Use mutex pointer instead of name for AssertLockHeld

This makes it useable for non-global locks such as the wallet and
keystore locks.

src/main.cpp

@@ -2238,7 +2238,7 @@ void PushGetBlocks(CNode* pnode, CBlockIndex* pindexBegin, uint256 hashEnd)
 
 bool ProcessBlock(CValidationState &state, CNode* pfrom, CBlock* pblock, CDiskBlockPos *dbp)
 {
-    AssertLockHeld("cs_main");
+    AssertLockHeld(cs_main);
 
     // Check for duplicate
     uint256 hash = pblock->GetHash();

src/sync.cpp

@@ -136,11 +136,11 @@ std::string LocksHeld()
     return result;
 }
 
-void AssertLockHeld(std::string strName)
+void AssertLockHeldInternal(const char *pszName, const char* pszFile, int nLine, void *cs)
 {
     BOOST_FOREACH(const PAIRTYPE(void*, CLockLocation)&i, *lockstack)
-        if (i.second.MutexName() == strName) return;
+        if (i.first == cs) return;
-    LogPrintf("Lock %s not held; locks held:\n%s", strName.c_str(), LocksHeld().c_str());
+    LogPrintf("Lock %s not held in %s:%i; locks held:\n%s", pszName, pszFile, nLine, LocksHeld().c_str());
     assert(0);
 }
 

src/sync.h

@@ -88,12 +88,13 @@ typedef AnnotatedMixin<boost::mutex> CWaitableCriticalSection;
 void EnterCritical(const char* pszName, const char* pszFile, int nLine, void* cs, bool fTry = false);
 void LeaveCritical();
 std::string LocksHeld();
-void AssertLockHeld(std::string strName);
+void AssertLockHeldInternal(const char* pszName, const char* pszFile, int nLine, 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 AssertLockHeld(std::string) {}
+void static inline AssertLockHeldInternal(const char* pszName, const char* pszFile, int nLine, void *cs) {}
 #endif
+#define AssertLockHeld(cs) AssertLockHeldInternal(#cs, __FILE__, __LINE__, &cs)
 
 #ifdef DEBUG_LOCKCONTENTION
 void PrintLockContention(const char* pszName, const char* pszFile, int nLine);