Re^2: Signals vs. Windows

in reply to Re: Signals vs. Windows
in thread Signals vs. Windows

The pertinent text I missed was actually out of "threads" which was:

Correspondingly, sending a signal to a thread does not disrupt the operation the thread is currently working on: The signal will be acted upon after the current operation has completed. For instance, if the thread is stuck on an I/O call, sending it a signal will not cause the I/O call to be interrupted such that the signal is acted up immediately.

Nothing in the documentation suggests that signals are not the way to perform IPC, but simply threads don't react to signals as well as processes. Keep in mind, I don't want to simply suspend or terminate the thread, but interrupt it and send it off in another direction. So, the problem restated is, I guess, how do I interrupt a thread from an I/O operation?

Comment on Re^2: Signals vs. Windows

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Re^3: Signals vs. Windows by bulk88 (Priest) on Oct 03, 2012 at 19:48 UTC
So, the problem restated is, I guess, how do I interrupt a thread from an I/O operation? 1. dont use blocking I/O, use overlapped/async I/O 2. use Native API, create an alertable synchronous file handle using NtCreateFile, post a timer APC to the blocked thread with SetWaitableTimer, the APC will call CancelIo from within the blocked thread, and the blocked I/O will unblock.	[reply]
Re^4: Signals vs. Windows by DanEllison (Scribe) on Oct 04, 2012 at 13:35 UTC
I'm trying to avoid a Windows only solution.	[reply]
Re^5: Signals vs. Windows by bulk88 (Priest) on Oct 05, 2012 at 00:20 UTC
You won't get very far with Win32 Perl. Try Cygwin Perl then. This is what MS supports as "signals", http://msdn.microsoft.com/en-us/library/xdkz3x12%28v=vs.71%29.aspx, which is Ctrl-C and that is it. Perl adds some more support in http://perl5.git.perl.org/perl.git/blob/6aa4fbb50135d4863535200030aadfeb8c583c6e:/win32/win32.c#l4174 and http://perl5.git.perl.org/perl.git/blob/6aa4fbb50135d4863535200030aadfeb8c583c6e:/win32/win32.c#l4174.	[reply]
Re^3: Signals vs. Windows by Anonymous Monk on Oct 03, 2012 at 17:49 UTC
Nothing in the documentation suggests that signals are not the way to perform IPC Hmm, "unsafe" about says it all :) So, the problem restated is, I guess, how do I interrupt a thread from an I/O operation? stop using safe signals, use unsafe signals, use kill	[reply]

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