Sampling profiler

runtime/bin/utils_linux.cc

Index: runtime/bin/utils_linux.cc
diff --git a/runtime/bin/utils_linux.cc b/runtime/bin/utils_linux.cc
index 66e6929371936be9c7595e94f094a8fab0acdc06..4506f6f2b27aab964ba1d62a685c8b25850dbb6f 100644
--- a/runtime/bin/utils_linux.cc
+++ b/runtime/bin/utils_linux.cc
@@ -96,7 +96,17 @@ int64_t TimerUtils::GetCurrentTimeMicros() {
 }
 
 void TimerUtils::Sleep(int64_t millis) {
-  usleep(millis * 1000);
+  // We must loop here because SIGPROF will interrupt usleep.
+  int64_t micros = millis * 1000;
+  int64_t start = GetCurrentTimeMicros();
+  while (micros > 0) {
+    usleep(micros);
+    int64_t now = GetCurrentTimeMicros();
+    int64_t delta = now - start;
+    ASSERT(delta >= 0);
+    start = now;
+    micros -= delta;
+  }
 }
 
 }  // namespace bin