diff options
Diffstat (limited to 'media/libcubeb/src/cubeb_log.cpp')
-rw-r--r-- | media/libcubeb/src/cubeb_log.cpp | 144 |
1 files changed, 0 insertions, 144 deletions
diff --git a/media/libcubeb/src/cubeb_log.cpp b/media/libcubeb/src/cubeb_log.cpp deleted file mode 100644 index 54c7f4a15..000000000 --- a/media/libcubeb/src/cubeb_log.cpp +++ /dev/null @@ -1,144 +0,0 @@ -/* - * Copyright © 2016 Mozilla Foundation - * - * This program is made available under an ISC-style license. See the - * accompanying file LICENSE for details. - */ -#define NOMINMAX - -#include "cubeb_log.h" -#include "cubeb_ringbuffer.h" -#include <cstdarg> -#ifdef _WIN32 -#include <windows.h> -#else -#include <time.h> -#endif - -cubeb_log_level g_cubeb_log_level; -cubeb_log_callback g_cubeb_log_callback; - -/** The maximum size of a log message, after having been formatted. */ -const size_t CUBEB_LOG_MESSAGE_MAX_SIZE = 256; -/** The maximum number of log messages that can be queued before dropping - * messages. */ -const size_t CUBEB_LOG_MESSAGE_QUEUE_DEPTH = 40; -/** Number of milliseconds to wait before dequeuing log messages. */ -#define CUBEB_LOG_BATCH_PRINT_INTERVAL_MS 10 - -/** - * This wraps an inline buffer, that represents a log message, that must be - * null-terminated. - * This class should not use system calls or other potentially blocking code. - */ -class cubeb_log_message -{ -public: - cubeb_log_message() - { - *storage = '\0'; - } - cubeb_log_message(char const str[CUBEB_LOG_MESSAGE_MAX_SIZE]) - { - size_t length = strlen(str); - /* paranoia against malformed message */ - assert(length < CUBEB_LOG_MESSAGE_MAX_SIZE); - if (length > CUBEB_LOG_MESSAGE_MAX_SIZE - 1) { - return; - } - PodCopy(storage, str, length); - storage[length] = '\0'; - } - char const * get() { - return storage; - } -private: - char storage[CUBEB_LOG_MESSAGE_MAX_SIZE]; -}; - -/** Lock-free asynchronous logger, made so that logging from a - * real-time audio callback does not block the audio thread. */ -class cubeb_async_logger -{ -public: - /* This is thread-safe since C++11 */ - static cubeb_async_logger & get() { - static cubeb_async_logger instance; - return instance; - } - void push(char const str[CUBEB_LOG_MESSAGE_MAX_SIZE]) - { - cubeb_log_message msg(str); - msg_queue.enqueue(msg); - } - void run() - { - std::thread([this]() { - while (true) { - cubeb_log_message msg; - while (msg_queue.dequeue(&msg, 1)) { - LOGV("%s", msg.get()); - } -#ifdef _WIN32 - Sleep(CUBEB_LOG_BATCH_PRINT_INTERVAL_MS); -#else - timespec sleep_duration = sleep_for; - timespec remainder; - do { - if (nanosleep(&sleep_duration, &remainder) == 0 || - errno != EINTR) { - break; - } - sleep_duration = remainder; - } while (remainder.tv_sec || remainder.tv_nsec); -#endif - } - }).detach(); - } - // Tell the underlying queue the producer thread has changed, so it does not - // assert in debug. This should be called with the thread stopped. - void reset_producer_thread() - { - msg_queue.reset_thread_ids(); - } -private: -#ifndef _WIN32 - const struct timespec sleep_for = { - CUBEB_LOG_BATCH_PRINT_INTERVAL_MS/1000, - (CUBEB_LOG_BATCH_PRINT_INTERVAL_MS%1000)*1000*1000 - }; -#endif - cubeb_async_logger() - : msg_queue(CUBEB_LOG_MESSAGE_QUEUE_DEPTH) - { - run(); - } - /** This is quite a big data structure, but is only instantiated if the - * asynchronous logger is used.*/ - lock_free_queue<cubeb_log_message> msg_queue; -}; - - -void cubeb_async_log(char const * fmt, ...) -{ - if (!g_cubeb_log_callback) { - return; - } - // This is going to copy a 256 bytes array around, which is fine. - // We don't want to allocate memory here, because this is made to - // be called from a real-time callback. - va_list args; - va_start(args, fmt); - char msg[CUBEB_LOG_MESSAGE_MAX_SIZE]; - vsnprintf(msg, CUBEB_LOG_MESSAGE_MAX_SIZE, fmt, args); - cubeb_async_logger::get().push(msg); - va_end(args); -} - -void cubeb_async_log_reset_threads() -{ - if (!g_cubeb_log_callback) { - return; - } - cubeb_async_logger::get().reset_producer_thread(); -} |