vole

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Blame · ci/cache/lock_other.go

Line attribution on main · 46 line(s)

a29ce1f7 Keenan Nemetz 2d ago	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	}