Messages in this thread | | | Date | Thu, 7 Jun 2001 00:56:29 -0400 (EDT) | From | Alexander Viro <> | Subject | Re: PROBLEM: I/O system call never returns if file desc is closed in the |
| |
On Thu, 7 Jun 2001, Matthias Urlichs wrote:
> Select is defined as to return, with the appropriate bit set, if/when > a nonblocking read/write on the file descriptor won't block. You'd > get EBADF in this case, therefore causing the select to return would > be a Good Thing.
Bzzert. Wrong. It may easily block. open() from another thread might grab that descriptor just fine.
If you close descriptors being polled - don't try IO on them once select()/poll() returns. Regardless of aborting select().
> A related problem is that the second thread my be inside a blocking > read() instead of a select() call. It'd never continue. :-(
Yes. So close() doesn't abort read(). Why would it?
Operations like read, select, etc. act of files. Not on descriptors.
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |