Defined in header <csignal>
typedef /* unspecified */ sig_atomic_t;

An integer type which can be accessed as an atomic entity even in the presence of asynchronous interrupts made by signals.


Until C++11, which introduced std::atomic and std::atomic_signal_fence, about the only thing a strictly conforming program could do in a signal handler was to assign a value to a volatile static std::sig_atomic_t variable and promptly return.

See also

sets a signal handler for particular signal
fence between a thread and a signal handler executed in the same thread
C documentation for sig_atomic_t

© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.