src/os/posix/vm/vmError_posix.cpp

rev 12508 : 8166944: Hanging Error Reporting steps may lead to torn error logs.
Reviewed-by: cjplummer, dholmes
Summary: Interupt error reporting if reporting steps hang to enable subsequent reporting steps to run.

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2003, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.

@@ -57,10 +57,25 @@
 
 // Space for our "saved" signal flags and handlers
 static int resettedSigflags[NUM_SIGNALS];
 static address resettedSighandler[NUM_SIGNALS];
 
+// Needed for cancelable steps.
+static volatile pthread_t reporter_thread_id;
+
+void VMError::reporting_started() {
+  // record pthread id of reporter thread.
+  reporter_thread_id = ::pthread_self();
+}
+
+void VMError::interrupt_reporting_thread() {
+  // We misuse SIGILL here, but it does not really matter. We need
+  //  a signal which is handled by crash_handler and not likely to
+  //  occurr during error reporting itself.
+  ::pthread_kill(reporter_thread_id, SIGILL);
+}
+
 static void save_signal(int idx, int sig)
 {
   struct sigaction sa;
   sigaction(sig, NULL, &sa);
   resettedSigflags[idx]   = sa.sa_flags;