[gnome-continuous-yocto/gnomeostree-3.28-rocko: 2859/8267] classes/sstate.bbclass: Enable thread lock when checkstatus

[Emmanuele Bassi <ebassi src gnome org>]

commit f2053844958325496a9387874a8f3182400b71ca
Author: Aníbal Limón <anibal limon linux intel com>
Date:   Tue Oct 4 11:45:53 2016 -0500

    classes/sstate.bbclass: Enable thread lock when checkstatus
    
    The checkstatus function fires an event to notify bitbake UI about
    the progress of the task, this function is implemented using ThreadPool
    and is causing event lose when multiple threads tries to fire an event
    (writes over socket/fd).
    
    [YOCTO #10330]
    
    (From OE-Core rev: 6e0bb9d141438c0051c32b0d3a247915b71ccb82)
    
    Signed-off-by: Aníbal Limón <anibal limon linux intel com>
    Signed-off-by: Richard Purdie <richard purdie linuxfoundation org>

 meta/classes/sstate.bbclass |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/meta/classes/sstate.bbclass b/meta/classes/sstate.bbclass
index 6f0c791..172384b 100644
--- a/meta/classes/sstate.bbclass
+++ b/meta/classes/sstate.bbclass
@@ -851,15 +851,19 @@ def sstate_checkhashes(sq_fn, sq_task, sq_hash, sq_hashfn, d, siginfo=False):
 
         if tasklist:
             bb.event.fire(bb.event.ProcessStarted("Checking sstate mirror object availability", 
len(tasklist)), d)
+
             import multiprocessing
             nproc = min(multiprocessing.cpu_count(), len(tasklist))
 
+            bb.event.enable_threadlock()
             pool = oe.utils.ThreadedPool(nproc, len(tasklist),
                     worker_init=checkstatus_init, worker_end=checkstatus_end)
             for t in tasklist:
                 pool.add_task(checkstatus, t)
             pool.start()
             pool.wait_completion()
+            bb.event.disable_threadlock()
+
             bb.event.fire(bb.event.ProcessFinished("Checking sstate mirror object availability"), d)
             if whitelist and missing:
                 bb.fatal('Required artifacts were unavailable - exiting')