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The steps to test the problem
1. Open TCP Server
2. Open TCP Client
3. TCP Client sends data to Server.
4. Close TCP Server and the client also crash without any notification

Second wonderful...

1. There are a lot of client connections, normally, 70-80ms may have a new client connection comes.

$ ulimit -aS
time(seconds) unlimited
file(blocks) unlimited
data(kb) ...

Finally, I found the problem, it is caused by use of select().
And the error message is "too many open file descriptors"; Besides, I used "netstat -an" to check the network status, I saw a lot of...

Yes, I may looking at a wrong place... I will try it again now.

But signal = SIGABRT (6), how can I mask this signal within a thread?

So that means using -O3 in multi-threading is a bad idea?

Thanks, I will use fprintf to catch the pointer value.

Before I post the problem on the forum, I tried to use

void *value=(void *)42;
int ivalue=(int)(value);

But the problem still...

Thanks. I try it now. However, I can run the program under the text mode only since our system doesn't have a GUI. Is valgrind able to work in text mode?

The creation of thread.

void Client_Constructor ( const char* IPAddr ) {
pthread_t tid;
pthread_attr_t rx;

/* Create separate memory for client argument */
struct...

Hi, when I write the pthread_create() and pthread_join in this way, then the program is OK.


pthread_create( ... ) <- Thread A
pthread_create( ... ) <- Thread B

pthread_join( ... ) <- Thread...

In my program, threads may be created when some events trigger. So I can't create threads on initialization.

Theremore,I write a createThread() function to create thread. However, it is blocking...

Hi, I hope the TCP server never stop or exit anytime. In the original one, the TCP server exits once any read error occur, it is horrible since clients may hung up during the transmission and it is...

Hi, I am a newbie about network programming. All codes come from this book: UNIX Network Programming Volume 1, Third Edition.

It is a TCP server by use select()

int main(int argc, char...

Hi,

I have a program which needs to connect multiple servers at the same time. The program has to collect data from each of servers and then make a decision regarding to the data received.
...

Hi,

I have a UDP server and client program, and they must run within a program, so I decided two threads, one for UDP server and another for UDP client.

The simple architecture is shown in...

I create a program that need a timeout on both send() and recv() function, but I found that SO_SNDTIMEO doesn't work but SO_RCVTIMEO works!!


int sock;
int bytesRcvd,...

If the problem does not related with the listen(), it may be an interesting thing.

I sent 1024 packets to the server (a PC has both sender and receiver, that means, it send packets to itself)....

I have upload the source code I run it on Ubuntu!

Hi,

from the manual
listen(2): listen for connections on socket - Linux man page (http://linux.die.net/man/2/listen)

It has a parameter called backlog and it limits the maximum length of...

Thanks, I will try it today.

I try to initial a UDP client from threading, but it doesn't work? why?


These codes from the textbook

#define ECHOMAX 255 /* Longest string to echo */
#define TIMEOUT_SECS 2 ...

Hi, I am using TCP socket now, I don't understand what is 'a late resend for end of file is received'? Would you please describe it in detail?

My program has two threads, one is for sender and another one is receiver,



The receiver loop forever and accept and receive data from sender.
The sender may send message if necessary...

I am using Lamport's bakery algorithm to control all threads since I need no starvation.

---------- Post updated at 10:13 AM ---------- Previous update was at 10:00 AM ----------



Hi,
I...

The real problem like this,
My program has about 10-15 threads, they do not run at the same time, depending on what service is triggered, and then each thread may maintain 5-6 shared variables;...

If I have many shared variables (more than 100), what is the better solution?