From 31dc737d7a01f92016ffb1eaa4fd2700690e4124 Mon Sep 17 00:00:00 2001
From: Stefan Holmer <stefan@webrtc.org>
Date: Tue, 28 Apr 2015 15:32:33 +0200
Subject: [PATCH] Platform dependent way of generating the seed for srand for
 simulations, so that they can be run in parallel.

The seed generated for Win won't be good enough to run the simulations in parallel.

R=pbos@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/49829004

Cr-Commit-Position: refs/heads/master@{#9101}
---
 .../remote_bitrate_estimators_test.cc         | 25 +++++++++++++------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/webrtc/modules/remote_bitrate_estimator/remote_bitrate_estimators_test.cc b/webrtc/modules/remote_bitrate_estimator/remote_bitrate_estimators_test.cc
index 0d9418ec20..42f4e1c2d0 100644
--- a/webrtc/modules/remote_bitrate_estimator/remote_bitrate_estimators_test.cc
+++ b/webrtc/modules/remote_bitrate_estimator/remote_bitrate_estimators_test.cc
@@ -8,6 +8,11 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
+#ifndef WEBRTC_WIN
+#include <sys/types.h>
+#include <unistd.h>
+#endif
+
 #include <sstream>
 
 #include "webrtc/modules/remote_bitrate_estimator/include/remote_bitrate_estimator.h"
@@ -241,7 +246,14 @@ class BweFeedbackTest
   virtual ~BweFeedbackTest() {}
 
  protected:
-  void SetUp() override { BweTest::SetUp(); }
+  void SetUp() override {
+    unsigned int seed = Clock::GetRealTimeClock()->TimeInMicroseconds();
+#ifndef WEBRTC_WIN
+    seed *= getpid();
+#endif
+    srand(seed);
+    BweTest::SetUp();
+  }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BweFeedbackTest);
@@ -321,28 +333,27 @@ TEST_P(BweFeedbackTest, DISABLED_GoogleWifiTrace3Mbps) {
                filter.GetDelayStats(), std::vector<Stats<double>>());
 }
 
-TEST_P(BweFeedbackTest, PacedSelfFairnessTest) {
-  srand(Clock::GetRealTimeClock()->TimeInMicroseconds());
+TEST_P(BweFeedbackTest, PacedSelfFairness50msTest) {
+  RunFairnessTest(GetParam(), 4, 0, 300, 3000, 50);
+}
+
+TEST_P(BweFeedbackTest, PacedSelfFairness500msTest) {
   RunFairnessTest(GetParam(), 4, 0, 300, 3000, 50);
 }
 
 TEST_P(BweFeedbackTest, PacedSelfFairness1000msTest) {
-  srand(Clock::GetRealTimeClock()->TimeInMicroseconds());
   RunFairnessTest(GetParam(), 4, 0, 300, 3000, 1000);
 }
 
 TEST_P(BweFeedbackTest, TcpFairness50msTest) {
-  srand(Clock::GetRealTimeClock()->TimeInMicroseconds());
   RunFairnessTest(GetParam(), 1, 1, 300, 2000, 50);
 }
 
 TEST_P(BweFeedbackTest, TcpFairness500msTest) {
-  srand(Clock::GetRealTimeClock()->TimeInMicroseconds());
   RunFairnessTest(GetParam(), 1, 1, 300, 2000, 500);
 }
 
 TEST_P(BweFeedbackTest, TcpFairness1000msTest) {
-  srand(Clock::GetRealTimeClock()->TimeInMicroseconds());
   RunFairnessTest(GetParam(), 1, 1, 300, 2000, 1000);
 }
 }  // namespace bwe