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test/hotspot/jtreg/vmTestbase/nsk/jdi/ThreadReference/forceEarlyReturn/forceEarlyReturn004/libforceEarlyReturn004a.cpp

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*** 1,7 **** /* ! * Copyright (c) 2007, 2018, 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. --- 1,7 ---- /* ! * Copyright (c) 2007, 2020, 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.
*** 29,52 **** int always_true = 1; JNIEXPORT jint JNICALL Java_nsk_jdi_ThreadReference_forceEarlyReturn_forceEarlyReturn004_forceEarlyReturn004a_nativeMethod(JNIEnv *env, jobject classObject, jobject object) { - int dummy_counter = 0; // notify another thread that thread in native method jclass klass = env->GetObjectClass(object); jfieldID field = env->GetFieldID(klass, "threadInNative", "Z"); env->SetBooleanField(object, field, 1); ! // execute infinite loop to be sure that thread in native method ! while (always_true) ! { ! // Need some dummy code so the optimizer does not remove this loop. ! dummy_counter = dummy_counter < 1000 ? 0 : dummy_counter + 1; ! } ! // The optimizer can be surprisingly clever. ! // Use dummy_counter so it can never be optimized out. ! // This statement will always return 0. ! return dummy_counter >= 0 ? 0 : 1; } } --- 29,46 ---- int always_true = 1; JNIEXPORT jint JNICALL Java_nsk_jdi_ThreadReference_forceEarlyReturn_forceEarlyReturn004_forceEarlyReturn004a_nativeMethod(JNIEnv *env, jobject classObject, jobject object) { // notify another thread that thread in native method jclass klass = env->GetObjectClass(object); jfieldID field = env->GetFieldID(klass, "threadInNative", "Z"); env->SetBooleanField(object, field, 1); ! // attempt to read char from stdin instead of infinite loop ! // because infinite loop might be eliminated by compiler optimizer. ! fgetc(stdin); ! ! return -1; } }
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