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build: try to find some kind of atomic ops
Either one of: - ISO C11 - gcc __atomic_* - gcc/clang __sync_* Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
This commit is contained in:
David Lamparter
parent
8aa42b826c
commit
899a4fd2a1
66
configure.ac
66
configure.ac
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@ -541,6 +541,72 @@ AC_CHECK_HEADERS([stropts.h sys/ksym.h \
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linux/version.h asm/types.h \
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sys/cdefs.h])
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ac_stdatomic_ok=false
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AC_DEFINE(FRR_AUTOCONF_ATOMIC, 1, [did autoconf checks for atomic funcs])
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AC_CHECK_HEADER([stdatomic.h],[
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AC_MSG_CHECKING([whether _Atomic qualifier works])
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AC_LINK_IFELSE([AC_LANG_SOURCE([[
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#include <stdatomic.h>
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int main(int argc, char **argv) {
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_Atomic int i = 0;
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return i;
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}
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]])], [
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AC_DEFINE(HAVE_STDATOMIC_H, 1, [found stdatomic.h])
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AC_MSG_RESULT([yes])
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ac_stdatomic_ok=true
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], [
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AC_MSG_RESULT([no])
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])
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])
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AS_IF([$ac_stdatomic_ok], [true], [
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AC_MSG_CHECKING([for __atomic_* builtins])
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AC_LINK_IFELSE([AC_LANG_SOURCE([[
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int main(int argc, char **argv) {
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volatile int i = 1;
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__atomic_store_n (&i, 0, __ATOMIC_RELEASE);
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return __atomic_load_n (&i, __ATOMIC_ACQUIRE);
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}
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]])], [
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AC_DEFINE(HAVE___ATOMIC, 1, [found __atomic builtins])
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AC_MSG_RESULT([yes])
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], [
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AC_MSG_RESULT([no])
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dnl FreeBSD 9 has a broken stdatomic.h where _Atomic doesn't work
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AC_MSG_CHECKING([for __sync_* builtins])
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AC_LINK_IFELSE([AC_LANG_SOURCE([[
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int main(int argc, char **argv) {
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volatile int i = 1;
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__sync_fetch_and_sub (&i, 1);
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return __sync_val_compare_and_swap (&i, 0, 1);
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}
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]])], [
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AC_DEFINE(HAVE___SYNC, 1, [found __sync builtins])
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AC_MSG_RESULT([yes])
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AC_MSG_CHECKING([for __sync_swap builtin])
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AC_LINK_IFELSE([AC_LANG_SOURCE([[
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int main(int argc, char **argv) {
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volatile int i = 1;
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return __sync_swap (&i, 2);
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}
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]])], [
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AC_DEFINE(HAVE___SYNC_SWAP, 1, [found __sync_swap builtin])
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AC_MSG_RESULT([yes])
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], [
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AC_MSG_RESULT([no])
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])
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], [
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AC_MSG_RESULT([no])
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AC_MSG_FAILURE([stdatomic.h unavailable and $CC has neither __atomic nor __sync builtins])
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])
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])
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])
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dnl Utility macro to avoid retyping includes all the time
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m4_define([FRR_INCLUDES],
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[#ifdef SUNOS_5
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@ -38,6 +38,7 @@ BUILT_SOURCES = route_types.h gitversion.h command_parse.h command_lex.h
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libfrr_la_LIBADD = @LIBCAP@
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pkginclude_HEADERS = \
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frratomic.h \
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buffer.h checksum.h filter.h getopt.h hash.h \
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if.h linklist.h log.h \
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graph.h command_match.h \
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118
lib/frratomic.h
Normal file
118
lib/frratomic.h
Normal file
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@ -0,0 +1,118 @@
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/*
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* Copyright (c) 2015-16 David Lamparter, for NetDEF, Inc.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef _FRRATOMIC_H
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#define _FRRATOMIC_H
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifndef FRR_AUTOCONF_ATOMIC
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#error autoconf checks for atomic functions were not properly run
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#endif
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/* ISO C11 */
