338 lines
12 KiB
C++
338 lines
12 KiB
C++
/*
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* Copyright (c) 2021, 2024, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include <string.h>
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#include "jvmti.h"
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#include "jvmti_common.hpp"
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#include "jvmti_thread.hpp"
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extern "C" {
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/* ============================================================================= */
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#define VTHREAD_CNT 20
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static const char* CTHREAD_NAME_START = "ForkJoinPool";
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static const int CTHREAD_NAME_START_LEN = (int)strlen("ForkJoinPool");
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static jvmtiEnv *jvmti = nullptr;
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static jrawMonitorID agent_event_lock = nullptr;
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static volatile jthread agent_thread = nullptr;
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static jthread tested_vthreads[VTHREAD_CNT];
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static int vthread_no = 0;
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static jint
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get_cthreads(JNIEnv* jni, jthread** cthreads_p) {
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jthread* tested_cthreads = nullptr;
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jint all_cnt = 0;
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jint ct_cnt = 0;
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jvmtiError err = jvmti->GetAllThreads(&all_cnt, &tested_cthreads);
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check_jvmti_status(jni, err, "get_cthreads: error in JVMTI GetAllThreads");
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for (int idx = 0; idx < all_cnt; idx++) {
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jthread thread = tested_cthreads[idx];
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char* tname = get_thread_name(jvmti, jni, thread);
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if (strncmp(tname, CTHREAD_NAME_START, CTHREAD_NAME_START_LEN) != 0) {
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continue;
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}
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tested_cthreads[ct_cnt++] = thread;
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deallocate(jvmti, jni, (void*)tname);
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}
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*cthreads_p = tested_cthreads;
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return ct_cnt;
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}
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static void
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check_suspended_state(JNIEnv* jni, jthread thread, int thr_idx, char* tname, const char* func_name) {
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void *thread_p = (void*)thread;
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jint state = 0;
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jvmtiError err = jvmti->GetThreadState(thread, &state);
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check_jvmti_status(jni, err, "check_suspended_state: error in JVMTI GetThreadState");
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LOG("## Agent: thread[%d] %p %s: state after suspend: %s (%d)\n",
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thr_idx, thread_p, tname, TranslateState(state), (int)state);
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if ((state & (JVMTI_THREAD_STATE_SUSPENDED | JVMTI_THREAD_STATE_TERMINATED)) == 0) {
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LOG("\n## Agent: FAILED: %s did not turn on SUSPENDED flag:\n"
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"# state: %s (%d)\n\n", func_name, TranslateState(state), (int)state);
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set_agent_fail_status();
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}
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}
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static void
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check_resumed_state(JNIEnv* jni, jthread thread, int thr_idx, char* tname, const char* func_name) {
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void *thread_p = (void*)thread;
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jint state = 0;
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jvmtiError err = jvmti->GetThreadState(thread, &state);
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check_jvmti_status(jni, err, "check_resumed_state: error in JVMTI GetThreadState");
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LOG("## Agent: thread[%d] %p %s: state after resume: %s (%d)\n",
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thr_idx, thread_p, tname, TranslateState(state), (int)state);
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if (!((state & (JVMTI_THREAD_STATE_SUSPENDED | JVMTI_THREAD_STATE_TERMINATED)) == 0)) {
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LOG("\n## Agent: FAILED: %s did not turn off SUSPENDED flag:\n"
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"# state: %s (%d)\n\n", func_name, TranslateState(state), (int)state);
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set_agent_fail_status();
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}
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}
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static void
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test_vthread_suspend_all(JNIEnv* jni, const jthread* thread_list, int suspend_mask) {
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LOG("\n## Agent: test_vthread_suspend_all started\n");
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const jint EXCLUDE_CNT = 2;
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jthread exclude_list[EXCLUDE_CNT] = { nullptr, nullptr };
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for (int idx = 0; idx < EXCLUDE_CNT; idx++) {
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exclude_list[idx] = thread_list[idx];
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}
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jvmtiError err = jvmti->SuspendAllVirtualThreads(EXCLUDE_CNT, exclude_list);
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check_jvmti_status(jni, err, "test_vthread_suspend_all: error in JVMTI SuspendAllVirtualThreads");
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for (int idx = 0; idx < VTHREAD_CNT; idx++) {
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jthread thread = thread_list[idx];
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char* tname = get_thread_name(jvmti, jni, thread);
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if (idx < EXCLUDE_CNT && ((1 << idx) & suspend_mask) == 0) {
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// thread is in exclude list and initially resumed: expected to remain resumed
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check_resumed_state(jni, thread, idx, tname, "SuspendAllVirtualThreads");
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err = jvmti->SuspendThread(thread);
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check_jvmti_status(jni, err, "test_vthread_suspend_all: error in JVMTI SuspendThread");
