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Clarify POSIX async‑signal safety #1649

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Clarify POSIX async‑signal safety #1649

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7 changes: 7 additions & 0 deletions asio/include/asio/basic_signal_set.hpp
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Expand Up @@ -92,6 +92,13 @@ namespace asio {
* and @c pthread_sigmask(). For signals to be delivered, programs must ensure
* that any signals registered using signal_set objects are unblocked in at
* least one thread.
*
* @par POSIX async‑signal safety
*
* Signal handlers installed by this class are executed in the context of
* the thread executing asio service, not the thread handling the interrupt.
* Therefore signal handlers handled by this class are
* automatically async‑signal safe.
*/
template <typename Executor = any_io_executor>
class basic_signal_set : public signal_set_base
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