nng_duration − relative time in milliseconds
#include <nng/nng.h>
typedef int32_t nng_duration;
#define
NNG_DURATION_INFINITE (−1)
#define NNG_DURATION_DEFAULT (−2)
#define NNG_DURATION_ZERO (0)
An nng_duration is a relative time, measured in milliseconds. This type is most often used in conjunction with timers and timeouts.
A couple of special values have been set aside, and carry special meanings.
NNG_DURATION_DEFAULT
Indicates a context−specific default value should be used.
NNG_DURATION_INFINITE
Effectively an infinite duration; used most often to disable timeouts.
NNG_DURATION_ZERO
Zero length duration; used to perform a single polling operation.
nng_options(5), nng(7)