11.1.2 Using C++ Support Libraries With Threads and Signals

The C++ support libraries, libCrun, libiostream, libCstd, and libC are multithread safe but are not async safe. This means that in a multithreaded application, functions available in the support libraries should not be used in signal handlers. Doing so can result in a deadlock situation.

It is not safe to use the following in a signal handler in a multithreaded application:

• Iostreams

• new and delete expressions

• Exceptions