mirror of
https://github.com/openjdk/jdk.git
synced 2026-02-01 05:58:29 +00:00
150 lines
4.4 KiB
C++
150 lines
4.4 KiB
C++
/*
|
|
* Copyright (c) 1998, 2024, Oracle and/or its affiliates. All rights reserved.
|
|
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
|
*
|
|
* This code is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 only, as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This code is distributed in the hope that it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
* version 2 for more details (a copy is included in the LICENSE file that
|
|
* accompanied this code).
|
|
*
|
|
* You should have received a copy of the GNU General Public License version
|
|
* 2 along with this work; if not, write to the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
|
|
* or visit www.oracle.com if you need additional information or have any
|
|
* questions.
|
|
*
|
|
*/
|
|
|
|
#ifndef SHARE_RUNTIME_VMTHREAD_HPP
|
|
#define SHARE_RUNTIME_VMTHREAD_HPP
|
|
|
|
#include "runtime/atomic.hpp"
|
|
#include "runtime/javaThread.hpp"
|
|
#include "runtime/perfDataTypes.hpp"
|
|
#include "runtime/nonJavaThread.hpp"
|
|
#include "runtime/task.hpp"
|
|
#include "runtime/vmOperation.hpp"
|
|
|
|
// VM operation timeout handling: warn or abort the VM when VM operation takes
|
|
// too long. Periodic tasks do not participate in safepoint protocol, and therefore
|
|
// can fire when application threads are stopped.
|
|
|
|
class VMOperationTimeoutTask : public PeriodicTask {
|
|
private:
|
|
volatile int _armed;
|
|
jlong _arm_time;
|
|
const char* _vm_op_name;
|
|
public:
|
|
VMOperationTimeoutTask(size_t interval_time) :
|
|
PeriodicTask(interval_time), _armed(0), _arm_time(0), _vm_op_name(nullptr) {}
|
|
|
|
virtual void task();
|
|
|
|
bool is_armed();
|
|
void arm(const char* vm_op_name);
|
|
void disarm();
|
|
};
|
|
|
|
//
|
|
// A single VMThread is used by other threads to offload heavy vm operations
|
|
// like scavenge, garbage_collect etc.
|
|
//
|
|
|
|
class VMThread: public NamedThread {
|
|
private:
|
|
volatile bool _is_running;
|
|
|
|
static ThreadPriority _current_priority;
|
|
|
|
static bool _should_terminate;
|
|
static bool _terminated;
|
|
static Monitor * _terminate_lock;
|
|
static PerfCounter* _perf_accumulated_vm_operation_time;
|
|
|
|
static VMOperationTimeoutTask* _timeout_task;
|
|
|
|
static bool handshake_or_safepoint_alot();
|
|
|
|
void evaluate_operation(VM_Operation* op);
|
|
void inner_execute(VM_Operation* op);
|
|
void wait_for_operation();
|
|
|
|
// Constructor
|
|
VMThread();
|
|
|
|
// No destruction allowed
|
|
~VMThread() {
|
|
guarantee(false, "VMThread deletion must fix the race with VM termination");
|
|
}
|
|
|
|
// The ever running loop for the VMThread
|
|
void loop();
|
|
|
|
public:
|
|
bool is_running() const { return Atomic::load(&_is_running); }
|
|
|
|
// Tester
|
|
bool is_VM_thread() const { return true; }
|
|
|
|
// Called to stop the VM thread
|
|
static void wait_for_vm_thread_exit();
|
|
static bool should_terminate() { return _should_terminate; }
|
|
static bool is_terminated() { return _terminated == true; }
|
|
|
|
// Execution of vm operation
|
|
static void execute(VM_Operation* op);
|
|
|
|
// Returns the current vm operation if any.
|
|
static VM_Operation* vm_operation() {
|
|
assert(Thread::current()->is_VM_thread(), "Must be");
|
|
return _cur_vm_operation;
|
|
}
|
|
|
|
static VM_Operation::VMOp_Type vm_op_type() {
|
|
VM_Operation* op = vm_operation();
|
|
assert(op != nullptr, "sanity");
|
|
return op->type();
|
|
}
|
|
|
|
// Returns the single instance of VMThread.
|
|
static VMThread* vm_thread() { return _vm_thread; }
|
|
|
|
void verify();
|
|
|
|
// Performance measurement
|
|
static PerfCounter* perf_accumulated_vm_operation_time() {
|
|
return _perf_accumulated_vm_operation_time;
|
|
}
|
|
|
|
// Entry for starting vm thread
|
|
virtual void run();
|
|
|
|
// Creations/Destructions
|
|
static void create();
|
|
static void destroy();
|
|
|
|
static void wait_until_executed(VM_Operation* op);
|
|
|
|
// Printing
|
|
const char* type_name() const { return "VMThread"; }
|
|
|
|
private:
|
|
// VM_Operation support
|
|
static VM_Operation* _cur_vm_operation; // Current VM operation
|
|
static VM_Operation* _next_vm_operation; // Next VM operation
|
|
|
|
bool set_next_operation(VM_Operation *op); // Set the _next_vm_operation if possible.
|
|
|
|
// Pointer to single-instance of VM thread
|
|
static VMThread* _vm_thread;
|
|
};
|
|
|
|
#endif // SHARE_RUNTIME_VMTHREAD_HPP
|