diff --git a/src/thread/CriticalSection.hxx b/src/thread/CriticalSection.hxx
index eb3f5c5fe..1a55d3aca 100644
--- a/src/thread/CriticalSection.hxx
+++ b/src/thread/CriticalSection.hxx
@@ -41,26 +41,26 @@ class CriticalSection {
 	CRITICAL_SECTION critical_section;
 
 public:
-	CriticalSection() {
+	CriticalSection() noexcept {
 		::InitializeCriticalSection(&critical_section);
 	}
 
-	~CriticalSection() {
+	~CriticalSection() noexcept {
 		::DeleteCriticalSection(&critical_section);
 	}
 
 	CriticalSection(const CriticalSection &other) = delete;
 	CriticalSection &operator=(const CriticalSection &other) = delete;
 
-	void lock() {
+	void lock() noexcept {
 		::EnterCriticalSection(&critical_section);
 	};
 
-	bool try_lock() {
+	bool try_lock() noexcept {
 		return ::TryEnterCriticalSection(&critical_section) != 0;
 	};
 
-	void unlock() {
+	void unlock() noexcept {
 		::LeaveCriticalSection(&critical_section);
 	}
 };
diff --git a/src/thread/Id.hxx b/src/thread/Id.hxx
index 4b0b9109e..217a39e72 100644
--- a/src/thread/Id.hxx
+++ b/src/thread/Id.hxx
@@ -44,12 +44,12 @@ public:
 	/**
 	 * No initialisation.
 	 */
-	ThreadId() = default;
+	ThreadId() noexcept = default;
 
 #ifdef WIN32
-	constexpr ThreadId(DWORD _id):id(_id) {}
+	constexpr ThreadId(DWORD _id) noexcept:id(_id) {}
 #else
-	constexpr ThreadId(pthread_t _id):id(_id) {}
+	constexpr ThreadId(pthread_t _id) noexcept:id(_id) {}
 #endif
 
 	gcc_const
diff --git a/src/thread/Mutex.hxx b/src/thread/Mutex.hxx
index f3064387c..530ff9697 100644
--- a/src/thread/Mutex.hxx
+++ b/src/thread/Mutex.hxx
@@ -52,11 +52,11 @@ class ScopeUnlock {
 	Mutex &mutex;
 
 public:
-	explicit ScopeUnlock(Mutex &_mutex):mutex(_mutex) {
+	explicit ScopeUnlock(Mutex &_mutex) noexcept:mutex(_mutex) {
 		mutex.unlock();
 	};
 
-	~ScopeUnlock() {
+	~ScopeUnlock() noexcept {
 		mutex.lock();
 	}
 
diff --git a/src/thread/Name.hxx b/src/thread/Name.hxx
index 20560bfbb..70dbd59c2 100644
--- a/src/thread/Name.hxx
+++ b/src/thread/Name.hxx
@@ -35,7 +35,7 @@
 #endif
 
 static inline void
-SetThreadName(const char *name)
+SetThreadName(const char *name) noexcept
 {
 #if defined(HAVE_PTHREAD_SETNAME_NP) && !defined(__NetBSD__)
 	/* not using pthread_setname_np() on NetBSD because it
@@ -56,7 +56,7 @@ SetThreadName(const char *name)
 
 template<typename... Args>
 static inline void
-FormatThreadName(const char *fmt, gcc_unused Args&&... args)
+FormatThreadName(const char *fmt, gcc_unused Args&&... args) noexcept
 {
 #ifdef HAVE_THREAD_NAME
 	char buffer[16];
diff --git a/src/thread/PosixCond.hxx b/src/thread/PosixCond.hxx
index 7da71df38..e1c272071 100644
--- a/src/thread/PosixCond.hxx
+++ b/src/thread/PosixCond.hxx
@@ -46,15 +46,15 @@ public:
 #ifdef __GLIBC__
 	/* optimized constexpr constructor for pthread implementations
 	   that support it */
-	constexpr PosixCond():cond(PTHREAD_COND_INITIALIZER) {}
+	constexpr PosixCond() noexcept:cond(PTHREAD_COND_INITIALIZER) {}
 #else
 	/* slow fallback for pthread implementations that are not
 	   compatible with "constexpr" */
-	PosixCond() {
+	PosixCond() noexcept {
 		pthread_cond_init(&cond, nullptr);
 	}
 
