From 5f3808170d643b17c721220b926fdd51a133322c Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Thu, 5 Oct 2017 21:10:12 +0200
Subject: Remove Engine dependency from Task

---
 src/server/Engine.cpp     |  2 +-
 src/server/Engine.hpp     |  2 +-
 src/server/RunContext.cpp | 14 ++++++++++++++
 src/server/RunContext.hpp |  8 +++++---
 src/server/Task.cpp       |  8 +++-----
 5 files changed, 24 insertions(+), 10 deletions(-)

diff --git a/src/server/Engine.cpp b/src/server/Engine.cpp
index 8ec74829..8567ae2a 100644
--- a/src/server/Engine.cpp
+++ b/src/server/Engine.cpp
@@ -271,7 +271,7 @@ Engine::wait_for_tasks()
 }
 
 void
-Engine::signal_tasks()
+Engine::signal_tasks_available()
 {
 	_tasks_available.notify_all();
 }
diff --git a/src/server/Engine.hpp b/src/server/Engine.hpp
index cf13f5e6..7c553d5d 100644
--- a/src/server/Engine.hpp
+++ b/src/server/Engine.hpp
@@ -154,7 +154,7 @@ public:
 	void  emit_notifications(FrameTime end);
 	bool  pending_notifications();
 	bool  wait_for_tasks();
-	void  signal_tasks();
+	void  signal_tasks_available();
 	Task* steal_task(unsigned start_thread);
 
 	SPtr<Store> store() const;
diff --git a/src/server/RunContext.cpp b/src/server/RunContext.cpp
index 541f066d..b2e3f269 100644
--- a/src/server/RunContext.cpp
+++ b/src/server/RunContext.cpp
@@ -140,6 +140,20 @@ RunContext::emit_notifications(FrameTime end)
 	}
 }
 
+void
+RunContext::claim_task(Task* task)
+{
+	if ((_task = task)) {
+		_engine.signal_tasks_available();
+	}
+}
+
+Task*
+RunContext::steal_task() const
+{
+	return _engine.steal_task(_id + 1);
+}
+
 void
 RunContext::set_priority(int priority)
 {
diff --git a/src/server/RunContext.hpp b/src/server/RunContext.hpp
index 099ce70f..87fb0fed 100644
--- a/src/server/RunContext.hpp
+++ b/src/server/RunContext.hpp
@@ -114,9 +114,11 @@ public:
 		_nframes = nframes;
 	}
 
-	inline void set_task(Task* task) {
-		_task = task;
-	}
+	/** Claim a parallel task, and signal others that work is available. */
+	void claim_task(Task* task);
+
+	/** Steal a task from some other context if possible. */
+	Task* steal_task() const;
 
 	void set_priority(int priority);
 	void set_rate(SampleCount rate) { _rate = rate; }
diff --git a/src/server/Task.cpp b/src/server/Task.cpp
index 7f1d4327..c76c19ae 100644
--- a/src/server/Task.cpp
+++ b/src/server/Task.cpp
@@ -15,7 +15,6 @@
 */
 
 #include "BlockImpl.hpp"
-#include "Engine.hpp"
 #include "Task.hpp"
 
 namespace Ingen {
@@ -46,14 +45,13 @@ Task::run(RunContext& context)
 		Task* t = steal(context);
 
 		// Allow other threads to steal sub-tasks
-		context.set_task(this);
-		context.engine().signal_tasks();
+		context.claim_task(this);
 
 		// Run available tasks until this task is finished
 		for (; t; t = get_task(context)) {
 			t->run(context);
 		}
-		context.set_task(nullptr);
+		context.claim_task(nullptr);
 		break;
 	}
 
@@ -93,7 +91,7 @@ Task::get_task(RunContext& context)
 		}
 
 		// All child tasks claimed, but some are unfinished, steal a task
-		if ((t = context.engine().steal_task(context.id() + 1))) {
+		if ((t = context.steal_task())) {
 			return t;
 		}
 
-- 
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