Add a new parallel looper for MemPool items to BLI_task.

It merely uses the new thread-safe iterators system of mempool, quite
straight forward.

Note that to avoid possible confusion with two void pointers as
parameters of the callback, a dummy opaque struct pointer is used
instead for the second parameter (pointer generated by iteration over
mempool), callback functions must explicitely convert it to expected
real type.

Also added a basic gtest for this new feature.

1 files changed, 11 insertions, 0 deletions

diff --git a/source/blender/blenlib/BLI_task.h b/source/blender/blenlib/BLI_task.h
index 721327d26a8..ccfa2b6e2e7 100644
--- a/source/blender/blenlib/BLI_task.h
+++ b/source/blender/blenlib/BLI_task.h
@@ -35,6 +35,8 @@ extern "C" {
 #include "BLI_threads.h"
 #include "BLI_utildefines.h"
 
+struct BLI_mempool;
+
 /* Task Scheduler
  * 
  * Central scheduler that holds running threads ready to execute tasks. A single
@@ -150,6 +152,15 @@ void BLI_task_parallel_listbase(
         TaskParallelListbaseFunc func,
         const bool use_threading);
 
+typedef struct MempoolIterData MempoolIterData;
+typedef void (*TaskParallelMempoolFunc)(void *userdata,
+                                        MempoolIterData *iter);
+void BLI_task_parallel_mempool(
+        struct BLI_mempool *mempool,
+        void *userdata,
+        TaskParallelMempoolFunc func,
+        const bool use_threading);
+
 #ifdef __cplusplus
 }
 #endif