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Unified Diff: base/threading/sequenced_task_runner_handle.h

Issue 1423773003: Add SequencedTaskRunnerHandle to get a SequencedTaskRunner for the current thread / sequence. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: . Created 5 years, 2 months ago
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Index: base/threading/sequenced_task_runner_handle.h
diff --git a/base/threading/sequenced_task_runner_handle.h b/base/threading/sequenced_task_runner_handle.h
new file mode 100644
index 0000000000000000000000000000000000000000..d5bd7ded913858cca46f86fdbbf6a5b499392d82
--- /dev/null
+++ b/base/threading/sequenced_task_runner_handle.h
@@ -0,0 +1,33 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BASE_THREADING_SEQUENCED_TASK_RUNNER_HANDLE_H_
+#define BASE_THREADING_SEQUENCED_TASK_RUNNER_HANDLE_H_
+
+#include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
+
+namespace base {
+
+class SequencedTaskRunner;
+
+class SequencedTaskRunnerHandle {
+ public:
+ // Returns a SequencedTaskRunner which guarantees that posted tasks will only
+ // run after the current task is finished and will satisfy a SequenceChecker.
+ // It will only return a non-null value if one of the following conditions is
+ // fulfilled:
+ // a) The current thread has a ThreadTaskRunnerHandle (which includes any
+ // thread that has a MessageLoop associated with it), or
+ // b) The current thread is a worker thread belonging to a SequencedWorkerPool
+ // *and* is currently running a sequenced task.
+ static scoped_refptr<SequencedTaskRunner> Get();
Sami 2015/10/23 15:47:33 Could this follow the same IsSet/Get contract of T
Bernhard Bauer 2015/10/23 16:20:25 Done.
+
+ private:
+ DISALLOW_IMPLICIT_CONSTRUCTORS(SequencedTaskRunnerHandle);
+};
+
+} // namespace base
+
+#endif // BASE_THREADING_SEQUENCED_TASK_RUNNER_HANDLE_H_
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