Extract Awakable from Waiter

mojo/edk/system/waiter.cc

 // Copyright 2013 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/system/waiter.h"
 
 #include <limits>
 
 #include "base/logging.h"
 #include "base/time/time.h"
@@ skipping 31 matching lines @@
 #ifndef NDEBUG
   DCHECK(initialized_);
   // It'll need to be re-initialized after this.
   initialized_ = false;
 #endif
 
   // Fast-path the already-awoken case:
   if (awoken_) {
     DCHECK_NE(awake_result_, MOJO_RESULT_INTERNAL);
     if (context)
-      *context = awake_context_;
+      *context = static_cast<uint32_t>(awake_context_);
     return awake_result_;
   }
 
   // |MojoDeadline| is actually a |uint64_t|, but we need a signed quantity.
   // Treat any out-of-range deadline as "forever" (which is wrong, but okay
   // since 2^63 microseconds is ~300000 years). Note that this also takes care
   // of the |MOJO_DEADLINE_INDEFINITE| (= 2^64 - 1) case.
   if (deadline > static_cast<uint64_t>(std::numeric_limits<int64_t>::max())) {
     do {
       cv_.Wait();
     } while (!awoken_);
   } else {
     // NOTE(vtl): This is very inefficient on POSIX, since pthreads condition
     // variables take an absolute deadline.
     const base::TimeTicks end_time =
         base::TimeTicks::Now() +
         base::TimeDelta::FromMicroseconds(static_cast<int64_t>(deadline));
     do {
       base::TimeTicks now_time = base::TimeTicks::Now();
       if (now_time >= end_time)
         return MOJO_RESULT_DEADLINE_EXCEEDED;
 
       cv_.TimedWait(end_time - now_time);
     } while (!awoken_);
   }
 
   DCHECK_NE(awake_result_, MOJO_RESULT_INTERNAL);
   if (context)
-    *context = awake_context_;
+    *context = static_cast<uint32_t>(awake_context_);
   return awake_result_;
 }
 
-void Waiter::Awake(MojoResult result, uint32_t context) {
+void Waiter::Awake(MojoResult result, uintptr_t context) {
   base::AutoLock locker(lock_);
 
   if (awoken_)
     return;
 
   awoken_ = true;
   awake_result_ = result;
   awake_context_ = context;
   cv_.Signal();
   // |cv_.Wait()|/|cv_.TimedWait()| will return after |lock_| is released.
 }
 
 }  // namespace system
 }  // namespace mojo