On 5/1/07, Darren Cook <[EMAIL PROTECTED]> wrote:
> smaller for larger boards. The only part of our program that is not
> strictly ANSI C++ compliant is is_there_input(), ...
> ...
> return select(1,&read,&write,&except,&timeout);
> ...
> If you are interested on a Windows equivalent, I might be able to
> provide one.
Hi Alvaro,
I'm interested in a windows equivalent, though for a program nothing to
do with computer go. Basically select() on windows does not work for
stdin (it only works for sockets created with winsock).
The code I found to use is:
DWORD stdin_timeout=100; //In milliseconds, so sleep for 0.1s.
HANDLE stdin_handle=GetStdHandle(STD_INPUT_HANDLE);
DWORD stdin_wait_result=WaitForSingleObject(stdin_handle,stdin_timeout);
if(stdin_wait_result==WAIT_OBJECT_0){
//There is input on stdin
}
else{
//Stdin is quiet
}
(For a pondering go program you want stdin_timeout set to 0.)
However, I suspect this code is actually blocking (sometimes?). In
addition behaviour seems to be different in each of:
* Using it from the console
* Using it where stdin is connected to a pipe (also see [1])
* Using it under cygwin, over ssh.
Yes, this is true. The version I wrote (this was for a chess program
using UCI), was only good for the case of a pipe, which is the
relevant one if you plug your program to a GUI. If case this might be
what you are looking for, here it is:
#include <windows.h>
bool is_there_input(){
static DWORD available;
available = 0;
static HANDLE stdin_h = GetStdHandle(STD_INPUT_HANDLE);
PeekNamedPipe(stdin_h, NULL, 0, 0, &available, 0);
return available > 0;
}
Most of what google has turned up for me so far is that if you want to
reliably read from stdin in a non-blocking way you should use threads.
Like you, this is a path I don't want to go down, especially as
select(stdin) works fine on linux, but it is looking like I have no choice.
Darren
[1]:
http://communicator.sourceforge.net/sites/MITRE/distributions/GalaxyCommunicator/contrib/MITRE/utilities/src/stdin_utility.c
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