Sampling profiler

runtime/bin/utils_linux.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_LINUX)
 
 #include <errno.h>  // NOLINT
 #include <netdb.h>  // NOLINT
 #include <sys/time.h>  // NOLINT
@@ skipping 78 matching lines @@
 int64_t TimerUtils::GetCurrentTimeMicros() {
   struct timeval tv;
   if (gettimeofday(&tv, NULL) < 0) {
     UNREACHABLE();
     return 0;
   }
   return (static_cast<int64_t>(tv.tv_sec) * 1000000) + tv.tv_usec;
 }
 
 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
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_LINUX)