/*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
*
* - Neither the name of Oracle nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This source code is provided to illustrate the usage of a given feature
* or technique and has been deliberately simplified. Additional steps
* required for a production-quality application, such as security checks,
* input validation and proper error handling, might not be present in
* this sample code.
*/
/* Example of using JVMTI_EVENT_GARBAGE_COLLECTION_START and
* JVMTI_EVENT_GARBAGE_COLLECTION_FINISH events.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "jni.h"
#include "jvmti.h"
/* For stdout_message(), fatal_error(), and check_jvmti_error() */
#include "agent_util.h"
/* Global static data */
static int gc_count;
/* Worker thread that waits for garbage collections */
static void JNICALL
{
stdout_message("GC worker started...\n");
for (;;) {
while (gc_count == 0) {
if (err != JVMTI_ERROR_NONE) {
return;
}
}
gc_count = 0;
stdout_message("post-GarbageCollectionFinish actions...\n");
}
}
/* Creates a new jthread */
static jthread
{
fatal_error("Cannot find Thread class\n");
}
fatal_error("Cannot find Thread constructor method\n");
}
fatal_error("Cannot create new Thread object\n");
}
return res;
}
/* Callback for JVMTI_EVENT_VM_INIT */
static void JNICALL
{
stdout_message("VMInit...\n");
}
/* Callback for JVMTI_EVENT_GARBAGE_COLLECTION_START */
static void JNICALL
{
stdout_message("GarbageCollectionStart...\n");
}
/* Callback for JVMTI_EVENT_GARBAGE_COLLECTION_FINISH */
static void JNICALL
{
stdout_message("GarbageCollectionFinish...\n");
gc_count++;
}
/* Agent_OnLoad() is called first, we prepare for a VM_INIT event here. */
{
/* Get JVMTI environment */
return -1;
}
/* Set callbacks and enable event notifications */
/* Create the necessary raw monitor */
return 0;
}
/* Agent_OnUnload() is called last */
{
}