From 01e387acb0cc345fc9992498898efd167bf07b71 Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Sun, 23 May 2021 02:51:32 +0300 Subject: libcamera: log: Destroy LogCategory instances in a controlled way The LogCategory instances are constructed on first use as static variables in accessor functions, following the Meyers singleton pattern. As a result, their destruction order is not guaranteed. This can cause issues as the global Logger object, constructed in a similar fashion, is accessed from the LogCategory destructor and may be destroyed first. To fix this, keep the same singleton pattern, but allocate the LogCategory instances dynamically. As they get registered with the global Logger instance, we can destroy them in the Logger destructor. This only avoids destruction order issues between LogCategory and Logger, and doesn't address yet the fact that LOG() calls from destructors of global objects may access an already destroyed Logger. Signed-off-by: Laurent Pinchart Reviewed-by: Hirokazu Honda Reviewed-by: Kieran Bingham --- src/libcamera/log.cpp | 32 +++++++++++--------------------- 1 file changed, 11 insertions(+), 21 deletions(-) (limited to 'src') diff --git a/src/libcamera/log.cpp b/src/libcamera/log.cpp index dd991647..74829a56 100644 --- a/src/libcamera/log.cpp +++ b/src/libcamera/log.cpp @@ -248,6 +248,8 @@ void LogOutput::writeStream(const std::string &str) class Logger { public: + ~Logger(); + static Logger *instance(); void write(const LogMessage &msg); @@ -267,7 +269,6 @@ private: friend LogCategory; void registerCategory(LogCategory *category); - void unregisterCategory(LogCategory *category); std::unordered_set categories_; std::list> levels_; @@ -369,6 +370,12 @@ void logSetLevel(const char *category, const char *level) Logger::instance()->logSetLevel(category, level); } +Logger::~Logger() +{ + for (LogCategory *category : categories_) + delete category; +} + /** * \brief Retrieve the logger instance * @@ -665,18 +672,6 @@ void Logger::registerCategory(LogCategory *category) } } -/** - * \brief Unregister a log category from the logger - * \param[in] category The log category - * - * If the \a category hasn't been registered with the logger this function - * performs no operation. - */ -void Logger::unregisterCategory(LogCategory *category) -{ - categories_.erase(category); -} - /** * \enum LogSeverity * Log message severity @@ -711,11 +706,6 @@ LogCategory::LogCategory(const char *name) Logger::instance()->registerCategory(this); } -LogCategory::~LogCategory() -{ - Logger::instance()->unregisterCategory(this); -} - /** * \fn LogCategory::name() * \brief Retrieve the log category name @@ -746,12 +736,12 @@ void LogCategory::setSeverity(LogSeverity severity) * The default log category is named "default" and is used by the LOG() macro * when no log category is specified. * - * \return A pointer to the default log category + * \return A reference to the default log category */ const LogCategory &LogCategory::defaultCategory() { - static const LogCategory category("default"); - return category; + static const LogCategory *category = new LogCategory("default"); + return *category; } /** -- cgit v1.2.1