vole

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Code

392 commit(s) on main

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1	//go:build !unix
2
3	package cache
4
5	import (
6	"os"
7	"sync"
8	)
9
10	// flock is not part of the portable API, so a platform without it serialises
11	// holders inside one process only. Vole ships runner packages for the platforms
12	// where the kernel lock exists; this keeps the rest building, and says what it
13	// does: a job and the trimmer in one process are excluded from each other, and a
14	// second process on the same --dir is not.
15	var (
16	processLockMu sync.Mutex
17	processLocks = map[string]*sync.RWMutex{}
18	)
19
20	func lockFile(f *os.File, exclusive, wait bool) (func(), bool, error) {
21	processLockMu.Lock()
22	mu := processLocks[f.Name()]
23	if mu == nil {
24	mu = &sync.RWMutex{}
25	processLocks[f.Name()] = mu
26	}
27	processLockMu.Unlock()
28	switch {
29	case exclusive && !wait:
30	if !mu.TryLock() {
31	return nil, false, nil
32	}
33	return mu.Unlock, true, nil
34	case exclusive:
35	mu.Lock()
36	return mu.Unlock, true, nil
37	case !wait:
38	if !mu.TryRLock() {
39	return nil, false, nil
40	}
41	return mu.RUnlock, true, nil
42	default:
43	mu.RLock()
44	return mu.RUnlock, true, nil
45	}
46	}
47