ArmA3 Mutex extension

mutexExtensionDll.cpp

#pragma once
#include <Windows.h>
#include <vector>
#include <mutex>
extern "C"
{
	__declspec(dllexport) void __stdcall RVExtension(char *output, int outputSize, const char *function);
};

std::vector<std::mutex*> mutexList;

bool lockMutex(size_t index)
{
	return mutexList[index]->try_lock();
}
bool unlockMutex(size_t index)
{
	mutexList[index]->unlock();
	return true;
}
bool toIndex(char c, size_t* out)
{
	(*out) = c - '0';
	return c < 10;
}

void __stdcall RVExtension(char *output, int outputSize, const char *function)
{
	/*
	 * Function:
	 *	c1 --> l | u
	 *	c2 --> 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
	 *
	 * Returns:
	 *	c1 --> t | f | e
	 *		t ==> true
	 *		f ==> false
	 *		e ==> error
	 */
	if (outputSize == 0)
		return;
	if (function[0] == '\0' || function[1] == '\0')
	{
		output[0] = 'e';
		output[1] = '\0';
	}
	switch (function[0])
	{
	case 'l':
		size_t index;
		if (!toIndex(function[1], &index))
		{
			output[0] = 'e';
			output[1] = '\0';
		}
		else
		{
			output[0] = (lockMutex(index) ? 't' : 'f');
			output[1] = '\0';
		}
		break;
	case 'u':
		size_t index;
		if (!toIndex(function[1], &index))
		{
			output[0] = 'e';
			output[1] = '\0';
		}
		else
		{
			output[0] = (unlockMutex(index) ? 't' : 'f');
			output[1] = '\0';
		}
		break;
	default:
		output[0] = 'e';
		output[1] = '\0';
		break;
	}
}

BOOL APIENTRY DllMain(HMODULE hModule, DWORD  ul_reason_for_call, LPVOID lpReserved)
{
	switch (ul_reason_for_call)
	{
	case DLL_PROCESS_ATTACH:
		mutexList.resize(10);
		for (int i = 0; i < mutexList.size(); i++)
		{
			mutexList[i] = new std::mutex();
		}
		break;
	//case DLL_THREAD_ATTACH:
	//case DLL_THREAD_DETACH:
	case DLL_PROCESS_DETACH:
		for (int i = 0; i < mutexList.size(); i++)
		{
			delete mutexList[i];
		}
		mutexList.clear();
		break;
	}
	return TRUE;
}