Added labelled thread names to help with some debugging activity. Right now,...

src/platform-linux.cc

Index: src/platform-linux.cc
===================================================================
--- src/platform-linux.cc	(revision 6114)
+++ src/platform-linux.cc	(working copy)
@@ -551,9 +551,19 @@
 
 
 Thread::Thread() : ThreadHandle(ThreadHandle::INVALID) {
+#ifdef DEBUG_THREAD_NAMES
+  SetName("v8:<unknown>");
+#endif
 }
 
 
+#ifdef DEBUG_THREAD_NAMES
+Thread::Thread(const char* name) : ThreadHandle(ThreadHandle::INVALID) {
+  SetName(name);
+}
+#endif
+
+
 Thread::~Thread() {
 }
 
@@ -563,6 +573,9 @@
   // This is also initialized by the first argument to pthread_create() but we
   // don't know which thread will run first (the original thread or the new
   // one) so we initialize it here too.
+#ifdef DEBUG_THREAD_NAMES
+  ::prctl(PR_SET_NAME, thread->Name(), 0, 0, 0);
+#endif
   thread->thread_handle_data()->thread_ = pthread_self();
   ASSERT(thread->IsValid());
   thread->Run();
@@ -570,6 +583,14 @@
 }
 
 
+#ifdef DEBUG_THREAD_NAMES
+void Thread::SetName(const char* name) {
+  strncpy(name_, name, sizeof(name_));
+  name_[sizeof(name_)-1] = '\0';
+}
+#endif
+
+
 void Thread::Start() {
   pthread_create(&thread_handle_data()->thread_, NULL, ThreadEntry, this);
   ASSERT(IsValid());