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a29ce1f7
Keenan Nemetz
2d ago
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1 | //go:build unix |
| 2 | ||
| 3 | package cache | |
| 4 | ||
| 5 | import ( | |
| 6 | "os" | |
| 7 | "syscall" | |
| 8 | ) | |
| 9 | ||
| 10 | // lockFile takes the lock f names. A shared lock is what a job holds while it has | |
| 11 | // the namespace mounted; exclusive is what eviction takes. wait=false asks rather | |
| 12 | // than waits: the caller has other namespaces it can try. | |
| 13 | // | |
| 14 | // A signal can interrupt the wait and the lock is not held when it does, so the | |
| 15 | // call asks again rather than reporting a failure the caller cannot act on. | |
| 16 | func lockFile(f *os.File, exclusive, wait bool) (func(), bool, error) { | |
| 17 | how := syscall.LOCK_SH | |
| 18 | if exclusive { | |
| 19 | how = syscall.LOCK_EX | |
| 20 | } | |
| 21 | if !wait { | |
| 22 | how |= syscall.LOCK_NB | |
| 23 | } | |
| 24 | for { | |
| 25 | err := syscall.Flock(int(f.Fd()), how) | |
| 26 | switch err { | |
| 27 | case nil: | |
| 28 | return func() { _ = syscall.Flock(int(f.Fd()), syscall.LOCK_UN) }, true, nil | |
| 29 | case syscall.EINTR: | |
| 30 | continue | |
| 31 | case syscall.EWOULDBLOCK: | |
| 32 | return nil, false, nil | |
| 33 | default: | |
| 34 | return nil, false, err | |
| 35 | } | |
| 36 | } | |
| 37 | } |