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35361595f3
Remove runtime's lockDir as it is no longer needed after the lock rework. Add a trivial in-memory lock manager for unit testing Signed-off-by: Matthew Heon <matthew.heon@gmail.com>
95 lines
2.0 KiB
Go
95 lines
2.0 KiB
Go
// +build linux
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package lock
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import (
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"github.com/containers/libpod/libpod/lock/shm"
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)
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// SHMLockManager manages shared memory locks.
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type SHMLockManager struct {
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locks *shm.SHMLocks
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}
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// NewSHMLockManager makes a new SHMLockManager with the given number of locks.
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// Due to the underlying implementation, the exact number of locks created may
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// be greater than the number given here.
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func NewSHMLockManager(path string, numLocks uint32) (Manager, error) {
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locks, err := shm.CreateSHMLock(path, numLocks)
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if err != nil {
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return nil, err
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}
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manager := new(SHMLockManager)
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manager.locks = locks
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return manager, nil
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}
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// OpenSHMLockManager opens an existing SHMLockManager with the given number of
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// locks.
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func OpenSHMLockManager(path string, numLocks uint32) (Manager, error) {
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locks, err := shm.OpenSHMLock(path, numLocks)
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if err != nil {
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return nil, err
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}
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manager := new(SHMLockManager)
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manager.locks = locks
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return manager, nil
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}
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// AllocateLock allocates a new lock from the manager.
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func (m *SHMLockManager) AllocateLock() (Locker, error) {
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semIndex, err := m.locks.AllocateSemaphore()
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if err != nil {
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return nil, err
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}
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lock := new(SHMLock)
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lock.lockID = semIndex
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lock.manager = m
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return lock, nil
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}
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// RetrieveLock retrieves a lock from the manager given its ID.
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func (m *SHMLockManager) RetrieveLock(id uint32) (Locker, error) {
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lock := new(SHMLock)
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lock.lockID = id
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lock.manager = m
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return lock, nil
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}
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// SHMLock is an individual shared memory lock.
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type SHMLock struct {
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lockID uint32
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manager *SHMLockManager
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}
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// ID returns the ID of the lock.
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func (l *SHMLock) ID() uint32 {
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return l.lockID
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}
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// Lock acquires the lock.
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func (l *SHMLock) Lock() {
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if err := l.manager.locks.LockSemaphore(l.lockID); err != nil {
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panic(err.Error())
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}
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}
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// Unlock releases the lock.
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func (l *SHMLock) Unlock() {
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if err := l.manager.locks.UnlockSemaphore(l.lockID); err != nil {
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panic(err.Error())
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}
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}
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// Free releases the lock, allowing it to be reused.
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func (l *SHMLock) Free() error {
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return l.manager.locks.DeallocateSemaphore(l.lockID)
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}
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