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Diffstat (limited to 'pkg/sync/seqatomic_unsafe.go')
-rw-r--r--pkg/sync/seqatomic_unsafe.go66
1 files changed, 0 insertions, 66 deletions
diff --git a/pkg/sync/seqatomic_unsafe.go b/pkg/sync/seqatomic_unsafe.go
deleted file mode 100644
index 2184cb5ab..000000000
--- a/pkg/sync/seqatomic_unsafe.go
+++ /dev/null
@@ -1,66 +0,0 @@
-// Copyright 2019 The gVisor Authors.
-//
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Package template doesn't exist. This file must be instantiated using the
-// go_template_instance rule in tools/go_generics/defs.bzl.
-package template
-
-import (
- "fmt"
- "reflect"
- "strings"
- "unsafe"
-
- "gvisor.dev/gvisor/pkg/sync"
-)
-
-// Value is a required type parameter.
-//
-// Value must not contain any pointers, including interface objects, function
-// objects, slices, maps, channels, unsafe.Pointer, and arrays or structs
-// containing any of the above. An init() function will panic if this property
-// does not hold.
-type Value struct{}
-
-// SeqAtomicLoad returns a copy of *ptr, ensuring that the read does not race
-// with any writer critical sections in seq.
-//
-//go:nosplit
-func SeqAtomicLoad(seq *sync.SeqCount, ptr *Value) Value {
- for {
- if val, ok := SeqAtomicTryLoad(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 SeqAtomicTryLoad(seq *sync.SeqCount, epoch sync.SeqCountEpoch, ptr *Value) (val Value, ok bool) {
- if sync.RaceEnabled {
- // runtime.RaceDisable() doesn't actually stop the race detector, so it
- // can't help us here. Instead, call runtime.memmove directly, which is
- // not instrumented by the race detector.
- sync.Memmove(unsafe.Pointer(&val), unsafe.Pointer(ptr), unsafe.Sizeof(val))
- } else {
- // This is ~40% faster for short reads than going through memmove.
- val = *ptr
- }
- ok = seq.ReadOk(epoch)
- return
-}
-
-func init() {
- var val Value
- typ := reflect.TypeOf(val)
- name := typ.Name()
- if ptrs := sync.PointersInType(typ, name); len(ptrs) != 0 {
- panic(fmt.Sprintf("SeqAtomicLoad<%s> is invalid since values %s of type %s contain pointers:\n%s", typ, name, typ, strings.Join(ptrs, "\n")))
- }
-}