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chore: implement phase 5 #2783

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chore: implement phase 5 #2783

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e438d91
chore: implement phase 5
Tofel Aug 31, 2026
6db0bbd
chore: remove unix build tags
Tofel Sep 4, 2026
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18 changes: 18 additions & 0 deletions grafana-alertcheck/internal/gate/flock.go
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Original file line number Diff line number Diff line change
@@ -0,0 +1,18 @@
package gate

import (
"fmt"
"os"
"syscall"
)

// lockExclusive takes a non-blocking exclusive lock on f. Non-blocking is the
// point (§8): a second writer must fail immediately with an error the operator
// sees, not queue behind the first and start appending to a log somebody else
// already finished.
func lockExclusive(f *os.File) error {
if err := syscall.Flock(int(f.Fd()), syscall.LOCK_EX|syscall.LOCK_NB); err != nil {
return fmt.Errorf("flock: %w", err)
}
return nil
}
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