diff options
Diffstat (limited to 'src/sync.h')
-rw-r--r-- | src/sync.h | 112 |
1 files changed, 59 insertions, 53 deletions
diff --git a/src/sync.h b/src/sync.h index 11c1253757..40709bdd7f 100644 --- a/src/sync.h +++ b/src/sync.h @@ -46,14 +46,42 @@ LEAVE_CRITICAL_SECTION(mutex); // no RAII // // /////////////////////////////// +#ifdef DEBUG_LOCKORDER +void EnterCritical(const char* pszName, const char* pszFile, int nLine, void* cs, bool fTry = false); +void LeaveCritical(); +std::string LocksHeld(); +void AssertLockHeldInternal(const char* pszName, const char* pszFile, int nLine, void* cs) ASSERT_EXCLUSIVE_LOCK(cs); +void AssertLockNotHeldInternal(const char* pszName, const char* pszFile, int nLine, void* cs); +void DeleteLock(void* cs); + /** - * Template mixin that adds -Wthread-safety locking - * annotations to a subset of the mutex API. + * Call abort() if a potential lock order deadlock bug is detected, instead of + * just logging information and throwing a logic_error. Defaults to true, and + * set to false in DEBUG_LOCKORDER unit tests. + */ +extern bool g_debug_lockorder_abort; +#else +void static inline EnterCritical(const char* pszName, const char* pszFile, int nLine, void* cs, bool fTry = false) {} +void static inline LeaveCritical() {} +void static inline AssertLockHeldInternal(const char* pszName, const char* pszFile, int nLine, void* cs) ASSERT_EXCLUSIVE_LOCK(cs) {} +void static inline AssertLockNotHeldInternal(const char* pszName, const char* pszFile, int nLine, void* cs) {} +void static inline DeleteLock(void* cs) {} +#endif +#define AssertLockHeld(cs) AssertLockHeldInternal(#cs, __FILE__, __LINE__, &cs) +#define AssertLockNotHeld(cs) AssertLockNotHeldInternal(#cs, __FILE__, __LINE__, &cs) + +/** + * Template mixin that adds -Wthread-safety locking annotations and lock order + * checking to a subset of the mutex API. */ template <typename PARENT> class LOCKABLE AnnotatedMixin : public PARENT { public: + ~AnnotatedMixin() { + DeleteLock((void*)this); + } + void lock() EXCLUSIVE_LOCK_FUNCTION() { PARENT::lock(); @@ -68,64 +96,36 @@ public: { return PARENT::try_lock(); } -}; -#ifdef DEBUG_LOCKORDER -void EnterCritical(const char* pszName, const char* pszFile, int nLine, void* cs, bool fTry = false); -void LeaveCritical(); -std::string LocksHeld(); -void AssertLockHeldInternal(const char* pszName, const char* pszFile, int nLine, void* cs) ASSERT_EXCLUSIVE_LOCK(cs); -void AssertLockNotHeldInternal(const char* pszName, const char* pszFile, int nLine, void* cs); -void DeleteLock(void* cs); -#else -void static inline EnterCritical(const char* pszName, const char* pszFile, int nLine, void* cs, bool fTry = false) {} -void static inline LeaveCritical() {} -void static inline AssertLockHeldInternal(const char* pszName, const char* pszFile, int nLine, void* cs) ASSERT_EXCLUSIVE_LOCK(cs) {} -void static inline AssertLockNotHeldInternal(const char* pszName, const char* pszFile, int nLine, void* cs) {} -void static inline DeleteLock(void* cs) {} -#endif -#define AssertLockHeld(cs) AssertLockHeldInternal(#cs, __FILE__, __LINE__, &cs) -#define AssertLockNotHeld(cs) AssertLockNotHeldInternal(#cs, __FILE__, __LINE__, &cs) + using UniqueLock = std::unique_lock<PARENT>; +}; /** * Wrapped mutex: supports recursive locking, but no waiting * TODO: We should move away from using the recursive lock by default. */ -class CCriticalSection : public AnnotatedMixin<std::recursive_mutex> -{ -public: - ~CCriticalSection() { - DeleteLock((void*)this); - } -}; +typedef AnnotatedMixin<std::recursive_mutex> CCriticalSection; /** Wrapped mutex: supports waiting but not recursive locking */ -typedef AnnotatedMixin<std::mutex> CWaitableCriticalSection; - -/** Just a typedef for std::condition_variable, can