Testing that waiting for a condition variable waits.

webrtc/system_wrappers/source/condition_variable_unittest.cc

Index: webrtc/system_wrappers/source/condition_variable_unittest.cc
diff --git a/webrtc/system_wrappers/source/condition_variable_unittest.cc b/webrtc/system_wrappers/source/condition_variable_unittest.cc
index c34c4ea0d8b437852e6105c11dc5cb5ef40b2691..6e8a1ec3b57d4c8639a95420c69f4e73547b13d3 100644
--- a/webrtc/system_wrappers/source/condition_variable_unittest.cc
+++ b/webrtc/system_wrappers/source/condition_variable_unittest.cc
@@ -11,8 +11,10 @@
 #include "webrtc/system_wrappers/interface/condition_variable_wrapper.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
+#include "webrtc/base/scoped_ptr.h"
 #include "webrtc/system_wrappers/interface/critical_section_wrapper.h"
 #include "webrtc/system_wrappers/interface/thread_wrapper.h"
+#include "webrtc/system_wrappers/interface/tick_util.h"
 #include "webrtc/system_wrappers/interface/trace.h"
 
 namespace webrtc {
@@ -21,6 +23,7 @@ namespace {
 
 const int kLongWaitMs = 100 * 1000; // A long time in testing terms
 const int kShortWaitMs = 2 * 1000; // Long enough for process switches to happen
+const int kVeryShortWaitMs = 20; // Used when we want a timeout
 
 // A Baton is one possible control structure one can build using
 // conditional variables.
@@ -184,6 +187,19 @@ TEST_F(CondVarTest, DISABLED_PassBatonMultipleTimes) {
   EXPECT_EQ(2 * kNumberOfRounds, baton_.PassCount());
 }
 
+TEST(CondVarWaitTest, WaitingWaits) {
+  rtc::scoped_ptr<CriticalSectionWrapper> crit_sect(
+      CriticalSectionWrapper::CreateCriticalSection());
+  rtc::scoped_ptr<ConditionVariableWrapper> cond_var(
+      ConditionVariableWrapper::CreateConditionVariable());
+  CriticalSectionScoped cs(crit_sect.get());
+  int64_t start_ms = TickTime::MillisecondTimestamp();
+  EXPECT_FALSE(cond_var->SleepCS(*(crit_sect), kVeryShortWaitMs));
+  int64_t end_ms = TickTime::MillisecondTimestamp();
+  EXPECT_LE(start_ms + kVeryShortWaitMs, end_ms)
+      << "actual elapsed:" << end_ms - start_ms;
+}
+
 }  // anonymous namespace
 
 }  // namespace webrtc