Date: Mon, 9 Apr 2001 10:55:10 +0100 From: "Jim Long" <longj@OIT.EDU> To: "Brian M. King" <raider1@rochester.rr.com>, <freebsd-questions@FreeBSD.ORG> Subject: Re: C++ Message-ID: <02c201c0c0db$2cc73f00$798dd38c@oit.edu> References: <000b01c0bf22$14f70460$0d6e1842@King.rochester.rr.com>
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Are the your data structures thread safe? Dou you have good thread synch =
built in?
----- Original Message -----=20
From: Brian M. King=20
To: freebsd-questions@FreeBSD.ORG=20
Sent: Saturday, April 07, 2001 6:17 AM
Subject: C++
Hello. I am currently in the process of developing an IRCd in C++ =
on FreeBSD and while I was creating some test code I discovered a =
problem and no programmers that I know seem to have any ideas as to why =
its happening. I have the main() opening a socket for listening and =
accepting connections. I also have a threaded function (Using POSIX =
threads) that reads data from all the sockets and stores it into an STL =
Queue system. I then have several work threads running the same function =
that reads from the STL Queue list to handle the data appropriatly. In =
the first thread that reads from the sockes I am allocating the memory =
for each container element using 'char *msg =3D new char[size]' .. The =
problem I am having is in the worker threads that handle the queues I do =
a 'char *msg; msg =3D MessageQueue.front(); MessageQueue.pop(); if (msg =
!=3D NULL) { delete [] msg; }' When it tries to delete the allocated =
memory I get the error 'Junk pointer, too high to make sense.' but I've =
used this method before without a problem. I am running FreeBSD =
4.2-RELEASE and am compiling with g++ .. I am attaching the test program =
I've written to develop the STL Container system I will need in the ircd =
itself.
To compile: g++ -pthread -Wall -g -o sin sin2.cpp
To Run: ./sin
Open a socket connection to the box this program is running on on port =
1600 and send data to it, you will see the error (Which occurs in the =
queue_handler function).
-Brian
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<DIV><FONT size=3D2>Are the your data structures thread safe? Dou you =
have good=20
thread synch built in?</FONT></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Draider1@rochester.rr.com =
href=3D"mailto:raider1@rochester.rr.com">Brian=20
M. King</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A=20
title=3Dfreebsd-questions@FreeBSD.ORG=20
=
href=3D"mailto:freebsd-questions@FreeBSD.ORG">freebsd-questions@FreeBSD.O=
RG</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Saturday, April 07, 2001 =
6:17=20
AM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> C++</DIV>
<DIV><BR></DIV>
<DIV><FONT face=3DArial size=3D2> Hello. I am =
currently in the=20
process of developing an IRCd in C++ on FreeBSD and while I was =
creating some=20
test code I discovered a problem and no programmers that I know seem =
to have=20
any ideas as to why its happening. I have the main() opening a socket =
for=20
listening and accepting connections. I also have a threaded function =
(Using=20
POSIX threads) that reads data from all the sockets and stores it into =
an STL=20
Queue system. I then have several work threads running the same =
function that=20
reads from the STL Queue list to handle the data appropriatly. In the =
first=20
thread that reads from the sockes I am allocating the memory for each=20
container element using 'char *msg =3D new char[size]' .. The problem =
I am=20
having is in the worker threads that handle the queues I do a 'char =
*msg; msg=20
=3D MessageQueue.front(); MessageQueue.pop(); if (msg !=3D NULL) { =
delete [] msg;=20
}' When it tries to delete the allocated memory I get the error 'Junk =
pointer,=20
too high to make sense.' but I've used this method before without a =
problem. I=20
am running FreeBSD 4.2-RELEASE and am compiling with g++ .. I am =
attaching the=20
test program I've written to develop the STL Container system I will =
need in=20
the ircd itself.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>To compile: g++ -pthread -Wall -g -o =
sin=20
sin2.cpp</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>To Run: ./sin</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>Open a socket connection to the box =
this program=20
is running on on port 1600 and send data to it, you will see the error =
(Which=20
occurs in the queue_handler function).</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial =
size=3D2>-Brian</FONT></DIV></BLOCKQUOTE></BODY></HTML>
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