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/*
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
// Examples where the code checks what thread it's currently running on.
class ThreadSensitivity {
Object monitorA, monitorB;
void conditionalAssertMainThread_Bad(boolean b) {
if (b) {
// this branch asserts on Main thread
OurThreadUtils.assertMainThread();
synchronized (monitorA) {
synchronized (monitorB) {
}
}
} else {
// this branch asserts nothing, so may run in parallel with the other branch
synchronized (monitorB) {
synchronized (monitorA) {
}
}
}
}
Object monitorC, monitorD;
// the branches in the following two methods are both on main/UI thread so cannot deadlock
void FP_conditionalIsMainThread_Ok() {
if (OurThreadUtils.isMainThread()) {
synchronized (monitorC) {
synchronized (monitorD) {
}
}
}
}
void FP_conditionalIsUiThread_Ok() {
if (OurThreadUtils.isUiThread()) {
synchronized (monitorD) {
synchronized (monitorC) {
}
}
}
}
Object monitorE, monitorF;
// identical to the first case above but negated
void conditionalNegatedIsMainThread_Bad() {
if (!OurThreadUtils.isMainThread()) {
synchronized (monitorE) {
synchronized (monitorF) {
}
}
} else {
synchronized (monitorF) {
synchronized (monitorE) {
}
}
}
}
Object monitorG, monitorH;
public void confusedAssertBad(boolean b, boolean c) {
if (b) {
OurThreadUtils.assertOnBackgroundThread();
} else {
OurThreadUtils.assertOnUiThread();
}
// not sure if we're on UI or background, should report
if (c) {
synchronized (monitorG) {
synchronized (monitorH) {
}
}
} else {
synchronized (monitorH) {
synchronized (monitorG) {
}
}
}
}
Object monitorI, monitorJ;
public void FP_confusedAssertOk(boolean b) {
if (b) {
OurThreadUtils.assertOnBackgroundThread();
}
// b determines if running on UI thread, should NOT report
if (b) {
synchronized (monitorI) {
synchronized (monitorJ) {
}
}
}
if (b) {
synchronized (monitorJ) {
synchronized (monitorI) {
}
}
}
}
}