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authorGarrett D'Amore <garrett@damore.org>2017-03-10 15:08:40 -0800
committerGarrett D'Amore <garrett@damore.org>2017-03-10 15:08:40 -0800
commit046e60ceacd0219116d52d21352e14006ea254b0 (patch)
tree8a99c4ccc1b88c109211cde2bc99b018f5fad962 /src/protocol/pipeline
parentc50007e2ea5130c88aa27ed1c6d2cbcc4cd70f9b (diff)
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Pipeline is now race free (and simpler to boot!)
Diffstat (limited to 'src/protocol/pipeline')
-rw-r--r--src/protocol/pipeline/pull.c6
-rw-r--r--src/protocol/pipeline/push.c144
2 files changed, 33 insertions, 117 deletions
diff --git a/src/protocol/pipeline/pull.c b/src/protocol/pipeline/pull.c
index ec66fab6..622bd958 100644
--- a/src/protocol/pipeline/pull.c
+++ b/src/protocol/pipeline/pull.c
@@ -107,6 +107,7 @@ nni_pull_pipe_start(void *arg)
nni_pull_pipe *pp = arg;
// Start the pending pull...
+ nni_pipe_incref(pp->pipe);
nni_pull_recv(pp);
return (0);
@@ -133,6 +134,7 @@ nni_pull_recv_cb(void *arg)
if (nni_aio_result(aio) != 0) {
// Failed to get a message, probably the pipe is closed.
nni_pipe_close(pp->pipe);
+ nni_pipe_decref(pp->pipe);
return;
}
@@ -153,7 +155,10 @@ nni_pull_putq_cb(void *arg)
if (nni_aio_result(aio) != 0) {
// If we failed to put, probably NNG_ECLOSED, nothing else
// we can do. Just close the pipe.
+ nni_msg_free(aio->a_msg);
+ aio->a_msg = NULL;
nni_pipe_close(pp->pipe);
+ nni_pipe_decref(pp->pipe);
return;
}
@@ -168,6 +173,7 @@ nni_pull_recv(nni_pull_pipe *pp)
// Schedule the aio with callback.
if (nni_pipe_aio_recv(pp->pipe, &pp->recv_aio) != 0) {
nni_pipe_close(pp->pipe);
+ nni_pipe_decref(pp->pipe);
}
}
diff --git a/src/protocol/pipeline/push.c b/src/protocol/pipeline/push.c
index 16156ee4..d2d8363a 100644
--- a/src/protocol/pipeline/push.c
+++ b/src/protocol/pipeline/push.c
@@ -22,31 +22,23 @@ typedef struct nni_push_sock nni_push_sock;
static void nni_push_send_cb(void *);
static void nni_push_recv_cb(void *);
static void nni_push_getq_cb(void *);
-static void nni_push_recv(nni_push_pipe *);
-static void nni_push_send(nni_push_sock *);
// An nni_push_sock is our per-socket protocol private structure.
struct nni_push_sock {
nni_msgq * uwq;
- nni_msg * msg; // pending message
int raw;
- nni_list pipes;
- nni_push_pipe * nextpipe;
- int npipes;
nni_sock * sock;
-
- nni_aio aio_getq;
};
// An nni_push_pipe is our per-pipe protocol private structure.
struct nni_push_pipe {
nni_pipe * pipe;
nni_push_sock * push;
- int wantr;
nni_list_node node;
nni_aio aio_recv;
nni_aio aio_send;
+ nni_aio aio_getq;
};
static int
@@ -58,14 +50,7 @@ nni_push_sock_init(void **pushp, nni_sock *sock)
if ((push = NNI_ALLOC_STRUCT(push)) == NULL) {
return (NNG_ENOMEM);
}
- if ((rv = nni_aio_init(&push->aio_getq, nni_push_getq_cb, push)) != 0) {
- NNI_FREE_STRUCT(push);
- return (rv);
- }
- NNI_LIST_INIT(&push->pipes, nni_push_pipe, node);
push->raw = 0;
- push->npipes = 0;
- push->nextpipe = NULL;
push->sock = sock;
push->uwq = nni_sock_sendq(sock);
*pushp = push;
@@ -75,32 +60,11 @@ nni_push_sock_init(void **pushp, nni_sock *sock)
static void
-nni_push_sock_open(void *arg)
-{
- nni_push_sock *push = arg;
-
- nni_msgq_aio_get(push->uwq, &push->aio_getq);
-}
-
-
-static void
-nni_push_sock_close(void *arg)
-{
- nni_push_sock *push = arg;
-
- nni_msgq_aio_cancel(push->uwq, &push->aio_getq);
-}
-
-
-static void
nni_push_sock_fini(void *arg)
{
nni_push_sock *push = arg;
if (push != NULL) {
- if (push->msg != NULL) {
- nni_msg_free(push->msg);
- }
NNI_FREE_STRUCT(push);
}
}
@@ -124,10 +88,16 @@ nni_push_pipe_init(void **ppp, nni_pipe *pipe, void *psock)
NNI_FREE_STRUCT(pp);
return (rv);
}
+ if ((rv = nni_aio_init(&pp->aio_getq, nni_push_getq_cb, pp)) != 0) {
+ nni_aio_fini(&pp->aio_send);
+ nni_aio_fini(&pp->aio_recv);
+ NNI_FREE_STRUCT(pp);
+ return (rv);
+ }
+
NNI_LIST_NODE_INIT(&pp->node);
pp->pipe = pipe;
pp->push = psock;
- pp->wantr = 0;
*ppp = pp;
return (0);
}
@@ -138,11 +108,10 @@ nni_push_pipe_fini(void *arg)
{
nni_push_pipe *pp = arg;
- if (pp != NULL) {
- nni_aio_fini(&pp->aio_recv);
- nni_aio_fini(&pp->aio_send);
- NNI_FREE_STRUCT(pp);
- }
+ nni_aio_fini(&pp->aio_recv);
+ nni_aio_fini(&pp->aio_send);
+ nni_aio_fini(&pp->aio_getq);
+ NNI_FREE_STRUCT(pp);
}
@@ -155,22 +124,15 @@ nni_push_pipe_add(void *arg)
if (nni_pipe_peer(pp->pipe) != NNG_PROTO_PULL) {
return (NNG_EPROTO);
}
- // Turns out it should not really matter where we stick this.
