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kube play: sdnotify proxy: use a wait group

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Use a wait group to a) wait for all proxies in parallel
                    b) avoid the potential for ABBA deadlocks

[NO NEW TESTS NEEDED] as it is not changing functionality

Signed-off-by: Valentin Rothberg <vrothberg@redhat.com>
This commit is contained in:
Valentin Rothberg
2022-09-15 14:15:15 +02:00
parent 740223c441
commit 1071098ee2
1 changed files with 19 additions and 3 deletions
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22
pkg/domain/infra/abi/play.go
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@ -11,6 +11,7 @@ import (
"path/filepath"
"strconv"
"strings"
"sync"
buildahDefine "github.com/containers/buildah/define"
"github.com/containers/common/libimage"
@ -699,9 +700,24 @@ func (ic *ContainerEngine) playKubePod(ctx context.Context, podName string, podY
fmt.Println(playKubePod.ContainerErrors)
}
// Wait for each proxy to receive a READY message.
for _, proxy := range sdNotifyProxies {
if err := proxy.WaitAndClose(); err != nil {
// Wait for each proxy to receive a READY message. Use a wait
// group to prevent the potential for ABBA kinds of deadlocks.
var wg sync.WaitGroup
errors := make([]error, len(sdNotifyProxies))
for i := range sdNotifyProxies {
wg.Add(1)
go func(i int) {
err := sdNotifyProxies[i].WaitAndClose()
if err != nil {
err = fmt.Errorf("waiting for sd-notify proxy: %w", err)
}
errors[i] = err
wg.Done()
}(i)
}
wg.Wait()
for _, err := range errors {
if err != nil {
return nil, err
}
}