13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  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
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_RUNTIME_SAFEPOINTMECHANISM_HPP
  26 #define SHARE_VM_RUNTIME_SAFEPOINTMECHANISM_HPP
  27 
  28 #include "runtime/globals.hpp"
  29 #include "utilities/globalDefinitions.hpp"
  30 #include "utilities/macros.hpp"
  31 #include "utilities/sizes.hpp"
  32 
  33 class JavaThread;
  34 
  35 // This is the abstracted interface for the safepoint implementation
  36 class SafepointMechanism : public AllStatic {















  37   static inline bool global_poll();
  38 


  39   static void default_initialize();
  40   static void initialize_serialize_page();
  41 
  42   static void pd_initialize() NOT_AIX({ default_initialize(); });
  43 



  44 public:












  45 
  46   // Call this method to see if this thread has depending poll and appropriate action should be taken
  47   static inline bool poll();
  48 
  49   // Blocks a thread until safepoint is completed
  50   static inline void block_if_requested(JavaThread* thread);
  51 



  52   // Setup the selected safepoint mechanism
  53   static void initialize();

  54 };
  55 
  56 #endif // SHARE_VM_RUNTIME_SAFEPOINTMECHANISM_HPP

  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  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
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_RUNTIME_SAFEPOINTMECHANISM_HPP
  26 #define SHARE_VM_RUNTIME_SAFEPOINTMECHANISM_HPP
  27 
  28 #include "runtime/globals.hpp"
  29 #include "utilities/globalDefinitions.hpp"
  30 #include "utilities/macros.hpp"
  31 #include "utilities/sizes.hpp"
  32 


  33 // This is the abstracted interface for the safepoint implementation
  34 class SafepointMechanism : public AllStatic {
  35   enum PollingType {
  36     _global_page_poll,
  37     _thread_local_poll
  38   };
  39   static PollingType _polling_type;
  40   static void* _poll_armed_value;
  41   static void* _poll_disarmed_value;
  42   static void set_uses_thread_local_poll()            { _polling_type     = _thread_local_poll; }
  43 
  44   static void* poll_armed_value()                     { return _poll_armed_value; }
  45   static void* poll_disarmed_value()                  { return _poll_disarmed_value; }
  46 
  47   static inline bool local_poll_armed(JavaThread* thread);
  48 
  49   static inline bool local_poll(Thread* thread);
  50   static inline bool global_poll();
  51 
  52   static inline void block_if_requested_local_poll(JavaThread *thread);
  53 
  54   static void default_initialize();
  55   static void initialize_serialize_page();
  56 
  57   static void pd_initialize() NOT_AIX({ default_initialize(); });
  58 
  59   // By adding 8 to the base address of the protected polling page we can differentiate
  60   // between the armed and disarmed value by masking out this bit.
  61   const static intptr_t _poll_bit = 8;
  62 public:
  63   static intptr_t poll_bit() { return _poll_bit; }
  64 
  65   static bool uses_global_page_poll() { return _polling_type == _global_page_poll; }
  66   static bool uses_thread_local_poll() { return _polling_type == _thread_local_poll; }
  67 
  68   static bool supports_thread_local_poll() {
  69 #if defined(AMD64) || defined(SPARC)
  70     return true;
  71 #else
  72     return false;
  73 #endif
  74   }
  75 
  76   // Call this method to see if this thread has depending poll and appropriate action should be taken
  77   static inline bool poll(Thread* thread);
  78 
  79   // Blocks a thread until safepoint is completed
  80   static inline void block_if_requested(JavaThread* thread);
  81 
  82   static inline void arm_local_poll(JavaThread* thread);
  83   static inline void disarm_local_poll(JavaThread* thread);
  84 
  85   // Setup the selected safepoint mechanism
  86   static void initialize();
  87   static void initialize_header(JavaThread* thread);
  88 };
  89 
  90 #endif // SHARE_VM_RUNTIME_SAFEPOINTMECHANISM_HPP