be wrapped later if desired */ -typedef std::condition_variable CConditionVariable; - -/** Just a typedef for std::unique_lock, can be wrapped later if desired */ -typedef std::unique_lock<std::mutex> WaitableLock; +typedef AnnotatedMixin<std::mutex> Mutex; #ifdef DEBUG_LOCKCONTENTION void PrintLockContention(const char* pszName, const char* pszFile, int nLine); #endif -/** Wrapper around std::unique_lock<CCriticalSection> */ -class SCOPED_LOCKABLE CCriticalBlock +/** Wrapper around std::unique_lock style lock for Mutex. */ +template <typename Mutex, typename Base = typename Mutex::UniqueLock> +class SCOPED_LOCKABLE UniqueLock : public Base { private: - std::unique_lock<CCriticalSection> lock; - void Enter(const char* pszName, const char* pszFile, int nLine) { - EnterCritical(pszName, pszFile, nLine, (void*)(lock.mutex())); + EnterCritical(pszName, pszFile, nLine, (void*)(Base::mutex())); #ifdef DEBUG_LOCKCONTENTION - if (!lock.try_lock()) { + if (!Base::try_lock()) { PrintLockContention(pszName, pszFile, nLine); #endif - lock.lock(); + Base::lock(); #ifdef DEBUG_LOCKCONTENTION } #endif @@ -133,15 +133,15 @@ private: bool TryEnter(const char* pszName, const char* pszFile, int nLine) { - EnterCritical(pszName, pszFile, nLine, (void*)(lock.mutex()), true); - lock.try_lock(); - if (!lock.owns_lock()) + EnterCritical(pszName, pszFile, nLine, (void*)(Base::mutex()), true); + Base::try_lock(); + if (!Base::owns_lock()) LeaveCritical(); - return lock.owns_lock(); + return Base::owns_lock(); } public: - CCriticalBlock(CCriticalSection& mutexIn, const char* pszName, const char* pszFile, int nLine, bool fTry = false) EXCLUSIVE_LOCK_FUNCTION(mutexIn) : lock(mutexIn, std::defer_lock) + UniqueLock(Mutex& mutexIn, const char* pszName, const char* pszFile, int nLine, bool fTry = false) EXCLUSIVE_LOCK_FUNCTION(mutexIn) : Base(mutexIn, std::defer_lock) { if (fTry) TryEnter(pszName, pszFile, nLine); @@ -149,35 +149,41 @@ public: Enter(pszName, pszFile, nLine); } - CCriticalBlock(CCriticalSection* pmutexIn, const char* pszName, const char* pszFile, int nLine, bool fTry = false) EXCLUSIVE_LOCK_FUNCTION(pmutexIn) + UniqueLock(Mutex* pmutexIn, const char* pszName, const char* pszFile, int nLine, bool fTry = false) EXCLUSIVE_LOCK_FUNCTION(pmutexIn) { if (!pmutexIn) return; - lock = std::unique_lock<CCriticalSection>(*pmutexIn, std::defer_lock); + *static_cast<Base*>(this) = Base(*pmutexIn, std::defer_lock); if (fTry) TryEnter(pszName, pszFile, nLine); else Enter(pszName, pszFile, nLine); } - ~CCriticalBlock() UNLOCK_FUNCTION() + ~UniqueLock() UNLOCK_FUNCTION() { - if (lock.owns_lock()) + if (Base::owns_lock()) LeaveCritical(); } operator bool() { - return lock.owns_lock(); + return Base::owns_lock(); } }; +template<typename MutexArg> +using DebugLock = UniqueLock<typename std::remove_reference<typename std::remove_pointer<MutexArg>::type>::type>; + #define PASTE(x, y) x ## y #define PASTE2(x, y) PASTE(x, y) -#define LOCK(cs) CCriticalBlock PASTE2(criticalblock, __COUNTER__)(cs, #cs, __FILE__, __LINE__) -#define LOCK2(cs1, cs2) CCriticalBlock criticalblock1(cs1, #cs1, __FILE__, __LINE__), criticalblock2(cs2, #cs2, __FILE__, __LINE__) -#define TRY_LOCK(cs, name) CCriticalBlock name(cs, #cs, __FILE__, __LINE__, true) +#define LOCK(cs) DebugLock<decltype(cs)> PASTE2(criticalblock, __COUNTER__)(cs, #cs, __FILE__, __LINE__) +#define LOCK2(cs1, cs2) \ + DebugLock<decltype(cs1)> criticalblock1(cs1, #cs1, __FILE__, __LINE__); \ + DebugLock<decltype(cs2)> criticalblock2(cs2, #cs2, __FILE__, __LINE__); +#define TRY_LOCK(cs, name) DebugLock<decltype(cs)> name(cs, #cs, __FILE__, __LINE__, true) +#define WAIT_LOCK(cs, name) DebugLock<decltype(cs)> name(cs, #cs, __FILE__, __LINE__) #define ENTER_CRITICAL_SECTION(cs) \ { \ |