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LABEL flag added to the wire format

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So far there was no distinction between message parts used by 0MQ
and message parts used by user. Now, the message parts used by 0MQ
are marked as 'LABEL'.

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
This commit is contained in:
Martin Sustrik 2011-06-20 11:33:54 +02:00
parent ada5d42472
commit ab99975ad4
17 changed files with 80 additions and 33 deletions
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12
doc/zmq_getsockopt.txt
View File

@ -57,6 +57,18 @@ Default value:: N/A
Applicable socket types:: all
ZMQ_RCVLABEL: Inquires whether last message received was a label
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The 'ZMQ_RCVLABEL' option shall return a boolean value indicating whether the
last message part received was a label. Labels are used internally by 0MQ.
[horizontal]
Option value type:: int
Option value unit:: boolean
Default value:: N/A
Applicable socket types:: all
ZMQ_SNDHWM: Set high water mark for outbound messages
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The 'ZMQ_SNDHWM' option shall set the high water mark for outbound messages on

4
doc/zmq_send.txt
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@ -28,6 +28,10 @@ Specifies that the message being sent is a multi-part message, and that further
message parts are to follow. Refer to the section regarding multi-part messages
below for a detailed description.
*ZMQ_SNDLABEL*::
Specifies that the message being sent is a label. Labels are used internally
by 0MQ.
The _zmq_msg_t_ structure passed to _zmq_send()_ is nullified during the call.
If you want to send the same message to multiple sockets you have to copy it
using (e.g. using _zmq_msg_copy()_).

2
include/zmq.h
View File

@ -183,10 +183,12 @@ ZMQ_EXPORT int zmq_term (void *context);
#define ZMQ_FILTER 26
#define ZMQ_RCVTIMEO 27
#define ZMQ_SNDTIMEO 28
#define ZMQ_RCVLABEL 29
/* Send/recv options. */
#define ZMQ_DONTWAIT 1
#define ZMQ_SNDMORE 2
#define ZMQ_SNDLABEL 4
ZMQ_EXPORT void *zmq_socket (void *context, int type);
ZMQ_EXPORT int zmq_close (void *s);

4
src/dist.cpp
View File

@ -111,7 +111,7 @@ int zmq::dist_t::send_to_all (msg_t *msg_, int flags_)
int zmq::dist_t::send_to_matching (msg_t *msg_, int flags_)
{
// Is this end of a multipart message?
bool msg_more = msg_->flags () & msg_t::more;
bool msg_more = msg_->flags () & (msg_t::more | msg_t::label);
// Push the message to matching pipes.
distribute (msg_, flags_);
@ -170,7 +170,7 @@ bool zmq::dist_t::write (pipe_t *pipe_, msg_t *msg_)
eligible--;
return false;
}
if (!(msg_->flags () & msg_t::more))
if (!(msg_->flags () & (msg_t::more | msg_t::label)))
pipe_->flush ();
return true;
}

4
src/encoder.cpp
View File

@ -81,14 +81,14 @@ bool zmq::encoder_t::message_ready ()
tmpbuf [0] = (unsigned char) size;
tmpbuf [1] = (in_progress.flags () & ~msg_t::shared);
next_step (tmpbuf, 2, &encoder_t::size_ready,
!(in_progress.flags () & msg_t::more));
!(in_progress.flags () & (msg_t::more | msg_t::label)));
}
else {
tmpbuf [0] = 0xff;
put_uint64 (tmpbuf + 1, size);
tmpbuf [9] = (in_progress.flags () & ~msg_t::shared);
next_step (tmpbuf, 10, &encoder_t::size_ready,
!(in_progress.flags () & msg_t::more));
!(in_progress.flags () & (msg_t::more | msg_t::label)));
}
return true;
}

