"unsafe"
)
+// finblock is an array of finalizers to be executed. finblocks are
+// arranged in a linked list for the finalizer queue.
+//
// finblock is allocated from non-GC'd memory, so any heap pointers
-// must be specially handled.
+// must be specially handled. GC currently assumes that the finalizer
+// queue does not grow during marking (but it can shrink).
//
//go:notinheap
type finblock struct {
}
func queuefinalizer(p unsafe.Pointer, fn *funcval, nret uintptr, fint *_type, ot *ptrtype) {
+ if gcphase != _GCoff {
+ // Currently we assume that the finalizer queue won't
+ // grow during marking so we don't have to rescan it
+ // during mark termination. If we ever need to lift
+ // this assumption, we can do it by adding the
+ // necessary barriers to queuefinalizer (which it may
+ // have automatically).
+ throw("queuefinalizer during GC")
+ }
+
lock(&finlock)
if finq == nil || finq.cnt == uint32(len(finq.fin)) {
if finc == nil {
}
case i == fixedRootFinalizers:
+ // Only do this once per GC cycle since we don't call
+ // queuefinalizer during marking.
+ if work.markrootDone {
+ break
+ }
for fb := allfin; fb != nil; fb = fb.alllink {
cnt := uintptr(atomic.Load(&fb.cnt))
scanblock(uintptr(unsafe.Pointer(&fb.fin[0])), cnt*unsafe.Sizeof(fb.fin[0]), &finptrmask[0], gcw)