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/*
* Copyright (c) 2018, 2025, 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 "classfile/vmClasses.hpp"
#include "memory/allocation.hpp"
#include "memory/universe.hpp"
#include "runtime/interfaceSupport.inline.hpp"
#include "runtime/objectMonitor.hpp"
#include "runtime/synchronizer.hpp"
#include "runtime/vm_version.hpp"
#include "threadHelper.inline.hpp"
#include "unittest.hpp"
class SynchronizerTest : public ::testing::Test {
public:
static u_char* get_gvars_addr() { return ObjectSynchronizer::get_gvars_addr(); }
static u_char* get_gvars_hc_sequence_addr() { return ObjectSynchronizer::get_gvars_hc_sequence_addr(); }
static size_t get_gvars_size() { return ObjectSynchronizer::get_gvars_size(); }
static u_char* get_gvars_stw_random_addr() { return ObjectSynchronizer::get_gvars_stw_random_addr(); }
};
TEST_VM(SynchronizerTest, sanity) {
uint cache_line_size = VM_Version::L1_data_cache_line_size();
if (cache_line_size != 0) {
// We were able to determine the L1 data cache line size so
// do some cache line specific sanity checks
u_char *addr_begin = SynchronizerTest::get_gvars_addr();
u_char *addr_stw_random = SynchronizerTest::get_gvars_stw_random_addr();
u_char *addr_hc_sequence = SynchronizerTest::get_gvars_hc_sequence_addr();
size_t gvars_size = SynchronizerTest::get_gvars_size();
uint offset_stw_random = (uint) (addr_stw_random - addr_begin);
uint offset_hc_sequence = (uint) (addr_hc_sequence - addr_begin);
uint offset_hc_sequence_stw_random = offset_hc_sequence - offset_stw_random;
uint offset_hc_sequence_struct_end = (uint) gvars_size - offset_hc_sequence;
EXPECT_GE(offset_stw_random, cache_line_size)
<< "the SharedGlobals.stw_random field is closer "
<< "to the struct beginning than a cache line which permits "
<< "false sharing.";
EXPECT_GE(offset_hc_sequence_stw_random, cache_line_size)
<< "the SharedGlobals.stw_random and "
<< "SharedGlobals.hc_sequence fields are closer than a cache "
<< "line which permits false sharing.";
EXPECT_GE(offset_hc_sequence_struct_end, cache_line_size)
<< "the SharedGlobals.hc_sequence field is closer "
<< "to the struct end than a cache line which permits false "
<< "sharing.";
}
}
TEST_VM(SynchronizerTest, monitorListStats) {
JavaThread* THREAD = JavaThread::current();
ThreadInVMfromNative invm(THREAD);
ResourceMark rm(THREAD);
// Something to reference in OM. It makes no difference which oop it is,
// as long as it is correct.
oop obj = vmClasses::Byte_klass()->allocate_instance(THREAD);
HandleMark hm(THREAD);
Handle h_obj(THREAD, obj);
// Test various combinations of thread counts, including single-threaded test.
static const int MIN_THREADS = 1;
static const int MAX_THREADS = 16;
static const int OM_PER_THREAD = 1000;
for (int threads = MIN_THREADS; threads <= MAX_THREADS; threads *= 2) {
MonitorList list;
auto work = [&](Thread*, int) {
for (int c = 0; c < OM_PER_THREAD; c++) {
list.add(new ObjectMonitor(h_obj()));
}
};
TestThreadGroup<decltype(work)> workers{work, threads};
workers.doit();
workers.join();
EXPECT_EQ(list.count(), (size_t)(threads*OM_PER_THREAD));
EXPECT_EQ(list.max(), (size_t)(threads*OM_PER_THREAD));
}
}
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