commit 1532476b2245e509f6fa2d91526a775468de5cfc
author Alex Light <allight@google.com> Thu Nov 19 11:03:10 2015 -0800
committer Alex Light <allight@google.com> Thu Nov 19 17:38:48 2015 -0800
tree 1ec2c2a97ae5c2802e6a37749c995a3cb83ffdfb
parent 16cabc4acd14d5a61c73cef821162e1827f08788

Use arc4random when available to select delta for image relocation.

Bug: 25776162

Change-Id: I5a5ca5d55c231508b61d4960049ab42e19c017e2

runtime/gc/space/image_space.cc

diff --git a/runtime/gc/space/image_space.cc b/runtime/gc/space/image_space.cc
index 1fe9a03..e2b2431 100644
--- a/runtime/gc/space/image_space.cc
+++ b/runtime/gc/space/image_space.cc
@@ -58,10 +58,7 @@
   CHECK_ALIGNED(max_delta, kPageSize);
   CHECK_LT(min_delta, max_delta);
 
-  std::default_random_engine generator;
-  generator.seed(NanoTime() * getpid());
-  std::uniform_int_distribution<int32_t> distribution(min_delta, max_delta);
-  int32_t r = distribution(generator);
+  int32_t r = GetRandomNumber<int32_t>(min_delta, max_delta);
   if (r % 2 == 0) {
     r = RoundUp(r, kPageSize);
   } else {