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/*
* Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2021, Azul Systems, Inc. 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_THREADS_HPP
#define SHARE_RUNTIME_THREADS_HPP
#include "jni.h"
#include "utilities/exceptions.hpp"
#include "utilities/globalDefinitions.hpp"
#include "utilities/macros.hpp"
class JavaThread;
class Metadata;
class Thread;
class ThreadClosure;
class ThreadsList;
class outputStream;
class CodeBlobClosure;
class MetadataClosure;
class OopClosure;
// The active thread queue. It also keeps track of the current used
// thread priorities.
class Threads: AllStatic {
friend class VMStructs;
private:
static int _number_of_threads;
static int _number_of_non_daemon_threads;
static int _return_code;
static uintx _thread_claim_token;
#ifdef ASSERT
static bool _vm_complete;
#endif
static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS);
static void initialize_jsr292_core_classes(TRAPS);
public:
// Thread management
// force_daemon is a concession to JNI, where we may need to add a
// thread to the thread list before allocating its thread object
static void add(JavaThread* p, bool force_daemon = false);
static void remove(JavaThread* p, bool is_daemon);
static void non_java_threads_do(ThreadClosure* tc);
static void java_threads_do(ThreadClosure* tc);
static void threads_do(ThreadClosure* tc);
static void possibly_parallel_threads_do(bool is_par, ThreadClosure* tc);
// Initializes the vm and creates the vm thread
static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
static void convert_vm_init_libraries_to_agents();
static void create_vm_init_libraries();
static void create_vm_init_agents();
static void shutdown_vm_agents();
static void destroy_vm();
// Supported VM versions via JNI
// Includes JNI_VERSION_1_1
static jboolean is_supported_jni_version_including_1_1(jint version);
// Does not include JNI_VERSION_1_1
static jboolean is_supported_jni_version(jint version);
// The "thread claim token" provides a way for threads to be claimed
// by parallel worker tasks.
//
// Each thread contains a "token" field. A task will claim the
// thread only if its token is different from the global token,
// which is updated by calling change_thread_claim_token(). When
// a thread is claimed, it's token is set to the global token value
// so other threads in the same iteration pass won't claim it.
//
// For this to work change_thread_claim_token() needs to be called
// exactly once in sequential code before starting parallel tasks
// that should claim threads.
//
// New threads get their token set to 0 and change_thread_claim_token()
// never sets the global token to 0.
static uintx thread_claim_token() { return _thread_claim_token; }
static void change_thread_claim_token();
static void assert_all_threads_claimed() NOT_DEBUG_RETURN;
// Apply "f->do_oop" to all root oops in all threads.
// This version may only be called by sequential code.
static void oops_do(OopClosure* f, CodeBlobClosure* cf);
// This version may be called by sequential or parallel code.
static void possibly_parallel_oops_do(bool is_par, OopClosure* f, CodeBlobClosure* cf);
// RedefineClasses support
static void metadata_do(MetadataClosure* f);
static void metadata_handles_do(void f(Metadata*));
#ifdef ASSERT
static bool is_vm_complete() { return _vm_complete; }
#endif // ASSERT
// Verification
static void verify();
static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks, bool print_extended_info);
static void print(bool print_stacks, bool internal_format) {
// this function is only used by debug.cpp
print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */, false /* simple format */);
}
static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
static void print_on_error(Thread* this_thread, outputStream* st, Thread* current, char* buf,
int buflen, bool* found_current);
static void print_threads_compiling(outputStream* st, char* buf, int buflen, bool short_form = false);
// Get Java threads that are waiting to enter a monitor.
static GrowableArray<JavaThread*>* get_pending_threads(ThreadsList * t_list,
int count, address monitor);
// Get owning Java thread from the monitor's owner field.
static JavaThread *owning_thread_from_monitor_owner(ThreadsList * t_list,
address owner);
static JavaThread* owning_thread_from_monitor(ThreadsList* t_list, ObjectMonitor* owner);
// Number of threads on the active threads list
static int number_of_threads() { return _number_of_threads; }
// Number of non-daemon threads on the active threads list
static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
struct Test; // For private gtest access.
};
#endif // SHARE_RUNTIME_THREADS_HPP
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