What is the system cost of subject callbacks vs. process callbacks?
Article ID: KB0085300
Updated On:
| Products | Versions |
|---|---|
| TIBCO SmartSockets | - |
| Not Applicable | - |
Description
Resolution:
Whenever a subject callback is created, if the subject is new (no other callbacks exist for that subject) then two mutexes and a conditional variable is created (this consumes three handles) to protect the callback in a multithreaded environment. So, with 2000 subject callbacks each with a unique subject (2000 * 3) 6000 handles are used.In Windows 2000 you can have 65K handles open per process. These three handles per unique message type are used even in single-threaded apps. No such penalty is incurred using process callbacks.
Whenever a subject callback is created, if the subject is new (no other callbacks exist for that subject) then two mutexes and a conditional variable is created (this consumes three handles) to protect the callback in a multithreaded environment. So, with 2000 subject callbacks each with a unique subject (2000 * 3) 6000 handles are used.In Windows 2000 you can have 65K handles open per process. These three handles per unique message type are used even in single-threaded apps. No such penalty is incurred using process callbacks.
Issue/Introduction
What is the system cost of subject callbacks vs. process callbacks?
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