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Filters: If somebody doesn't like _Thread_local, don't fail for now, just be a little slower.

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When the parallel execution comes into place, we'll likely enforce this
C11 feature. It's much simpler and also faster than pthread_[sg]etspecific().
This commit is contained in:
Jan Maria Matejka 2019-05-23 11:27:24 +00:00
parent 23e3b1e665
commit 6479e403ef
4 changed files with 55 additions and 18 deletions
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21
aclocal.m4 vendored
View File

@ -1,6 +1,25 @@
dnl ** Additional Autoconf tests for BIRD configure script
dnl ** (c) 1999 Martin Mares <mj@ucw.cz>
AC_DEFUN([BIRD_CHECK_THREAD_LOCAL],
[
AC_CACHE_CHECK(
[whether _Thread_local is known],
[bird_cv_thread_local],
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM(
[
_Thread_local static int x = 42;
],
[]
)
],
[bird_cv_thread_local=yes],
[bird_cv_thread_local=no]
)
)
])
AC_DEFUN([BIRD_CHECK_PTHREADS],
[
bird_tmp_cflags="$CFLAGS"
@ -134,7 +153,7 @@ AC_DEFUN([BIRD_CHECK_ANDROID_LOG],
AC_DEFUN([BIRD_CHECK_LTO],
[
bird_tmp_cflags="$CFLAGS"
bird_tmp_ldflags="$CFLAGS"
bird_tmp_ldflags="$LDFLAGS"
CFLAGS="-flto"
LDFLAGS="-flto"

5
configure.ac
View File

@ -115,6 +115,11 @@ if test -z "$GCC" ; then
AC_MSG_ERROR([This program requires the GNU C Compiler.])
fi
BIRD_CHECK_THREAD_LOCAL
if test "$bird_cv_thread_local" = yes ; then
AC_DEFINE([HAVE_THREAD_LOCAL], [1], [Define to 1 if _Thread_local is available])
fi
if test "$enable_pthreads" != no ; then
BIRD_CHECK_PTHREADS

41
filter/filter.c
View File

@ -51,7 +51,7 @@
#include "filter/data.h"
/* Internal filter state, to be allocated on stack when executing filters */
_Thread_local struct filter_state {
struct filter_state {
/* The route we are processing. This may be NULL to indicate no route available. */
struct rte **rte;
@ -63,7 +63,14 @@ _Thread_local struct filter_state {
struct linpool *pool;
struct buffer buf;
int flags;
} filter_state;
};
#if HAVE_THREAD_LOCAL
_Thread_local static struct filter_state filter_state;
#define FS_INIT(...) filter_state = (struct filter_state) { __VA_ARGS__ }
#else
#define FS_INIT(...) struct filter_state filter_state = { __VA_ARGS__ }
#endif
void (*bt_assert_hook)(int result, const struct f_line_item *assert);
@ -275,11 +282,11 @@ f_run(const struct filter *filter, struct rte **rte, struct linpool *tmp_pool, i
DBG( "Running filter `%s'...", filter->name );
/* Initialize the filter state */
filter_state = (struct filter_state) {
.rte = rte,
.pool = tmp_pool,
.flags = flags,
};
FS_INIT(
.rte = rte,
.pool = tmp_pool,
.flags = flags,
);
LOG_BUFFER_INIT(filter_state.buf);
@ -338,10 +345,10 @@ f_run(const struct filter *filter, struct rte **rte, struct linpool *tmp_pool, i
enum filter_return
f_eval_rte(const struct f_line *expr, struct rte **rte, struct linpool *tmp_pool)
{
filter_state = (struct filter_state) {
.rte = rte,
.pool = tmp_pool,
};
FS_INIT(
.rte = rte,
.pool = tmp_pool,
);
LOG_BUFFER_INIT(filter_state.buf);
@ -360,9 +367,9 @@ f_eval_rte(const struct f_line *expr, struct rte **rte, struct linpool *tmp_pool
enum filter_return
f_eval(const struct f_line *expr, struct linpool *tmp_pool, struct f_val *pres)
{
filter_state = (struct filter_state) {
.pool = tmp_pool,
};
FS_INIT(
.pool = tmp_pool,
);
LOG_BUFFER_INIT(filter_state.buf);
@ -379,9 +386,9 @@ uint
f_eval_int(const struct f_line *expr)
{
/* Called independently in parse-time to eval expressions */
filter_state = (struct filter_state) {
.pool = cfg_mem,
};
FS_INIT(
.pool = cfg_mem,
);
struct f_val val;

6
lib/birdlib.h
View File

@ -73,6 +73,12 @@ static inline int u64_cmp(u64 i1, u64 i2)
#define UNUSED __attribute__((unused))
#define PACKED __attribute__((packed))
#ifdef HAVE_THREAD_LOCAL
#define THREAD_LOCAL _Thread_local
#else
#define THREAD_LOCAL
#endif
/* Microsecond time */
typedef s64 btime;