Java example source code file (jmm.h)
The jmm.h Java example source code
/*
* Copyright (c) 2003, 2013, 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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 _JAVA_JMM_H_
#define _JAVA_JMM_H_
/*
* This is a private interface used by JDK for JVM monitoring
* and management.
*
* Bump the version number when either of the following happens:
*
* 1. There is a change in functions in JmmInterface.
*
* 2. There is a change in the contract between VM and Java classes.
*/
#include "jni.h"
#ifdef __cplusplus
extern "C" {
#endif
enum {
JMM_VERSION_1 = 0x20010000,
JMM_VERSION_1_0 = 0x20010000,
JMM_VERSION_1_1 = 0x20010100, // JDK 6
JMM_VERSION_1_2 = 0x20010200, // JDK 7
JMM_VERSION_1_2_1 = 0x20010201, // JDK 7 GA
JMM_VERSION_1_2_2 = 0x20010202,
JMM_VERSION = 0x20010203
};
typedef struct {
unsigned int isLowMemoryDetectionSupported : 1;
unsigned int isCompilationTimeMonitoringSupported : 1;
unsigned int isThreadContentionMonitoringSupported : 1;
unsigned int isCurrentThreadCpuTimeSupported : 1;
unsigned int isOtherThreadCpuTimeSupported : 1;
unsigned int isBootClassPathSupported : 1;
unsigned int isObjectMonitorUsageSupported : 1;
unsigned int isSynchronizerUsageSupported : 1;
unsigned int isThreadAllocatedMemorySupported : 1;
unsigned int isRemoteDiagnosticCommandsSupported : 1;
unsigned int : 22;
} jmmOptionalSupport;
typedef enum {
JMM_CLASS_LOADED_COUNT = 1, /* Total number of loaded classes */
JMM_CLASS_UNLOADED_COUNT = 2, /* Total number of unloaded classes */
JMM_THREAD_TOTAL_COUNT = 3, /* Total number of threads that have been started */
JMM_THREAD_LIVE_COUNT = 4, /* Current number of live threads */
JMM_THREAD_PEAK_COUNT = 5, /* Peak number of live threads */
JMM_THREAD_DAEMON_COUNT = 6, /* Current number of daemon threads */
JMM_JVM_INIT_DONE_TIME_MS = 7, /* Time when the JVM finished initialization */
JMM_COMPILE_TOTAL_TIME_MS = 8, /* Total accumulated time spent in compilation */
JMM_GC_TIME_MS = 9, /* Total accumulated time spent in collection */
JMM_GC_COUNT = 10, /* Total number of collections */
JMM_JVM_UPTIME_MS = 11, /* The JVM uptime in milliseconds */
JMM_INTERNAL_ATTRIBUTE_INDEX = 100,
JMM_CLASS_LOADED_BYTES = 101, /* Number of bytes loaded instance classes */
JMM_CLASS_UNLOADED_BYTES = 102, /* Number of bytes unloaded instance classes */
JMM_TOTAL_CLASSLOAD_TIME_MS = 103, /* Accumulated VM class loader time (TraceClassLoadingTime) */
JMM_VM_GLOBAL_COUNT = 104, /* Number of VM internal flags */
JMM_SAFEPOINT_COUNT = 105, /* Total number of safepoints */
JMM_TOTAL_SAFEPOINTSYNC_TIME_MS = 106, /* Accumulated time spent getting to safepoints */
JMM_TOTAL_STOPPED_TIME_MS = 107, /* Accumulated time spent at safepoints */
JMM_TOTAL_APP_TIME_MS = 108, /* Accumulated time spent in Java application */
JMM_VM_THREAD_COUNT = 109, /* Current number of VM internal threads */
JMM_CLASS_INIT_TOTAL_COUNT = 110, /* Number of classes for which initializers were run */
JMM_CLASS_INIT_TOTAL_TIME_MS = 111, /* Accumulated time spent in class initializers */
JMM_METHOD_DATA_SIZE_BYTES = 112, /* Size of method data in memory */
JMM_CLASS_VERIFY_TOTAL_TIME_MS = 113, /* Accumulated time spent in class verifier */
JMM_SHARED_CLASS_LOADED_COUNT = 114, /* Number of shared classes loaded */
JMM_SHARED_CLASS_UNLOADED_COUNT = 115, /* Number of shared classes unloaded */
JMM_SHARED_CLASS_LOADED_BYTES = 116, /* Number of bytes loaded shared classes */
JMM_SHARED_CLASS_UNLOADED_BYTES = 117, /* Number of bytes unloaded shared classes */
JMM_OS_ATTRIBUTE_INDEX = 200,
JMM_OS_PROCESS_ID = 201, /* Process id of the JVM */
JMM_OS_MEM_TOTAL_PHYSICAL_BYTES = 202, /* Physical memory size */
JMM_GC_EXT_ATTRIBUTE_INFO_SIZE = 401 /* the size of the GC specific attributes for a given GC memory manager */
} jmmLongAttribute;
typedef enum {
JMM_VERBOSE_GC = 21,
JMM_VERBOSE_CLASS = 22,
JMM_THREAD_CONTENTION_MONITORING = 23,
JMM_THREAD_CPU_TIME = 24,
JMM_THREAD_ALLOCATED_MEMORY = 25
} jmmBoolAttribute;
enum {
JMM_THREAD_STATE_FLAG_SUSPENDED = 0x00100000,
