72 lines
2.6 KiB
Text
72 lines
2.6 KiB
Text
# pthread-spin.m4
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# serial 8
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dnl Copyright (C) 2019-2025 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl This file is offered as-is, without any warranty.
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AC_DEFUN_ONCE([gl_PTHREAD_SPIN],
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[
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AC_REQUIRE([gl_PTHREAD_H_PART1])
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AC_REQUIRE([AC_CANONICAL_HOST])
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if { case "$host_os" in mingw* | windows*) true;; *) false;; esac; } \
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&& test $gl_threads_api = windows; then
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dnl Choose function names that don't conflict with the mingw-w64 winpthreads
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dnl library.
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REPLACE_PTHREAD_SPIN_INIT=1
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REPLACE_PTHREAD_SPIN_LOCK=1
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REPLACE_PTHREAD_SPIN_TRYLOCK=1
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REPLACE_PTHREAD_SPIN_UNLOCK=1
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REPLACE_PTHREAD_SPIN_DESTROY=1
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else
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if test $HAVE_PTHREAD_H = 0 || test $HAVE_PTHREAD_SPINLOCK_T = 0; then
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HAVE_PTHREAD_SPIN_INIT=0
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HAVE_PTHREAD_SPIN_LOCK=0
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HAVE_PTHREAD_SPIN_TRYLOCK=0
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HAVE_PTHREAD_SPIN_UNLOCK=0
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HAVE_PTHREAD_SPIN_DESTROY=0
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else
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dnl Test whether the gnulib module 'threadlib' is in use.
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dnl Some packages like Emacs use --avoid=threadlib.
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dnl Write the symbol in such a way that it does not cause 'aclocal' to pick
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dnl the threadlib.m4 file that is installed in $PREFIX/share/aclocal/.
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m4_ifdef([gl_][THREADLIB], [
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AC_REQUIRE([gl_][THREADLIB])
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dnl Test whether the functions actually exist.
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dnl FreeBSD 5.2.1 declares them but does not define them.
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AC_CACHE_CHECK([for pthread_spin_init],
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[gl_cv_func_pthread_spin_init_in_LIBMULTITHREAD],
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[gl_saved_LIBS="$LIBS"
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LIBS="$LIBS $LIBMULTITHREAD"
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AC_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <pthread.h>
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]],
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[[pthread_spinlock_t lock;
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return pthread_spin_init (&lock, 0);
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]])
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],
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[gl_cv_func_pthread_spin_init_in_LIBMULTITHREAD=yes],
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[gl_cv_func_pthread_spin_init_in_LIBMULTITHREAD=no])
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LIBS="$gl_saved_LIBS"
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])
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if test $gl_cv_func_pthread_spin_init_in_LIBMULTITHREAD != yes; then
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HAVE_PTHREAD_SPIN_INIT=0
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REPLACE_PTHREAD_SPIN_INIT=1
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HAVE_PTHREAD_SPIN_LOCK=0
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REPLACE_PTHREAD_SPIN_LOCK=1
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HAVE_PTHREAD_SPIN_TRYLOCK=0
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REPLACE_PTHREAD_SPIN_TRYLOCK=1
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HAVE_PTHREAD_SPIN_UNLOCK=0
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REPLACE_PTHREAD_SPIN_UNLOCK=1
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HAVE_PTHREAD_SPIN_DESTROY=0
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REPLACE_PTHREAD_SPIN_DESTROY=1
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fi
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], [
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:
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])
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fi
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fi
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])
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