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authorPaolo Bonzini <pbonzini@redhat.com>2017-01-12 19:07:56 +0100
committerStefan Hajnoczi <stefanha@redhat.com>2017-01-16 13:25:18 +0000
commitabf90d39213cca30e92f6d72452a05cbf29969b8 (patch)
tree116e46fcb7b847b922582d806e95a51b138cf638
parent56d2c3c60d92dc24690b2e93b5f6ec4716ea06fa (diff)
aio: tweak walking in dispatch phase
Preparing for the following patch, use QLIST_FOREACH_SAFE and modify the placement of walking_handlers increment/decrement. Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Message-id: 20170112180800.21085-7-pbonzini@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
-rw-r--r--aio-posix.c26
-rw-r--r--aio-win32.c26
2 files changed, 24 insertions, 28 deletions
diff --git a/aio-posix.c b/aio-posix.c
index 25198d9013..f83b7af591 100644
--- a/aio-posix.c
+++ b/aio-posix.c
@@ -369,19 +369,17 @@ bool aio_pending(AioContext *ctx)
static bool aio_dispatch_handlers(AioContext *ctx)
{
- AioHandler *node;
+ AioHandler *node, *tmp;
bool progress = false;
/*
* We have to walk very carefully in case aio_set_fd_handler is
* called while we're walking.
*/
- node = QLIST_FIRST(&ctx->aio_handlers);
- while (node) {
- AioHandler *tmp;
- int revents;
+ ctx->walking_handlers++;
- ctx->walking_handlers++;
+ QLIST_FOREACH_SAFE(node, &ctx->aio_handlers, node, tmp) {
+ int revents;
revents = node->pfd.revents & node->pfd.events;
node->pfd.revents = 0;
@@ -405,17 +403,17 @@ static bool aio_dispatch_handlers(AioContext *ctx)
progress = true;
}
- tmp = node;
- node = QLIST_NEXT(node, node);
-
- ctx->walking_handlers--;
-
- if (!ctx->walking_handlers && tmp->deleted) {
- QLIST_REMOVE(tmp, node);
- g_free(tmp);
+ if (node->deleted) {
+ ctx->walking_handlers--;
+ if (!ctx->walking_handlers) {
+ QLIST_REMOVE(node, node);
+ g_free(node);
+ }
+ ctx->walking_handlers++;
}
}
+ ctx->walking_handlers--;
return progress;
}
diff --git a/aio-win32.c b/aio-win32.c
index d19dc429d8..1ad459d7ec 100644
--- a/aio-win32.c
+++ b/aio-win32.c
@@ -227,20 +227,18 @@ bool aio_pending(AioContext *ctx)
static bool aio_dispatch_handlers(AioContext *ctx, HANDLE event)
{
- AioHandler *node;
+ AioHandler *node, *tmp;
bool progress = false;
+ ctx->walking_handlers++;
+
/*
* We have to walk very carefully in case aio_set_fd_handler is
* called while we're walking.
*/
- node = QLIST_FIRST(&ctx->aio_handlers);
- while (node) {
- AioHandler *tmp;
+ QLIST_FOREACH_SAFE(node, &ctx->aio_handlers, node, tmp) {
int revents = node->pfd.revents;
- ctx->walking_handlers++;
-
if (!node->deleted &&
(revents || event_notifier_get_handle(node->e) == event) &&
node->io_notify) {
@@ -275,17 +273,17 @@ static bool aio_dispatch_handlers(AioContext *ctx, HANDLE event)
}
}
- tmp = node;
- node = QLIST_NEXT(node, node);
-
- ctx->walking_handlers--;
-
- if (!ctx->walking_handlers && tmp->deleted) {
- QLIST_REMOVE(tmp, node);
- g_free(tmp);
+ if (node->deleted) {
+ ctx->walking_handlers--;
+ if (!ctx->walking_handlers) {
+ QLIST_REMOVE(node, node);
+ g_free(node);
+ }
+ ctx->walking_handlers++;
}
}
+ ctx->walking_handlers--;
return progress;
}