maxmustermann/dogecoin
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

Make LOCK, LOCK2, TRY_LOCK work with CWaitableCriticalSection

Browse source 
They should also work with any other mutex type which std::unique_lock
supports.

There is no change in behavior for current code that calls these macros with
CCriticalSection mutexes.
This commit is contained in:
Russell Yanofsky 2017-11-08 16:21:13 -05:00
parent ba1f095aad
commit 1382913e61
2 changed files with 53 additions and 37 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

61
src/sync.h
View file

@ -71,13 +71,17 @@ void static inline DeleteLock(void* cs) {}
#define AssertLockNotHeld(cs) AssertLockNotHeldInternal(#cs, __FILE__, __LINE__, &cs)
/**
* Template mixin that adds -Wthread-safety locking
* annotations to a subset of the mutex API.
* 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();
@ -92,19 +96,15 @@ public:
{
return PARENT::try_lock();
}
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;
@ -119,20 +119,19 @@ typedef std::unique_lock<std::mutex> WaitableLock;
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 CCriticalBlock : 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
@ -140,15 +139,15 @@ 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)
CCriticalBlock(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);
@ -156,11 +155,11 @@ public:
Enter(pszName, pszFile, nLine);
}
CCriticalBlock(CCriticalSection* pmutexIn, const char* pszName, const char* pszFile, int nLine, bool fTry = false) EXCLUSIVE_LOCK_FUNCTION(pmutexIn)
CCriticalBlock(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
@ -169,22 +168,28 @@ public:
~CCriticalBlock() 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 = CCriticalBlock<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) \
{ \

29
src/test/sync_tests.cpp
View file

@ -7,16 +7,10 @@
#include <boost/test/unit_test.hpp>
BOOST_FIXTURE_TEST_SUITE(sync_tests, BasicTestingSetup)
BOOST_AUTO_TEST_CASE(potential_deadlock_detected)
namespace {
template <typename MutexType>
void TestPotentialDeadLockDetected(MutexType& mutex1, MutexType& mutex2)
{
#ifdef DEBUG_LOCKORDER
bool prev = g_debug_lockorder_abort;
g_debug_lockorder_abort = false;
#endif
CCriticalSection mutex1, mutex2;
{
LOCK2(mutex1, mutex2);
}
@ -32,6 +26,23 @@ BOOST_AUTO_TEST_CASE(potential_deadlock_detected)
#else
BOOST_CHECK(!error_thrown);
#endif
}
} // namespace
BOOST_FIXTURE_TEST_SUITE(sync_tests, BasicTestingSetup)
BOOST_AUTO_TEST_CASE(potential_deadlock_detected)
{
#ifdef DEBUG_LOCKORDER
bool prev = g_debug_lockorder_abort;
g_debug_lockorder_abort = false;
#endif
CCriticalSection rmutex1, rmutex2;
TestPotentialDeadLockDetected(rmutex1, rmutex2);
CWaitableCriticalSection mutex1, mutex2;
TestPotentialDeadLockDetected(mutex1, mutex2);
#ifdef DEBUG_LOCKORDER
g_debug_lockorder_abort = prev;