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# pthread-spin.m4
# serial 8
dnl Copyright (C) 2019-2025 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.
dnl This file is offered as-is, without any warranty.
AC_DEFUN_ONCE([gl_PTHREAD_SPIN],
[
AC_REQUIRE([gl_PTHREAD_H_PART1])
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_SPIN_INIT=1
REPLACE_PTHREAD_SPIN_LOCK=1
REPLACE_PTHREAD_SPIN_TRYLOCK=1
REPLACE_PTHREAD_SPIN_UNLOCK=1
REPLACE_PTHREAD_SPIN_DESTROY=1
else
if test $HAVE_PTHREAD_H = 0 || test $HAVE_PTHREAD_SPINLOCK_T = 0; then
HAVE_PTHREAD_SPIN_INIT=0
HAVE_PTHREAD_SPIN_LOCK=0
HAVE_PTHREAD_SPIN_TRYLOCK=0
HAVE_PTHREAD_SPIN_UNLOCK=0
HAVE_PTHREAD_SPIN_DESTROY=0
else
dnl Test whether the gnulib module 'threadlib' is in use.
dnl Some packages like Emacs use --avoid=threadlib.
dnl Write the symbol in such a way that it does not cause 'aclocal' to pick
dnl the threadlib.m4 file that is installed in $PREFIX/share/aclocal/.
m4_ifdef([gl_][THREADLIB], [
AC_REQUIRE([gl_][THREADLIB])
dnl Test whether the functions actually exist.
dnl FreeBSD 5.2.1 declares them but does not define them.
AC_CACHE_CHECK([for pthread_spin_init],
[gl_cv_func_pthread_spin_init_in_LIBMULTITHREAD],
[gl_saved_LIBS="$LIBS"
LIBS="$LIBS $LIBMULTITHREAD"
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <pthread.h>
]],
[[pthread_spinlock_t lock;
return pthread_spin_init (&lock, 0);
]])
],
[gl_cv_func_pthread_spin_init_in_LIBMULTITHREAD=yes],
[gl_cv_func_pthread_spin_init_in_LIBMULTITHREAD=no])
LIBS="$gl_saved_LIBS"
])
if test $gl_cv_func_pthread_spin_init_in_LIBMULTITHREAD != yes; then
HAVE_PTHREAD_SPIN_INIT=0
REPLACE_PTHREAD_SPIN_INIT=1
HAVE_PTHREAD_SPIN_LOCK=0
REPLACE_PTHREAD_SPIN_LOCK=1
HAVE_PTHREAD_SPIN_TRYLOCK=0
REPLACE_PTHREAD_SPIN_TRYLOCK=1
HAVE_PTHREAD_SPIN_UNLOCK=0
REPLACE_PTHREAD_SPIN_UNLOCK=1
HAVE_PTHREAD_SPIN_DESTROY=0
REPLACE_PTHREAD_SPIN_DESTROY=1
fi
], [
:
])
fi
fi
])
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