On Tue, 22 Oct 2019, 07:05 Saravanan A via Boost, <boost@lists.boost.org> wrote:

Hi Team,

We Currently trying to develop a prototype with boost libraries, where we are facing an issue in it with boost library. It would be great if someone help out here .

we are having two process where one process create “*managed xsi shared memory”* and other get attached to it. Here we trying to have a spsc queue in a shared memory structure which will be accessed by both process . Where SPSC queue data is a user defined class object. when we have a integer in ” *Mydata”* (Class name) mentioned below and try to do a Push /pop operation in the spsc queue on respective process it was working fine without any issues. But the same framework when we have an array of greater size(more than 28 byte around. Example: a[7] ) .We are facing a crash in consumer side .

(It seems spsc queue write somewhere in process heap memory after first pop leading to memory corrupt )

please let us know if there any open issue in this ? or if we have used boost library incorrectly ? Thanks for reading. I would be thankful for any information you may have to offer.

*Backtrace:*

/data/users/kapparao/example_boost/anony-SHM-managed> $./processB

Consumer-TX - Read data from Q - [1,b]

notify_one@93 - I am here!

notify_one@159 - I am here!

Segmentation fault (core dumped)

/data/users/kapparao/example_boost/anony-SHM-managed> $gdb ./processB

GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-115.el7

Copyright (C) 2013 Free Software Foundation, Inc.

License GPLv3+: GNU GPL version 3 or later < http://gnu.org/licenses/gpl.html

...

This is free software: you are free to change and redistribute it.

There is NO WARRANTY, to the extent permitted by law. Type "show copying"

and "show warranty" for details.

This GDB was configured as "x86_64-redhat-linux-gnu".

For bug reporting instructions, please see:

<http://www.gnu.org/software/gdb/bugs/>...

Reading symbols from /data/users/kapparao/example_boost/anony-SHM-managed/processB...done.

(gdb) r

Starting program: /data/users/kapparao/example_boost/anony-SHM-managed/./processB

[Thread debugging using libthread_db enabled]

Using host libthread_db library "/lib64/libthread_db.so.1".

Consumer-TX - Read data from Q - [1,b]

Program received signal SIGSEGV, Segmentation fault.

0x00007ffff7bcb09b in pthread_cond_signal@@GLIBC_2.3.2 () from /lib64/libpthread.so.0

Missing separate debuginfos, use: debuginfo-install glibc-2.17-292.0.1.el7.x86_64 libgcc-4.8.5-39.0.1.el7.x86_64 libstdc++-4.8.5-39.0.1.el7.x86_64

(gdb) bt

#0 0x00007ffff7bcb09b in pthread_cond_signal@@GLIBC_2.3.2 () from /lib64/libpthread.so.0

#1 0x00000000004063de in boost::interprocess::ipcdetail::posix_condition::notify_one (this=0x28) at ../../boost/include/boost/interprocess/sync/posix/condition.hpp:160

#2 0x00000000004066e1 in boost::interprocess::interprocess_condition::notify_one (this=0x28) at ../../boost/include/boost/interprocess/sync/interprocess_condition.hpp:94

#3 0x0000000000402941 in main () at processB.cpp:42

Attached the complete code in tar for your reference.

*Compilation and Execution* :

*Process A : *

Compilation syntax :

c++ my_data.cc processA.cpp -I < boost_header_file_path> <boost_lib_path> -lpthread -g -o processA -std=c++11

Execution syntax :

./processA

*Process B :*

Compilation syntax :

c++ my_data.cc processB.cpp -I < boost_header_file_path> <boost_lib_path> -lpthread -g -o processB -std=c++11

Execution syntax :

./processB

*Thanks in advance !!!!

lockfree spsc does not support being mapped in two different processes at different locations. This could be implemented as an extension. Also you're using locks with a lockfree queue, that makes no sense at all. Either use a normal queue with locks or don't use locks.