BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  ISAPI access violations          BorlandTalk.com Forum Index -> Delphi Internet Isapi-WebBroker View previous topic :: View next topic   Author Message Jan Guest Posted: Tue Feb 20, 2007 9:11 am    Post subject: ISAPI access violations We've got an ISAPI webbroker dll (Delphi 7). We have a test client app that simulates many users hitting the dll simultaneously - via Posts(Indy's idhttp)- and these posts randomly return access violations. The more "users"(well, 30 threads, spaced 5 secs apart in a client app) we hit it with, the more access violations we get. We were getting a bunch of 500 Internal Server Errors back, but these were reduced to a very rare occurrence once a CriticalSection was introduced. Also tried: - Steve Trefethen's updated ISAPIThreadPool.pas (http://www.stevetrefethen.com/blog/ISAPIThreadPoolForUseInDelphiWebBrokerApplications.aspx), and placed it after ISAPIApp in the project file - Disabling Norton anti-virus made a difference in reducing the AVs (but of course we can't ask our clients to disable this) - Increased the Application.MaxConnections The errors look like "HTTP/1.1 500 Access violation at address 018622EC in module 'MyISAPI.dll'. Write of address CE83EA6C" Anybody else seen this behavior? I've inherited this thing, already fixed several issues and tired of looking at it- so could use all the perspective I can get . Thanks! Jan Back to top danny heijl Guest Posted: Wed Feb 21, 2007 1:16 am    Post subject: Re: ISAPI access violations Jan schreef: Quote: so could use all the perspective I can get . Start by wrapping all major parts of the code inside try...except blocks, add context information to each exception message (which procedure function, parameter values, dataset related info, user related info, etc...), log it, and make a nice error page with it. This way you will probably see a pattern emerging that will hopefully give you an indication of were to start looking. Danny --- Back to top        BorlandTalk.com Forum Index -> Delphi Internet Isapi-WebBroker All times are GMT Page 1 of 1 Powered by phpBB © 2001, 2006 phpBB Group .