Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
1.How to understand asynchronous io in Windows??
2.If I write/read something to the file using asynchronous io :
WriteFile(); ReadFile(); WriteFile(); How many threads does the OS generate to accomplish these task?
Do the 3 task run simultaneously and in multi-threading way or run one after another just with different order?
3.Can I use multithreading and in each thread using a asynchronous io to read or write the same file？
To your questions:
Depends if you are using the windows pools, iocp, etc. Generally you decide.
This depends on your architecture. On a single-cored machine, the 3 tasks would run one after another and the order would be os decided. On a multi-cored machine these might run together, depending on how the OS scheduled the threads.
That is out of my knowledge so someone else would need to answer that one.
I suggest getting a copy of Windows via C/C++ as that has a very large chapter on Asynchronous IO.