Fix iOS implementation of |GetCurrentMonotonicMicros|.

runtime/bin/utils_macos.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_MACOS)
 
 #include <errno.h>  // NOLINT
 #include <netdb.h>  // NOLINT
 #include <mach/mach.h>  // NOLINT
 #include <mach/clock.h>  // NOLINT
 #include <mach/mach_time.h>  // NOLINT
 #include <sys/time.h>  // NOLINT
 #include <time.h>  // NOLINT
 
+#if TARGET_OS_IOS
+#include <sys/sysctl.h>  // NOLINT
+#endif
+
 #include "bin/utils.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
 
 
 namespace dart {
 namespace bin {
 
 OSError::OSError() : sub_system_(kSystem), code_(0), message_(NULL) {
   set_sub_system(kSystem);
@@ skipping 52 matching lines @@
 
 void TimerUtils::InitOnce() {
   kern_return_t kr = mach_timebase_info(&timebase_info);
   ASSERT(KERN_SUCCESS == kr);
 }
 
 int64_t TimerUtils::GetCurrentMonotonicMillis() {
   return GetCurrentMonotonicMicros() / 1000;
 }
 
+#if TARGET_OS_IOS
+
+static int64_t GetCurrentTimeMicros() {
+  // gettimeofday has microsecond resolution.
+  struct timeval tv;
+  if (gettimeofday(&tv, NULL) < 0) {
+    UNREACHABLE();
+    return 0;
+  }
+  return (static_cast<int64_t>(tv.tv_sec) * 1000000) + tv.tv_usec;
+}
+
+#endif  // TARGET_OS_IOS
+
 int64_t TimerUtils::GetCurrentMonotonicMicros() {
 #if TARGET_OS_IOS
   // On iOS mach_absolute_time stops while the device is sleeping. Instead use
   // now - KERN_BOOTTIME to get a time difference that is not impacted by clock
   // changes. KERN_BOOTTIME will be updated by the system whenever the system
   // clock change.
   struct timeval boottime;
   int mib[2] = {CTL_KERN, KERN_BOOTTIME};
   size_t size = sizeof(boottime);
   int kr = sysctl(mib, sizeof(mib) / sizeof(mib[0]), &boottime, &size, NULL, 0);
@@ skipping 31 matching lines @@
     ASSERT(errno == EINTR);
     // Copy remainder into requested and repeat.
     req = rem;
   }
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_MACOS)