] ,[
dnl gl_THREADLIB is not in use. Assume the application wants
dnl POSIX semantics.
if test $ac_cv_func_pthread_sigmask != yes; then
gl_save_LIBS=$LIBS
AC_SEARCH_LIBS([pthread_sigmask], [pthread c_r])
LIBS=$gl_save_LIBS
if test "$ac_cv_search_pthread_sigmask" = no; then
HAVE_PTHREAD_SIGMASK=0
elif test "$ac_cv_search_pthread_sigmask" != 'none required'; then
LIB_PTHREAD_SIGMASK=$ac_cv_search_pthread_sigmask
fi
fi
])
AC_SUBST([LIB_PTHREAD_SIGMASK])
dnl We don't need a variable LTLIB_PTHREAD_SIGMASK, because when
dnl "$gl_threads_api" = posix, $LTLIBMULTITHREAD and $LIBMULTITHREAD are the
dnl same: either both empty or both "-lpthread".
])
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