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comparison src/share/vm/runtime/os.hpp @ 10405:f2110083203d

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8005849: JEP 167: Event-Based JVM Tracing Reviewed-by: acorn, coleenp, sla Contributed-by: Karen Kinnear <karen.kinnear@oracle.com>, Bengt Rutisson <bengt.rutisson@oracle.com>, Calvin Cheung <calvin.cheung@oracle.com>, Erik Gahlin <erik.gahlin@oracle.com>, Erik Helin <erik.helin@oracle.com>, Jesper Wilhelmsson <jesper.wilhelmsson@oracle.com>, Keith McGuigan <keith.mcguigan@oracle.com>, Mattias Tobiasson <mattias.tobiasson@oracle.com>, Markus Gronlund <markus.gronlund@oracle.com>, Mikael Auno <mikael.auno@oracle.com>, Nils Eliasson <nils.eliasson@oracle.com>, Nils Loodin <nils.loodin@oracle.com>, Rickard Backman <rickard.backman@oracle.com>, Staffan Larsen <staffan.larsen@oracle.com>, Stefan Karlsson <stefan.karlsson@oracle.com>, Yekaterina Kantserova <yekaterina.kantserova@oracle.com>
author sla
date Mon, 10 Jun 2013 11:30:51 +0200
parents c18152e0554e
children 836a62f43af9 a837fa3d3f86
comparison
equal deleted inserted replaced
10404:d0add7016434 10405:f2110083203d
779 // Causes the VM to wait until an external stimulus has been applied 779 // Causes the VM to wait until an external stimulus has been applied
780 // (for Unix, that stimulus is a signal, for Windows, an external 780 // (for Unix, that stimulus is a signal, for Windows, an external
781 // ResumeThread call) 781 // ResumeThread call)
782 static void pause(); 782 static void pause();
783 783
784 class SuspendedThreadTaskContext {
785 public:
786 SuspendedThreadTaskContext(Thread* thread, void *ucontext) : _thread(thread), _ucontext(ucontext) {}
787 Thread* thread() const { return _thread; }
788 void* ucontext() const { return _ucontext; }
789 private:
790 Thread* _thread;
791 void* _ucontext;
792 };
793
794 class SuspendedThreadTask {
795 public:
796 SuspendedThreadTask(Thread* thread) : _thread(thread), _done(false) {}
797 virtual ~SuspendedThreadTask() {}
798 void run();
799 bool is_done() { return _done; }
800 virtual void do_task(const SuspendedThreadTaskContext& context) = 0;
801 protected:
802 private:
803 void internal_do_task();
804 Thread* _thread;
805 bool _done;
806 };
807
808 #ifndef TARGET_OS_FAMILY_windows
809 // Suspend/resume support
810 // Protocol:
811 //
812 // a thread starts in SR_RUNNING
813 //
814 // SR_RUNNING can go to
815 // * SR_SUSPEND_REQUEST when the WatcherThread wants to suspend it
816 // SR_SUSPEND_REQUEST can go to
817 // * SR_RUNNING if WatcherThread decides it waited for SR_SUSPENDED too long (timeout)
818 // * SR_SUSPENDED if the stopped thread receives the signal and switches state
819 // SR_SUSPENDED can go to
820 // * SR_WAKEUP_REQUEST when the WatcherThread has done the work and wants to resume
821 // SR_WAKEUP_REQUEST can go to
822 // * SR_RUNNING when the stopped thread receives the signal
823 // * SR_WAKEUP_REQUEST on timeout (resend the signal and try again)
824 class SuspendResume {
825 public:
826 enum State {
827 SR_RUNNING,
828 SR_SUSPEND_REQUEST,
829 SR_SUSPENDED,
830 SR_WAKEUP_REQUEST
831 };
832
833 private:
834 volatile State _state;
835
836 private:
837 /* try to switch state from state "from" to state "to"
838 * returns the state set after the method is complete
839 */
840 State switch_state(State from, State to);
841
842 public:
843 SuspendResume() : _state(SR_RUNNING) { }
844
845 State state() const { return _state; }
846
847 State request_suspend() {
848 return switch_state(SR_RUNNING, SR_SUSPEND_REQUEST);
849 }
850
851 State cancel_suspend() {
852 return switch_state(SR_SUSPEND_REQUEST, SR_RUNNING);
853 }
854
855 State suspended() {
856 return switch_state(SR_SUSPEND_REQUEST, SR_SUSPENDED);
857 }
858
859 State request_wakeup() {
860 return switch_state(SR_SUSPENDED, SR_WAKEUP_REQUEST);
861 }
862
863 State running() {
864 return switch_state(SR_WAKEUP_REQUEST, SR_RUNNING);
865 }
866
867 bool is_running() const {
868 return _state == SR_RUNNING;
869 }
870
871 bool is_suspend_request() const {
872 return _state == SR_SUSPEND_REQUEST;
873 }
874
875 bool is_suspended() const {
876 return _state == SR_SUSPENDED;
877 }
878 };
879 #endif
880
881
784 protected: 882 protected:
785 static long _rand_seed; // seed for random number generator 883 static long _rand_seed; // seed for random number generator
786 static int _processor_count; // number of processors 884 static int _processor_count; // number of processors
787 885
788 static char* format_boot_path(const char* format_string, 886 static char* format_boot_path(const char* format_string,