Re: [PATCH] test: Fix race condition in T568-lib-thread.sh

Subject: Re: [PATCH] test: Fix race condition in T568-lib-thread.sh

Date: Mon, 15 Feb 2021 22:24:29 +0200

To: David Bremner, notmuch@notmuchmail.org

Cc: David Bremner

From: Tomi Ollila

On Sun, Feb 14 2021, David Bremner wrote:

> The assignment of thread-ids is (apparently) non-deterministic in a
> way that mostly seems to show up on multicore machines. In my tests
> the number is different from that previously assumed by this test
> about 15% of the time on a 50 thread (25 core) Xeon.
>
> Since message id's are fixed, use a message known to be in the thread
> of interest to pick out the correct thread-id.

LGTM.

Tomi


> ---
>  test/T568-lib-thread.sh | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/test/T568-lib-thread.sh b/test/T568-lib-thread.sh
> index ac13d986..088e66dd 100755
> --- a/test/T568-lib-thread.sh
> +++ b/test/T568-lib-thread.sh
> @@ -8,6 +8,11 @@ add_email_corpus
>  test_begin_subtest "building database"
>  test_expect_success "NOTMUCH_NEW"
>  
> +test_begin_subtest "finding thread"
> +THREAD=$(notmuch search --output=threads id:20091117190054.GU3165@dottiness.seas.harvard.edu)
> +count=$(notmuch count $THREAD)
> +test_expect_equal "$count" "7"
> +
>  cat <<'EOF' > c_tail
>     if (stat) {
>         const char *stat_str = notmuch_database_status_string (db);
> @@ -30,7 +35,7 @@ int main (int argc, char** argv)
>     notmuch_thread_t *thread = NULL;
>     notmuch_threads_t *threads = NULL;
>     notmuch_query_t *query = NULL;
> -   const char *id = "thread:0000000000000009";
> +   const char *id = "${THREAD}";
>  
>     stat = notmuch_database_open_verbose (argv[1], NOTMUCH_DATABASE_MODE_READ_WRITE, &db, &msg);
>     if (stat != NOTMUCH_STATUS_SUCCESS) {
> @@ -52,10 +57,11 @@ cat c_head - c_tail <<'EOF' | test_C ${MAIL_DIR}
>          printf("%d\n%s\n", thread != NULL, id2);
>      }
>  EOF
> +thread_num=${THREAD#thread:}
>  cat <<EOF > EXPECTED
>  == stdout ==
>  1
> -0000000000000009
> +${thread_num}
>  == stderr ==
>  EOF
>  test_expect_equal_file EXPECTED OUTPUT
> -- 
> 2.30.0
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