Alan Bateman 9583e3657e 8284161: Implementation of Virtual Threads (Preview)
Co-authored-by: Ron Pressler <rpressler@openjdk.org>
Co-authored-by: Alan Bateman <alanb@openjdk.org>
Co-authored-by: Erik Österlund <eosterlund@openjdk.org>
Co-authored-by: Andrew Haley <aph@openjdk.org>
Co-authored-by: Rickard Bäckman <rbackman@openjdk.org>
Co-authored-by: Markus Grönlund <mgronlun@openjdk.org>
Co-authored-by: Leonid Mesnik <lmesnik@openjdk.org>
Co-authored-by: Serguei Spitsyn <sspitsyn@openjdk.org>
Co-authored-by: Chris Plummer <cjplummer@openjdk.org>
Co-authored-by: Coleen Phillimore <coleenp@openjdk.org>
Co-authored-by: Robbin Ehn <rehn@openjdk.org>
Co-authored-by: Stefan Karlsson <stefank@openjdk.org>
Co-authored-by: Thomas Schatzl <tschatzl@openjdk.org>
Co-authored-by: Sergey Kuksenko <skuksenko@openjdk.org>
Reviewed-by: lancea, eosterlund, rehn, sspitsyn, stefank, tschatzl, dfuchs, lmesnik, dcubed, kevinw, amenkov, dlong, mchung, psandoz, bpb, coleenp, smarks, egahlin, mseledtsov, coffeys, darcy
2022-05-07 08:06:16 +00:00

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8.1 KiB
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/*
* Copyright (c) 2004, 2022, 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.
*/
#include <stdio.h>
#include <string.h>
#include "jvmti.h"
#include "jvmti_common.h"
extern "C" {
#define WAIT_START 100
static jvmtiEnv *jvmti = NULL;
static jrawMonitorID access_lock, wait_lock;
static jthread thr_ptr = NULL;
static jint wait_time = 0;
static jint state[] = {
JVMTI_THREAD_STATE_RUNNABLE,
JVMTI_THREAD_STATE_BLOCKED_ON_MONITOR_ENTER,
JVMTI_THREAD_STATE_IN_OBJECT_WAIT
};
void printStateFlags(jint flags) {
if (flags & JVMTI_THREAD_STATE_SUSPENDED) {
LOG(" JVMTI_THREAD_STATE_SUSPENDED");
}
if (flags & JVMTI_THREAD_STATE_INTERRUPTED) {
LOG(" JVMTI_THREAD_STATE_INTERRUPTED");
}
if (flags & JVMTI_THREAD_STATE_IN_NATIVE) {
LOG(" JVMTI_THREAD_STATE_IN_NATIVE");
}
LOG(" (0x%0x)\n", flags);
}
void JNICALL
VMInit(jvmtiEnv *jvmti_env, JNIEnv *jni, jthread thr) {
jvmtiError err = jvmti_env->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_THREAD_START, NULL);
check_jvmti_status(jni, err, "Failed to enable THREAD_START event");
}
void JNICALL
ThreadStart(jvmtiEnv *jvmti_env, JNIEnv *jni, jthread thread) {
RawMonitorLocker rml = RawMonitorLocker(jvmti, jni, access_lock);
jvmtiThreadInfo thread_info = get_thread_info(jvmti_env, jni, thread);
if (thread_info.name != NULL && strcmp(thread_info.name, "tested_thread_thr1") == 0) {
thr_ptr = jni->NewGlobalRef(thread);
LOG(">>> ThreadStart: \"%s\", 0x%p\n", thread_info.name, thr_ptr);
}
}
jint Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) {
jvmtiCapabilities caps;
jvmtiEventCallbacks callbacks;
jint res;
jvmtiError err;
res = jvm->GetEnv((void **) &jvmti, JVMTI_VERSION_1_1);
if (res != JNI_OK || jvmti == NULL) {
LOG("Wrong result of a valid call to GetEnv!\n");
return JNI_ERR;
}
memset(&caps, 0, sizeof(caps));
caps.can_support_virtual_threads = true;
caps.can_suspend = true;
err = jvmti->AddCapabilities(&caps);
if (err != JVMTI_ERROR_NONE) {
LOG("(AddCapabilities) unexpected error: %s (%d)\n", TranslateError(err), err);
return JNI_ERR;
}
access_lock = create_raw_monitor(jvmti, "_access_lock");
wait_lock = create_raw_monitor(jvmti, "_wait_lock");
callbacks.VMInit = &VMInit;
callbacks.ThreadStart = &ThreadStart;
err = jvmti->SetEventCallbacks(&callbacks, sizeof(callbacks));
if (err != JVMTI_ERROR_NONE) {
LOG("(SetEventCallbacks) unexpected error: %s (%d)\n", TranslateError(err), err);
return JNI_ERR;
}
err = jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_VM_INIT, NULL);
if (err != JVMTI_ERROR_NONE) {
LOG("Failed to enable VM_INIT event: %s (%d)\n", TranslateError(err), err);
return JNI_ERR;
}
return JNI_OK;
}
JNIEXPORT void JNICALL
Java_thrstat02_init(JNIEnv *jni, jclass cls, jint waitTime) {
wait_time = waitTime * 60000;
}
void wait_for(JNIEnv *jni, jint millis) {
