File 255437ee-add-threadpool-funcs.patch of Package libvirt.22291

commit 255437eeb710d8135136af11b37ceae674d483ce
Author: Nikolay Shirokovskiy <nshirokovskiy@virtuozzo.com>
Date:   Thu Jul 9 10:58:02 2020 +0300

    util: add stop/drain functions to thread pool
    
    Stop just send signal for threads to exit when they finish with
    current task. Drain waits when all threads will finish.
    
    Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy@virtuozzo.com>
    Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
    Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>

Index: libvirt-6.0.0/src/libvirt_private.syms
===================================================================
--- libvirt-6.0.0.orig/src/libvirt_private.syms
+++ libvirt-6.0.0/src/libvirt_private.syms
@@ -3273,6 +3273,7 @@ virThreadJobSetWorker;
 
 
 # util/virthreadpool.h
+virThreadPoolDrain;
 virThreadPoolFree;
 virThreadPoolGetCurrentWorkers;
 virThreadPoolGetFreeWorkers;
@@ -3283,6 +3284,7 @@ virThreadPoolGetPriorityWorkers;
 virThreadPoolNewFull;
 virThreadPoolSendJob;
 virThreadPoolSetParameters;
+virThreadPoolStop;
 
 
 # util/virtime.h
Index: libvirt-6.0.0/src/util/virthreadpool.c
===================================================================
--- libvirt-6.0.0.orig/src/util/virthreadpool.c
+++ libvirt-6.0.0/src/util/virthreadpool.c
@@ -262,19 +262,27 @@ virThreadPoolNewFull(size_t minWorkers,
 
 }
 
-void virThreadPoolFree(virThreadPoolPtr pool)
-{
-    virThreadPoolJobPtr job;
 
-    if (!pool)
+static void
+virThreadPoolStopLocked(virThreadPoolPtr pool)
+{
+    if (pool->quit)
         return;
 
-    virMutexLock(&pool->mutex);
     pool->quit = true;
     if (pool->nWorkers > 0)
         virCondBroadcast(&pool->cond);
     if (pool->nPrioWorkers > 0)
         virCondBroadcast(&pool->prioCond);
+}
+
+
+static void
+virThreadPoolDrainLocked(virThreadPoolPtr pool)
+{
+    virThreadPoolJobPtr job;
+
+    virThreadPoolStopLocked(pool);
 
     while (pool->nWorkers > 0 || pool->nPrioWorkers > 0)
         ignore_value(virCondWait(&pool->quit_cond, &pool->mutex));
@@ -283,6 +291,15 @@ void virThreadPoolFree(virThreadPoolPtr
         pool->jobList.head = pool->jobList.head->next;
         VIR_FREE(job);
     }
+}
+
+void virThreadPoolFree(virThreadPoolPtr pool)
+{
+    if (!pool)
+        return;
+
+    virMutexLock(&pool->mutex);
+    virThreadPoolDrainLocked(pool);
 
     VIR_FREE(pool->workers);
     virMutexUnlock(&pool->mutex);
@@ -469,3 +486,19 @@ virThreadPoolSetParameters(virThreadPool
     virMutexUnlock(&pool->mutex);
     return -1;
 }
+
+void
+virThreadPoolStop(virThreadPoolPtr pool)
+{
+    virMutexLock(&pool->mutex);
+    virThreadPoolStopLocked(pool);
+    virMutexUnlock(&pool->mutex);
+}
+
+void
+virThreadPoolDrain(virThreadPoolPtr pool)
+{
+    virMutexLock(&pool->mutex);
+    virThreadPoolDrainLocked(pool);
+    virMutexUnlock(&pool->mutex);
+}
Index: libvirt-6.0.0/src/util/virthreadpool.h
===================================================================
--- libvirt-6.0.0.orig/src/util/virthreadpool.h
+++ libvirt-6.0.0/src/util/virthreadpool.h
@@ -56,3 +56,6 @@ int virThreadPoolSetParameters(virThread
                                long long int minWorkers,
                                long long int maxWorkers,
                                long long int prioWorkers);
+
+void virThreadPoolStop(virThreadPoolPtr pool);
+void virThreadPoolDrain(virThreadPoolPtr pool);