1.1. Thread Safety

Non thread safe functions

The following functions should not be called concurrently from multiple threads on the same logger object, or while the logger is used in another thread at the same time:

• set_error_handler(log_err_handler);
• enable_backtrace(size_t);
• disable_backtrace();
• logger::sinks() - returns a reference to a non thread safe vector, so don't modify it concurrently (e.g. logger->sinks().push_back(new_sink);)

Note: This restriction applies to all kind of loggers ("_mt" or "_st").

Loggers

To create thread safe loggers, use the _mt factory functions.

For example:

auto logger = spdlog::basic_logger_mt(...);

To create single threaded loggers, use the _st factory functions.

For example:

auto logger = spdlog::basic_logger_st(...);

Sinks

• Thread safe sinks: sinks ending with _mt (e.g daily_file_sink_mt)
• Non thread safe sinks: sinks ending with _st (e.g daily_file_sink_st)