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#ifdef HAVE_STDATOMIC_H
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#include <stdatomic.h>
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/* gcc 4.7 and newer */
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#elif defined(HAVE___ATOMIC)
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#define _Atomic volatile
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#define memory_order_relaxed __ATOMIC_RELAXED
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#define memory_order_consume __ATOMIC_CONSUME
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#define memory_order_acquire __ATOMIC_ACQUIRE
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#define memory_order_release __ATOMIC_RELEASE
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#define memory_order_acq_rel __ATOMIC_ACQ_REL
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#define memory_order_seq_cst __ATOMIC_SEQ_CST
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#define atomic_load_explicit __atomic_load_n
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#define atomic_store_explicit __atomic_store_n
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#define atomic_exchange_explicit __atomic_exchange_n
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#define atomic_fetch_add_explicit __atomic_fetch_add
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#define atomic_fetch_sub_explicit __atomic_fetch_sub
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#define atomic_compare_exchange_weak_explicit(atom, expect, desire, mem1, mem2) \
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__atomic_compare_exchange_n(atom, expect, desire, 1, mem1, mem2)
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/* gcc 4.1 and newer,
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* clang 3.3 (possibly older)
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*
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* __sync_swap isn't in gcc's documentation, but clang has it
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*
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* note __sync_synchronize()
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*/
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#elif defined(HAVE___SYNC)
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#define _Atomic volatile
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#define memory_order_relaxed 0
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#define memory_order_consume 0
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#define memory_order_acquire 0
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#define memory_order_release 0
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#define memory_order_acq_rel 0
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#define memory_order_seq_cst 0
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#define atomic_load_explicit(ptr, mem) \
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({ __sync_synchronize(); \
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typeof(*ptr) rval = __sync_fetch_and_add((ptr), 0); \
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__sync_synchronize(); rval; })
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#define atomic_store_explicit(ptr, val, mem) \
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({ __sync_synchronize(); \
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*(ptr) = (val); \
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__sync_synchronize(); (void)0; })
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#ifdef HAVE___SYNC_SWAP
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#define atomic_exchange_explicit(ptr, val, mem) \
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({ __sync_synchronize(); \
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typeof(*ptr) rval = __sync_swap((ptr, val), 0); \
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__sync_synchronize(); rval; })
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#else /* !HAVE___SYNC_SWAP */
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#define atomic_exchange_explicit(ptr, val, mem) \
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({ typeof(ptr) _ptr = (ptr); typeof(val) _val = (val); \
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__sync_synchronize(); \
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typeof(*ptr) old1, old2 = __sync_fetch_and_add(_ptr, 0); \
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do { \
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old1 = old2; \
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old2 = __sync_val_compare_and_swap (_ptr, old1, _val); \
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} while (old1 != old2); \
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__sync_synchronize(); \
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old2; \
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})
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#endif /* !HAVE___SYNC_SWAP */
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#define atomic_fetch_add_explicit(ptr, val, mem) \
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({ __sync_synchronize(); \
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typeof(*ptr) rval = __sync_fetch_and_add((ptr), (val)); \
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__sync_synchronize(); rval; })
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#define atomic_fetch_sub_explicit(ptr, val, mem) \
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({ __sync_synchronize(); \
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typeof(*ptr) rval = __sync_fetch_and_sub((ptr), (val)); \
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__sync_synchronize(); rval; })
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#define atomic_compare_exchange_weak_explicit(atom, expect, desire, mem1, mem2) \
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({ typeof(atom) _atom = (atom); typeof(expect) _expect = (expect); \
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typeof(desire) _desire = (desire); \
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__sync_synchronize(); \
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typeof(*atom) rval = __sync_val_compare_and_swap(_atom, *_expect, _desire); \
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__sync_synchronize(); \
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bool ret = (rval == *_expect); *_expect = rval; ret; })
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#else /* !HAVE___ATOMIC && !HAVE_STDATOMIC_H */
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#error no atomic functions...
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#endif
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#endif /* _FRRATOMIC_H */
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