- // The end makes our test cases easier.
- nni_list_append(&push->pipes, pp);
-
- // We start out wanting data to read.
- pp->wantr = 1;
-
- // Wake the top sender, as we can accept a job.
- push->npipes++;
// Schedule a receiver. This is mostly so that we can detect
// a closed transport pipe.
+ nni_pipe_incref(pp->pipe);
nni_pipe_aio_recv(pp->pipe, &pp->aio_recv);
- // Possibly schedule the sender.
- nni_push_send(pp->push);
+ // Schedule a sender.
+ nni_pipe_incref(pp->pipe);
+ nni_msgq_aio_get(push->uwq, &pp->aio_getq);
return (0);
}
@@ -182,18 +144,7 @@ nni_push_pipe_rem(void *arg)
nni_push_pipe *pp = arg;
nni_push_sock *push = pp->push;
- if (pp == push->nextpipe) {
- push->nextpipe = nni_list_next(&push->pipes, pp);
- }
- push->npipes--;
- nni_list_remove(&push->pipes, pp);
-}
-
-
-static void
-nni_push_recv(nni_push_pipe *pp)
-{
- nni_pipe_aio_recv(pp->pipe, &pp->aio_recv);
+ nni_msgq_aio_cancel(push->uwq, &pp->aio_getq);
}
@@ -206,11 +157,12 @@ nni_push_recv_cb(void *arg)
// sends us data, we just discard it.
if (nni_aio_result(&pp->aio_recv) != 0) {
nni_pipe_close(pp->pipe);
+ nni_pipe_decref(pp->pipe);
return;
}
nni_msg_free(pp->aio_recv.a_msg);
pp->aio_recv.a_msg = NULL;
- nni_push_recv(pp);
+ nni_pipe_aio_recv(pp->pipe, &pp->aio_recv);
}
@@ -219,42 +171,36 @@ nni_push_send_cb(void *arg)
{
nni_push_pipe *pp = arg;
nni_push_sock *push = pp->push;
- nni_mtx *mx = nni_sock_mtx(push->sock);
if (nni_aio_result(&pp->aio_send) != 0) {
nni_msg_free(pp->aio_send.a_msg);
pp->aio_send.a_msg = NULL;
nni_pipe_close(pp->pipe);
+ nni_pipe_decref(pp->pipe);
return;
}
- nni_mtx_lock(mx);
- pp->wantr = 1;
-
- // This effectively kicks off a pull down.
- nni_push_send(pp->push);
- nni_mtx_unlock(mx);
+ nni_msgq_aio_get(push->uwq, &pp->aio_getq);
}
static void
nni_push_getq_cb(void *arg)
{
- nni_push_sock *push = arg;
- nni_mtx *mx = nni_sock_mtx(push->sock);
- nni_aio *aio = &push->aio_getq;
+ nni_push_pipe *pp = arg;
+ nni_aio *aio = &pp->aio_getq;
if (nni_aio_result(aio) != 0) {
// If the socket is closing, nothing else we can do.
+ nni_pipe_close(pp->pipe);
+ nni_pipe_decref(pp->pipe);
return;
}
- nni_mtx_lock(mx);
- push->msg = aio->a_msg;
+ pp->aio_send.a_msg = aio->a_msg;
aio->a_msg = NULL;
- nni_push_send(push);
- nni_mtx_unlock(mx);
+ nni_pipe_aio_send(pp->pipe, &pp->aio_send);
}
@@ -292,40 +238,6 @@ nni_push_sock_getopt(void *arg, int opt, void *buf, size_t *szp)
}
-static void
-nni_push_send(nni_push_sock *push)
-{
- nni_push_pipe *pp;
- nni_msg *msg = NULL;
- int i;
-
- if ((msg = push->msg) == NULL) {
- // Nothing to send... bail...
- return;
- }
-
- // Let's try to send it.
- for (i = 0; i < push->npipes; i++) {
- pp = push->nextpipe;
- if (pp == NULL) {
- pp = nni_list_first(&push->pipes);
- }
- push->nextpipe = nni_list_next(&push->pipes, pp);
- if (pp->wantr) {
- pp->aio_send.a_msg = msg;
- push->msg = NULL;
-
- // Schedule outbound pipe delivery...
- nni_pipe_aio_send(pp->pipe, &pp->aio_send);
-
- // And schedule getting another message for send.
- nni_msgq_aio_get(push->uwq, &push->aio_getq);
- break;
- }
- }
-}
-
-
// This is the global protocol structure -- our linkage to the core.
// This should be the only global non-static symbol in this file.
static nni_proto_pipe_ops nni_push_pipe_ops = {
@@ -338,8 +250,6 @@ static nni_proto_pipe_ops nni_push_pipe_ops = {
static nni_proto_sock_ops nni_push_sock_ops = {
.sock_init = nni_push_sock_init,
.sock_fini = nni_push_sock_fini,
- .sock_open = nni_push_sock_open,
- .sock_close = nni_push_sock_close,
.sock_setopt = nni_push_sock_setopt,
.sock_getopt = nni_push_sock_getopt,
};