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authorGarrett D'Amore <garrett@damore.org>2017-06-28 23:07:28 -0700
committerGarrett D'Amore <garrett@damore.org>2017-06-28 23:07:28 -0700
commitfe3c9705072ac8cafecdf2ea6bca4c26f9464824 (patch)
tree07aaea70cbf8bb6af369d5efede475ed03ffdd63 /src/protocol/bus
parent10d748fa6444324878a77cc5749c93b75819ced2 (diff)
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Refactor stop again, closing numerous races (thanks valgrind!)
Diffstat (limited to 'src/protocol/bus')
-rw-r--r--src/protocol/bus/bus.c51
1 files changed, 14 insertions, 37 deletions
diff --git a/src/protocol/bus/bus.c b/src/protocol/bus/bus.c
index cb624a10..1c32fec6 100644
--- a/src/protocol/bus/bus.c
+++ b/src/protocol/bus/bus.c
@@ -51,7 +51,6 @@ struct nni_bus_pipe {
nni_aio aio_send;
nni_aio aio_putq;
nni_mtx mtx;
- int refcnt;
};
@@ -133,7 +132,6 @@ nni_bus_pipe_init(void **pp, nni_pipe *npipe, void *psock)
return (NNG_ENOMEM);
}
NNI_LIST_NODE_INIT(&ppipe->node);
- ppipe->refcnt = 0;
if (((rv = nni_mtx_init(&ppipe->mtx)) != 0) ||
((rv = nni_msgq_init(&ppipe->sendq, 16)) != 0)) {
goto fail;
@@ -176,12 +174,6 @@ nni_bus_pipe_start(void *arg)
nni_list_append(&psock->pipes, ppipe);
nni_mtx_unlock(&psock->mtx);
- // Mark the ppipe busy twice -- once for each of the oustanding
- // asynchronous "threads" of operation.
- nni_mtx_lock(&ppipe->mtx);
- ppipe->refcnt = 2;
- nni_mtx_unlock(&ppipe->mtx);
-
nni_bus_pipe_recv(ppipe);
nni_bus_pipe_getq(ppipe);
@@ -189,40 +181,24 @@ nni_bus_pipe_start(void *arg)
}
-// nni_bus_pipe_stop is called only internally when one of our handlers notices
-// that the transport layer has closed. This allows us to stop all further
-// actions.
static void
-nni_bus_pipe_stop(nni_bus_pipe *ppipe)
+nni_bus_pipe_stop(void *arg)
{
- int refcnt;
+ nni_bus_pipe *ppipe = arg;
nni_bus_sock *psock = ppipe->psock;
- // As we are called only on error paths, shut down the underlying
- // pipe transport. This should cause any other consumer to also get
- // a suitable error (NNG_ECLOSED), so that we can shut down completely.
- nni_pipe_close(ppipe->npipe);
+ nni_msgq_close(ppipe->sendq);
+
+ nni_aio_stop(&ppipe->aio_getq);
+ nni_aio_stop(&ppipe->aio_send);
+ nni_aio_stop(&ppipe->aio_recv);
+ nni_aio_stop(&ppipe->aio_putq);
nni_mtx_lock(&ppipe->psock->mtx);
if (nni_list_active(&psock->pipes, ppipe)) {
nni_list_remove(&psock->pipes, ppipe);
-
- nni_msgq_close(ppipe->sendq);
- nni_msgq_aio_cancel(nni_sock_recvq(psock->nsock),
- &ppipe->aio_putq);
}
nni_mtx_unlock(&ppipe->psock->mtx);
-
- nni_mtx_lock(&ppipe->mtx);
- NNI_ASSERT(ppipe->refcnt > 0);
- refcnt = --ppipe->refcnt;
- nni_mtx_unlock(&ppipe->mtx);
-
- // If we are done with the pipe, let the system know so it can
- // deregister it.
- if (refcnt == 0) {
- nni_pipe_remove(ppipe->npipe);
- }
}
@@ -233,7 +209,7 @@ nni_bus_pipe_getq_cb(void *arg)
if (nni_aio_result(&ppipe->aio_getq) != 0) {
// closed?
- nni_bus_pipe_stop(ppipe);
+ nni_pipe_stop(ppipe->npipe);
return;
}
ppipe->aio_send.a_msg = ppipe->aio_getq.a_msg;
@@ -252,7 +228,7 @@ nni_bus_pipe_send_cb(void *arg)
// closed?
nni_msg_free(ppipe->aio_send.a_msg);
ppipe->aio_send.a_msg = NULL;
- nni_bus_pipe_stop(ppipe);
+ nni_pipe_stop(ppipe->npipe);
return;
}
@@ -269,7 +245,7 @@ nni_bus_pipe_recv_cb(void *arg)
uint32_t id;
if (nni_aio_result(&ppipe->aio_recv) != 0) {
- nni_bus_pipe_stop(ppipe);
+ nni_pipe_stop(ppipe->npipe);
return;
}
msg = ppipe->aio_recv.a_msg;
@@ -278,7 +254,7 @@ nni_bus_pipe_recv_cb(void *arg)
if (nni_msg_prepend_header(msg, &id, 4) != 0) {
// XXX: bump a nomemory stat
nni_msg_free(msg);
- nni_bus_pipe_stop(ppipe);
+ nni_pipe_stop(ppipe->npipe);
return;
}
@@ -295,7 +271,7 @@ nni_bus_pipe_putq_cb(void *arg)
if (nni_aio_result(&ppipe->aio_putq) != 0) {
nni_msg_free(ppipe->aio_putq.a_msg);
ppipe->aio_putq.a_msg = NULL;
- nni_bus_pipe_stop(ppipe);
+ nni_pipe_stop(ppipe->npipe);
return;
}
@@ -417,6 +393,7 @@ static nni_proto_pipe_ops nni_bus_pipe_ops = {
.pipe_init = nni_bus_pipe_init,
.pipe_fini = nni_bus_pipe_fini,
.pipe_start = nni_bus_pipe_start,
+ .pipe_stop = nni_bus_pipe_stop,
};
static nni_proto_sock_ops nni_bus_sock_ops = {