mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-11-26 21:56:39 +00:00
1e7b32490d
This allows for building GoToSocial with [SQLite transpiled to WASM](https://github.com/ncruces/go-sqlite3) and accessed through [Wazero](https://wazero.io/).
77 lines
2.3 KiB
Go
77 lines
2.3 KiB
Go
package platform
|
|
|
|
import (
|
|
"sync/atomic"
|
|
"time"
|
|
|
|
"github.com/tetratelabs/wazero/sys"
|
|
)
|
|
|
|
const (
|
|
ms = int64(time.Millisecond)
|
|
// FakeEpochNanos is midnight UTC 2022-01-01 and exposed for testing
|
|
FakeEpochNanos = 1640995200000 * ms
|
|
)
|
|
|
|
// NewFakeWalltime implements sys.Walltime with FakeEpochNanos that increases by 1ms each reading.
|
|
// See /RATIONALE.md
|
|
func NewFakeWalltime() sys.Walltime {
|
|
// AddInt64 returns the new value. Adjust so the first reading will be FakeEpochNanos
|
|
t := FakeEpochNanos - ms
|
|
return func() (sec int64, nsec int32) {
|
|
wt := atomic.AddInt64(&t, ms)
|
|
return wt / 1e9, int32(wt % 1e9)
|
|
}
|
|
}
|
|
|
|
// NewFakeNanotime implements sys.Nanotime that increases by 1ms each reading.
|
|
// See /RATIONALE.md
|
|
func NewFakeNanotime() sys.Nanotime {
|
|
// AddInt64 returns the new value. Adjust so the first reading will be zero.
|
|
t := int64(0) - ms
|
|
return func() int64 {
|
|
return atomic.AddInt64(&t, ms)
|
|
}
|
|
}
|
|
|
|
// FakeNanosleep implements sys.Nanosleep by returning without sleeping.
|
|
var FakeNanosleep = sys.Nanosleep(func(int64) {})
|
|
|
|
// FakeOsyield implements sys.Osyield by returning without yielding.
|
|
var FakeOsyield = sys.Osyield(func() {})
|
|
|
|
// Walltime implements sys.Walltime with time.Now.
|
|
//
|
|
// Note: This is only notably less efficient than it could be is reading
|
|
// runtime.walltime(). time.Now defensively reads nanotime also, just in case
|
|
// time.Since is used. This doubles the performance impact. However, wall time
|
|
// is likely to be read less frequently than Nanotime. Also, doubling the cost
|
|
// matters less on fast platforms that can return both in <=100ns.
|
|
func Walltime() (sec int64, nsec int32) {
|
|
t := time.Now()
|
|
return t.Unix(), int32(t.Nanosecond())
|
|
}
|
|
|
|
// nanoBase uses time.Now to ensure a monotonic clock reading on all platforms
|
|
// via time.Since.
|
|
var nanoBase = time.Now()
|
|
|
|
// nanotimePortable implements sys.Nanotime with time.Since.
|
|
//
|
|
// Note: This is less efficient than it could be is reading runtime.nanotime(),
|
|
// Just to do that requires CGO.
|
|
func nanotimePortable() int64 {
|
|
return time.Since(nanoBase).Nanoseconds()
|
|
}
|
|
|
|
// Nanotime implements sys.Nanotime with runtime.nanotime() if CGO is available
|
|
// and time.Since if not.
|
|
func Nanotime() int64 {
|
|
return nanotime()
|
|
}
|
|
|
|
// Nanosleep implements sys.Nanosleep with time.Sleep.
|
|
func Nanosleep(ns int64) {
|
|
time.Sleep(time.Duration(ns))
|
|
}
|