RawMonitorLocker rml = RawMonitorLocker(jvmti, jni, wait_lock);
rml.wait(millis);
}
JNIEXPORT jboolean JNICALL
Java_thrstat02_checkStatus0(JNIEnv *jni, jclass cls, jint statInd, jboolean suspended) {
jboolean result = JNI_TRUE;
jint thrState;
jint suspState = -1;
jint right_stat = (suspended ? JVMTI_THREAD_STATE_SUSPENDED : 0);
jvmtiError right_ans = (suspended ? JVMTI_ERROR_THREAD_SUSPENDED : JVMTI_ERROR_NONE);
const char *suspStr = (suspended ? ", suspended" : "");
jvmtiError err;
jint millis;
jboolean timeout_is_reached;
unsigned int waited_millis;
if (jvmti == NULL) {
LOG("JVMTI client was not properly loaded!\n");
return JNI_FALSE;
}
if (thr_ptr == NULL) {
LOG("Missing thread \"tested_thread_thr1\" start event\n");
return JNI_FALSE;
}
LOG("START checkStatus for \"tested_thread_thr1\" (0x%p%s), check state: %s\n",
thr_ptr, suspStr, TranslateState(state[statInd]));
timeout_is_reached = JNI_TRUE;
for (millis = WAIT_START, waited_millis = 0; millis < wait_time; millis <<= 1) {
err = jvmti->GetThreadState(thr_ptr, &thrState);
if (err != JVMTI_ERROR_NONE) {
LOG("(GetThreadState#%d) unexpected error: %s (%d)\n", statInd, TranslateError(err), err);
result = JNI_FALSE;
timeout_is_reached = JNI_FALSE;
break;
}
suspState = thrState & JVMTI_THREAD_STATE_SUSPENDED;
if (suspended || (thrState & JVMTI_THREAD_STATE_RUNNABLE) == 0 || (state[statInd] == JVMTI_THREAD_STATE_RUNNABLE)) {
timeout_is_reached = JNI_FALSE;
break;
}
waited_millis += millis;
wait_for(jni, millis);
}
LOG(">>> thread \"tested_thread_thr1\" (0x%p) state: %s (%d)\n",
thr_ptr, TranslateState(thrState), thrState);
LOG(">>>\tflags:");
printStateFlags(suspState);
if (timeout_is_reached == JNI_TRUE) {
LOG("Error: timeout (%d secs) has been reached\n", waited_millis / 1000);
}
if ((thrState & state[statInd]) == 0) {
LOG("#1: Wrong thread \"tested_thread_thr1\" (0x%p%s) state:\n", thr_ptr, suspStr);
LOG(" expected: %s (%d)\n", TranslateState(state[statInd]), state[statInd]);
LOG(" actual: %s (%d)\n", TranslateState(thrState), thrState);
result = JNI_FALSE;
}
if (suspState != right_stat) {
LOG("#2: Wrong thread \"tested_thread_thr1\" (0x%p%s) state flags:\n", thr_ptr, suspStr);
LOG(" expected:");
printStateFlags(right_stat);
LOG(" actual:");
printStateFlags(suspState);
result = JNI_FALSE;
}
err = jvmti->SuspendThread(thr_ptr);
if (err != right_ans) {
LOG("#3: Wrong result of SuspendThread() for \"tested_thread_thr1\" (0x%p%s):\n", thr_ptr, suspStr);
LOG(" expected: %s (%d), actual: %s (%d)\n", TranslateError(right_ans), right_ans, TranslateError(err), err);
result = JNI_FALSE;
}
if (!suspended) {
// wait till thread is not suspended
timeout_is_reached = JNI_TRUE;
for (millis = WAIT_START, waited_millis = 0; millis < wait_time; millis <<= 1) {
waited_millis += millis;
wait_for(jni, millis);
err = jvmti->GetThreadState(thr_ptr, &thrState);
if (err != JVMTI_ERROR_NONE) {
LOG("(GetThreadState#%d,after) unexpected error: %s (%d)\n", statInd, TranslateError(err), err);
timeout_is_reached = JNI_FALSE;
result = JNI_FALSE;
break;
}
suspState = thrState & JVMTI_THREAD_STATE_SUSPENDED;
if (suspState) {
timeout_is_reached = JNI_FALSE;
break;
}
}
if (timeout_is_reached == JNI_TRUE) {
LOG("Error: timeout (%d secs) has been reached\n", waited_millis / 1000);
}
if ((thrState & state[statInd]) == 0) {
LOG("#4: Wrong thread \"tested_thread_thr1\" (0x%p) state after SuspendThread:\n", thr_ptr);
LOG(" expected: %s (%d)\n", TranslateState(state[statInd]), state[statInd]);
LOG(" actual: %s (%d)\n", TranslateState(thrState), thrState);
result = JNI_FALSE;
}
if (suspState != JVMTI_THREAD_STATE_SUSPENDED) {
LOG("#5: Wrong thread \"tested_thread_thr1\" (0x%p) state flags", thr_ptr);
LOG(" after SuspendThread:\n");
LOG(" expected:");
printStateFlags(JVMTI_THREAD_STATE_SUSPENDED);
LOG(" actual:");
printStateFlags(suspState);
result = JNI_FALSE;
}
resume_thread(jvmti, jni, thr_ptr);
}
return result;
}
}