rev 48162 : 8191789: migrate more Thread-SMR stuff from thread.[ch]pp -> threadSMR.[ch]pp
Reviewed-by: stefank
rev 48163 : CR round 0: dcubed - move more code into sort order, add update_smr_tlh_stats(); stefank - refactor Threads::add() and Threads::remove() to allow more ThreadsSMRSupport functions to be private, move is_a_protected_JavaThread_with_lock() to threadSMR.inline.hpp

   1 /*
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   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
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  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
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  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
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  24 
  25 #ifndef SHARE_VM_RUNTIME_THREADSMR_INLINE_HPP
  26 #define SHARE_VM_RUNTIME_THREADSMR_INLINE_HPP
  27 
  28 #include "runtime/atomic.hpp"
  29 #include "runtime/prefetch.inline.hpp"
  30 #include "runtime/thread.inline.hpp"
  31 #include "runtime/threadSMR.hpp"
  32 
  33 // Devirtualize known thread closure types.
  34 template <class T>
  35 inline void ThreadsList::threads_do_dispatch(T *cl, JavaThread *const thread) const {
  36   cl->T::do_thread(thread);
  37 }
  38 
  39 template <>
  40 inline void ThreadsList::threads_do_dispatch<ThreadClosure>(ThreadClosure *cl, JavaThread *const thread) const {
  41   cl->do_thread(thread);
  42 }
  43 
  44 template <class T>
  45 inline void ThreadsList::threads_do(T *cl) const {
  46   const intx scan_interval = PrefetchScanIntervalInBytes;
  47   JavaThread *const *const end = _threads + _length;
  48   for (JavaThread *const *current_p = _threads; current_p != end; current_p++) {
  49     Prefetch::read((void*)current_p, scan_interval);
  50     JavaThread *const current = *current_p;
  51     threads_do_dispatch(cl, current);
  52   }
  53 }
  54 
  55 // These three inlines are private to ThreadsSMRSupport, but
  56 // they are called by public inline update_smr_tlh_stats() below:
  57 
  58 inline void ThreadsSMRSupport::add_smr_tlh_times(uint add_value) {
  59   Atomic::add(add_value, &_smr_tlh_times);
  60 }
  61 
  62 inline void ThreadsSMRSupport::inc_smr_tlh_cnt() {
  63   Atomic::inc(&_smr_tlh_cnt);
  64 }
  65 
  66 inline void ThreadsSMRSupport::update_smr_tlh_time_max(uint new_value) {
  67   while (true) {
  68     uint cur_value = _smr_tlh_time_max;
  69     if (new_value <= cur_value) {
  70       // No need to update max value so we're done.
  71       break;
  72     }
  73     if (Atomic::cmpxchg(new_value, &_smr_tlh_time_max, cur_value) == cur_value) {
  74       // Updated max value so we're done. Otherwise try it all again.
  75       break;
  76     }
  77   }
  78 }
  79 
  80 
  81 inline ThreadsList* ThreadsListSetter::list() {
  82   ThreadsList *ret = _target->get_threads_hazard_ptr();
  83   assert(ret != NULL, "hazard ptr should be set");
  84   assert(!Thread::is_hazard_ptr_tagged(ret), "hazard ptr should be validated");
  85   return ret;
  86 }
  87 
  88 inline ThreadsList* ThreadsSMRSupport::get_smr_java_thread_list() {
  89   return (ThreadsList*)OrderAccess::load_acquire(&_smr_java_thread_list);
  90 }
  91 
  92 inline bool ThreadsSMRSupport::is_a_protected_JavaThread_with_lock(JavaThread *thread) {
  93   MutexLockerEx ml(Threads_lock->owned_by_self() ? NULL : Threads_lock);
  94   return is_a_protected_JavaThread(thread);
  95 }
  96 
  97 inline void ThreadsSMRSupport::update_smr_tlh_stats(uint millis) {
  98   ThreadsSMRSupport::inc_smr_tlh_cnt();
  99   ThreadsSMRSupport::add_smr_tlh_times(millis);
 100   ThreadsSMRSupport::update_smr_tlh_time_max(millis);
 101 }
 102 
 103 #endif // SHARE_VM_RUNTIME_THREADSMR_INLINE_HPP
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