2
src/fq.cpp
View File

@ -90,7 +90,7 @@ int zmq::fq_t::recvpipe (msg_t *msg_, int flags_, pipe_t **pipe_)
if (fetched) {
if (pipe_)
*pipe_ = pipes [current];
more = msg_->flags () & msg_t::more;
more = msg_->flags () & (msg_t::more | msg_t::label);
if (!more) {
current++;
if (current >= active)

4
src/lb.cpp
View File

@ -75,7 +75,7 @@ int zmq::lb_t::send (msg_t *msg_, int flags_)
// switch back to non-dropping mode.
if (dropping) {
more = msg_->flags () & msg_t::more;
more = msg_->flags () & (msg_t::more | msg_t::label);
if (!more)
dropping = false;
@ -88,7 +88,7 @@ int zmq::lb_t::send (msg_t *msg_, int flags_)
while (active > 0) {
if (pipes [current]->write (msg_)) {
more = msg_->flags () & msg_t::more;
more = msg_->flags () & (msg_t::more | msg_t::label);
break;
}

5
src/msg.hpp
View File

@ -47,8 +47,9 @@ namespace zmq
// Mesage flags.
enum
{
more = 1,
shared = 128
label = 1,
shared = 64,
more = 128
};
bool check ();

9
src/pipe.cpp
View File

@ -125,7 +125,7 @@ bool zmq::pipe_t::read (msg_t *msg_)
return false;
}
if (!(msg_->flags () & msg_t::more))
if (!(msg_->flags () & (msg_t::more | msg_t::label)))
msgs_read++;
if (lwm > 0 && msgs_read % lwm == 0)
@ -154,8 +154,9 @@ bool zmq::pipe_t::write (msg_t *msg_)
if (unlikely (!check_write (msg_)))
return false;
outpipe->write (*msg_, msg_->flags () & msg_t::more);
if (!(msg_->flags () & msg_t::more))
bool more = msg_->flags () & (msg_t::more | msg_t::label);
outpipe->write (*msg_, more);
if (!more)
msgs_written++;
return true;
@ -167,7 +168,7 @@ void zmq::pipe_t::rollback ()
msg_t msg;
if (outpipe) {
while (outpipe->unwrite (&msg)) {
zmq_assert (msg.flags () & msg_t::more);
zmq_assert (msg.flags () & (msg_t::more | msg_t::label));
int rc = msg.close ();
errno_assert (rc == 0);
}

6
src/rep.cpp
View File

@ -42,7 +42,7 @@ int zmq::rep_t::xsend (msg_t *msg_, int flags_)
return -1;
}
bool more = (msg_->flags () & msg_t::more);
bool more = msg_->flags () & (msg_t::more | msg_t::label);
// Push message to the reply pipe.
int rc = xrep_t::xsend (msg_, flags_);
@ -77,7 +77,7 @@ int zmq::rep_t::xrecv (msg_t *msg_, int flags_)
if (rc != 0)
return rc;
if (msg_->flags () & msg_t::more) {
if (msg_->flags () & (msg_t::more | msg_t::label)) {
// Empty message part delimits the traceback stack.
bool bottom = (msg_->size () == 0);
@ -111,7 +111,7 @@ int zmq::rep_t::xrecv (msg_t *msg_, int flags_)
return rc;
// If whole request is read, flip the FSM to reply-sending state.
if (!(msg_->flags () & msg_t::more)) {
if (!(msg_->flags () & (msg_t::more | msg_t::label))) {
sending_reply = true;
request_begins = true;
}