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} else {
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// thread is not in exclude list or was initially suspended: expected to be suspended
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check_suspended_state(jni, thread, idx, tname, "SuspendAllVirtualThreads");
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}
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deallocate(jvmti, jni, (void*)tname);
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}
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LOG("\n## Agent: test_vthread_suspend_all finished\n");
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}
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static void
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test_vthread_resume_all(JNIEnv* jni, const jthread* thread_list, int suspend_mask) {
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LOG("\n## Agent: test_vthread_resume_all started\n");
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const jint EXCLUDE_CNT = 2;
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jthread exclude_list[EXCLUDE_CNT] = { nullptr, nullptr };
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for (int idx = 0; idx < EXCLUDE_CNT; idx++) {
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exclude_list[idx] = thread_list[idx];
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}
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jvmtiError err = jvmti->ResumeAllVirtualThreads(EXCLUDE_CNT, exclude_list);
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check_jvmti_status(jni, err, "test_vthread_resume_all: error in JVMTI ResumeAllVirtualThreads");
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for (int idx = 0; idx < VTHREAD_CNT; idx++) {
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jthread thread = thread_list[idx];
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char* tname = get_thread_name(jvmti, jni, thread);
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// The exclude list consists of vthreads #0 and #1, so these two vthreads were not resumed.
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// If they expected to be suspended then resume them explicitly here.
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if (idx < EXCLUDE_CNT && ((1 << idx) & suspend_mask) != 0) {
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// thread is in exclude list and suspended: expected to remain suspended
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check_suspended_state(jni, thread, idx, tname, "ResumeAllVirtualThreads");
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err = jvmti->ResumeThread(thread); // now resume the thread from exclude list
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check_jvmti_status(jni, err, "test_vthread_resume_all: error in JVMTI ResumeThread");
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}
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// thread is expected to be resumed now
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check_resumed_state(jni, thread, idx, tname, "ResumeAllVirtualThreads");
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deallocate(jvmti, jni, (void*)tname);
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}
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LOG("\n## Agent: test_vthread_resume_all: finished\n");
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}
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static void
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test_vthread_suspend_half(JNIEnv* jni, const jthread* thread_list) {
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jvmtiError err;
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LOG("\n## Agent: test_vthread_suspend_half started\n");
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for (int idx = 0; idx < VTHREAD_CNT; idx++) {
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if (idx % 2 == 1) {
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continue; // skip odd indeces
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}
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jthread thread = thread_list[idx];
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char* tname = get_thread_name(jvmti, jni, thread);
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err = jvmti->SuspendThread(thread);
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check_jvmti_status(jni, err, "test_vthread_suspend_half: error in JVMTI SuspendThread");
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check_suspended_state(jni, thread, idx, tname, "SuspendThread");
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deallocate(jvmti, jni, (void*)tname);
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}
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LOG("\n## Agent: test_vthread_suspend_half finished\n");
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}
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static void
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test_vthread_resume_half(JNIEnv* jni, const jthread* thread_list) {
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jvmtiError err;
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LOG("\n## Agent: test_vthread_resume_half started\n");
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for (int idx = 0; idx < VTHREAD_CNT; idx++) {
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if (idx % 2 == 1) {
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continue; // skip odd indeces
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}
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jthread thread = thread_list[idx];
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char* tname = get_thread_name(jvmti, jni, thread);
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err = jvmti->ResumeThread(thread);
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check_jvmti_status(jni, err, "test_vthread_resume_half: error in JVMTI ResumeThread");
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check_resumed_state(jni, thread, idx, tname, "ResumeThread");
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deallocate(jvmti, jni, (void*)tname);
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}
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LOG("\n## Agent: test_vthread_resume_half: finished\n");
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}
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static void
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check_threads_resumed_state(JNIEnv* jni, const jthread* thread_list, int thread_cnt) {
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LOG("\n## Agent: check_threads_resumed_state started\n");
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for (int idx = 0; idx < thread_cnt; idx++) {
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jthread thread = thread_list[idx];
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char* tname = get_thread_name(jvmti, jni, thread);
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check_resumed_state(jni, thread, idx, tname, "<Final-Sanity-Check>");
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deallocate(jvmti, jni, (void*)tname);
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}
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LOG("\n## Agent: check_threads_resumed_state: finished\n");
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}
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JNIEXPORT void JNICALL
