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https://github.com/fumiama/orbyte.git
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60 lines
1.1 KiB
Go
60 lines
1.1 KiB
Go
package orbyte
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import "sync/atomic"
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const (
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statusisbuffered = 1 << iota
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statusdestroyed
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)
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type status uintptr
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var destroyedstatus status
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func init() {
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destroyedstatus.setdestroyed(true)
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}
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func (c status) mask(v bool, typ uintptr) (news status) {
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news = c
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if v {
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news |= status(typ)
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} else {
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news &= ^status(typ)
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}
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return
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}
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func (c *status) setbool(v bool, typ uintptr) {
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olds := atomic.LoadUintptr((*uintptr)(c))
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oldv := olds&typ != 0
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if oldv == v {
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return
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}
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news := status(olds).mask(v, typ)
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for !atomic.CompareAndSwapUintptr((*uintptr)(c), olds, uintptr(news)) {
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olds = atomic.LoadUintptr((*uintptr)(c))
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news = status(olds).mask(v, typ)
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}
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}
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func (c *status) loadbool(typ uintptr) bool {
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return atomic.LoadUintptr((*uintptr)(c))&typ != 0
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}
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func (c *status) isbuffered() bool {
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return c.loadbool(statusisbuffered)
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}
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func (c *status) setbuffered(v bool) {
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c.setbool(v, statusisbuffered)
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}
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func (c *status) hasdestroyed() bool {
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return c.loadbool(statusdestroyed)
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}
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func (c *status) setdestroyed(v bool) {
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c.setbool(v, statusdestroyed)
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}
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