vole

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Code

392 commit(s) on main

history blame raw 796 B

1	//go:build !unix
2
3	package git
4
5	import (
6	"os"
7	"sync"
8	)
9
10	// flock is not part of the portable API, so a platform without it serializes
11	// writers inside one process only. That still removes the retry storm between
12	// requests handled by one server; a second process on the same repository falls
13	// back to the compare-and-swap, which is correct and slower. Vole ships packages
14	// for the platforms where the kernel lock is available; this keeps the rest
15	// building and says what it does.
16	var (
17	processLocksMu sync.Mutex
18	processLocks = map[string]*sync.Mutex{}
19	)
20
21	func lockFile(f *os.File) (func(), error) {
22	processLocksMu.Lock()
23	mu := processLocks[f.Name()]
24	if mu == nil {
25	mu = &sync.Mutex{}
26	processLocks[f.Name()] = mu
27	}
28	processLocksMu.Unlock()
29	mu.Lock()
30	return mu.Unlock, nil
31	}
32