1 files changed, 38 insertions, 0 deletions
diff --git a/pkg/sentry/time/seqatomic_parameters_unsafe.go b/pkg/sentry/time/seqatomic_parameters_unsafe.go
new file mode 100644
index 000000000..357e476ec
--- /dev/null
+++ b/pkg/sentry/time/seqatomic_parameters_unsafe.go
@@ -0,0 +1,38 @@
+package time
+
+import (
+	"unsafe"
+
+	"gvisor.dev/gvisor/pkg/gohacks"
+	"gvisor.dev/gvisor/pkg/sync"
+)
+
+// SeqAtomicLoad returns a copy of *ptr, ensuring that the read does not race
+// with any writer critical sections in seq.
+//
+//go:nosplit
+func SeqAtomicLoadParameters(seq *sync.SeqCount, ptr *Parameters) Parameters {
+	for {
+		if val, ok := SeqAtomicTryLoadParameters(seq, seq.BeginRead(), ptr); ok {
+			return val
+		}
+	}
+}
+
+// SeqAtomicTryLoad returns a copy of *ptr while in a reader critical section
+// in seq initiated by a call to seq.BeginRead() that returned epoch. If the
+// read would race with a writer critical section, SeqAtomicTryLoad returns
+// (unspecified, false).
+//
+//go:nosplit
+func SeqAtomicTryLoadParameters(seq *sync.SeqCount, epoch sync.SeqCountEpoch, ptr *Parameters) (val Parameters, ok bool) {
+	if sync.RaceEnabled {
+
+		gohacks.Memmove(unsafe.Pointer(&val), unsafe.Pointer(ptr), unsafe.Sizeof(val))
+	} else {
+
+		val = *ptr
+	}
+	ok = seq.ReadOk(epoch)
+	return
+}