Profiler Take 2

runtime/bin/file_macos.cc

Index: runtime/bin/file_macos.cc
diff --git a/runtime/bin/file_macos.cc b/runtime/bin/file_macos.cc
index b9500a74fee98e52df71be2d6e15badbd5ea72a7..356e10bf5eb0736b76221abc49b6c8cf242bf149 100644
--- a/runtime/bin/file_macos.cc
+++ b/runtime/bin/file_macos.cc
@@ -18,7 +18,7 @@
 #include "bin/builtin.h"
 #include "bin/fdutils.h"
 #include "bin/log.h"
-
+#include "bin/signal_blocker.h"
 
 namespace dart {
 namespace bin {
@@ -66,12 +66,16 @@ bool File::IsClosed() {
 
 int64_t File::Read(void* buffer, int64_t num_bytes) {
   ASSERT(handle_->fd() >= 0);
+  // Block profile interrupts while making I/O call.
+  ThreadSignalBlocker tsb(SIGPROF);
   return TEMP_FAILURE_RETRY(read(handle_->fd(), buffer, num_bytes));
 }
 
 
 int64_t File::Write(const void* buffer, int64_t num_bytes) {
   ASSERT(handle_->fd() >= 0);
+  // Block profile interrupts while making I/O call.
+  ThreadSignalBlocker tsb(SIGPROF);
   return TEMP_FAILURE_RETRY(write(handle_->fd(), buffer, num_bytes));
 }