Re: [PATCH 1/2] run-command: provide in_async query function

[Jeff King <peff@peff.net>]

On Tue, Sep 01, 2015 at 04:22:43PM -0400, Jeff King wrote:

> diff --git a/run-command.c b/run-command.c
> index 3277cf7..c8029f2 100644
> --- a/run-command.c
> +++ b/run-command.c

This diff is a little funny to read because the interesting context is
far away, and it is not immediately obvious why we are defining the
function twice. This:

> @@ -595,7 +595,7 @@ static NORETURN void die_async(const char *err, va_list params)
>  {
>  	vreportf("fatal: ", err, params);
>  
> -	if (!pthread_equal(main_thread, pthread_self())) {
> +	if (in_async()) {
>  		struct async *async = pthread_getspecific(async_key);
>  		if (async->proc_in >= 0)
>  			close(async->proc_in);
> @@ -614,6 +614,13 @@ static int async_die_is_recursing(void)
>  	return ret != NULL;
>  }
>  
> +int in_async(void)
> +{
> +	if (!main_thread_set)
> +		return 0; /* no asyncs started yet */
> +	return !pthread_equal(main_thread, pthread_self());
> +}
> +
>  #else

is all inside #ifndef NO_PTHREADS, and this:

> @@ -653,6 +660,12 @@ int git_atexit(void (*handler)(void))
>  }
>  #define atexit git_atexit
>  
> +static int process_is_async;
> +int in_async(void)
> +{
> +	return process_is_async;
> +}
> +
>  #endif

is the "#else" case where we fork.

-Peff