Add initial version of renumber backend

Renumber is a way of renumbering container locks after the number
of locks available has changed.

For now, renumber only works with containers.

Signed-off-by: Matthew Heon <matthew.heon@pm.me>

1 files changed, 5 insertions, 0 deletions

diff --git a/libpod/lock/shm_lock_manager_linux.go b/libpod/lock/shm_lock_manager_linux.go
index 94dfd7dd7..187661c8b 100644
--- a/libpod/lock/shm_lock_manager_linux.go
+++ b/libpod/lock/shm_lock_manager_linux.go
@@ -71,6 +71,11 @@ func (m *SHMLockManager) RetrieveLock(id uint32) (Locker, error) {
 	return lock, nil
 }
 
+// FreeAllLocks frees all locks in the manager
+func (m *SHMLockManager) FreeAllLocks() error {
+	return m.locks.DeallocateAllSemaphores()
+}
+
 // SHMLock is an individual shared memory lock.
 type SHMLock struct {
 	lockID  uint32