# std::sig_atomic_t

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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.

### Notes

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

signal | sets a signal handler for particular signal (function)
C documentation for sig_atomic_t
atomic_signal_fence (C++11) | fence between a thread and a signal handler executed in the same thread (function)

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