thread/PosixMutex: add "noexcept"

src/thread/PosixMutex.hxx

@@ -48,11 +48,11 @@ public:
 #else
 	/* slow fallback for pthread implementations that are not
 	   compatible with "constexpr" */
-	PosixMutex() {
+	PosixMutex() noexcept {
 		pthread_mutex_init(&mutex, nullptr);
 	}
 
-	~PosixMutex() {
+	~PosixMutex() noexcept {
 		pthread_mutex_destroy(&mutex);
 	}
 #endif
@@ -60,15 +60,15 @@ public:
 	PosixMutex(const PosixMutex &other) = delete;
 	PosixMutex &operator=(const PosixMutex &other) = delete;
 
-	void lock() {
+	void lock() noexcept {
 		pthread_mutex_lock(&mutex);
 	}
 
-	bool try_lock() {
+	bool try_lock() noexcept {
 		return pthread_mutex_trylock(&mutex) == 0;
 	}
 
-	void unlock() {
+	void unlock() noexcept {
 		pthread_mutex_unlock(&mutex);
 	}
 };