Add //mojo/edk/platform/thread_utils.* containing "yield" and "sleep".

mojo/edk/util/waitable_event_unittest.cc

 // Copyright 2015 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.
 
 #include "mojo/edk/util/waitable_event.h"
 
 #include <stdint.h>
 #include <stdlib.h>
 
 #include <atomic>
 #include <thread>
 #include <type_traits>
 #include <vector>
 
-#include "mojo/edk/system/test/sleep.h"
+#include "mojo/edk/platform/thread_utils.h"
 #include "mojo/edk/system/test/stopwatch.h"
 #include "mojo/edk/system/test/timeouts.h"
 #include "mojo/public/cpp/system/macros.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+using mojo::platform::ThreadSleep;
 using mojo::system::test::ActionTimeout;
 using mojo::system::test::DeadlineFromMilliseconds;
 using mojo::system::test::EpsilonTimeout;
-using mojo::system::test::Sleep;
-using mojo::system::test::SleepMilliseconds;
 using mojo::system::test::Stopwatch;
 using mojo::system::test::TinyTimeout;
 
 namespace mojo {
 namespace util {
 namespace {
 
 // Sleeps for a "very small" amount of time.
 void EpsilonRandomSleep() {
-  SleepMilliseconds(static_cast<unsigned>(rand()) % 20u);
+  ThreadSleep(DeadlineFromMilliseconds(static_cast<unsigned>(rand()) % 20u));
 }
 
 // We'll use |MojoDeadline| with |uint64_t| (for |WaitWithTimeout()|'s timeout
 // argument), though note that |WaitWithTimeout()| doesn't support
 // |MOJO_DEADLINE_INDEFINITE|.
 static_assert(std::is_same<uint64_t, MojoDeadline>::value,
               "MojoDeadline isn't uint64_t!");
 
 // AutoResetWaitableEvent ------------------------------------------------------
 
@@ skipping 39 matching lines @@
           EXPECT_FALSE(ev.WaitWithTimeout(ActionTimeout()));
         wake_count.fetch_add(1u);
         // Note: We can't say anything about the signaled state of |ev| here,
         // since the main thread may have already signaled it again.
       }));
     }
 
     // Unfortunately, we can't really wait for the threads to be waiting, so we
     // just sleep for a bit, and count on them having started and advanced to
     // waiting.
-    Sleep(2 * TinyTimeout());
+    ThreadSleep(2 * TinyTimeout());
 
     for (size_t j = 0u; j < threads.size(); j++) {
       unsigned old_wake_count = wake_count.load();
       EXPECT_EQ(j, old_wake_count);
 
       // Each |Signal()| should wake exactly one thread.
       ev.Signal();
 
       // Poll for |wake_count| to change.
       while (wake_count.load() == old_wake_count)
-        Sleep(EpsilonTimeout());
+        ThreadSleep(EpsilonTimeout());
 
       EXPECT_FALSE(ev.IsSignaledForTest());
 
       // And once it's changed, wait a little longer, to see if any other
       // threads are awoken (they shouldn't be).
-      Sleep(EpsilonTimeout());
+      ThreadSleep(EpsilonTimeout());
 
       EXPECT_EQ(old_wake_count + 1u, wake_count.load());
 
       EXPECT_FALSE(ev.IsSignaledForTest());
     }
 
     // Having done that, if we signal |ev| now, it should stay signaled.
     ev.Signal();
-    Sleep(EpsilonTimeout());
+    ThreadSleep(EpsilonTimeout());
     EXPECT_TRUE(ev.IsSignaledForTest());
 
     for (auto& thread : threads)
       thread.join();
 
     ev.Reset();
   }
 }
 
 TEST(AutoResetWaitableEventTest, Timeouts) {
@@ skipping 84 matching lines @@
           ev.Wait();
         else
           EXPECT_FALSE(ev.WaitWithTimeout(ActionTimeout()));
         ev.Reset();
       }));
     }
 
     // Unfortunately, we can't really wait for the threads to be waiting, so we
     // just sleep for a bit, and count on them having started and advanced to
     // waiting.
-    Sleep(2 * TinyTimeout());
+    ThreadSleep(2 * TinyTimeout());
 
     ev.Signal();
 
     // In fact, we may ourselves call |Reset()| immediately.
     ev.Reset();
 
     // The threads will only terminate once they've successfully waited (or
     // timed out).
     for (auto& thread : threads)
       thread.join();
@@ skipping 19 matching lines @@
     // It should time out after *at least* the specified amount of time.
     EXPECT_GE(elapsed, timeout);
     // But we expect that it should time out soon after that amount of time.
     EXPECT_LT(elapsed, timeout + EpsilonTimeout());
   }
 }
 
 }  // namespace
 }  // namespace util
 }  // namespace mojo