timer: proper way to check POSIX timers support #136
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The _POSIX_TIMERS macros can be used to determine the degree of a host's support for the posix timers API. The POSIX definition (2018 edition) says that: _POSIX_TIMERS The implementation supports timers. This symbol shall always be set to the value 200809L. It's defined in the <unistd.h> header. Tested on esp32, pico and teensy4. Signed-off-by: Thomas Chou <[email protected]>
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The _POSIX_TIMERS macros can be used to determine the degree of a host's support for the posix timers API.
The POSIX definition (2018 edition) says that:
_POSIX_TIMERS
The implementation supports timers. This symbol shall always be set to the value 200809L.
It's defined in the <unistd.h> header.
Tested on esp32, pico and teensy4.