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sync.h: add REVERSE_LOCK

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This commit is contained in:
Anthony Towns
2020-03-01 14:22:37 +10:00
parent 306f71b4eb
commit b9c4260127
3 changed files with 94 additions and 9 deletions
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39
src/sync.h
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@@ -50,6 +50,7 @@ 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();
void CheckLastCritical(void* cs, std::string& lockname, const char* guardname, const char* file, int line);
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);
@@ -64,6 +65,7 @@ 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 CheckLastCritical(void* cs, std::string& lockname, const char* guardname, const char* file, int line) {}
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) {}
@@ -171,8 +173,45 @@ public:
{
return Base::owns_lock();
}
protected:
// needed for reverse_lock
UniqueLock() { }
public:
/**
* An RAII-style reverse lock. Unlocks on construction and locks on destruction.
*/
class reverse_lock {
public:
explicit reverse_lock(UniqueLock& _lock, const char* _guardname, const char* _file, int _line) : lock(_lock), file(_file), line(_line) {
CheckLastCritical((void*)lock.mutex(), lockname, _guardname, _file, _line);
lock.unlock();
LeaveCritical();
lock.swap(templock);
}
~reverse_lock() {
templock.swap(lock);
EnterCritical(lockname.c_str(), file.c_str(), line, (void*)lock.mutex());
lock.lock();
}
private:
reverse_lock(reverse_lock const&);
reverse_lock& operator=(reverse_lock const&);
UniqueLock& lock;
UniqueLock templock;
std::string lockname;
const std::string file;
const int line;
};
friend class reverse_lock;
};
#define REVERSE_LOCK(g) decltype(g)::reverse_lock PASTE2(revlock, __COUNTER__)(g, #g, __FILE__, __LINE__)
template<typename MutexArg>
using DebugLock = UniqueLock<typename std::remove_reference<typename std::remove_pointer<MutexArg>::type>::type>;