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Java_SuspendResume2_TestSuspendResume(JNIEnv* jni, jclass cls) {
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jthread* tested_cthreads = nullptr;
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LOG("\n## TestSuspendResume: started\n");
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test_vthread_suspend_all(jni, tested_vthreads, 0x0);
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test_vthread_resume_all(jni, tested_vthreads, 0xFFFFFFFF);
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test_vthread_suspend_half(jni, tested_vthreads);
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test_vthread_resume_all(jni, tested_vthreads, 0x55555555);
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test_vthread_suspend_all(jni, tested_vthreads, 0x0);
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test_vthread_resume_half(jni, tested_vthreads);
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test_vthread_resume_all(jni, tested_vthreads, 0xAAAAAAAA);
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LOG("\n\n## TestSuspendResume: Check all virtual threads are resumed\n");
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check_threads_resumed_state(jni, tested_vthreads, VTHREAD_CNT);
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LOG("\n\n## TestSuspendResume: Check all carrier threads are resumed\n");
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jint cthread_cnt = get_cthreads(jni, &tested_cthreads);
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check_threads_resumed_state(jni, tested_cthreads, cthread_cnt);
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for (int i = 0; i < VTHREAD_CNT; i++) {
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jni->DeleteGlobalRef(tested_vthreads[i]);
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}
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LOG("\n## TestSuspendResume: finished\n");
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}
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static void JNICALL
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VirtualThreadStart(jvmtiEnv *jvmti, JNIEnv *jni, jthread vthread) {
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RawMonitorLocker agent_start_locker(jvmti, jni, agent_event_lock);
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tested_vthreads[vthread_no++] = jni->NewGlobalRef(vthread);
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}
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JNIEXPORT jint JNICALL
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Java_SuspendResume2_GetStatus(JNIEnv* jni, jclass cls) {
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return get_agent_status();
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}
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jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
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jvmtiError err;
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LOG("Agent init started\n");
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/* create JVMTI environment */
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if (jvm->GetEnv((void **)(&jvmti), JVMTI_VERSION) != JNI_OK) {
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LOG("Agent init: error in getting JvmtiEnv with GetEnv\n");
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return JNI_ERR;
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}
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err = init_agent_data(jvmti, &agent_data);
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if (err != JVMTI_ERROR_NONE) {
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LOG("Agent init: error in init_agent_data: %s (%d)\n",
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TranslateError(err), err);
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return JNI_ERR;
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}
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/* add specific capabilities for suspending thread */
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jvmtiCapabilities suspendCaps;
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jvmtiEventCallbacks callbacks;
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memset(&suspendCaps, 0, sizeof(suspendCaps));
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suspendCaps.can_suspend = 1;
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suspendCaps.can_support_virtual_threads = 1;
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err = jvmti->AddCapabilities(&suspendCaps);
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if (err != JVMTI_ERROR_NONE) {
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LOG("Agent init: error in JVMTI AddCapabilities: %s (%d)\n",
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TranslateError(err), err);
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set_agent_fail_status();
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return JNI_ERR;
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}
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memset(&callbacks, 0, sizeof(callbacks));
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callbacks.VirtualThreadStart = &VirtualThreadStart;
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err = jvmti->SetEventCallbacks(&callbacks, sizeof(jvmtiEventCallbacks));
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if (err != JVMTI_ERROR_NONE) {
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LOG("Agent init: error in JVMTI SetEventCallbacks: %s (%d)\n",
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TranslateError(err), err);
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set_agent_fail_status();
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return JNI_ERR;
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}
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err = jvmti->SetEventNotificationMode(JVMTI_ENABLE,
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JVMTI_EVENT_VIRTUAL_THREAD_START, nullptr);
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if (err != JVMTI_ERROR_NONE) {
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LOG("Agent init: error in JVMTI SetEventNotificationMode: %s (%d)\n",
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TranslateError(err), err);
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set_agent_fail_status();
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return JNI_ERR;
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}
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agent_event_lock = create_raw_monitor(jvmti, "_agent_event_lock");
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LOG("Agent init finished\n");
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return JNI_OK;
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}
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/** Agent library initialization. */
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JNIEXPORT jint JNICALL Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) {
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return Agent_Initialize(jvm, options, reserved);
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}
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JNIEXPORT jint JNICALL Agent_OnAttach(JavaVM *jvm, char *options, void *reserved) {
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return Agent_Initialize(jvm, options, reserved);
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}
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}
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