1 files changed, 27 insertions, 0 deletions
diff --git a/pkg/sentry/kernel/futex/atomicptr_bucket.go b/pkg/sentry/kernel/futex/atomicptr_bucket.go
new file mode 100755
index 000000000..2251a6e72
--- /dev/null
+++ b/pkg/sentry/kernel/futex/atomicptr_bucket.go
@@ -0,0 +1,27 @@
+package futex
+
+import (
+	"sync/atomic"
+	"unsafe"
+)
+
+// An AtomicPtr is a pointer to a value of type Value that can be atomically
+// loaded and stored. The zero value of an AtomicPtr represents nil.
+//
+// Note that copying AtomicPtr by value performs a non-atomic read of the
+// stored pointer, which is unsafe if Store() can be called concurrently; in
+// this case, do `dst.Store(src.Load())` instead.
+type AtomicPtrBucket struct {
+	ptr unsafe.Pointer
+}
+
+// Load returns the value set by the most recent Store. It returns nil if there
+// has been no previous call to Store.
+func (p *AtomicPtrBucket) Load() *bucket {
+	return (*bucket)(atomic.LoadPointer(&p.ptr))
+}
+
+// Store sets the value returned by Load to x.
+func (p *AtomicPtrBucket) Store(x *bucket) {
+	atomic.StorePointer(&p.ptr, (unsafe.Pointer)(x))
+}