-	~PosixCond() {
+	~PosixCond() noexcept {
 		pthread_cond_destroy(&cond);
 	}
 #endif
@@ -62,20 +62,20 @@ public:
 	PosixCond(const PosixCond &other) = delete;
 	PosixCond &operator=(const PosixCond &other) = delete;
 
-	void signal() {
+	void signal() noexcept {
 		pthread_cond_signal(&cond);
 	}
 
-	void broadcast() {
+	void broadcast() noexcept {
 		pthread_cond_broadcast(&cond);
 	}
 
-	void wait(PosixMutex &mutex) {
+	void wait(PosixMutex &mutex) noexcept {
 		pthread_cond_wait(&cond, &mutex.mutex);
 	}
 
 private:
-	bool timed_wait(PosixMutex &mutex, unsigned timeout_ms) {
+	bool timed_wait(PosixMutex &mutex, unsigned timeout_ms) noexcept {
 		struct timeval now;
 		gettimeofday(&now, nullptr);
 
@@ -93,7 +93,7 @@ private:
 
 public:
 	bool timed_wait(PosixMutex &mutex,
-			std::chrono::steady_clock::duration timeout) {
+			std::chrono::steady_clock::duration timeout) noexcept {
 		auto timeout_ms = std::chrono::duration_cast<std::chrono::milliseconds>(timeout).count();
 		if (timeout_ms < 0)
 			timeout_ms = 0;
diff --git a/src/thread/Slack.hxx b/src/thread/Slack.hxx
index 1234e1fe9..d1bb49c1e 100644
--- a/src/thread/Slack.hxx
+++ b/src/thread/Slack.hxx
@@ -30,7 +30,7 @@
  * merge multiple wakeups, which is a trick to save energy.
  */
 static inline void
-SetThreadTimerSlackNS(unsigned long slack_ns)
+SetThreadTimerSlackNS(unsigned long slack_ns) noexcept
 {
 #if defined(HAVE_PRCTL) && defined(PR_SET_TIMERSLACK)
 	prctl(PR_SET_TIMERSLACK, slack_ns, 0, 0, 0);
@@ -40,13 +40,13 @@ SetThreadTimerSlackNS(unsigned long slack_ns)
 }
 
 static inline void
-SetThreadTimerSlackUS(unsigned long slack_us)
+SetThreadTimerSlackUS(unsigned long slack_us) noexcept
 {
 	SetThreadTimerSlackNS(slack_us * 1000ul);
 }
 
 static inline void
-SetThreadTimerSlackMS(unsigned long slack_ms)
+SetThreadTimerSlackMS(unsigned long slack_ms) noexcept
 {
 	SetThreadTimerSlackNS(slack_ms * 1000000ul);
 }
diff --git a/src/thread/Thread.cxx b/src/thread/Thread.cxx
index 69b7333bf..3b6da667d 100644
--- a/src/thread/Thread.cxx
+++ b/src/thread/Thread.cxx
@@ -56,7 +56,7 @@ Thread::Start()
 }
 
 void
-Thread::Join()
+Thread::Join() noexcept
 {
 	assert(IsDefined());
 	assert(!IsInside());
@@ -72,7 +72,7 @@ Thread::Join()
 }
 
 inline void
-Thread::Run()
+Thread::Run() noexcept
 {
 #ifndef WIN32
 #ifndef NDEBUG
@@ -94,7 +94,7 @@ Thread::Run()
 #ifdef WIN32
 
 DWORD WINAPI
-Thread::ThreadProc(LPVOID ctx)
+Thread::ThreadProc(LPVOID ctx) noexcept
 {
 	Thread &thread = *(Thread *)ctx;
 
@@ -105,7 +105,7 @@ Thread::ThreadProc(LPVOID ctx)
 #else
 
 void *
-Thread::ThreadProc(void *ctx)
+Thread::ThreadProc(void *ctx) noexcept
 {
 	Thread &thread = *(Thread *)ctx;
 
diff --git a/src/thread/Thread.hxx b/src/thread/Thread.hxx
index 0251f46ec..cbf3310d0 100644
--- a/src/thread/Thread.hxx
+++ b/src/thread/Thread.hxx
@@ -54,19 +54,19 @@ class Thread {
 #endif
 
 public:
-	explicit Thread(Function _f):f(_f) {}
+	explicit Thread(Function _f) noexcept:f(_f) {}
 
