8 More Discussions You Might Find Interesting
1. Ubuntu
I wrote this kernel module to test the correctness of ndelay() function.
Kernel mdoule:
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/time.h>
#include <linux/delay.h>
static int __init initialize(void)
{
ktime_t start, end;
s64... (1 Reply)
Discussion started by: BHASKAR JUPUDI
1 Replies
2. Red Hat
Hi,
i am new to linux/RHEL 6.0 and i have two questions.
1) How to get the CPU utilization and Memory Utilization of all Services running currently?
2) How to get the CPU utilization and Memory Utilization of all Applications running currently?
Please help me to find the script.
... (2 Replies)
Discussion started by: nossam
2 Replies
3. Red Hat
Heyas
So i have my custom Fedora with AwesomeWM spin with alots of customizations using the kickstart method for a liveimage.
A few weeks (2-3 months) ago, i've done some changes i cannot remember.
Those changes made the image from bootable to gui, to not booting to gui any more.
Just... (3 Replies)
Discussion started by: sea
3 Replies
4. UNIX for Advanced & Expert Users
Hi all,
I have to test some user priviliges. The goal is to be sure that an unauthorized user can't restart some modules (ssh, mysql etc...).
I'm trying to automate it with a shell script but in same cases I got the syslog broadcast message.
Is there any way to simply get a return code... (3 Replies)
Discussion started by: Dedalus
3 Replies
5. Red Hat
Hello all,
If anyone has time, I have a few questions:
How do I do the following in Linux. We are using Red Hat and Oracle Enterprise Linux, which is based on Red Hat too.
1. How to lock the account after a few (like 3) invalid password attempts?
2. How do you lock a screen after 30... (1 Reply)
Discussion started by: nstarz
1 Replies
6. Programming
I have a Java program. I want to measure the total memory used by the program, especially the peak memory. Is there a way to do it?
I have tried utilities like time (which returns 0) and top (which is not very useful) as the program does not run for long.
Can anyone suggest a way to do this?... (5 Replies)
Discussion started by: spathical
5 Replies
7. IP Networking
i have a wireless network that is connected to internet over nat.there is ap that is connected to another ap in bridge mode, on ap is used for clients, and the other is connected to the machine that is doing masquerading. so i want to measure traffic of my clients and i thought about doing it with... (0 Replies)
Discussion started by: mdfk
0 Replies
8. UNIX for Dummies Questions & Answers
how can I lock my keyboard while I'm away from the computer without using lock command. What other commands gives me the option to lock keyboard device?
thanks (7 Replies)
Discussion started by: dianayun
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SPINLOCK(3) BSD Library Functions Manual SPINLOCK(3)
NAME
OSSpinLockTry, OSSpinLockLock, OSSpinLockUnlock -- atomic spin lock synchronization primitives
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <libkern/OSAtomic.h>
bool
OSSpinLockTry(OSSpinLock *lock);
void
OSSpinLockLock(OSSpinLock *lock);
void
OSSpinLockUnlock(OSSpinLock *lock);
DESCRIPTION
Spin locks are a simple, fast, thread-safe synchronization primitive that is suitable in situations where contention is expected to be low.
The spinlock operations use memory barriers to synchronize access to shared memory protected by the lock. Preemption is possible while the
lock is held.
OSSpinLock is an integer type. The convention is that unlocked is zero, and locked is nonzero. Locks must be naturally aligned and cannot
be in cache-inhibited memory.
OSSpinLockLock() will spin if the lock is already held, but employs various strategies to back off, making it immune to most priority-inver-
sion livelocks. But because it can spin, it may be inefficient in some situations.
OSSpinLockTry() immediately returns false if the lock was held, true if it took the lock. It does not spin.
OSSpinLockUnlock() unconditionally unlocks the lock by zeroing it.
RETURN VALUES
OSSpinLockTry() returns true if it took the lock, false if the lock was already held.
SEE ALSO
atomic(3), barrier(3)
Darwin May 26, 2004 Darwin
