projects / urcu.git / blame
| Commit | Line | Data |
|---|---|---|
| 3afcf5a0 OD |
1 | # SYNOPSIS |
| 2 | # | |
| 3 | # AE_CC_ATOMIC_BUILTINS([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]]) | |
| 4 | # | |
| 5 | # LICENSE | |
| 6 | # | |
| 7 | # Copyright (c) 2023 Michael Jeanson <mjeanson@efficios.com> | |
| 8 | # | |
| 9 | # This program is free software; you can redistribute it and/or modify it | |
| 10 | # under the terms of the GNU General Public License as published by the | |
| 11 | # Free Software Foundation; either version 2 of the License, or (at your | |
| 12 | # option) any later version. | |
| 13 | # | |
| 14 | # This program is distributed in the hope that it will be useful, but | |
| 15 | # WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 16 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General | |
| 17 | # Public License for more details. | |
| 18 | # | |
| 19 | # You should have received a copy of the GNU General Public License along | |
| 20 | # with this program. If not, see <https://www.gnu.org/licenses/>. | |
| 21 | # | |
| 22 | # As a special exception, the respective Autoconf Macro's copyright owner | |
| 23 | # gives unlimited permission to copy, distribute and modify the configure | |
| 24 | # scripts that are the output of Autoconf when processing the Macro. You | |
| 25 | # need not follow the terms of the GNU General Public License when using | |
| 26 | # or distributing such scripts, even though portions of the text of the | |
| 27 | # Macro appear in them. The GNU General Public License (GPL) does govern | |
| 28 | # all other use of the material that constitutes the Autoconf Macro. | |
| 29 | # | |
| 30 | # This special exception to the GPL applies to versions of the Autoconf | |
| 31 | # Macro released by the Autoconf Archive. When you make and distribute a | |
| 32 | # modified version of the Autoconf Macro, you may extend this special | |
| 33 | # exception to the GPL to apply to your modified version as well. | |
| 34 | ||
| 35 | #serial 1 | |
| 36 | ||
| 37 | AC_DEFUN([AE_CC_ATOMIC_BUILTINS], [ | |
| 38 | AC_REQUIRE([AC_PROG_CC]) | |
| 39 | AC_LANG_PUSH([C]) | |
| 40 | ||
| 41 | AC_CACHE_CHECK( | |
| 42 | [whether $CC supports atomic builtins], | |
| 43 | [ae_cv_cc_atomic_builtins], | |
| 44 | [ | |
| 45 | AC_LINK_IFELSE([ | |
| 46 | AC_LANG_PROGRAM([ | |
| 47 | int x, y; | |
| 48 | ],[ | |
| 49 | __atomic_store_n(&x, 0, __ATOMIC_RELAXED); | |
| 50 | __atomic_load_n(&x, __ATOMIC_RELAXED); | |
| 51 | y = __atomic_exchange_n(&x, 1, __ATOMIC_RELAXED); | |
| 52 | __atomic_compare_exchange_n(&x, &y, 0, 0, __ATOMIC_RELAXED, __ATOMIC_RELAXED); | |
| 53 | __atomic_add_fetch(&x, 1, __ATOMIC_RELAXED); | |
| 54 | __atomic_sub_fetch(&x, 1, __ATOMIC_RELAXED); | |
| 55 | __atomic_and_fetch(&x, 0x01, __ATOMIC_RELAXED); | |
| 56 | __atomic_or_fetch(&x, 0x01, __ATOMIC_RELAXED); | |
| 57 | __atomic_thread_fence(__ATOMIC_RELAXED); | |
| 58 | __atomic_signal_fence(__ATOMIC_RELAXED); | |
| 59 | ]) | |
| 60 | ],[ | |
| 61 | ae_cv_cc_atomic_builtins=yes | |
| 62 | ],[ | |
| 63 | ae_cv_cc_atomic_builtins=no | |
| 64 | ]) | |
| 65 | ] | |
| 66 | ) | |
| 67 | ||
| 68 | # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND: | |
| 69 | if test "x$ae_cv_cc_atomic_builtins" = "xyes"; then | |
| 70 | $1 | |
| 71 | : | |
| 72 | else | |
| 73 | $2 | |
| 74 | : | |
| 75 | fi | |
| 76 | ||
| 77 | AC_LANG_POP | |
| 78 | ])dnl AE_CC_ATOMIC_BUILTINS |