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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef PPAPI_SHARED_IMPL_PPB_MESSAGE_LOOP_SHARED_H_
#define PPAPI_SHARED_IMPL_PPB_MESSAGE_LOOP_SHARED_H_
#include <stdint.h>
#include "base/functional/callback_forward.h"
#include "base/location.h"
#include "ppapi/c/pp_instance.h"
#include "ppapi/shared_impl/ppapi_shared_export.h"
#include "ppapi/shared_impl/resource.h"
#include "ppapi/thunk/ppb_message_loop_api.h"
namespace base {
class Location;
class SingleThreadTaskRunner;
}
namespace ppapi {
// MessageLoopShared doesn't really do anything interesting. It exists so that
// shared code (in particular, TrackedCallback) can keep a pointer to a
// MessageLoop resource. In the host side, there is not a concrete class that
// implements this. So pointers to MessageLoopShared can only really be valid
// on the plugin side.
class PPAPI_SHARED_EXPORT MessageLoopShared
: public Resource,
public thunk::PPB_MessageLoop_API {
public:
explicit MessageLoopShared(PP_Instance instance);
// Construct the one MessageLoopShared for the main thread. This must be
// invoked on the main thread.
struct ForMainThread {};
explicit MessageLoopShared(ForMainThread);
MessageLoopShared(const MessageLoopShared&) = delete;
MessageLoopShared& operator=(const MessageLoopShared&) = delete;
virtual ~MessageLoopShared();
// Handles posting to the message loop if there is one, or the pending queue
// if there isn't.
// NOTE: The given closure will be run *WITHOUT* acquiring the Proxy lock.
// This only makes sense for user code and completely thread-safe
// proxy operations (e.g., MessageLoop::QuitClosure).
virtual void PostClosure(const base::Location& from_here,
base::OnceClosure closure,
int64_t delay_ms) = 0;
virtual base::SingleThreadTaskRunner* GetTaskRunner() = 0;
// Returns whether this MessageLoop is currently handling a blocking message
// from JavaScript. This is used to make it illegal to use blocking callbacks
// while the thread is handling a blocking message.
virtual bool CurrentlyHandlingBlockingMessage() = 0;
};
} // namespace ppapi
#endif // PPAPI_SHARED_IMPL_PPB_MESSAGE_LOOP_SHARED_H_
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