diff options
Diffstat (limited to 'gnulib-m4/pthread-spin.m4')
| -rw-r--r-- | gnulib-m4/pthread-spin.m4 | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/gnulib-m4/pthread-spin.m4 b/gnulib-m4/pthread-spin.m4 new file mode 100644 index 00000000..67a50fa4 --- /dev/null +++ b/gnulib-m4/pthread-spin.m4 @@ -0,0 +1,71 @@ +# pthread-spin.m4 +# serial 8 +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_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 +]) |