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rev 12346 : 8169373: Work around linux NPTL stack guard error.
Summary: Also skip libc guard page for compiler thread, merge similar code on linux platforms, and streamline libc guard page handling on linuxs390, linuxppc, aixppc.
Reviewed-by: dholmes, dcubed

@@ -138,10 +138,13 @@
   static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
   // libpthread version string
   static void libpthread_init();
+  // Return default libc guard size for the specified thread type.
+  static size_t default_guard_size(os::ThreadType thr_type);
   // Function returns true if we run on OS/400 (pase), false if we run
   // on AIX.
   static bool on_pase() {
     assert(_on_pase != -1, "not initialized");
     return _on_pase ? true : false;
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