event/Call, ...: use wait() with predicate

src/event/Call.cxx

@@ -53,8 +53,7 @@ public:
 
 		{
 			std::unique_lock<Mutex> lock(mutex);
-			while (!done)
-				cond.wait(lock);
+			cond.wait(lock, [this]{ return done; });
 		}
 
 		if (exception)

src/input/AsyncInputStream.cxx

@@ -136,8 +136,8 @@ AsyncInputStream::Seek(std::unique_lock<Mutex> &lock,
 
 	CondInputStreamHandler cond_handler;
 	const ScopeExchangeInputStreamHandler h(*this, &cond_handler);
-	while (seek_state != SeekState::NONE)
-		cond_handler.cond.wait(lock);
+	cond_handler.cond.wait(lock,
+			       [this]{ return seek_state == SeekState::NONE; });
 
 	Check();
 }

src/input/BufferedInputStream.cxx

@@ -84,8 +84,7 @@ BufferedInputStream::Seek(std::unique_lock<Mutex> &lock,
 	seek = true;
 	wake_cond.notify_one();
 
-	while (seek)
-		client_cond.wait(lock);
+	client_cond.wait(lock, [this]{ return !seek; });
 
 	if (seek_error)
 		std::rethrow_exception(std::exchange(seek_error, {}));

src/input/Open.cxx

@@ -59,13 +59,10 @@ InputStream::OpenReady(const char *uri, Mutex &mutex)
 	{
 		std::unique_lock<Mutex> lock(mutex);
 
-		while (true) {
+		handler.cond.wait(lock, [&is]{
 			is->Update();
-			if (is->IsReady())
-				break;
-
-			handler.cond.wait(lock);
-		}
+			return is->IsReady();
+		});
 
 		is->Check();
 	}

src/input/ProxyInputStream.cxx

@@ -92,8 +92,7 @@ void
 ProxyInputStream::Seek(std::unique_lock<Mutex> &lock,
 		       offset_type new_offset)
 {
-	while (!input)
-		set_input_cond.wait(lock);
+	set_input_cond.wait(lock, [this]{ return !!input; });
 
 	input->Seek(lock, new_offset);
 	CopyAttributes();
@@ -124,8 +123,7 @@ size_t
 ProxyInputStream::Read(std::unique_lock<Mutex> &lock,
 		       void *ptr, size_t read_size)
 {
-	while (!input)
-		set_input_cond.wait(lock);
+	set_input_cond.wait(lock, [this]{ return !!input; });
 
 	size_t nbytes = input->Read(lock, ptr, read_size);
 	CopyAttributes();

src/output/Control.cxx

@@ -114,8 +114,7 @@ AudioOutputControl::LockToggleEnabled() noexcept
 void
 AudioOutputControl::WaitForCommand(std::unique_lock<Mutex> &lock) noexcept
 {
-	while (!IsCommandFinished())
-		client_cond.wait(lock);
+	client_cond.wait(lock, [this]{ return IsCommandFinished(); });
 }
 
 void

src/output/plugins/AlsaOutputPlugin.cxx

@@ -805,8 +805,7 @@ AlsaOutput::Drain()
 
 	Activate();
 
-	while (drain && active)
-		cond.wait(lock);
+	cond.wait(lock, [this]{ return !drain || !active; });
 
 	if (error)
 		std::rethrow_exception(error);

src/output/plugins/httpd/HttpdOutputPlugin.cxx

@@ -278,8 +278,7 @@ HttpdOutput::BroadcastFromEncoder()
 	/* synchronize with the IOThread */
 	{
 		std::unique_lock<Mutex> lock(mutex);
-		while (!pages.empty())
-			cond.wait(lock);
+		cond.wait(lock, [this]{ return pages.empty(); });
 	}
 
 	bool empty = true;

src/output/plugins/sles/SlesOutputPlugin.cxx

@@ -321,10 +321,10 @@ SlesOutput::Play(const void *chunk, size_t size)
 
 	assert(filled < BUFFER_SIZE);
 
-	while (n_queued == N_BUFFERS) {
+	cond.wait(lock, [this]{
 		assert(filled == 0);
-		cond.wait(lock);
-	}
+		return n_queued != N_BUFFERS;
+	});
 
 	size_t nbytes = std::min(BUFFER_SIZE - filled, size);
 	memcpy(buffers[next] + filled, chunk, nbytes);
@@ -350,8 +350,7 @@ SlesOutput::Drain()
 
 	assert(filled < BUFFER_SIZE);
 
-	while (n_queued > 0)
-		cond.wait(lock);
+	cond.wait(lock, [this]{ return n_queued == 0; });
 }
 
 void

src/storage/plugins/CurlStorage.cxx

@@ -125,8 +125,7 @@ public:
 
 	void Wait() {
 		std::unique_lock<Mutex> lock(mutex);
-		while (!done)
-			cond.wait(lock);
+		cond.wait(lock, [this]{ return done; });
 
 		if (postponed_error)
 			std::rethrow_exception(postponed_error);

src/storage/plugins/UdisksStorage.cxx

@@ -209,8 +209,7 @@ UdisksStorage::MountWait()
 		defer_mount.Schedule();
 	}
 
-	while (want_mount)
-		cond.wait(lock);
+	cond.wait(lock, [this]{ return !want_mount; });
 
 	if (mount_error)
 		std::rethrow_exception(mount_error);
@@ -280,8 +279,7 @@ UdisksStorage::UnmountWait()
 
 	defer_unmount.Schedule();
 
-	while (mounted_storage)
-		cond.wait(lock);
+	cond.wait(lock, [this]{ return !mounted_storage; });
 
 	if (mount_error)
 		std::rethrow_exception(mount_error);

test/run_input.cxx

@@ -176,8 +176,7 @@ class DumpRemoteTagHandler final : public RemoteTagHandler {
 public:
 	Tag Wait() {
 		std::unique_lock<Mutex> lock(mutex);
-		while (!done)
-			cond.wait(lock);
+		cond.wait(lock, [this]{ return done; });
 
 		if (error)
 			std::rethrow_exception(error);