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Yes, you should use mutex. volatile alone (along with atomic operation) is not enough to guarantee correctness in multi-threaded program. The magic word here is: memory visibility. Interested readers...

Hi Luke,


I didn't spend much time with your program, but it occured to me that these lines look rather suspicious:

for( i = u; i < G->nv; i++ )
if( i + 1 < G->nv ) G->adj[i] =...

Something around those lines:

#!/usr/bin/env python
import os

# assume we got the list from somewhere
list = ["apple", "oranges", "pears", "grapes"]

for fruit in list:
...

Any reason for not using standard blocking mode?



I can't quite follow. If only 1080 has been sent, I don't think that read() returns 2464 bytes...


You need to handle partial read anyway...

Your client should select the socket for read events.
- as soon as the answer from the server is received, select shall return and you may further process, or
- select shall block until the...

I'm glad that I won't end-up maintaining your code...

I played with it a bit, took me some time to get the client working without crash:

- A Pthread_attr_init is missing for rx (Client.c:218)...

I guess, my previous example shows how to do it:
- it creates an empty map
- it fills the map step by step as the number are entered (until a negative number is given for stop).
- for the entered...

Are you working on Linux? If so, can you run your program under valgrind supervision?

Glad that you solve the problem ;-) Sometimes, it's better to (re)start from scratch...

Cheers, Loïc

Just fun for, you may want to create the dhcp3 directory (with appropriate access right) under /usr/local/var/lib/dhcp3/ and check if that's do it.
drwxr-xr-x 2 root root 12288...

AFAICS, dhcp seems to work as you obtain the IP address 10.70.29.178 from our server 10.70.31.252.

I am a bit surprised however that - once NetworkManager obtains the IP - it does not continue...

Any suspicious entries in dmesg, /var/log/messages or /var/log/daemon.log?

I answered your question previously:
- the value at the memory location gets changed.
- when the compiler sees the variable "i", it replaces it directly by "10" (it's OK to do so, since it is a...

Every thread has its own stack. Hence, in your example, i and j would be hence "private to the threads" and thus their local variables "would not conflict".

Of course, if another thread happens to...

Good Evening,



Let's go to the core question as it's near bed time ;)

From a pure POSIX standpoint, if we want to get the "parent thread id" (the term "parent thread" is BTW is misnomer...

Good evening,


Theoretically, there is no any life time period imposed on a created thread. Practically, the performance may degrade over the time or your process terminates because of...

I should probably devote some times and write a nice article about it on my blog. But, as you surely know, time is a scare resource... so I will merely copy-paste the most important point of a...

Try
ps -fp 17970
( this assumes that your 'perl' process that hogs the CPU is 17970 as given in your example). You should then find out the guilty script.

Loïc

Because browser are not reputedly secure, that is subject to exploits. If your browser runs with root privileges, then the exploit can easily gain control over the machine where the browser runs. (...

The original APUE from Steven's has been reworked by Rago, which gave birth the APUE 2nd edition, see APUE2e (http://www.apuebook.com/). This book is good, no point.

The most recent and...

Does the same behavior occur if you're browsing as a regular user? Running a browser with root privileges might not be the best idea, BTW.

Cheers.
Loïc.

I don't know if that could help:


Cheers,
Loïc

Dear Lixiao,

start studying and writing your 'hello world' client/server, see for instance Programming IP Sockets on Linux, Part One (http://gnosis.cx/publish/programming/sockets.html) . Then...

Two ideas that comes to my mind:

why should the runX be run with the priviledges of OtherUser. If the reason is because of files permissions, a better solution could involve putting User and...