JMM_THREAD_STATE_FLAG_NATIVE = 0x00400000
};
#define JMM_THREAD_STATE_FLAG_MASK 0xFFF00000
typedef enum {
JMM_STAT_PEAK_THREAD_COUNT = 801,
JMM_STAT_THREAD_CONTENTION_COUNT = 802,
JMM_STAT_THREAD_CONTENTION_TIME = 803,
JMM_STAT_THREAD_CONTENTION_STAT = 804,
JMM_STAT_PEAK_POOL_USAGE = 805,
JMM_STAT_GC_STAT = 806
} jmmStatisticType;
typedef enum {
JMM_USAGE_THRESHOLD_HIGH = 901,
JMM_USAGE_THRESHOLD_LOW = 902,
JMM_COLLECTION_USAGE_THRESHOLD_HIGH = 903,
JMM_COLLECTION_USAGE_THRESHOLD_LOW = 904
} jmmThresholdType;
/* Should match what is allowed in globals.hpp */
typedef enum {
JMM_VMGLOBAL_TYPE_UNKNOWN = 0,
JMM_VMGLOBAL_TYPE_JBOOLEAN = 1,
JMM_VMGLOBAL_TYPE_JSTRING = 2,
JMM_VMGLOBAL_TYPE_JLONG = 3
} jmmVMGlobalType;
typedef enum {
JMM_VMGLOBAL_ORIGIN_DEFAULT = 1, /* Default value */
JMM_VMGLOBAL_ORIGIN_COMMAND_LINE = 2, /* Set at command line (or JNI invocation) */
JMM_VMGLOBAL_ORIGIN_MANAGEMENT = 3, /* Set via management interface */
JMM_VMGLOBAL_ORIGIN_ENVIRON_VAR = 4, /* Set via environment variables */
JMM_VMGLOBAL_ORIGIN_CONFIG_FILE = 5, /* Set via config file (such as .hotspotrc) */
JMM_VMGLOBAL_ORIGIN_ERGONOMIC = 6, /* Set via ergonomic */
JMM_VMGLOBAL_ORIGIN_OTHER = 99 /* Set via some other mechanism */
} jmmVMGlobalOrigin;
typedef struct {
jstring name;
jvalue value;
jmmVMGlobalType type; /* Data type */
jmmVMGlobalOrigin origin; /* Default or non-default value */
unsigned int writeable : 1; /* dynamically writeable */
unsigned int external : 1; /* external supported interface */
unsigned int reserved : 30;
void *reserved1;
void *reserved2;
} jmmVMGlobal;
typedef struct {
const char* name;
char type;
const char* description;
} jmmExtAttributeInfo;
/* Caller has to set the following fields before calling GetLastGCStat
* o usage_before_gc - array of MemoryUsage objects
* o usage_after_gc - array of MemoryUsage objects
* o gc_ext_attribute_values_size - size of gc_ext_atttribute_values array
* o gc_ext_attribtue_values - array of jvalues
*/
typedef struct {
jlong gc_index; /* Index of the collections */
jlong start_time; /* Start time of the GC */
jlong end_time; /* End time of the GC */
jobjectArray usage_before_gc; /* Memory usage array before GC */
jobjectArray usage_after_gc; /* Memory usage array after GC */
jint gc_ext_attribute_values_size; /* set by the caller of GetGCStat */
jvalue* gc_ext_attribute_values; /* Array of jvalue for GC extension attributes */
jint num_gc_ext_attributes; /* number of GC extension attribute values s are filled */
/* -1 indicates gc_ext_attribute_values is not big enough */
} jmmGCStat;
typedef struct {
const char* name; /* Name of the diagnostic command */
const char* description; /* Short description */
const char* impact; /* Impact on the JVM */
const char* permission_class; /* Class name of the required permission if any */
const char* permission_name; /* Permission name of the required permission if any */
const char* permission_action; /* Action name of the required permission if any*/
int num_arguments; /* Number of supported options or arguments */
jboolean enabled; /* True if the diagnostic command can be invoked, false otherwise*/
} dcmdInfo;
typedef struct {
const char* name; /* Option/Argument name*/
const char* description; /* Short description */
const char* type; /* Type: STRING, BOOLEAN, etc. */
const char* default_string; /* Default value in a parsable string */
jboolean mandatory; /* True if the option/argument is mandatory */
jboolean option; /* True if it is an option, false if it is an argument */
/* (see diagnosticFramework.hpp for option/argument definitions) */
jboolean multiple; /* True is the option can be specified several time */
int position; /* Expected position for this argument (this field is */
/* meaningless for options) */
} dcmdArgInfo;
typedef struct jmmInterface_1_ {
void* reserved1;
void* reserved2;
jint (JNICALL *GetVersion) (JNIEnv *env);
jint (JNICALL *GetOptionalSupport) (JNIEnv *env,
jmmOptionalSupport* support_ptr);
/* This is used by JDK 6 and earlier.
