3d72f2cb90
This implements WASI `sched_yield` with `sys.Osyield` that defaults to return immediately. This is intentionally left without a built-in alternative as common platforms such as darwin implement `runtime.osyield` by sleeping for a microsecond. If we implemented that, user code would be slowed down without a clear reason why. Signed-off-by: Adrian Cole <adrian@tetrate.io>
26 lines
1.0 KiB
Go
26 lines
1.0 KiB
Go
package sys
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// ClockResolution is a positive granularity of clock precision in
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// nanoseconds. For example, if the resolution is 1us, this returns 1000.
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//
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// Note: Some implementations return arbitrary resolution because there's
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// no perfect alternative. For example, according to the source in time.go,
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// windows monotonic resolution can be 15ms. See /RATIONALE.md.
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type ClockResolution uint32
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// Walltime returns the current time in epoch seconds with a nanosecond fraction.
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type Walltime func() (sec int64, nsec int32)
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// Nanotime returns nanoseconds since an arbitrary start point, used to measure
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// elapsed time. This is sometimes referred to as a tick or monotonic time.
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//
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// Note: There are no constraints on the value return except that it
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// increments. For example, -1 is a valid if the next value is >= 0.
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type Nanotime func() int64
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// Nanosleep puts the current goroutine to sleep for at least ns nanoseconds.
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type Nanosleep func(ns int64)
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// Osyield yields the processor, typically to implement spin-wait loops.
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type Osyield func()
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