Hello!
What you can try out is: have a huge circular buffer for example say around 6144 (6KB) , you can experiment with the size!!
What i mean by circular is have two pointers, start_ptr and processed_ptr.
1) Have start_ptr and processed_ptr as global
2) You must take care of rollover of processed_ptr for every read
Hi All,
I have written a script which does some editing in the files, based on user input.This might not be the most elegant way of doing it and there would be many improvements needed.
Please go through it and let me know how it could be improved.
Suggestions are welcome!!
Thanks!... (2 Replies)
Hi!
Thank you for the help yesterday
This is the finished product
There is one more thing I would like to do to it but I’m not to certain
On how to proceed I would like to log all output to a log in order to
Be able to roll back
This script is meant to be used in repairing a... (4 Replies)
Hello,
I am pretty new to shell scripts and I recently wrote one that seems to do what it should but I am exploring the possibility of improving its performance and would appreciate some help. Here is what it does - Its meant to monitor a bunch of systems (reads in IPs one at a time from a flat... (9 Replies)
can anyone help to share the knowledge on linux os improvement?
1) os account
- use window AD authentication, such as ldap, but how to set /etc/passwd, where to put user home?
2) user account activity
- how to log os user activity
share the idea and what tools can do that...thx (5 Replies)
Hi All,
Here is my script
#! /bin/sh
var1=some email id
var2=some email id
grep -i "FAILED FILE FORMAT VALIDATION" /opt >tmp2
diff tmp1 tmp2 | grep ">" >tmp3
if
then
cat tmp3 | mailx -s " Error Monitoring" $var2
else
echo "Pattern NOt Found" | mailx -s " Error Monitoring" $var1... (1 Reply)
Hi This is my Following code:
#!/bin/sh
echo "TOTAL_NO_OF_MAILS"
read TOTAL_NO_OF_MAILS
echo "TOTAL_NO_OF_TICKETS "
read TOTAL_NO_OF_TICKETS
echo "TICKETS_IN_QUEUE"
read TICKETS_IN_QUEUE
rm -rf `pwd`/Focus
echo "Hi Team\nSTATS IN CLRS MAIL BOX\n\n==============================" >> Focus... (11 Replies)
Below script is used to search numeric data from around 400 files in a folder. I have 300 such folders. Need help in performance improvement in the script.
Below Script searches 20 such folders ( 300 files in each folder) simultaneously. This increases cpu utilization upto 90% What changes... (3 Replies)
Discussion started by: vegasluxor
3 Replies
LEARN ABOUT SUNOS
pthread_rwlock_trywrlock
pthread_rwlock_wrlock(3C)pthread_rwlock_wrlock(3C)NAME
pthread_rwlock_wrlock, pthread_rwlock_trywrlock - lock or attempt to lock read-write lock object for writing
SYNOPSIS
cc -mt [ flag... ] file... -lpthread [ library... ]
#include <pthread.h>
int pthread_rwlock_wrlock(pthread_rwlock_t *rwlock);
int pthread_rwlock_trywrlock(pthread_rwlock_t *rwlock);
The pthread_rwlock_wrlock() function applies a write lock to the read-write lock referenced by rwlock. The calling thread acquires the
write lock if no other thread (reader or writer) holds the read-write lock rwlock. Otherwise, the thread blocks until it can acquire the
lock.
The pthread_rwlock_trywrlock() function applies a write lock like the pthread_rwlock_wrlock() function, with the exception that the func-
tion fails if any thread currently holds rwlock (for reading or writing).
Writers are favored over readers of the same priority to avoid writer starvation. See pthread_rwlock_rdlock(3C).
Results are undefined if any of these functions are called with an uninitialized read-write lock.
If a signal is delivered to a thread waiting for a read-write lock for writing, upon return from the signal handler the thread resumes
waiting for the read-write lock for writing as if it was not interrupted.
If successful, the pthread_rwlock_wrlock() function returns 0. Otherwise, an error number is returned to indicate the error.
The pthread_rwlock_trywrlock() function returns 0 if the lock for writing on the read-write lock object referenced by rwlock is acquired.
Otherwise an error number is returned to indicate the error.
The pthread_rwlock_wrlock() function will fail if:
EDEADLK The current thread already owns the read-write lock for writing or reading.
The pthread_rwlock_trywrlock() function will fail if:
EBUSY The read-write lock could not be acquired for writing because it was already locked for reading or writing.
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
pthread_rwlock_init(3C), pthread_rwlock_unlock(3C), pthread_rwlockattr_init(3C), pthread_rwlock_rdlock(3C), attributes(5), standards(5)
23 Mar 2005 pthread_rwlock_wrlock(3C)