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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/reqrep/req.c
parent10d748fa6444324878a77cc5749c93b75819ced2 (diff)
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Refactor stop again, closing numerous races (thanks valgrind!)
Diffstat (limited to 'src/protocol/reqrep/req.c')
-rw-r--r--src/protocol/reqrep/req.c44
1 files changed, 17 insertions, 27 deletions
diff --git a/src/protocol/reqrep/req.c b/src/protocol/reqrep/req.c
index 1ce1156c..c2542e18 100644
--- a/src/protocol/reqrep/req.c
+++ b/src/protocol/reqrep/req.c
@@ -57,7 +57,6 @@ struct nni_req_pipe {
nni_aio aio_sendcooked; // cooked mode only
nni_aio aio_recv;
nni_aio aio_putq;
- int refcnt;
nni_mtx mtx;
};
@@ -197,10 +196,6 @@ nni_req_pipe_start(void *arg)
return (NNG_EPROTO);
}
- nni_mtx_lock(&rp->mtx);
- rp->refcnt = 2;
- nni_mtx_unlock(&rp->mtx);
-
nni_mtx_lock(&req->mtx);
nni_list_append(&req->readypipes, rp);
if (req->wantw) {
@@ -216,19 +211,19 @@ nni_req_pipe_start(void *arg)
static void
-nni_req_pipe_stop(nni_req_pipe *rp)
+nni_req_pipe_stop(void *arg)
{
+ nni_req_pipe *rp = arg;
nni_req_sock *req = rp->req;
- int refcnt;
- nni_mtx_lock(&rp->mtx);
- NNI_ASSERT(rp->refcnt > 0);
- rp->refcnt--;
- refcnt = rp->refcnt;
- nni_mtx_unlock(&rp->mtx);
+ nni_aio_stop(&rp->aio_getq);
+ nni_aio_stop(&rp->aio_putq);
+ nni_aio_stop(&rp->aio_recv);
+ nni_aio_stop(&rp->aio_sendcooked);
+ nni_aio_stop(&rp->aio_sendraw);
- nni_msgq_aio_cancel(req->uwq, &rp->aio_getq);
- nni_msgq_aio_cancel(req->urq, &rp->aio_putq);
+ // At this point there should not be any further AIOs running.
+ // Further, any completion tasks have completed.
nni_mtx_lock(&req->mtx);
// This removes the node from either busypipes or readypipes.
@@ -245,12 +240,7 @@ nni_req_pipe_stop(nni_req_pipe *rp)
req->wantw = 1;
nni_req_resend(req);
}
-
nni_mtx_unlock(&req->mtx);
-
- if (refcnt == 0) {
- nni_pipe_remove(rp->pipe);
- }
}
@@ -323,7 +313,7 @@ nni_req_getq_cb(void *arg)
// exception: we wind up here in error state when the uwq is closed.)
if (nni_aio_result(&rp->aio_getq) != 0) {
- nni_req_pipe_stop(rp);
+ nni_pipe_stop(rp->pipe);
return;
}
@@ -344,7 +334,7 @@ nni_req_sendraw_cb(void *arg)
if (nni_aio_result(&rp->aio_sendraw) != 0) {
nni_msg_free(rp->aio_sendraw.a_msg);
rp->aio_sendraw.a_msg = NULL;
- nni_req_pipe_stop(rp);
+ nni_pipe_stop(rp->pipe);
return;
}
@@ -359,14 +349,13 @@ nni_req_sendcooked_cb(void *arg)
nni_req_pipe *rp = arg;
nni_req_sock *req = rp->req;
- NNI_ASSERT(rp->refcnt > 0);
if (nni_aio_result(&rp->aio_sendcooked) != 0) {
// We failed to send... clean up and deal with it.
// We leave ourselves on the busy list for now, which
// means no new asynchronous traffic can occur here.
nni_msg_free(rp->aio_sendcooked.a_msg);
rp->aio_sendcooked.a_msg = NULL;
- nni_req_pipe_stop(rp);
+ nni_pipe_stop(rp->pipe);
return;
}
@@ -384,7 +373,7 @@ nni_req_sendcooked_cb(void *arg)
// side while we were waiting to be scheduled to run for the
// writer side. In this case we can't complete the operation,
// and we have to abort.
- nni_req_pipe_stop(rp);
+ nni_pipe_stop(rp->pipe);
}
nni_mtx_unlock(&req->mtx);
}
@@ -397,7 +386,7 @@ nni_req_putq_cb(void *arg)
if (nni_aio_result(&rp->aio_putq) != 0) {
nni_msg_free(rp->aio_putq.a_msg);
- nni_req_pipe_stop(rp);
+ nni_pipe_stop(rp->pipe);
return;
}
rp->aio_putq.a_msg = NULL;
@@ -413,7 +402,7 @@ nni_req_recv_cb(void *arg)
nni_msg *msg;
if (nni_aio_result(&rp->aio_recv) != 0) {
- nni_req_pipe_stop(rp);
+ nni_pipe_stop(rp->pipe);
return;
}
@@ -443,7 +432,7 @@ nni_req_recv_cb(void *arg)
malformed:
nni_msg_free(msg);
- nni_req_pipe_stop(rp);
+ nni_pipe_stop(rp->pipe);
}
@@ -615,6 +604,7 @@ static nni_proto_pipe_ops nni_req_pipe_ops = {
.pipe_init = nni_req_pipe_init,
.pipe_fini = nni_req_pipe_fini,
.pipe_start = nni_req_pipe_start,
+ .pipe_stop = nni_req_pipe_stop,
};
static nni_proto_sock_ops nni_req_sock_ops = {