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37651993ed
these are deprecated in clang and are noop for other compiles https://clang.llvm.org/docs/ThreadSafetyAnalysis.html#guarded-var-and-pt-guarded-var Bug: None Change-Id: Ie7d32b827933687e4c4a78d27574cbfb7d40d87e Reviewed-on: https://webrtc-review.googlesource.com/17782 Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20530}
134 lines
3.3 KiB
C++
134 lines
3.3 KiB
C++
/*
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* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "rtc_base/thread_annotations.h"
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#include "test/gtest.h"
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namespace {
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class RTC_LOCKABLE Lock {
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public:
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void EnterWrite() const RTC_EXCLUSIVE_LOCK_FUNCTION() {}
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void EnterRead() const RTC_SHARED_LOCK_FUNCTION() {}
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bool TryEnterWrite() const RTC_EXCLUSIVE_TRYLOCK_FUNCTION(true) {
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return true;
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}
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bool TryEnterRead() const RTC_SHARED_TRYLOCK_FUNCTION(true) { return true; }
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void Leave() const RTC_UNLOCK_FUNCTION() {}
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};
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class RTC_SCOPED_LOCKABLE ScopeLock {
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public:
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explicit ScopeLock(const Lock& lock) RTC_EXCLUSIVE_LOCK_FUNCTION(lock) {}
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~ScopeLock() RTC_UNLOCK_FUNCTION() {}
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};
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class ThreadSafe {
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public:
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ThreadSafe() {
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pt_protected_by_lock_ = new int;
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}
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~ThreadSafe() {
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delete pt_protected_by_lock_;
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}
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void LockInOrder() {
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beforelock_.EnterWrite();
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lock_.EnterWrite();
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pt_lock_.EnterWrite();
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pt_lock_.Leave();
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lock_.Leave();
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beforelock_.Leave();
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}
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void UnprotectedFunction() RTC_LOCKS_EXCLUDED(lock_, pt_lock_) {
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// Can access unprotected Value.
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unprotected_ = 15;
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// Can access pointers themself, but not data they point to.
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int* tmp = pt_protected_by_lock_;
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pt_protected_by_lock_ = tmp;
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}
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void ReadProtected() {
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lock_.EnterRead();
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unprotected_ = protected_by_lock_;
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lock_.Leave();
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if (pt_lock_.TryEnterRead()) {
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unprotected_ = *pt_protected_by_lock_;
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pt_lock_.Leave();
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}
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}
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void WriteProtected() {
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lock_.EnterWrite();
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protected_by_lock_ = unprotected_;
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lock_.Leave();
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if (pt_lock_.TryEnterWrite()) {
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*pt_protected_by_lock_ = unprotected_;
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pt_lock_.Leave();
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}
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}
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void CallReadProtectedFunction() {
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lock_.EnterRead();
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pt_lock_.EnterRead();
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ReadProtectedFunction();
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pt_lock_.Leave();
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lock_.Leave();
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}
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void CallWriteProtectedFunction() {
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ScopeLock scope_lock(GetLock());
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ScopeLock pt_scope_lock(pt_lock_);
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WriteProtectedFunction();
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}
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private:
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void ReadProtectedFunction() RTC_SHARED_LOCKS_REQUIRED(lock_, pt_lock_) {
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unprotected_ = protected_by_lock_;
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unprotected_ = *pt_protected_by_lock_;
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}
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void WriteProtectedFunction() RTC_EXCLUSIVE_LOCKS_REQUIRED(lock_, pt_lock_) {
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int x = protected_by_lock_;
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*pt_protected_by_lock_ = x;
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protected_by_lock_ = unprotected_;
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}
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const Lock& GetLock() RTC_LOCK_RETURNED(lock_) { return lock_; }
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Lock beforelock_ RTC_ACQUIRED_BEFORE(lock_);
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Lock lock_;
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Lock pt_lock_ RTC_ACQUIRED_AFTER(lock_);
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int unprotected_ = 0;
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int protected_by_lock_ RTC_GUARDED_BY(lock_) = 0;
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int* pt_protected_by_lock_ RTC_PT_GUARDED_BY(pt_lock_);
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};
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} // namespace
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TEST(ThreadAnnotationsTest, Test) {
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// This test ensure thread annotations doesn't break compilation.
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// Thus no run-time expectations.
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ThreadSafe t;
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t.LockInOrder();
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t.UnprotectedFunction();
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t.ReadProtected();
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t.WriteProtected();
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t.CallReadProtectedFunction();
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t.CallWriteProtectedFunction();
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}
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