Solved

TMultiReadExclusiveWriteSynchronizer.EndWrite throw EAccessViolation

Posted on 2002-07-01
5
692 Views
Last Modified: 2010-04-04
Hi,

A TMultiReadExclusiveWriteSynchronizer that was initialized (in the initialization section of the unit) raised a EAccessViolation on attempt to EndWrite().
This happen suddently after many calls to the function containing the call to EndWrite()

How can that be?

(Delphi 6 Professinal)

Offir.
0
Comment
Question by:mathought
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
5 Comments
 
LVL 14

Expert Comment

by:AvonWyss
ID: 7121932
Maybe the memory area whgere the object is stored in got overwritten, or its pointer was somehow corrupted? This is more often the case than you may think.
0
 

Author Comment

by:mathought
ID: 7122012
0
 
LVL 14

Expert Comment

by:AvonWyss
ID: 7122303
Deadlocks have nothing top do with AVs. Therefore, this bug (which actually is a conclusion of the way a TMultiReadExclusiveWriteSynchronizer works) has nothing to do with the problem mentionned here.

A deadlock happens when two (or more) threads are in a waiting state, each one waiting for the other one, therefore never existing the wait state.
0
 

Author Comment

by:mathought
ID: 7123981
I had both daed-locks and this AV.
When I moved to TCriticalSection, the problem disappeared.
0
 
LVL 14

Accepted Solution

by:
AvonWyss earned 100 total points
ID: 7124601
A critical section is both smaller and cannot lead to deadlocks as long as only one CS is in use. However, I still would not expect any AV to happen.
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
code issue 8 187
Delphi: Connect to running MS Outlook 4 165
shape, triangle, dbctrlgrid 3 33
Firemonkey how to swip panel with finger tap 1 23
This article explains how to create forms/units independent of other forms/units object names in a delphi project. Have you ever created a form for user input in a Delphi project and then had the need to have that same form in a other Delphi proj…
Have you ever had your Delphi form/application just hanging while waiting for data to load? This is the article to read if you want to learn some things about adding threads for data loading in the background. First, I'll setup a general applica…
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…
Attackers love to prey on accounts that have privileges. Reducing privileged accounts and protecting privileged accounts therefore is paramount. Users, groups, and service accounts need to be protected to help protect the entire Active Directory …

726 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question