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/*
* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "rtc_base/thread_annotations.h"
#include "test/gtest.h"
namespace {
class RTC_LOCKABLE Lock {
public:
void EnterWrite() const RTC_EXCLUSIVE_LOCK_FUNCTION() {}
void EnterRead() const RTC_SHARED_LOCK_FUNCTION() {}
bool TryEnterWrite() const RTC_EXCLUSIVE_TRYLOCK_FUNCTION(true) {
return true;
}
bool TryEnterRead() const RTC_SHARED_TRYLOCK_FUNCTION(true) { return true; }
void Leave() const RTC_UNLOCK_FUNCTION() {}
};
class RTC_SCOPED_LOCKABLE ScopeLock {
public:
explicit ScopeLock(const Lock& lock) RTC_EXCLUSIVE_LOCK_FUNCTION(lock) {}
~ScopeLock() RTC_UNLOCK_FUNCTION() {}
};
class ThreadSafe {
public:
ThreadSafe() { pt_protected_by_lock_ = new int; }
~ThreadSafe() { delete pt_protected_by_lock_; }
void LockInOrder() {
beforelock_.EnterWrite();
lock_.EnterWrite();
pt_lock_.EnterWrite();
pt_lock_.Leave();
lock_.Leave();
beforelock_.Leave();
}
void UnprotectedFunction() RTC_LOCKS_EXCLUDED(lock_, pt_lock_) {
// Can access unprotected Value.
unprotected_ = 15;
// Can access pointers themself, but not data they point to.
int* tmp = pt_protected_by_lock_;
pt_protected_by_lock_ = tmp;
}
void ReadProtected() {
lock_.EnterRead();
unprotected_ = protected_by_lock_;
lock_.Leave();
if (pt_lock_.TryEnterRead()) {
unprotected_ = *pt_protected_by_lock_;
pt_lock_.Leave();
}
}
void WriteProtected() {
lock_.EnterWrite();
protected_by_lock_ = unprotected_;
lock_.Leave();
if (pt_lock_.TryEnterWrite()) {
*pt_protected_by_lock_ = unprotected_;
pt_lock_.Leave();
}
}
void CallReadProtectedFunction() {
lock_.EnterRead();
pt_lock_.EnterRead();
ReadProtectedFunction();
pt_lock_.Leave();
lock_.Leave();
}
void CallWriteProtectedFunction() {
ScopeLock scope_lock(GetLock());
ScopeLock pt_scope_lock(pt_lock_);
WriteProtectedFunction();
}
private:
void ReadProtectedFunction() RTC_SHARED_LOCKS_REQUIRED(lock_, pt_lock_) {
unprotected_ = protected_by_lock_;
unprotected_ = *pt_protected_by_lock_;
}
void WriteProtectedFunction() RTC_EXCLUSIVE_LOCKS_REQUIRED(lock_, pt_lock_) {
int x = protected_by_lock_;
*pt_protected_by_lock_ = x;
protected_by_lock_ = unprotected_;
}
const Lock& GetLock() RTC_LOCK_RETURNED(lock_) { return lock_; }
Lock beforelock_ RTC_ACQUIRED_BEFORE(lock_);
Lock lock_;
Lock pt_lock_ RTC_ACQUIRED_AFTER(lock_);
int unprotected_ = 0;
int protected_by_lock_ RTC_GUARDED_BY(lock_) = 0;
int* pt_protected_by_lock_ RTC_PT_GUARDED_BY(pt_lock_);
};
} // namespace
TEST(ThreadAnnotationsTest, Test) {
// This test ensure thread annotations doesn't break compilation.
// Thus no run-time expectations.
ThreadSafe t;
t.LockInOrder();
t.UnprotectedFunction();
t.ReadProtected();
t.WriteProtected();
t.CallReadProtectedFunction();
t.CallWriteProtectedFunction();
}
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