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Unified Diff: mojo/edk/system/waiter.h

Issue 623883002: Revert "Move mojo edk into mojo/edk" (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 6 years, 2 months ago
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Index: mojo/edk/system/waiter.h
diff --git a/mojo/edk/system/waiter.h b/mojo/edk/system/waiter.h
deleted file mode 100644
index 03ada1664302e406c9b226c22b39d628f6b72cb3..0000000000000000000000000000000000000000
--- a/mojo/edk/system/waiter.h
+++ /dev/null
@@ -1,81 +0,0 @@
-// Copyright 2013 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 MOJO_EDK_SYSTEM_WAITER_H_
-#define MOJO_EDK_SYSTEM_WAITER_H_
-
-#include <stdint.h>
-
-#include "base/macros.h"
-#include "base/synchronization/condition_variable.h"
-#include "base/synchronization/lock.h"
-#include "mojo/edk/system/system_impl_export.h"
-#include "mojo/public/c/system/types.h"
-
-namespace mojo {
-namespace system {
-
-// IMPORTANT (all-caps gets your attention, right?): |Waiter| methods are called
-// under other locks, in particular, |Dispatcher::lock_|s, so |Waiter| methods
-// must never call out to other objects (in particular, |Dispatcher|s). This
-// class is thread-safe.
-class MOJO_SYSTEM_IMPL_EXPORT Waiter {
- public:
- Waiter();
- ~Waiter();
-
- // A |Waiter| can be used multiple times; |Init()| should be called before
- // each time it's used.
- void Init();
-
- // Waits until a suitable |Awake()| is called. (|context| may be null, in
- // which case, obviously no context is ever returned.)
- // Returns:
- // - The result given to the first call to |Awake()| (possibly before this
- // call to |Wait()|); in this case, |*context| is set to the value passed
- // to that call to |Awake()|.
- // - |MOJO_RESULT_DEADLINE_EXCEEDED| if the deadline was exceeded; in this
- // case |*context| is not modified.
- //
- // Usually, the context passed to |Awake()| will be the value passed to
- // |Dispatcher::AddWaiter()|, which is usually the index to the array of
- // handles passed to |MojoWaitMany()| (or 0 for |MojoWait()|).
- //
- // Typical |Awake()| results are:
- // - |MOJO_RESULT_OK| if one of the flags passed to
- // |MojoWait()|/|MojoWaitMany()| (hence |Dispatcher::AddWaiter()|) was
- // satisfied;
- // - |MOJO_RESULT_CANCELLED| if a handle (on which
- // |MojoWait()|/|MojoWaitMany()| was called) was closed (hence the
- // dispatcher closed); and
- // - |MOJO_RESULT_FAILED_PRECONDITION| if one of the set of flags passed to
- // |MojoWait()|/|MojoWaitMany()| cannot or can no longer be satisfied by
- // the corresponding handle (e.g., if the other end of a message or data
- // pipe is closed).
- MojoResult Wait(MojoDeadline deadline, uint32_t* context);
-
- // Wake the waiter up with the given result and context (or no-op if it's been
- // woken up already).
- void Awake(MojoResult result, uint32_t context);
-
- private:
- base::ConditionVariable cv_; // Associated to |lock_|.
- base::Lock lock_; // Protects the following members.
-#ifndef NDEBUG
- bool initialized_;
-#endif
- bool awoken_;
- MojoResult awake_result_;
- // This is a |uint32_t| because we really only need to store an index (for
- // |MojoWaitMany()|). But in tests, it's convenient to use this for other
- // purposes (e.g., to distinguish between different wake-up reasons).
- uint32_t awake_context_;
-
- DISALLOW_COPY_AND_ASSIGN(Waiter);
-};
-
-} // namespace system
-} // namespace mojo
-
-#endif // MOJO_EDK_SYSTEM_WAITER_H_
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