Author: ed
Date: Sun Jun 30 08:59:33 2013
New Revision: 252412
URL: http://svnweb.freebsd.org/changeset/base/252412
Log:
Convert this piece of code to use C11 atomics.
As mentioned before, we should at least aim to have one piece of code in
both user space and kernel space that uses C11 atomics, to get some
coverage. This piece of code can be migrated trivially, so it's a good
candidate.
Modified:
head/lib/librt/sigev_thread.c
Modified: head/lib/librt/sigev_thread.c
==============================================================================
--- head/lib/librt/sigev_thread.c Sun Jun 30 08:54:41 2013
(r252411)
+++ head/lib/librt/sigev_thread.c Sun Jun 30 08:59:33 2013
(r252412)
@@ -28,13 +28,13 @@
*/
#include <sys/types.h>
-#include <machine/atomic.h>
#include "namespace.h"
#include <err.h>
#include <errno.h>
#include <ucontext.h>
#include <sys/thr.h>
+#include <stdatomic.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@@ -51,7 +51,7 @@ LIST_HEAD(sigev_list_head, sigev_node);
static struct sigev_list_head sigev_hash[HASH_QUEUES];
static struct sigev_list_head sigev_all;
static LIST_HEAD(,sigev_thread) sigev_threads;
-static unsigned int sigev_generation;
+static atomic_int sigev_generation;
static pthread_mutex_t *sigev_list_mtx;
static pthread_once_t sigev_once = PTHREAD_ONCE_INIT;
static pthread_once_t sigev_once_default = PTHREAD_ONCE_INIT;
@@ -196,7 +196,8 @@ __sigev_alloc(int type, const struct sig
if (sn != NULL) {
sn->sn_value = evp->sigev_value;
sn->sn_func = evp->sigev_notify_function;
- sn->sn_gen = atomic_fetchadd_int(&sigev_generation, 1);
+ sn->sn_gen = atomic_fetch_add_explicit(&sigev_generation, 1,
+ memory_order_relaxed);
sn->sn_type = type;
_pthread_attr_init(&sn->sn_attr);
_pthread_attr_setdetachstate(&sn->sn_attr,
PTHREAD_CREATE_DETACHED);
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