Replace all uses of AMTL threads with STL threads.

This also rewrites the work loop for threaded queries. It has been
simplified significantly.

extensions/mysql/mysql/MyDatabase.cpp

@@ -277,17 +277,13 @@ IPreparedQuery *MyDatabase::PrepareQuery(const char *query, char *error, size_t
 
 bool MyDatabase::LockForFullAtomicOperation()
 {
-	if (!m_FullLock)
-		m_FullLock = new ke::Mutex();
-
-	m_FullLock->Lock();
+	m_FullLock.lock();
 	return true;
 }
 
 void MyDatabase::UnlockFromFullAtomicOperation()
 {
-	if (m_FullLock)
-		m_FullLock->Unlock();
+	m_FullLock.unlock();
 }
 
 IDBDriver *MyDatabase::GetDriver()

extensions/mysql/mysql/MyDatabase.h

@@ -32,8 +32,8 @@
 #ifndef _INCLUDE_SM_MYSQL_DATABASE_H_
 #define _INCLUDE_SM_MYSQL_DATABASE_H_
 
-#include <am-thread-utils.h>
 #include <am-refcounting-threadsafe.h>
+#include <mutex>
 #include "MyDriver.h"
 
 class MyQuery;
@@ -70,7 +70,7 @@ public:
 	const DatabaseInfo &GetInfo();
 private:
 	MYSQL *m_mysql;
-	ke::AutoPtr<ke::Mutex> m_FullLock;
+	std::mutex m_FullLock;
 
 	/* ---------- */
 	DatabaseInfo m_Info;

extensions/mysql/mysql/MyDriver.cpp

@@ -160,7 +160,7 @@ bool CompareField(const char *str1, const char *str2)
 
 IDatabase *MyDriver::Connect(const DatabaseInfo *info, bool persistent, char *error, size_t maxlength)
 {
-	ke::AutoLock lock(&m_Lock);
+	std::lock_guard<std::mutex> lock(m_Lock);
 
 	if (persistent)
 	{
@@ -202,7 +202,7 @@ IDatabase *MyDriver::Connect(const DatabaseInfo *info, bool persistent, char *er
 
 void MyDriver::RemoveFromList(MyDatabase *pdb, bool persistent)
 {
-	ke::AutoLock lock(&m_Lock);
+	std::lock_guard<std::mutex> lock(m_Lock);
 	if (persistent)
 	{
 		m_PermDbs.remove(pdb);

extensions/mysql/mysql/MyDriver.h

@@ -45,7 +45,8 @@
 
 #include <sh_string.h>
 #include <sh_list.h>
-#include <am-thread-utils.h>
+
+#include <mutex>
 
 using namespace SourceMod;
 using namespace SourceHook;
@@ -71,7 +72,7 @@ public:
 	void Shutdown();
 	void RemoveFromList(MyDatabase *pdb, bool persistent);
 private:
-	ke::Mutex m_Lock;
+	std::mutex m_Lock;
 	Handle_t m_MyHandle;
 	List<MyDatabase *> m_TempDbs;
 	List<MyDatabase *> m_PermDbs;