Add support for blocking external feed operations when the document db master thread has reached its task limit.

Turning this functionality on/off is controlled by proton config (default off).

1 files changed, 6 insertions, 0 deletions

diff --git a/searchcorespi/src/vespa/searchcorespi/index/ithreadingservice.h b/searchcorespi/src/vespa/searchcorespi/index/ithreadingservice.h
index f30aec94d53..0660f3ab495 100644
--- a/searchcorespi/src/vespa/searchcorespi/index/ithreadingservice.h
+++ b/searchcorespi/src/vespa/searchcorespi/index/ithreadingservice.h
@@ -65,6 +65,12 @@ struct IThreadingService
 
     virtual void sync_all_executors() = 0;
 
+    /**
+     * Block the calling thread until the master thread has capacity to handle more tasks,
+     * and then execute the given task in the master thread.
+     */
+    virtual void blocking_master_execute(vespalib::Executor::Task::UP task) = 0;
+
     virtual IThreadService &master() = 0;
     virtual IThreadService &index() = 0;
     virtual IThreadService &summary() = 0;