ApproximateNow

youtube · Nov 1, 2024 · b6dc165 · b6dc165
1 parent a1f634b
commit b6dc165
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Showing 3 changed files with 22 additions and 1 deletion.
diff --git a/net/quic/platform/impl/quic_chromium_clock.cc b/net/quic/platform/impl/quic_chromium_clock.cc
@@ -10,6 +10,11 @@
 
 namespace quic {
 
+namespace {
+QuicTime approximate_now_{QuicTime::Zero()};
+int approximate_now_usage_counter_{0};
+}  // namespace
+
 QuicChromiumClock* QuicChromiumClock::GetInstance() {
   static base::NoDestructor<QuicChromiumClock> instance;
   return instance.get();
@@ -19,16 +24,27 @@ QuicChromiumClock::QuicChromiumClock() = default;
 
 QuicChromiumClock::~QuicChromiumClock() = default;
 
+void QuicChromiumClock::ZeroApproximateNow() {
+  approximate_now_ = QuicTime::Zero();
+  approximate_now_usage_counter_ = 0;
+};
+
 QuicTime QuicChromiumClock::ApproximateNow() const {
   // At the moment, Chrome does not have a distinct notion of ApproximateNow().
   // We should consider implementing this using MessageLoop::recent_time_.
+  if (approximate_now_.IsInitialized() &&
+      ++approximate_now_usage_counter_ < 16) {
+    return approximate_now_;
+  }
   return Now();
 }
 
 QuicTime QuicChromiumClock::Now() const {
   int64_t ticks = (base::TimeTicks::Now() - base::TimeTicks()).InMicroseconds();
   DCHECK_GE(ticks, 0);
-  return CreateTimeFromMicroseconds(ticks);
+  approximate_now_ = CreateTimeFromMicroseconds(ticks);
+  approximate_now_usage_counter_ = 0;
+  return approximate_now_;
 }
 
 QuicWallTime QuicChromiumClock::WallNow() const {

diff --git a/net/quic/platform/impl/quic_chromium_clock.h b/net/quic/platform/impl/quic_chromium_clock.h
@@ -24,6 +24,8 @@ class NET_EXPORT_PRIVATE QuicChromiumClock : public QuicClock {
 
   ~QuicChromiumClock() override;
 
+  void ZeroApproximateNow();
+
   // QuicClock implementation:
   QuicTime ApproximateNow() const override;
   QuicTime Now() const override;

diff --git a/net/quic/quic_chromium_packet_reader.cc b/net/quic/quic_chromium_packet_reader.cc
@@ -10,6 +10,7 @@
 #include "base/task/single_thread_task_runner.h"
 #include "net/base/net_errors.h"
 #include "net/quic/address_utils.h"
+#include "net/quic/platform/impl/quic_chromium_clock.h"
 #include "net/third_party/quiche/src/quiche/quic/core/quic_clock.h"
 
 namespace net {
@@ -45,6 +46,7 @@ QuicChromiumPacketReader::~QuicChromiumPacketReader() = default;
 
 #if defined(STARBOARD)
 int QuicChromiumPacketReader::StartReadingMultiplePackets() {
+  quic::QuicChromiumClock::GetInstance()->ZeroApproximateNow();
   for (;;) {
     if (read_pending_)
       return OK;
@@ -165,6 +167,7 @@ void QuicChromiumPacketReader::StartReading() {
   }
 #endif
 
+  quic::QuicChromiumClock::GetInstance()->ZeroApproximateNow();
   for (;;) {
     if (read_pending_)
       return;