thread/Thread: throw std::system_error on error

src/input/ThreadInputStream.cxx

@@ -44,8 +44,8 @@ ThreadInputStream::~ThreadInputStream()
 	}
 }
 
-InputStream *
-ThreadInputStream::Start(Error &error)
+void
+ThreadInputStream::Start()
 {
 	assert(buffer == nullptr);
 
@@ -53,11 +53,7 @@ ThreadInputStream::Start(Error &error)
 	assert(p != nullptr);
 
 	buffer = new CircularBuffer<uint8_t>((uint8_t *)p, buffer_size);
-
-	if (!thread.Start(ThreadFunc, this, error))
-		return nullptr;
-
-	return this;
+	thread.Start(ThreadFunc, this);
 }
 
 inline void

src/input/ThreadInputStream.hxx

@@ -78,10 +78,8 @@ public:
 
 	/**
 	 * Initialize the object and start the thread.
-	 *
-	 * @return false on error
 	 */
-	InputStream *Start(Error &error);
+	void Start();
 
 	/* virtual methods from InputStream */
 	bool Check(Error &error) override final;

src/input/plugins/MmsInputPlugin.cxx

@@ -73,7 +73,7 @@ MmsInputStream::Open(Error &error)
 static InputStream *
 input_mms_open(const char *url,
 	       Mutex &mutex, Cond &cond,
-	       Error &error)
+	       gcc_unused Error &error)
 {
 	if (!StringStartsWith(url, "mms://") &&
 	    !StringStartsWith(url, "mmsh://") &&
@@ -82,11 +82,8 @@ input_mms_open(const char *url,
 		return nullptr;
 
 	auto m = new MmsInputStream(url, mutex, cond);
-	auto is = m->Start(error);
-	if (is == nullptr)
-		delete m;
-
-	return is;
+	m->Start();
+	return m;
 }
 
 size_t