vole

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Code

392 commit(s) on main

history blame raw 915 B

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	}
38