Add a mutex to the logger so multiple threads can safely log messages (#65)

Author: Zarklord

Spore ModAPI/SourceCode/DLL/Application.cpp

@@ -64,6 +64,7 @@ namespace ModAPI
 	eastl::fixed_vector<InitFunction, MAX_MODS> disposeFunctions;
 	eastl::fixed_map<uint32_t, ISimulatorStrategyPtr, MAX_MODS> simulatorStrategies;
 	FileStreamPtr logFile{};
+	std::mutex logFileMutex;
 	__time64_t logFileStartTime;
 
 	uint32_t CRC_TABLE[256];
@@ -197,15 +198,19 @@ void CreateLogFile() {
 	log_file_name += u".txt";
 	log_path.append(log_file_name);
 
+	ModAPI::logFileMutex.lock();
 	ModAPI::logFile = new IO::FileStream(log_path.c_str());
 	ModAPI::logFile->Open(IO::AccessFlags::Write, IO::CD::CreateAlways);
+	ModAPI::logFileMutex.unlock();
 }
 
 void CloseLogFile() {
+	ModAPI::logFileMutex.lock();
 	if (ModAPI::logFile) {
 		ModAPI::logFile->Close();
 		ModAPI::logFile.reset();
 	}
+	ModAPI::logFileMutex.unlock();
 }
 
 int ModAPI::PreInit_detour::DETOUR(int arg_0, int arg_1)

Spore ModAPI/SourceCode/DLL/Application.h

@@ -14,6 +14,7 @@
 #include <Spore\Cheats.h>
 #include <Spore\IO.h>
 #include <ctime>
+#include <mutex>
 
 virtual_detour(ShaderFragments_detour, Graphics::cMaterialManager, Graphics::IMaterialManager, bool(Resource::Database*)) {};
 
@@ -28,6 +29,7 @@ namespace ModAPI
 
 	extern FileStreamPtr logFile;
 	extern __time64_t logFileStartTime;
+	extern std::mutex logFileMutex;
 
 	long AttachDetour();
 	void DetachDetour();

Spore ModAPI/SourceCode/DLL/DllModAPI.cpp

@@ -32,9 +32,7 @@ namespace ModAPI
 	static constexpr unsigned int SCRATCH_SIZE = 4096;
 	char logScratch[SCRATCH_SIZE];
 
-	void Log(const char* fmt, ...) {
-		unsigned int offset = 0;
-		
+	void Log(const char* fmt, ...) {		
 		__time64_t long_time;
 		_time64(&long_time);
 
@@ -47,25 +45,31 @@ namespace ModAPI
 		const int mins = long_time % 60;
 		long_time /= 60;
 		const int hours = long_time % 24;
+		
+		logFileMutex.lock();
 
-		sprintf_s(logScratch + offset, SCRATCH_SIZE - offset, format, hours,mins,secs);
-		offset += (sizeof(formatted)-1)/sizeof(formatted[0]);
+		sprintf_s(logScratch, SCRATCH_SIZE, format, hours,mins,secs);
+		unsigned int time_offset = (sizeof(formatted)-1)/sizeof(formatted[0]);
 
 		va_list argList;
 		va_start(argList, fmt);
-		vsnprintf(logScratch + offset, SCRATCH_SIZE - offset, fmt, argList);
+		vsnprintf(logScratch + time_offset, SCRATCH_SIZE - time_offset, fmt, argList);
 		va_end(argList);
 
 		// vsnprintf does not guarantee a null terminator if the formatted string exceeds the buffer size
 		logScratch[SCRATCH_SIZE - 1] = 0;
 
+		auto log_len = strlen(logScratch);
+
 		if (logFile)
 		{
-			logFile->Write(logScratch, strlen(logScratch));
+			logFile->Write(logScratch, log_len);
 			logFile->Write("\n", 1);
 			logFile->Flush();
 		}
-		App::ConsolePrintF(logScratch + offset);
+		App::ConsolePrintF(logScratch + time_offset);
+		memset(logScratch, 0, log_len);
+		logFileMutex.unlock();
 	}
 
 	bool AddSimulatorStrategy(Simulator::ISimulatorStrategy* strategy, uint32_t id) {