Re: [PATCH 2/2] Remove spurious 'no threads support' warnings

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On Mon, Oct 13, 2014 at 9:54 PM, Junio C Hamano <gitster@xxxxxxxxx> wrote:
> Etienne Buira <etienne.buira@xxxxxxxxx> writes:
>
>> Threads count being defaulted to 0 (autodetect), and --disable-pthreads
>> build checking that thread count==1, there were spurious warnings about
>> threads being ignored, despite not specified on command line/conf.
>>
>> Fixes tests 5521 and 5526 that were broken in --disable-pthreads builds
>> because of those warnings.
>>
>> Signed-off-by: Etienne Buira <etienne.buira@xxxxxxxxx>
>> ---
>
> I am not sure if this is the right fix.
>
> Shouldn't a --threads=0 from the command line (when there is a
> pack.threads configuration hardcoding some number to override it)
> give a chance to the auto detection codepath to ask online_cpus()
> and receive 1 on NO_PTHREADS build to avoid triggering the same
> warning you are squelching with this patch?
>
> That is, something like this instead, perhaps?

Indeed, your patch is better.

> -- >8 --
> Subject: [PATCH] pack-objects: set number of threads before checking and warning
>
> Under NO_PTHREADS build, we warn when delta_search_threads is not
> set to 1, because that is the only sensible value on a single
> threaded build.
>
> However, the auto detection that kicks in when that variable is set
> to 0 (e.g. there is no configuration variable or command line option,
> or an explicit --threads=0 is given from the command line to override
> the pack.threads configuration to force auto-detection) was not done
> before the condition to issue this warning was tested.
>
> Move the auto-detection code and place it at an appropriate spot.
>
> Signed-off-by: Junio C Hamano <gitster@xxxxxxxxx>
> ---
>  builtin/pack-objects.c | 6 ++++--
>  thread-utils.h         | 4 ++++
>  2 files changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
> index d391934..a715237 100644
> --- a/builtin/pack-objects.c
> +++ b/builtin/pack-objects.c
> @@ -1972,8 +1972,6 @@ static void ll_find_deltas(struct object_entry **list, unsigned list_size,
>
>         init_threaded_search();
>
> -       if (!delta_search_threads)      /* --threads=0 means autodetect */
> -               delta_search_threads = online_cpus();
>         if (delta_search_threads <= 1) {
>                 find_deltas(list, &list_size, window, depth, processed);
>                 cleanup_threaded_search();
> @@ -2685,6 +2683,10 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix)
>                 pack_compression_level = Z_DEFAULT_COMPRESSION;
>         else if (pack_compression_level < 0 || pack_compression_level > Z_BEST_COMPRESSION)
>                 die("bad pack compression level %d", pack_compression_level);
> +
> +       if (!delta_search_threads)      /* --threads=0 means autodetect */
> +               delta_search_threads = online_cpus();
> +
>  #ifdef NO_PTHREADS
>         if (delta_search_threads != 1)
>                 warning("no threads support, ignoring --threads");
> diff --git a/thread-utils.h b/thread-utils.h
> index 6fb98c3..d9a769d 100644
> --- a/thread-utils.h
> +++ b/thread-utils.h
> @@ -7,5 +7,9 @@
>  extern int online_cpus(void);
>  extern int init_recursive_mutex(pthread_mutex_t*);
>
> +#else
> +
> +#define online_cpus() 1
> +
>  #endif
>  #endif /* THREAD_COMPAT_H */
> --
> 2.1.2-468-g1a77c5b
>
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