Add function support for Sleep with TimeDelta input.

This is the first step of fixing issue 108171 (converting calls of Sleep() to
use TimeDelta instead of ints in milliseconds).  I checked
platform_thread_unittests.cc for any tests explicitly for Sleep but found none,
so I didn't add any for this interface.

There will be a bit more implementation juggling here once the Sleep(int ms)
interface is removed, but that's coming in a later CL.

BUG=108171
TEST=


Review URL: http://codereview.chromium.org/8965072

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@116012 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 13 insertions, 6 deletions

diff --git a/base/threading/platform_thread_posix.cc b/base/threading/platform_thread_posix.cc
index ea1f037..1d72f07 100644
--- a/base/threading/platform_thread_posix.cc
+++ b/base/threading/platform_thread_posix.cc
@@ -152,14 +152,21 @@ void PlatformThread::YieldCurrentThread() {
 
 // static
 void PlatformThread::Sleep(int duration_ms) {
-  struct timespec sleep_time, remaining;
+  // NOTE: This function will be supplanted by the other version of Sleep
+  // in the future.  See issue 108171 for more information.
+  Sleep(TimeDelta::FromMilliseconds(duration_ms));
+}
 
-  // Contains the portion of duration_ms >= 1 sec.
-  sleep_time.tv_sec = duration_ms / 1000;
-  duration_ms -= sleep_time.tv_sec * 1000;
+// static
+void PlatformThread::Sleep(TimeDelta duration) {
+  struct timespec sleep_time, remaining;
 
-  // Contains the portion of duration_ms < 1 sec.
-  sleep_time.tv_nsec = duration_ms * 1000 * 1000;  // nanoseconds.
+  // Break the duration into seconds and nanoseconds.
+  // NOTE: TimeDelta's microseconds are int64s while timespec's
+  // nanoseconds are longs, so this unpacking must prevent overflow.
+  sleep_time.tv_sec = duration.InSeconds();
+  duration -= TimeDelta::FromSeconds(sleep_time.tv_sec);
+  sleep_time.tv_nsec = duration.InMicroseconds() * 1000;  // nanoseconds
 
   while (nanosleep(&sleep_time, &remaining) == -1 && errno == EINTR)
     sleep_time = remaining;