Task scheduler: Add thread-aware task push routines

This commit implements new function BLI_task_pool_push_from_thread()
who's main goal is to have less parasitic load on the CPU bu avoiding
memory allocations as much as possible, making taks pushing cheaper.

This function expects thread ID, which must be 0 for the thread from
which pool is created from (and from which wait_work() is called) and
for other threads it mush be the ID which was sent to the thread working
function.

This reduces allocations quite a bit in the new dependency graph,
hopefully gaining some visible speedup on a fewzillion core machines
(on my own machine can only see benefit in profiler, which shows
significant reduce of time wasted in the memory allocation).

1 files changed, 3 insertions, 1 deletions

diff --git a/source/blender/blenlib/BLI_task.h b/source/blender/blenlib/BLI_task.h
index 63a07957336..4cf1d8baaf0 100644
--- a/source/blender/blenlib/BLI_task.h
+++ b/source/blender/blenlib/BLI_task.h
@@ -84,7 +84,9 @@ void BLI_task_pool_push_ex(
         TaskPool *pool, TaskRunFunction run, void *taskdata,
         bool free_taskdata, TaskFreeFunction freedata, TaskPriority priority);
 void BLI_task_pool_push(TaskPool *pool, TaskRunFunction run,
-	void *taskdata, bool free_taskdata, TaskPriority priority);
+        void *taskdata, bool free_taskdata, TaskPriority priority);
+void BLI_task_pool_push_from_thread(TaskPool *pool, TaskRunFunction run,
+        void *taskdata, bool free_taskdata, TaskPriority priority, int thread_id);
 
 /* work and wait until all tasks are done */
 void BLI_task_pool_work_and_wait(TaskPool *pool);