deadline_after - Convert a time relative to now to an absolute deadline
#include <zircon/syscalls.h>
zx_time_t zx_deadline_after(zx_duration_t nanoseconds);
zx_deadline_after() is a utility for converting from now-relative durations
to absolute deadlines. If nanoseconds plus the current time is bigger than the
maximum value for zx_time_t, the output is clamped to ZX_TIME_INFINITE.
TODO(ZX-2399)
zx_deadline_after() returns the absolute time (with respect to ZX_CLOCK_MONOTONIC)
that is nanoseconds nanoseconds from now.
zx_deadline_after() does not report any error conditions.
// Sleep 50 milliseconds
zx_time_t deadline = zx_deadline_after(ZX_MSEC(50));
zx_nanosleep(deadline);