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zero-copy message receive

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Construct messages from a reference-counted buffer allocated once
per receive instead of copying the data.
This commit is contained in:
Jens Auer
2015-05-29 23:54:43 +02:00
parent 611e96c701
commit e9b403a7b1
6 changed files with 273 additions and 67 deletions
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11
src/v1_decoder.cpp
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@@ -43,7 +43,8 @@
#include "err.hpp"
zmq::v1_decoder_t::v1_decoder_t (size_t bufsize_, int64_t maxmsgsize_) :
decoder_base_t <v1_decoder_t> (bufsize_),
c_single_allocator(bufsize_),
decoder_base_t <v1_decoder_t> (this),
maxmsgsize (maxmsgsize_)
{
int rc = in_progress.init ();
@@ -59,7 +60,7 @@ zmq::v1_decoder_t::~v1_decoder_t ()
errno_assert (rc == 0);
}
int zmq::v1_decoder_t::one_byte_size_ready ()
int zmq::v1_decoder_t::one_byte_size_ready (unsigned char const*)
{
// First byte of size is read. If it is 0xff read 8-byte size.
// Otherwise allocate the buffer for message data and read the
@@ -96,7 +97,7 @@ int zmq::v1_decoder_t::one_byte_size_ready ()
return 0;
}
int zmq::v1_decoder_t::eight_byte_size_ready ()
int zmq::v1_decoder_t::eight_byte_size_ready (unsigned char const*)
{
// 8-byte payload length is read. Allocate the buffer
// for message body and read the message data into it.
@@ -138,7 +139,7 @@ int zmq::v1_decoder_t::eight_byte_size_ready ()
return 0;
}
int zmq::v1_decoder_t::flags_ready ()
int zmq::v1_decoder_t::flags_ready (unsigned char const*)
{
// Store the flags from the wire into the message structure.
in_progress.set_flags (tmpbuf [0] & msg_t::more);
@@ -149,7 +150,7 @@ int zmq::v1_decoder_t::flags_ready ()
return 0;
}
int zmq::v1_decoder_t::message_ready ()
int zmq::v1_decoder_t::message_ready (unsigned char const*)
{
// Message is completely read. Push it further and start reading
// new message. (in_progress is a 0-byte message after this point.)