06-07-2003
Maybe.... firing multiple processes aiming to write to a same file may cause such an error.
A write lock prevents any other process from read locking or write locking the protected area. Only one write lock and no read locks may exist for a given segment of a file at a given time. The file descriptor on which a write lock is being placed must have been opened with write access.
See
this
Probably someone else can give you a better answer !!
10 More Discussions You Might Find Interesting
1. Programming
Hi,
We are trying to run dbx on a core file for which we have the original executable and libs, but not the source / object tree. We have recompiled the objects from the original source, but dbx complains that they were compiled at a different time, and refuses to read them:
Object file:... (0 Replies)
Discussion started by: Sabari Nath S
0 Replies
2. Programming
Didn't have this problem in AIX, but ported to Linux with GCC compiler and am now getting a runtime error:
tssutil: symbol lookup error: /work/agility/devel/bin/libagam.so: undefined symbol: fstat
I'm sure most of you know that fstat is an intrinsic function just like printf, memcpy, etc. When I... (5 Replies)
Discussion started by: marcus121
5 Replies
3. Shell Programming and Scripting
Hi,
Can anyone suggest a Unix command or c-shell algorithm to simulate to behavior of "wall" command minus the "all users"? What I'm trying to do is to send a notice to just one particular user but i dont want other remotely-logged-on users to receive the message (on the pseudo-terminals). I... (6 Replies)
Discussion started by: Deanne
6 Replies
4. Programming
Hi,
i am working in C in Fedora Eclipse 3.3.0 with gdb debugger. I am geting segmentation fault with an error message "mi_cmd_var_create: unable to create variable object" on debugging the program.
What should I do to solve this problem?
rgds,
Dona_m (14 Replies)
Discussion started by: dona_m
14 Replies
5. Shell Programming and Scripting
Hi folks,
I am using a shell script to display the referred libraries names of any specified cpp code. Given below is the script:
shell script "grblib"
-------------------------------------------------------------------------
#!/bin/sh
# get the lines having "include" pattern
... (5 Replies)
Discussion started by: frozensmilz
5 Replies
6. Shell Programming and Scripting
Hi,
I have a perl script which is interacting with Database.
I have following line of code :
=================================================
sub BEGIN
{
#use Getopt::Std;
#getopt ('S');
#($STEAP)=($opt_S);
use lib ("/home/perl_lib");
use... (1 Reply)
Discussion started by: rawat_me01
1 Replies
7. Shell Programming and Scripting
Hi,
I have line in input file as below:
3G_CENTRAL;INDONESIA_(M)_TELKOMSEL;SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL
My expected output for line in the file must be :
"1-Radon1-cMOC_deg"|"LDIndex"|"3G_CENTRAL|INDONESIA_(M)_TELKOMSEL"|LAST|"SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL"
Can someone... (7 Replies)
Discussion started by: shis100
7 Replies
8. HP-UX
HP rp5450 (L2000)
running HP-UX 11.11B
Using DLT 7000 and DLT 4000 tape drives for nightly full backups
Backup jobs created by SAM
DLT 7000 cron entry is as follows:
00 2 * * 1-6 /usr/sam/lbin/br_backup DLT FULL Y /dev/rmt/0m /var/sam/graphLCAa17036 root Y 1 N > /var/sam/SAM_br_msgs 2>&1... (1 Reply)
Discussion started by: dreh99
1 Replies
9. Shell Programming and Scripting
In my quest to solve a bigger problem (See my previous post called "Create SQL DML insert statements from file using AWK or similar" - sorry, not allowed to post urls until I have > 5 posts) I'm trying to get my head round awk, but have some problem figuring out why the following script does work... (2 Replies)
Discussion started by: Yagi Uda
2 Replies
10. Shell Programming and Scripting
Hello,
I am using VirtualBox to simulate a small network with two Linux computers, the host is Mac OS X. My problem is that I can't send "write" and "wall" messages from the host to one of those Linux computers.
Here is what works:
- The virtual Linux computer answers "ping" messages that have... (5 Replies)
Discussion started by: 123_abc
5 Replies
LEARN ABOUT SUNOS
pthread_rwlock_unlock
pthread_rwlock_unlock(3C) pthread_rwlock_unlock(3C)
NAME
pthread_rwlock_unlock - unlock read-write lock object
SYNOPSIS
cc -mt [ flag... ] file... -lpthread [ library... ]
#include <pthread.h>
int pthread_rwlock_unlock(pthread_rwlock_t *rwlock);
The pthread_rwlock_unlock() function is called to release a lock held on the read-write lock object referenced by rwlock. Results are unde-
fined if the read-write lock rwlock is not held by the calling thread.
If this function is called to release a read lock from the read-write lock object and there are other read locks currently held on this
read-write lock object, the read-write lock object remains in the read locked state. If this function releases the calling thread's last
read lock on this read-write lock object, then the calling thread is no longer one of the owners of the object. If this function releases
the last read lock for this read-write lock object, the read-write lock object will be put in the unlocked state with no owners.
If this function is called to release a write lock for this read-write lock object, the read-write lock object will be put in the unlocked
state with no owners.
If the call to the pthread_rwlock_unlock() function results in the read-write lock object becoming unlocked and there are multiple threads
waiting to acquire the read-write lock object for writing, the scheduling policy is used to determine which thread acquires the read-write
lock object for writing. If there are multiple threads waiting to acquire the read-write lock object for reading, the scheduling policy is
used to determine the order in which the waiting threads acquire the read-write lock object for reading. If there are multiple threads
blocked on rwlock for both read locks and write locks, it is unspecified whether the readers acquire the lock first or whether a writer
acquires the lock first.
Results are undefined if any of these functions are called with an uninitialized read-write lock.
If successful, the pthread_rwlock_unlock() function returns 0. Otherwise, an error number is returned to indicate the error.
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_rdlock(3C), pthread_rwlock_wrlock(3C), pthread_rwlockattr_init(3C), attributes(5), standards(5)
23 Mar 2005 pthread_rwlock_unlock(3C)