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src/hotspot/share/trace/tracingExport.cpp

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rev 49672 : 8200374: Add ThreadsSMRSupport::verify_hazard_pointer_scanned() to verify threads_do().
rev 49673 : Add missing NULL check; use proper lock-free get/set with TracingExport::_sampler_thread.
rev 49674 : Rename TracingExport::get_sampler_thread() to TracingExport::sampler_thread_acquire() and TracingExport::set_sampler_thread() to TracingExport::set_sampler_thread_with_lock(); set_sampler_thread_with_lock() uses Threads_lock toavoid conflicts with Thread-SMR scans.
rev 49675 : TracingExport::set_sampler_thread_with_lock() needs to verify assumptions and to use release_store().


  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
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "runtime/orderAccess.inline.hpp"
  27 #include "trace/tracingExport.hpp"
  28 
  29 // Allow lock-free reads of _sampler_thread.
  30 Thread* volatile TracingExport::_sampler_thread = NULL;
  31 
  32 Thread* TracingExport::sampler_thread_acquire() {
  33   return (Thread*)OrderAccess::load_acquire(&_sampler_thread);
  34 }
  35 
  36 void TracingExport::set_sampler_thread_with_lock(Thread* thread) {
  37   // Grab Threads_lock to avoid conflicts with Thread-SMR scans.
  38   MutexLocker ml(Threads_lock);
  39   _sampler_thread = thread;


  40 }


  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
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "runtime/orderAccess.inline.hpp"
  27 #include "trace/tracingExport.hpp"
  28 
  29 // Allow lock-free reads of _sampler_thread.
  30 Thread* volatile TracingExport::_sampler_thread = NULL;
  31 
  32 Thread* TracingExport::sampler_thread_acquire() {
  33   return (Thread*)OrderAccess::load_acquire(&_sampler_thread);
  34 }
  35 
  36 void TracingExport::set_sampler_thread_with_lock(Thread* thread) {
  37   // Grab Threads_lock to avoid conflicts with Thread-SMR scans.
  38   MutexLocker ml(Threads_lock);
  39   assert(thread == NULL || _sampler_thread == NULL, "_sampler_thread should not already be set.");
  40   // To match with the lock-free load_acquire():
  41   OrderAccess::release_store(&_sampler_thread, thread);
  42 }
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