Libguestfs - Nov 2018 - [nbdkit PATCH] test-layers: Avoid thread leak

Running 'make check' under a ThreadSanitizer build complains that
test-layers leaks a pthread; while harmless, it is also an easy
fix, by detaching the thread to ensure it gets cleaned up.

Signed-off-by: Eric Blake <eblake@redhat.com>
---
 tests/test-layers.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tests/test-layers.c b/tests/test-layers.c
index 00e6031..7b58699 100644
--- a/tests/test-layers.c
+++ b/tests/test-layers.c
@@ -152,6 +152,12 @@ main (int argc, char *argv[])
     perror ("pthread_create");
     exit (EXIT_FAILURE);
   }
+  err = pthread_detach(&thread);
+  if (err) {
+    errno = err;
+    perror ("pthread_detach");
+    exit (EXIT_FAILURE);
+  }

   /* Note for the purposes of this test we're not very careful about
    * checking for errors (except for the bare minimum) or handling the
-- 
2.17.2

On 11/7/18 9:02 PM, Eric Blake wrote:
> Running 'make check' under a ThreadSanitizer build complains that
> test-layers leaks a pthread; while harmless, it is also an easy
> fix, by detaching the thread to ensure it gets cleaned up.
> 
> Signed-off-by: Eric Blake <eblake@redhat.com>
> ---
>   tests/test-layers.c | 6 ++++++
>   1 file changed, 6 insertions(+)
> 
> diff --git a/tests/test-layers.c b/tests/test-layers.c
> index 00e6031..7b58699 100644
> --- a/tests/test-layers.c
> +++ b/tests/test-layers.c
> @@ -152,6 +152,12 @@ main (int argc, char *argv[])
>       perror ("pthread_create");
>       exit (EXIT_FAILURE);
>     }
> +  err = pthread_detach(&thread);
It helps if I don't send an email prior to amending the commit to 
contain what actually passed testing :)  This line should be:

err = pthread_detach (thread);
> +  if (err) {
> +    errno = err;
> +    perror ("pthread_detach");
> +    exit (EXIT_FAILURE);
> +  }
> 
>     /* Note for the purposes of this test we're not very careful about
>      * checking for errors (except for the bare minimum) or handling the
> 
-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

On Wed, Nov 07, 2018 at 09:16:37PM -0600, Eric Blake
wrote:
> On 11/7/18 9:02 PM, Eric Blake wrote:
> >Running 'make check' under a ThreadSanitizer build complains
that
> >test-layers leaks a pthread; while harmless, it is also an easy
> >fix, by detaching the thread to ensure it gets cleaned up.
> >
> >Signed-off-by: Eric Blake <eblake@redhat.com>
> >---
> >  tests/test-layers.c | 6 ++++++
> >  1 file changed, 6 insertions(+)
> >
> >diff --git a/tests/test-layers.c b/tests/test-layers.c
> >index 00e6031..7b58699 100644
> >--- a/tests/test-layers.c
> >+++ b/tests/test-layers.c
> >@@ -152,6 +152,12 @@ main (int argc, char *argv[])
> >      perror ("pthread_create");
> >      exit (EXIT_FAILURE);
> >    }
> >+  err = pthread_detach(&thread);
> 
> It helps if I don't send an email prior to amending the commit to
> contain what actually passed testing :)  This line should be:
> 
> err = pthread_detach (thread);
> 
> >+  if (err) {
> >+    errno = err;
> >+    perror ("pthread_detach");
> >+    exit (EXIT_FAILURE);
> >+  }
> >
> >    /* Note for the purposes of this test we're not very careful
about
> >     * checking for errors (except for the bare minimum) or handling
the
> >
ACK, thanks.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-df lists disk usage of guests without needing to install any
software inside the virtual machine.  Supports Linux and Windows.
http://people.redhat.com/~rjones/virt-df/