test_safepoint_locks.cpp

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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#include "precompiled.hpp"
#include "runtime/interfaceSupport.inline.hpp"
#include "runtime/mutex.hpp"
#include "runtime/mutexLocker.hpp"
#include "unittest.hpp"

#ifdef ASSERT

// Test mismatched safepoint check flag on lock declaration vs. lock acquisition.
TEST_VM_ASSERT_MSG(SafepointLockAssertTest, always_check,
    ".*This lock should always have a safepoint check for Java threads: SFPT_Test_lock") {
  MutexLocker ml(new Mutex(Mutex::leaf, "SFPT_Test_lock", true, Mutex::_safepoint_check_always),
                 Mutex::_no_safepoint_check_flag);
}

TEST_VM_ASSERT_MSG(SafepointLockAssertTest, never_check,
    ".*This lock should never have a safepoint check for Java threads: SFPT_Test_lock") {
  MutexLocker ml(new Mutex(Mutex::leaf, "SFPT_Test_lock", true, Mutex::_safepoint_check_never),
                 Mutex::_safepoint_check_flag);
}

TEST_VM_ASSERT_MSG(SafepointLockAssertTest, special_locks,
    ".*Special locks or below should never safepoint") {
  MutexLocker ml(new Mutex(Mutex::special, "SpecialTest_lock", /*vm_block*/true, Mutex::_safepoint_check_always),
                 Mutex::_safepoint_check_flag);
}

TEST_VM_ASSERT_MSG(SafepointLockAssertTest, possible_safepoint_lock,
    ".* Possible safepoint reached by thread that does not allow it") {
  JavaThread* thread = JavaThread::current();
  ThreadInVMfromNative in_native(thread);
  MutexLocker ml(new Mutex(Mutex::special, "SpecialTest_lock", /*vm_block*/true, Mutex::_safepoint_check_never),
                   Mutex::_no_safepoint_check_flag);
  thread->print_thread_state_on(tty);
  // If the lock above succeeds, try to safepoint to test the NSV implied with this special lock.
  ThreadBlockInVM tbivm(thread);
  thread->print_thread_state_on(tty);
}

#endif // ASSERT