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package librsync // import "code.laria.me/golibrsync/librsync"
import (
"sync"
)
// pointerMap holds Go *Patcher objects to pass to C.
// Don't touch this data structure, instead use the storePatcher, getPatcher,
// and dropPatcher functions.
var patcherStore = struct {
lock sync.Mutex
store map[uintptr]*Patcher
}{
store: make(map[uintptr]*Patcher),
}
// storePatcher stores the value and returns a reference to it, for use in a CGo
// call. Use the same reference for dropPatcher. C callbacks can use getPatcher
// to get the original value.
func storePatcher(patcher *Patcher, id uintptr) {
patcherStore.lock.Lock()
defer patcherStore.lock.Unlock()
if _, ok := patcherStore.store[id]; ok {
// Just to be on the safe side.
panic("pointer already stored")
}
patcherStore.store[id] = patcher
}
// getPatcher returns the value for the reference id. It returns nil if there
// is no such reference.
func getPatcher(id uintptr) *Patcher {
patcherStore.lock.Lock()
defer patcherStore.lock.Unlock()
return patcherStore.store[id]
}
// dropPatcher unreferences the value so the garbage collector can free it's
// memory.
func dropPatcher(id uintptr) {
patcherStore.lock.Lock()
defer patcherStore.lock.Unlock()
if _, ok := patcherStore.store[id]; !ok {
panic("pointer not stored")
}
delete(patcherStore.store, id)
}
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