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7c52c4d92e
Go maintainers started to unconditionally update the minimum go version for golang.org/x/ dependencies to go1.23, which means that we'll no longer be able to support any version below that when updating those dependencies; > all: upgrade go directive to at least 1.23.0 [generated] > > By now Go 1.24.0 has been released, and Go 1.22 is no longer supported > per the Go Release Policy (https://go.dev/doc/devel/release#policy). > > For golang/go#69095. This updates our minimum version to go1.23, as we won't be able to maintain compatibility with older versions because of the above. Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
59 lines
1.4 KiB
Go
59 lines
1.4 KiB
Go
// TODO(thaJeztah): remove once we are a module; the go:build directive prevents go from downgrading language version to go1.16:
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//go:build go1.23
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package platform
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import (
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"os"
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"strconv"
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"strings"
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"sync"
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)
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// possibleCPUs returns the set of possible CPUs on the host (which is
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// equal or larger to the number of CPUs currently online). The returned
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// set may be a single number ({0}), or a continuous range ({0,1,2,3}), or
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// a non-continuous range ({0,1,2,3,12,13,14,15})
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//
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// Returns nil on errors. Assume CPUs are 0 -> runtime.NumCPU() in that case.
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var possibleCPUs = sync.OnceValue(func() []int {
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data, err := os.ReadFile("/sys/devices/system/cpu/possible")
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if err != nil {
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return nil
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}
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content := strings.TrimSpace(string(data))
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return parsePossibleCPUs(content)
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})
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func parsePossibleCPUs(content string) []int {
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ranges := strings.Split(content, ",")
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var cpus []int
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for _, r := range ranges {
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// Each entry is either a single number (e.g., "0") or a continuous range
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// (e.g., "0-3").
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if rStart, rEnd, ok := strings.Cut(r, "-"); !ok {
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cpu, err := strconv.Atoi(rStart)
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if err != nil {
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return nil
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}
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cpus = append(cpus, cpu)
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} else {
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var start, end int
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start, err := strconv.Atoi(rStart)
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if err != nil {
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return nil
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}
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end, err = strconv.Atoi(rEnd)
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if err != nil {
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return nil
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}
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for i := start; i <= end; i++ {
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cpus = append(cpus, i)
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}
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}
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}
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return cpus
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}
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