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# pthread-once.m4
# serial 3
dnl Copyright (C) 2019-2024 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_PTHREAD_ONCE],
[
AC_REQUIRE([gl_PTHREAD_H])
AC_REQUIRE([AC_CANONICAL_HOST])
if { case "$host_os" in mingw* | windows*) true;; *) false;; esac; } \
&& test $gl_threads_api = windows; then
dnl Choose function names that don't conflict with the mingw-w64 winpthreads
dnl library.
REPLACE_PTHREAD_ONCE=1
else
if test $HAVE_PTHREAD_H = 0; then
HAVE_PTHREAD_ONCE=0
else
dnl Work around Cygwin 3.5.3 bug.
AC_CACHE_CHECK([whether pthread_once works],
[gl_cv_func_pthread_once_works],
[case "$host_os" in
cygwin*) gl_cv_func_pthread_once_works="guessing no" ;;
*) gl_cv_func_pthread_once_works="yes" ;;
esac
])
case "$gl_cv_func_pthread_once_works" in
*yes) ;;
*) REPLACE_PTHREAD_ONCE=1 ;;
esac
fi
fi
])
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