[PATCH v6] eal/unix: fix thread creation

[Tyler Retzlaff]

On Fri, Mar 17, 2023 at 07:52:29PM +0100, David Marchand wrote:
> From: Tyler Retzlaff <roretzla at linux.microsoft.com>
> 
> In rte_thread_create setting affinity after pthread_create may fail.
> Such a failure should result in the entire rte_thread_create failing
> but doesn't.
> 
> Additionally if there is a failure to set affinity a race exists where
> the creating thread will free ctx and depending on scheduling of the new
> thread it may also free ctx (double free).
> 
> Resolve the above by setting the affinity from the newly created thread
> using a condition variable to signal the completion of the thread
> start wrapper having completed.
> 
> Since we are now waiting for the thread start wrapper to complete we can
> allocate the thread start wrapper context on the stack. While here clean
> up the variable naming in the context to better highlight the fields of
> the context require synchronization between the creating and created
> thread.
> 
> Fixes: ce6e911d20f6 ("eal: add thread lifetime API")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Tyler Retzlaff <roretzla at linux.microsoft.com>
> Signed-off-by: David Marchand <david.marchand at redhat.com>
> ---

Looks good to me, not sure if you need a Reviewed-by: from me for the
changes but here is one anyway.

v5
Reviewed-by: Tyler Retzlaff <roretzla at linux.microsoft.com>