Source release 16.2.0

util/test/test_sleep.cpp

@@ -0,0 +1,44 @@
+// Copyright 2019 Google LLC. All Rights Reserved. This file and proprietary
+// source code may only be used and distributed under the Widevine Master
+// License Agreement.
+
+#include "test_sleep.h"
+
+#include <unistd.h>
+
+#include <chrono>
+
+#include "clock.h"
+
+namespace wvcdm {
+
+bool TestSleep::real_sleep_ = true;
+TestSleep::CallBack* TestSleep::callback_ = nullptr;
+
+void TestSleep::Sleep(unsigned int seconds) {
+  int64_t milliseconds = 1000 * seconds;
+  if (real_sleep_) {
+    // This next bit of logic is to avoid slow drift apart of the real clock and
+    // the fake clock.  We compute how far from the real clock has advanced in
+    // total since the start, and then compare to a running total of sleep
+    // calls. We sleep for approximately x second, and then advance the clock by
+    // the amount of time that has actually passed.
+    static auto start_real = std::chrono::steady_clock().now();
+    static int64_t fake_clock = 0;
+    sleep(seconds);
+    auto now_real = std::chrono::steady_clock().now();
+    int64_t total_real = (now_real - start_real) / std::chrono::milliseconds(1);
+    // We want to advance the fake clock by the difference between the real
+    // clock, and the previous value on the fake clock.
+    milliseconds = total_real - fake_clock;
+    fake_clock += milliseconds;
+  }
+  if (callback_ != nullptr) callback_->ElapseTime(milliseconds);
+}
+
+void TestSleep::SyncFakeClock() {
+  // Syncing can be done by sleeping 0 seconds.
+  Sleep(0);
+}
+
+}  // namespace wvcdm