8
src/req.cpp
View File

@ -48,14 +48,14 @@ int zmq::req_t::xsend (msg_t *msg_, int flags_)
msg_t prefix;
int rc = prefix.init ();
errno_assert (rc == 0);
prefix.set_flags (msg_t::more);
prefix.set_flags (msg_t::label);
rc = xreq_t::xsend (&prefix, flags_);
if (rc != 0)
return rc;
message_begins = false;
}
bool more = msg_->flags () & msg_t::more;
bool more = msg_->flags () & (msg_t::more | msg_t::label);
int rc = xreq_t::xsend (msg_, flags_);
if (rc != 0)
@ -83,7 +83,7 @@ int zmq::req_t::xrecv (msg_t *msg_, int flags_)
int rc = xreq_t::xrecv (msg_, flags_);
if (rc != 0)
return rc;
zmq_assert (msg_->flags () & msg_t::more);
zmq_assert (msg_->flags () & msg_t::label);
zmq_assert (msg_->size () == 0);
message_begins = false;
}
@ -93,7 +93,7 @@ int zmq::req_t::xrecv (msg_t *msg_, int flags_)
return rc;
// If the reply is fully received, flip the FSM into request-sending state.
if (!(msg_->flags () & msg_t::more)) {
if (!(msg_->flags () & (msg_t::more | msg_t::label))) {
receiving_reply = false;
message_begins = true;
}

2
src/session.cpp
View File

@ -71,7 +71,7 @@ bool zmq::session_t::read (msg_t *msg_)
if (!pipe->read (msg_))
return false;
incomplete_in = msg_->flags () & msg_t::more;
incomplete_in = msg_->flags () & (msg_t::more | msg_t::label);
return true;
}

25
src/socket_base.cpp
View File

@ -119,6 +119,7 @@ zmq::socket_base_t::socket_base_t (ctx_t *parent_, uint32_t tid_) :
destroyed (false),
last_tsc (0),
ticks (0),
rcvlabel (false),
rcvmore (false)
{
}
@ -263,6 +264,16 @@ int zmq::socket_base_t::getsockopt (int option_, void *optval_,
return -1;
}
if (option_ == ZMQ_RCVLABEL) {
if (*optvallen_ < sizeof (int)) {
errno = EINVAL;
return -1;
}
*((int*) optval_) = rcvlabel ? 1 : 0;
*optvallen_ = sizeof (int);
return 0;
}
if (option_ == ZMQ_RCVMORE) {
if (*optvallen_ < sizeof (int)) {
errno = EINVAL;
@ -479,7 +490,9 @@ int zmq::socket_base_t::send (msg_t *msg_, int flags_)
if (unlikely (rc != 0))
return -1;
// At this point we impose the MORE flag on the message.
// At this point we impose the LABEL & MORE flags on the message.
if (flags_ & ZMQ_SNDLABEL)
msg_->set_flags (msg_t::label);
if (flags_ & ZMQ_SNDMORE)
msg_->set_flags (msg_t::more);
@ -558,6 +571,9 @@ int zmq::socket_base_t::recv (msg_t *msg_, int flags_)
// If we have the message, return immediately.
if (rc == 0) {
rcvlabel = msg_->flags () & msg_t::label;
if (rcvlabel)
msg_->reset_flags (msg_t::label);
rcvmore = msg_->flags () & msg_t::more;
if (rcvmore)
msg_->reset_flags (msg_t::more);
@ -575,6 +591,9 @@ int zmq::socket_base_t::recv (msg_t *msg_, int flags_)
rc = xrecv (msg_, flags_);
if (rc == 0) {
rcvlabel = msg_->flags () & msg_t::label;
if (rcvlabel)
msg_->reset_flags (msg_t::label);
rcvmore = msg_->flags () & msg_t::more;
if (rcvmore)
msg_->reset_flags (msg_t::more);
@ -611,6 +630,10 @@ int zmq::socket_base_t::recv (msg_t *msg_, int flags_)
}
}
// Extract LABEL & MORE flags from the message.
rcvlabel = msg_->flags () & msg_t::label;
if (rcvlabel)
msg_->reset_flags (msg_t::label);
rcvmore = msg_->flags () & msg_t::more;
if (rcvmore)
msg_->reset_flags (msg_t::more);

5
src/socket_base.hpp
View File

@ -189,7 +189,10 @@ namespace zmq
// Number of messages received since last command processing.
int ticks;
// If true there's a half-read message in the socket.
// True if the last message received had LABEL flag set.
bool rcvlabel;
// True if the last message received had MORE flag set.
bool rcvmore;
// Lists of existing sessions. This list is never referenced from

