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113 lines
2.0 KiB
113 lines
2.0 KiB
/*
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* Copyright (c) 2016 - present Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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package codetoanalyze.java.checkers;
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import java.util.concurrent.locks.ReentrantLock;
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import javax.annotation.concurrent.ThreadSafe;
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class C {
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private int x = 0;
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public int get() {
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return x;
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}
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public void set(int v) {
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x = v;
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}
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}
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@ThreadSafe
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class ReadWriteRaces {
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// read and write outside of sync races
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Integer safe_read;
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Integer racy;
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void m0_OK(){
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Integer local;
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local = safe_read;
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}
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void m0_OK2(){ //parallel reads are OK
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Integer local;
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local = safe_read;
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}
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void m1(){ // A read where there are other writes
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Integer local;
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local = racy;
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}
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public void m2(){
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racy = 88;
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}
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public void m3(){
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racy = 99;
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}
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// write inside sync, read outside of sync races
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Object field1;
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Object field2;
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Object field3;
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// need to report races involving safe writes in order to get this one
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public synchronized void syncWrite1() {
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field1 = new Object();
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}
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public Object unprotectedRead1() {
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return field1;
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}
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private Object unprotectedReadInCallee() {
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return field1;
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}
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public Object callUnprotecteReadInCallee() {
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return unprotectedReadInCallee();
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}
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public void syncWrite2() {
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synchronized(this) {
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field2 = new Object();
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}
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}
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public Object unprotectedRead2() {
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return field2;
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}
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private synchronized void syncWrite3() {
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field3 = new Object();
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}
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public void callSyncWrite3() {
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syncWrite3();
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}
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public Object unprotectedRead3() {
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return field3;
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}
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private final C c = new C();
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private final ReentrantLock lock = new ReentrantLock();
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public void readInCalleeOutsideSyncBad(int i) {
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if (c.get() > i) { // should report read/write race here
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lock.lock();
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c.set(i);
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lock.unlock();
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}
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}
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}
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