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zfscmd: do not do duplicate waitPre callbacks

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it just makes sense that if we only dispatch one waitPost, we should
also only dispatch one waitPre
This commit is contained in:
Christian Schwarz 2020-04-21 11:57:56 +02:00
parent f61295f76c
commit 0834a184b8
1 changed files with 22 additions and 5 deletions
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27
zfs/zfscmd/zfscmd.go
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@ -18,10 +18,10 @@ import (
)
type Cmd struct {
cmd *exec.Cmd
ctx context.Context
mtx sync.RWMutex
startedAt, waitReturnedAt time.Time
cmd *exec.Cmd
ctx context.Context
mtx sync.RWMutex
startedAt, waitStartedAt, waitReturnedAt time.Time
}
func CommandContext(ctx context.Context, name string, arg ...string) *Cmd {
@ -119,13 +119,30 @@ func (c *Cmd) startPost(err error) {
}
func (c *Cmd) waitPre() {
waitPreLogging(c, time.Now())
now := time.Now()
// ignore duplicate waits
c.mtx.Lock()
// ignore duplicate waits
if !c.waitStartedAt.IsZero() {
c.mtx.Unlock()
return
}
c.waitStartedAt = now
c.mtx.Unlock()
waitPreLogging(c, now)
}
func (c *Cmd) waitPost(err error) {
now := time.Now()
c.mtx.Lock()
// ignore duplicate waits
if !c.waitReturnedAt.IsZero() {
c.mtx.Unlock()
return
}
c.waitReturnedAt = now
c.mtx.Unlock()