Re: [msysGit] [PATCH/RFC 06/11] run-command: add kill_async() and is_async_alive()

From: Johannes Sixt <j6t@kdbg.org>
Date: Nov 26, 2009, 21:46 UTC
Message-ID: <200911262246.13342.j6t@kdbg.org>
In-Reply-To: <1259196260-3064-7-git-send-email-kusmabite@gmail.com>

On Donnerstag, 26. November 2009, Erik Faye-Lund wrote:

Show 8 quoted lines

> +int kill_async(struct async *async)
> +{
> +#ifndef WIN32
> +	return kill(async->pid, SIGTERM);
> +#else
> +	DWORD ret = 0;
> +	if (!TerminateThread(async->tid, 0))
> +		ret = error("killing thread failed: %lu", GetLastError());

Ugh! Did you read the documentation of TerminateThread()?

We need to kill processes/threads when we detect that there are too many connections. But TerminateThread() is such a dangerous function that we cannot pretend that everything is good, and we continue to accept connections.

Unless we find a different solution, I would prefer to punt and die instead.

> +	else if (!GetExitCodeThread(async->tid, &ret))
> +		ret = error("cannot get thread exit code: %lu", GetLastError());

What should the exit code be good for? The return value of this function can only be -1 (failure, could not kill) or 0 (success, process killed).

-- Hannes