projects / urcu.git / blame
| Commit | Line | Data |
|---|---|---|
| 1c64a40d MJ |
1 | # SPDX-License-Identifier: GPL-2.0-or-later WITH LicenseRef-Autoconf-exception-macro |
| 2 | # SPDX-FileCopyrightText: 2023 Michael Jeanson <mjeanson@efficios.com> | |
| 3 | # | |
| 3afcf5a0 OD |
4 | # SYNOPSIS |
| 5 | # | |
| 6 | # AE_CC_ATOMIC_BUILTINS([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]]) | |
| 7 | # | |
| 3afcf5a0 OD |
8 | |
| 9 | #serial 1 | |
| 10 | ||
| 11 | AC_DEFUN([AE_CC_ATOMIC_BUILTINS], [ | |
| 12 | AC_REQUIRE([AC_PROG_CC]) | |
| 13 | AC_LANG_PUSH([C]) | |
| 14 | ||
| 15 | AC_CACHE_CHECK( | |
| 16 | [whether $CC supports atomic builtins], | |
| 17 | [ae_cv_cc_atomic_builtins], | |
| 18 | [ | |
| 19 | AC_LINK_IFELSE([ | |
| 20 | AC_LANG_PROGRAM([ | |
| 21 | int x, y; | |
| 22 | ],[ | |
| 23 | __atomic_store_n(&x, 0, __ATOMIC_RELAXED); | |
| 24 | __atomic_load_n(&x, __ATOMIC_RELAXED); | |
| 25 | y = __atomic_exchange_n(&x, 1, __ATOMIC_RELAXED); | |
| 26 | __atomic_compare_exchange_n(&x, &y, 0, 0, __ATOMIC_RELAXED, __ATOMIC_RELAXED); | |
| 27 | __atomic_add_fetch(&x, 1, __ATOMIC_RELAXED); | |
| 28 | __atomic_sub_fetch(&x, 1, __ATOMIC_RELAXED); | |
| 29 | __atomic_and_fetch(&x, 0x01, __ATOMIC_RELAXED); | |
| 30 | __atomic_or_fetch(&x, 0x01, __ATOMIC_RELAXED); | |
| 31 | __atomic_thread_fence(__ATOMIC_RELAXED); | |
| 32 | __atomic_signal_fence(__ATOMIC_RELAXED); | |
| 33 | ]) | |
| 34 | ],[ | |
| 35 | ae_cv_cc_atomic_builtins=yes | |
| 36 | ],[ | |
| 37 | ae_cv_cc_atomic_builtins=no | |
| 38 | ]) | |
| 39 | ] | |
| 40 | ) | |
| 41 | ||
| 42 | # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND: | |
| 43 | if test "x$ae_cv_cc_atomic_builtins" = "xyes"; then | |
| 44 | $1 | |
| 45 | : | |
| 46 | else | |
| 47 | $2 | |
| 48 | : | |
| 49 | fi | |
| 50 | ||
| 51 | AC_LANG_POP | |
| 52 | ])dnl AE_CC_ATOMIC_BUILTINS |