C++11 allows the use of atomics in signal handlers, and with the advent of C++ 17 the signal handler feature was again improved. The std::atomic_flag is an atomic boolean type that is guaranteed to be lock-free and can be used in signal handlers. Moreover, the <csignal> header in C++ has an integer type std::sig_atomic_t that can be accessed as an atomic entity even in the presence of asynchronous interrupts made by signals. In this post, we explain how to use atomic_flag in C++.
How to allow atomics use in C++ signal handlers?
The <csignal> header in C++ (or signal.h in C) has an an integer type std::sig_atomic_t that can be accessed as an atomic entity even in the presence of asynchronous interrupts made by signals. In this post, we explain how to allow atomics use in C++ signal handlers.
Here is how we can use it:
Is there a full example of how to use atomics in C++ signal handlers?
Here is an example that has a signal handler and uses sig_atomic_t flag from <csignal>
The output will be as follows:
For more information on this feature, see Allow atomics use in signal handlers Proposal document.
If you want to know more about signals and error handlers, I recommend you “CERT C Coding Standard, Second Edition, The: 98 Rules for Developing Safe, Reliable, and Secure Systems”.
https://www.informit.com/store/cert-c-coding-standard-second-edition-98-rules-for-9780321984043
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