Re: Why nonblocking I/O in Java is hard

2000-06-12 Thread Dimitris Vyzovitis
Matt Welsh wrote: Well - anything you do with native code in Java is inherently "dangerous". In a sense yes, but trying to do direct system lib access, while on the same time the green threads lib does its magic makes it suicidial. Although it might even work, I wouldn't put much trust on it - ex

Re: Why nonblocking I/O in Java is hard

2000-06-12 Thread Joseph Shraibman
Matt Welsh wrote: > > Juergen Kreileder <[EMAIL PROTECTED]> writes: > > > "Matt" == Matt Welsh <[EMAIL PROTECTED]> writes: > > > > Matt> Turns out this is not as easy as it could be -- because even > > Matt> though you call system calls like read(), write(), and > > Matt> fcntl()

Re: Why nonblocking I/O in Java is hard

2000-06-12 Thread Matt Welsh
Juergen Kreileder <[EMAIL PROTECTED]> writes: > > "Matt" == Matt Welsh <[EMAIL PROTECTED]> writes: > > Matt> Turns out this is not as easy as it could be -- because even > Matt> though you call system calls like read(), write(), and > Matt> fcntl() from native code, these are tra

Re: Why nonblocking I/O in Java is hard

2000-06-12 Thread Juergen Kreileder
> "Matt" == Matt Welsh <[EMAIL PROTECTED]> writes: Matt> Turns out this is not as easy as it could be -- because even Matt> though you call system calls like read(), write(), and Matt> fcntl() from native code, these are trapped by the Java Matt> runtime library to do magic th

Re: Why nonblocking I/O in Java is hard

2000-06-11 Thread Matt Welsh
Dimitris Vyzovitis <[EMAIL PROTECTED]> writes: > > Isn't that a bit dangerous? Well - anything you do with native code in Java is inherently "dangerous". Obviously it's best to use native threads when doing this kind of thing, but I want compatibility with green threads in case people need tha

Re: Why nonblocking I/O in Java is hard

2000-06-11 Thread Dimitris Vyzovitis
Matt Welsh wrote: In other words, although I was creating a nonblocking socket and issuing read calls against it in JNI-based C code, those system calls (from C) were in fact being caught by the Java runtime library which was turning them back into "blocking" access to the socket. This is because

Why nonblocking I/O in Java is hard

2000-06-11 Thread Matt Welsh
Our discussion on thread overheads and using nonblocking I/O in Java strikes close to home - here at Berkeley we are building an event-driven Internet server platform, implemented entirely in Java. Obviously for this to work we need nonblocking I/O primitives. So, I've been working on implement