1.1. Thread Safety

Non thread safe functions

The following functions should not be called concurrently from multiple threads on the same logger object:

• set_error_handler(log_err_handler);
• 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)