Struct SystemClock 

pub struct SystemClock;

Default implementation backed by std::time::SystemTime.

The conversion to u64 milliseconds saturates at both ends rather than wrapping or panicking, so a misconfigured clock surfaces visibly instead of silently stalling window advance:

• A time so far in the future that the millisecond count exceeds u64::MAX saturates to u64::MAX. A bare as u64 cast would wrap to a small value, making a far-future clock masquerade as the distant past and stall the allocator — the opposite of the truth. u64::MAX instead drives the allocator straight into visible window exhaustion.
• A pre-Unix-epoch time saturates to 0 (the earliest representable instant). Per the module docs, a clock pinned in the past stalls new windows until wall time catches up past the persisted high-water; 0 is the faithful representation of such a clock, not a swallowed error.

Trait Implementations

impl Clock for SystemClock

fn now_ms(&self) -> u64

Milliseconds since Unix epoch.