X-Git-Url: http://plrg.eecs.uci.edu/git/?p=folly.git;a=blobdiff_plain;f=folly%2Ftest%2FFutexTest.cpp;h=b64238b6274db2e8702509574f76805899b967dd;hp=24cd175625758281d893dae811202c4872c0ab22;hb=c27b2745b98c3266cd10249cb1b1642ea381ad50;hpb=ee87051bba16d2c98a1871450ff390924d66a4df

diff --git a/folly/test/FutexTest.cpp b/folly/test/FutexTest.cpp
index 24cd1756..b64238b6 100644
--- a/folly/test/FutexTest.cpp
+++ b/folly/test/FutexTest.cpp
@@ -184,17 +184,19 @@ void run_steady_clock_test() {
 
 template <template <typename> class Atom>
 void run_wake_blocked_test() {
-  Futex<Atom> f(0);
-
-  auto thr = DSched::thread([&] { EXPECT_TRUE(f.futexWait(0)); });
-
-  // A sleep here guarantees to a large extent that 'thr' will execute
-  // futexWait before we wake it up, thus testing late futexWake.
-  std::this_thread::sleep_for(std::chrono::milliseconds(2));
-
-  f.store(1);
-  f.futexWake(1);
-  DSched::join(thr);
+  for (auto delay = std::chrono::milliseconds(1);; delay *= 2) {
+    bool success = false;
+    Futex<Atom> f(0);
+    auto thr = DSched::thread([&] { success = f.futexWait(0); });
+    /* sleep override */ std::this_thread::sleep_for(delay);
+    f.store(1);
+    f.futexWake(1);
+    DSched::join(thr);
+    LOG(INFO) << "delay=" << delay.count() << "_ms, success=" << success;
+    if (success) {
+      break;
+    }
+  }
 }
 
 TEST(Futex, clock_source) {