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https://github.com/zeromq/libzmq.git
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56ead84490
1) VSM - you cannot hand out the 'data' address as it was not allocated on the heap 2) for other messages the 'data' address cannot be handed out either, as it not the address originally returned by malloc and hence cannot be passed to 'free'. see msg.cpp u.lmsg.content = (content_t*) malloc (sizeof (content_t) + size_); .... u.lmsg.content->data = u.lmsg.content + 1; So the function is changed to always malloc a data buffer and copy the data into it. There is a possible optimisation using memmove for the non-VSM case but that is not done yet.
112 lines
2.5 KiB
C++
112 lines
2.5 KiB
C++
/*
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Copyright (c) 2007-2013 Contributors as noted in the AUTHORS file
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This file is part of 0MQ.
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0MQ is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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0MQ is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "../include/zmq.h"
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#undef NDEBUG
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#include <assert.h>
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// XSI vector I/O
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#if defined ZMQ_HAVE_UIO
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#include <sys/uio.h>
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#else
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struct iovec {
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void *iov_base;
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size_t iov_len;
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};
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#endif
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void do_check(void* sb, void* sc, unsigned int msgsz)
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{
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int rc;
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int sum =0;
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for (int i = 0; i < 10; i++)
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{
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zmq_msg_t msg;
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zmq_msg_init_size(&msg, msgsz);
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void * data = zmq_msg_data(&msg);
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memcpy(data,&i, sizeof(int));
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rc = zmq_msg_send(&msg,sc,i==9 ? 0 :ZMQ_SNDMORE);
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assert (rc == (int)msgsz);
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zmq_msg_close(&msg);
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sum += i;
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}
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struct iovec ibuffer[32] ;
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memset(&ibuffer[0], 0, sizeof(ibuffer));
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size_t count = 10;
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rc = zmq_recviov(sb,&ibuffer[0],&count,0);
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assert (rc == 10);
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int rsum=0;
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for(;count;--count)
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{
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int v;
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memcpy(&v,ibuffer[count-1].iov_base,sizeof(int));
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rsum += v;
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assert(ibuffer[count-1].iov_len == msgsz);
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// free up the memory
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free(ibuffer[count-1].iov_base);
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}
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assert ( sum == rsum );
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}
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int main (void)
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{
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void *ctx = zmq_ctx_new ();
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assert (ctx);
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int rc;
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void *sb = zmq_socket (ctx, ZMQ_PULL);
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assert (sb);
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rc = zmq_bind (sb, "inproc://a");
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assert (rc == 0);
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::sleep(1);
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void *sc = zmq_socket (ctx, ZMQ_PUSH);
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rc = zmq_connect (sc, "inproc://a");
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assert (rc == 0);
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// message bigger than vsm max
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do_check(sb,sc,100);
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// message smaller than vsm max
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do_check(sb,sc,10);
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rc = zmq_close (sc);
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assert (rc == 0);
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rc = zmq_close (sb);
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assert (rc == 0);
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rc = zmq_ctx_term (ctx);
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assert (rc == 0);
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return 0;
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}
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