* For JDK 7 and after, use GetInputArgumentArray.
*/
jobject (JNICALL *GetInputArguments) (JNIEnv *env);
jint (JNICALL *GetThreadInfo) (JNIEnv *env,
jlongArray ids,
jint maxDepth,
jobjectArray infoArray);
jobjectArray (JNICALL *GetInputArgumentArray) (JNIEnv *env);
jobjectArray (JNICALL *GetMemoryPools) (JNIEnv* env, jobject mgr);
jobjectArray (JNICALL *GetMemoryManagers) (JNIEnv* env, jobject pool);
jobject (JNICALL *GetMemoryPoolUsage) (JNIEnv* env, jobject pool);
jobject (JNICALL *GetPeakMemoryPoolUsage) (JNIEnv* env, jobject pool);
void (JNICALL *GetThreadAllocatedMemory)
(JNIEnv *env,
jlongArray ids,
jlongArray sizeArray);
jobject (JNICALL *GetMemoryUsage) (JNIEnv* env, jboolean heap);
jlong (JNICALL *GetLongAttribute) (JNIEnv *env, jobject obj, jmmLongAttribute att);
jboolean (JNICALL *GetBoolAttribute) (JNIEnv *env, jmmBoolAttribute att);
jboolean (JNICALL *SetBoolAttribute) (JNIEnv *env, jmmBoolAttribute att, jboolean flag);
jint (JNICALL *GetLongAttributes) (JNIEnv *env,
jobject obj,
jmmLongAttribute* atts,
jint count,
jlong* result);
jobjectArray (JNICALL *FindCircularBlockedThreads) (JNIEnv *env);
// Not used in JDK 6 or JDK 7
jlong (JNICALL *GetThreadCpuTime) (JNIEnv *env, jlong thread_id);
jobjectArray (JNICALL *GetVMGlobalNames) (JNIEnv *env);
jint (JNICALL *GetVMGlobals) (JNIEnv *env,
jobjectArray names,
jmmVMGlobal *globals,
jint count);
jint (JNICALL *GetInternalThreadTimes) (JNIEnv *env,
jobjectArray names,
jlongArray times);
jboolean (JNICALL *ResetStatistic) (JNIEnv *env,
jvalue obj,
jmmStatisticType type);
void (JNICALL *SetPoolSensor) (JNIEnv *env,
jobject pool,
jmmThresholdType type,
jobject sensor);
jlong (JNICALL *SetPoolThreshold) (JNIEnv *env,
jobject pool,
jmmThresholdType type,
jlong threshold);
jobject (JNICALL *GetPoolCollectionUsage) (JNIEnv* env, jobject pool);
jint (JNICALL *GetGCExtAttributeInfo) (JNIEnv *env,
jobject mgr,
jmmExtAttributeInfo *ext_info,
jint count);
void (JNICALL *GetLastGCStat) (JNIEnv *env,
jobject mgr,
jmmGCStat *gc_stat);
jlong (JNICALL *GetThreadCpuTimeWithKind)
(JNIEnv *env,
jlong thread_id,
jboolean user_sys_cpu_time);
void (JNICALL *GetThreadCpuTimesWithKind)
(JNIEnv *env,
jlongArray ids,
jlongArray timeArray,
jboolean user_sys_cpu_time);
jint (JNICALL *DumpHeap0) (JNIEnv *env,
jstring outputfile,
jboolean live);
jobjectArray (JNICALL *FindDeadlocks) (JNIEnv *env,
jboolean object_monitors_only);
void (JNICALL *SetVMGlobal) (JNIEnv *env,
jstring flag_name,
jvalue new_value);
void* reserved6;
jobjectArray (JNICALL *DumpThreads) (JNIEnv *env,
jlongArray ids,
jboolean lockedMonitors,
jboolean lockedSynchronizers);
void (JNICALL *SetGCNotificationEnabled) (JNIEnv *env,
jobject mgr,
jboolean enabled);
jobjectArray (JNICALL *GetDiagnosticCommands) (JNIEnv *env);
void (JNICALL *GetDiagnosticCommandInfo)
(JNIEnv *env,
jobjectArray cmds,
dcmdInfo *infoArray);
void (JNICALL *GetDiagnosticCommandArgumentsInfo)
(JNIEnv *env,
jstring commandName,
dcmdArgInfo *infoArray);
jstring (JNICALL *ExecuteDiagnosticCommand)
(JNIEnv *env,
jstring command);
void (JNICALL *SetDiagnosticFrameworkNotificationEnabled)
(JNIEnv *env,
jboolean enabled);
} JmmInterface;
#ifdef __cplusplus
} /* extern "C" */
#endif /* __cplusplus */
#endif /* !_JAVA_JMM_H_ */
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