A Cache is a GC-friendly concurrent map from unsafe.Pointer to unsafe.Pointer. It is meant to be used for maintaining shadow BoringCrypto state associated with certain allocated structs, in particular public and private RSA and ECDSA keys.
The cache is GC-friendly in the sense that the keys do not indefinitely prevent the garbage collector from collecting them. Instead, at the start of each GC, the cache is cleared entirely. That is, the cache is lossy, and the loss happens at the start of each GC. This means that clients need to be able to cope with cache entries disappearing, but it also means that clients don't need to worry about cache entries keeping the keys from being collected.
type Cache[K, V any] struct { // contains filtered or unexported fields }
func (c *Cache[K, V]) Clear()
Clear clears the cache. The runtime does this automatically at each garbage collection; this method is exposed only for testing.
func (c *Cache[K, V]) Get(k *K) *V
Get returns the cached value associated with v, which is either the value v corresponding to the most recent call to Put(k, v) or nil if that cache entry has been dropped.
func (c *Cache[K, V]) Put(k *K, v *V)
Put sets the cached value associated with k to v.
func (c *Cache[K, V]) Register()
Register registers the cache with the runtime, so that c.ptable can be cleared at the start of each GC. Register must be called during package initialization.