| # pthread-spin.m4 | |
| # serial 8 | |
| dnl Copyright (C) 2019-2026 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 | |
| ]) |