1 files changed, 7 insertions, 7 deletions
diff --git a/runtime/thread_linux.cc b/runtime/thread_linux.cc
index 0284364..0526f49 100644
--- a/runtime/thread_linux.cc
+++ b/runtime/thread_linux.cc
@@ -50,26 +50,26 @@ void Thread::SetUpAlternateSignalStack() {
   ss.ss_sp = new uint8_t[kHostAltSigStackSize];
   ss.ss_size = kHostAltSigStackSize;
   ss.ss_flags = 0;
-  CHECK(ss.ss_sp != NULL);
-  SigAltStack(&ss, NULL);
+  CHECK(ss.ss_sp != nullptr);
+  SigAltStack(&ss, nullptr);
 
   // Double-check that it worked.
-  ss.ss_sp = NULL;
-  SigAltStack(NULL, &ss);
+  ss.ss_sp = nullptr;
+  SigAltStack(nullptr, &ss);
   VLOG(threads) << "Alternate signal stack is " << PrettySize(ss.ss_size) << " at " << ss.ss_sp;
 }
 
 void Thread::TearDownAlternateSignalStack() {
   // Get the pointer so we can free the memory.
   stack_t ss;
-  SigAltStack(NULL, &ss);
+  SigAltStack(nullptr, &ss);
   uint8_t* allocated_signal_stack = reinterpret_cast<uint8_t*>(ss.ss_sp);
 
   // Tell the kernel to stop using it.
-  ss.ss_sp = NULL;
+  ss.ss_sp = nullptr;
   ss.ss_flags = SS_DISABLE;
   ss.ss_size = kHostAltSigStackSize;  // Avoid ENOMEM failure with Mac OS' buggy libc.
-  SigAltStack(&ss, NULL);
+  SigAltStack(&ss, nullptr);
 
   // Free it.
   delete[] allocated_signal_stack;