2
src/xpub.cpp
View File

@ -100,7 +100,7 @@ void zmq::xpub_t::mark_as_matching (pipe_t *pipe_, void *arg_)
int zmq::xpub_t::xsend (msg_t *msg_, int flags_)
{
bool msg_more = msg_->flags () & msg_t::more;
bool msg_more = msg_->flags () & (msg_t::more | msg_t::label);
// For the first part of multi-part message, find the matching pipes.
if (!more)

11
src/xrep.cpp
View File

@ -122,7 +122,8 @@ int zmq::xrep_t::xsend (msg_t *msg_, int flags_)
// If we have malformed message (prefix with no subsequent message)
// then just silently ignore it.
if (msg_->flags () & msg_t::more) {
// TODO: The connections should be killed instead.
if (msg_->flags () & msg_t::label) {
more_out = true;
@ -158,7 +159,7 @@ int zmq::xrep_t::xsend (msg_t *msg_, int flags_)
}
// Check whether this is the last part of the message.
more_out = msg_->flags () & msg_t::more;
more_out = msg_->flags () & (msg_t::more | msg_t::label);
// Push the message into the pipe. If there's no out pipe, just drop it.
if (current_out) {
@ -187,7 +188,7 @@ int zmq::xrep_t::xrecv (msg_t *msg_, int flags_)
if (prefetched) {
int rc = msg_->move (prefetched_msg);
errno_assert (rc == 0);
more_in = msg_->flags () & msg_t::more;
more_in = msg_->flags () & (msg_t::more | msg_t::label);
prefetched = false;
return 0;
}
@ -201,7 +202,7 @@ int zmq::xrep_t::xrecv (msg_t *msg_, int flags_)
zmq_assert (inpipes [current_in].active);
bool fetched = inpipes [current_in].pipe->read (msg_);
zmq_assert (fetched);
more_in = msg_->flags () & msg_t::more;
more_in = msg_->flags () & (msg_t::more | msg_t::label);
if (!more_in) {
current_in++;
if (current_in >= inpipes.size ())
@ -223,7 +224,7 @@ int zmq::xrep_t::xrecv (msg_t *msg_, int flags_)
errno_assert (rc == 0);
memcpy (msg_->data (), inpipes [current_in].identity.data (),
msg_->size ());
msg_->set_flags (msg_t::more);
msg_->set_flags (msg_t::label);
return 0;
}

8
src/xsub.cpp
View File

@ -116,7 +116,7 @@ int zmq::xsub_t::xrecv (msg_t *msg_, int flags_)
int rc = msg_->move (message);
errno_assert (rc == 0);
has_message = false;
more = msg_->flags () & msg_t::more;
more = msg_->flags () & (msg_t::more | msg_t::label);
return 0;
}
@ -136,13 +136,13 @@ int zmq::xsub_t::xrecv (msg_t *msg_, int flags_)
// Check whether the message matches at least one subscription.
// Non-initial parts of the message are passed
if (more || !options.filter || match (msg_)) {
more = msg_->flags () & msg_t::more;
more = msg_->flags () & (msg_t::more | msg_t::label);
return 0;
}
// Message doesn't match. Pop any remaining parts of the message
// from the pipe.
while (msg_->flags () & msg_t::more) {
while (msg_->flags () & (msg_t::more | msg_t::label)) {
rc = fq.recv (msg_, ZMQ_DONTWAIT);
zmq_assert (rc == 0);
}
@ -182,7 +182,7 @@ bool zmq::xsub_t::xhas_in ()
// Message doesn't match. Pop any remaining parts of the message
// from the pipe.
while (message.flags () & msg_t::more) {
while (message.flags () & (msg_t::more | msg_t::label)) {
rc = fq.recv (&message, ZMQ_DONTWAIT);
zmq_assert (rc == 0);
}