PKGBUILD/vendor/periph.io/x/periph/periph_serial.go

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2018-12-04 18:11:50 +00:00
// Copyright 2018 The Periph Authors. All rights reserved.
// Use of this source code is governed under the Apache License, Version 2.0
// that can be found in the LICENSE file.
// This file contains the single threaded driver loading code, to be used on
// low performance cores.
// +build tinygo
package periph
import (
"errors"
"strconv"
)
func initImpl() (*State, error) {
state = &State{}
// At this point, byName is guaranteed to be immutable.
stages, err := explodeStages()
if err != nil {
return state, err
}
loaded := make(map[string]struct{}, len(byName))
for _, s := range stages {
s.loadSerial(state, loaded)
}
return state, nil
}
// loadSerial loads all the drivers for this stage, one after the other.
func (s *stage) loadSerial(state *State, loaded map[string]struct{}) {
for name, drv := range s.drvs {
// Intentionally do not look at After(), only Prerequisites().
for _, dep := range drv.Prerequisites() {
if _, ok := loaded[dep]; !ok {
state.Skipped = insertDriverFailure(state.Skipped, DriverFailure{drv, errors.New("dependency not loaded: " + strconv.Quote(dep))})
goto loop
}
}
// Not skipped driver, attempt loading in a goroutine.
if ok, err := drv.Init(); ok {
if err == nil {
state.Loaded = insertDriver(state.Loaded, drv)
loaded[name] = struct{}{}
} else {
state.Failed = insertDriverFailure(state.Failed, DriverFailure{drv, err})
}
} else {
state.Skipped = insertDriverFailure(state.Skipped, DriverFailure{drv, err})
}
loop:
}
}