зеркало из https://github.com/mozilla/gecko-dev.git
132 строки
3.5 KiB
C++
132 строки
3.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#ifndef mozilla_net_Tickler_h
|
|
#define mozilla_net_Tickler_h
|
|
|
|
// The tickler sends a regular 0 byte UDP heartbeat out to a
|
|
// particular address for a short time after it has been touched. This
|
|
// is used on some mobile wifi chipsets to mitigate Power Save Polling
|
|
// (PSP) Mode when we are anticipating a response packet
|
|
// soon. Typically PSP adds 100ms of latency to a read event because
|
|
// the packet delivery is not triggered until the 802.11 beacon is
|
|
// delivered to the host (100ms is the standard Access Point
|
|
// configuration for the beacon interval.) Requesting a frequent
|
|
// transmission and getting a CTS frame from the AP at least that
|
|
// frequently allows for low latency receives when we have reason to
|
|
// expect them (e.g a SYN-ACK).
|
|
//
|
|
// The tickler is used to allow RTT based phases of web transport to
|
|
// complete quickly when on wifi - ARP, DNS, TCP handshake, SSL
|
|
// handshake, HTTP headers, and the TCP slow start phase. The
|
|
// transaction is given up to 400 miliseconds by default to get
|
|
// through those phases before the tickler is disabled.
|
|
//
|
|
// The tickler only applies to wifi on mobile right now. Hopefully it
|
|
// can also be restricted to particular handset models in the future.
|
|
|
|
#if defined(ANDROID) && !defined(MOZ_PROXY_BYPASS_PROTECTION)
|
|
#define MOZ_USE_WIFI_TICKLER
|
|
#endif
|
|
|
|
#include "mozilla/Attributes.h"
|
|
#include "nsISupports.h"
|
|
#include <stdint.h>
|
|
|
|
#ifdef MOZ_USE_WIFI_TICKLER
|
|
#include "mozilla/Mutex.h"
|
|
#include "mozilla/TimeStamp.h"
|
|
#include "nsAutoPtr.h"
|
|
#include "nsISupports.h"
|
|
#include "nsIThread.h"
|
|
#include "nsITimer.h"
|
|
#include "nsWeakReference.h"
|
|
#include "prio.h"
|
|
|
|
class nsIPrefBranch;
|
|
#endif
|
|
|
|
namespace mozilla {
|
|
namespace net {
|
|
|
|
#ifdef MOZ_USE_WIFI_TICKLER
|
|
|
|
// 8f769ed6-207c-4af9-9f7e-9e832da3754e
|
|
#define NS_TICKLER_IID \
|
|
{ 0x8f769ed6, 0x207c, 0x4af9, \
|
|
{ 0x9f, 0x7e, 0x9e, 0x83, 0x2d, 0xa3, 0x75, 0x4e } }
|
|
|
|
class Tickler final : public nsSupportsWeakReference
|
|
{
|
|
public:
|
|
NS_DECL_THREADSAFE_ISUPPORTS
|
|
NS_DECLARE_STATIC_IID_ACCESSOR(NS_TICKLER_IID)
|
|
|
|
// These methods are main thread only
|
|
Tickler();
|
|
void Cancel();
|
|
nsresult Init();
|
|
void SetIPV4Address(uint32_t address);
|
|
void SetIPV4Port(uint16_t port);
|
|
|
|
// Tickle the tickler to (re-)start the activity.
|
|
// May call from any thread
|
|
void Tickle();
|
|
|
|
private:
|
|
~Tickler();
|
|
|
|
friend class TicklerTimer;
|
|
Mutex mLock;
|
|
nsCOMPtr<nsIThread> mThread;
|
|
nsCOMPtr<nsITimer> mTimer;
|
|
nsCOMPtr<nsIPrefBranch> mPrefs;
|
|
|
|
bool mActive;
|
|
bool mCanceled;
|
|
bool mEnabled;
|
|
uint32_t mDelay;
|
|
TimeDuration mDuration;
|
|
PRFileDesc* mFD;
|
|
|
|
TimeStamp mLastTickle;
|
|
PRNetAddr mAddr;
|
|
|
|
// These functions may be called from any thread
|
|
void PostCheckTickler();
|
|
void MaybeStartTickler();
|
|
void MaybeStartTicklerUnlocked();
|
|
|
|
// Tickler thread only
|
|
void CheckTickler();
|
|
void StartTickler();
|
|
void StopTickler();
|
|
};
|
|
|
|
NS_DEFINE_STATIC_IID_ACCESSOR(Tickler, NS_TICKLER_IID)
|
|
|
|
#else // not defined MOZ_USE_WIFI_TICKLER
|
|
|
|
class Tickler final : public nsISupports
|
|
{
|
|
~Tickler() { }
|
|
public:
|
|
NS_DECL_THREADSAFE_ISUPPORTS
|
|
|
|
Tickler() { }
|
|
nsresult Init() { return NS_ERROR_NOT_IMPLEMENTED; }
|
|
void Cancel() { }
|
|
void SetIPV4Address(uint32_t) { };
|
|
void SetIPV4Port(uint16_t) { }
|
|
void Tickle() { }
|
|
};
|
|
|
|
#endif // defined MOZ_USE_WIFI_TICKLER
|
|
|
|
} // namespace net
|
|
} // namespace mozilla
|
|
|
|
#endif // mozilla_net_Tickler_h
|