Sampling profiler

runtime/bin/utils_macos.cc

Index: runtime/bin/utils_macos.cc
diff --git a/runtime/bin/utils_macos.cc b/runtime/bin/utils_macos.cc
index c47feddf830425eec9c97a6cbbe5720b65bd5ce1..1c83afd508465f482d5f828bb6f4111e1230fa19 100644
--- a/runtime/bin/utils_macos.cc
+++ b/runtime/bin/utils_macos.cc
@@ -98,7 +98,17 @@ 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