[tor-bugs] #21312 [Obfuscation/Snowflake]: snowflake-client is pegged at 100% cpu

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#21312: snowflake-client is pegged at 100% cpu
-----------------------------------+------------------------------
 Reporter:  arlolra                |          Owner:  arlolra
     Type:  defect                 |         Status:  needs_review
 Priority:  High                   |      Milestone:
Component:  Obfuscation/Snowflake  |        Version:
 Severity:  Major                  |     Resolution:
 Keywords:                         |  Actual Points:
Parent ID:                         |         Points:
 Reviewer:                         |        Sponsor:
-----------------------------------+------------------------------

Comment (by yawning):

 There is also `sync.Once`.

 {{{
 type Foo struct {
    destroyOnce sync.Once
 }

 func (f *Foo) Destroy() {
   f.destroyOnce.Do(func() {
     // Things that MUST only happen once, here.
   })
 }
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21312#comment:51>
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