 	Thread(const Thread &) = delete;
 
 #ifndef NDEBUG
-	~Thread() {
+	~Thread() noexcept {
 		/* all Thread objects must be destructed manually by calling
 		   Join(), to clean up */
 		assert(!IsDefined());
 	}
 #endif
 
-	bool IsDefined() const {
+	bool IsDefined() const noexcept {
 #ifdef WIN32
 		return handle != nullptr;
 #else
@@ -91,15 +91,15 @@ public:
 	}
 
 	void Start();
-	void Join();
+	void Join() noexcept;
 
 private:
-	void Run();
+	void Run() noexcept;
 
 #ifdef WIN32
-	static DWORD WINAPI ThreadProc(LPVOID ctx);
+	static DWORD WINAPI ThreadProc(LPVOID ctx) noexcept;
 #else
-	static void *ThreadProc(void *ctx);
+	static void *ThreadProc(void *ctx) noexcept;
 #endif
 
 };
diff --git a/src/thread/Util.cxx b/src/thread/Util.cxx
index 16fb1be7a..34c6b5380 100644
--- a/src/thread/Util.cxx
+++ b/src/thread/Util.cxx
@@ -41,13 +41,13 @@
 #ifdef __linux__
 
 static int
-ioprio_set(int which, int who, int ioprio)
+ioprio_set(int which, int who, int ioprio) noexcept
 {
 	return syscall(__NR_ioprio_set, which, who, ioprio);
 }
 
 static void
-ioprio_set_idle()
+ioprio_set_idle() noexcept
 {
 	static constexpr int _IOPRIO_WHO_PROCESS = 1;
 	static constexpr int _IOPRIO_CLASS_IDLE = 3;
@@ -61,7 +61,7 @@ ioprio_set_idle()
 #endif
 
 void
-SetThreadIdlePriority()
+SetThreadIdlePriority() noexcept
 {
 #ifdef __linux__
 #ifdef SCHED_IDLE
diff --git a/src/thread/Util.hxx b/src/thread/Util.hxx
index ed5b91bde..ce1c0fbb4 100644
--- a/src/thread/Util.hxx
+++ b/src/thread/Util.hxx
@@ -34,7 +34,7 @@
  * Lower the current thread's priority to "idle" (very low).
  */
 void
-SetThreadIdlePriority();
+SetThreadIdlePriority() noexcept;
 
 /**
  * Raise the current thread's priority to "real-time" (very high).
diff --git a/src/thread/WindowsCond.hxx b/src/thread/WindowsCond.hxx
index d01ee3a1d..108f38c81 100644
--- a/src/thread/WindowsCond.hxx
+++ b/src/thread/WindowsCond.hxx
@@ -41,35 +41,35 @@ class WindowsCond {
 	CONDITION_VARIABLE cond;
 
 public:
-	WindowsCond() {
+	WindowsCond() noexcept {
 		InitializeConditionVariable(&cond);
 	}
 
 	WindowsCond(const WindowsCond &other) = delete;
 	WindowsCond &operator=(const WindowsCond &other) = delete;
 
-	void signal() {
+	void signal() noexcept {
 		WakeConditionVariable(&cond);
 	}
 
-	void broadcast() {
+	void broadcast() noexcept {
 		WakeAllConditionVariable(&cond);
 	}
 
 private:
-	bool timed_wait(CriticalSection &mutex, DWORD timeout_ms) {
+	bool timed_wait(CriticalSection &mutex, DWORD timeout_ms) noexcept {
 		return SleepConditionVariableCS(&cond, &mutex.critical_section,
 						timeout_ms);
 	}
 
 public:
 	bool timed_wait(CriticalSection &mutex,
-			std::chrono::steady_clock::duration timeout) {
+			std::chrono::steady_clock::duration timeout) noexcept {
 		auto timeout_ms = std::chrono::duration_cast<std::chrono::milliseconds>(timeout).count();
 		return timed_wait(mutex, timeout_ms);
 	}
 
-	void wait(CriticalSection &mutex) {
+	void wait(CriticalSection &mutex) noexcept {
 		timed_wait(mutex, INFINITE);
 	}
 };