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-rw-r--r--src/sync/atomic/atomic_test.go1509
1 files changed, 1509 insertions, 0 deletions
diff --git a/src/sync/atomic/atomic_test.go b/src/sync/atomic/atomic_test.go
new file mode 100644
index 000000000..9f13af48b
--- /dev/null
+++ b/src/sync/atomic/atomic_test.go
@@ -0,0 +1,1509 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package atomic_test
+
+import (
+ "fmt"
+ "runtime"
+ "strings"
+ . "sync/atomic"
+ "testing"
+ "unsafe"
+)
+
+// Tests of correct behavior, without contention.
+// (Does the function work as advertised?)
+//
+// Test that the Add functions add correctly.
+// Test that the CompareAndSwap functions actually
+// do the comparison and the swap correctly.
+//
+// The loop over power-of-two values is meant to
+// ensure that the operations apply to the full word size.
+// The struct fields x.before and x.after check that the
+// operations do not extend past the full word size.
+
+const (
+ magic32 = 0xdedbeef
+ magic64 = 0xdeddeadbeefbeef
+)
+
+// Do the 64-bit functions panic? If so, don't bother testing.
+var test64err = func() (err interface{}) {
+ defer func() {
+ err = recover()
+ }()
+ var x int64
+ AddInt64(&x, 1)
+ return nil
+}()
+
+func TestSwapInt32(t *testing.T) {
+ var x struct {
+ before int32
+ i int32
+ after int32
+ }
+ x.before = magic32
+ x.after = magic32
+ var j int32
+ for delta := int32(1); delta+delta > delta; delta += delta {
+ k := SwapInt32(&x.i, delta)
+ if x.i != delta || k != j {
+ t.Fatalf("delta=%d i=%d j=%d k=%d", delta, x.i, j, k)
+ }
+ j = delta
+ }
+ if x.before != magic32 || x.after != magic32 {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, magic32, magic32)
+ }
+}
+
+func TestSwapUint32(t *testing.T) {
+ var x struct {
+ before uint32
+ i uint32
+ after uint32
+ }
+ x.before = magic32
+ x.after = magic32
+ var j uint32
+ for delta := uint32(1); delta+delta > delta; delta += delta {
+ k := SwapUint32(&x.i, delta)
+ if x.i != delta || k != j {
+ t.Fatalf("delta=%d i=%d j=%d k=%d", delta, x.i, j, k)
+ }
+ j = delta
+ }
+ if x.before != magic32 || x.after != magic32 {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, magic32, magic32)
+ }
+}
+
+func TestSwapInt64(t *testing.T) {
+ if test64err != nil {
+ t.Skipf("Skipping 64-bit tests: %v", test64err)
+ }
+ var x struct {
+ before int64
+ i int64
+ after int64
+ }
+ x.before = magic64
+ x.after = magic64
+ var j int64
+ for delta := int64(1); delta+delta > delta; delta += delta {
+ k := SwapInt64(&x.i, delta)
+ if x.i != delta || k != j {
+ t.Fatalf("delta=%d i=%d j=%d k=%d", delta, x.i, j, k)
+ }
+ j = delta
+ }
+ if x.before != magic64 || x.after != magic64 {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, uint64(magic64), uint64(magic64))
+ }
+}
+
+func TestSwapUint64(t *testing.T) {
+ if test64err != nil {
+ t.Skipf("Skipping 64-bit tests: %v", test64err)
+ }
+ var x struct {
+ before uint64
+ i uint64
+ after uint64
+ }
+ x.before = magic64
+ x.after = magic64
+ var j uint64
+ for delta := uint64(1); delta+delta > delta; delta += delta {
+ k := SwapUint64(&x.i, delta)
+ if x.i != delta || k != j {
+ t.Fatalf("delta=%d i=%d j=%d k=%d", delta, x.i, j, k)
+ }
+ j = delta
+ }
+ if x.before != magic64 || x.after != magic64 {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, uint64(magic64), uint64(magic64))
+ }
+}
+
+func TestSwapUintptr(t *testing.T) {
+ var x struct {
+ before uintptr
+ i uintptr
+ after uintptr
+ }
+ var m uint64 = magic64
+ magicptr := uintptr(m)
+ x.before = magicptr
+ x.after = magicptr
+ var j uintptr
+ for delta := uintptr(1); delta+delta > delta; delta += delta {
+ k := SwapUintptr(&x.i, delta)
+ if x.i != delta || k != j {
+ t.Fatalf("delta=%d i=%d j=%d k=%d", delta, x.i, j, k)
+ }
+ j = delta
+ }
+ if x.before != magicptr || x.after != magicptr {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, magicptr, magicptr)
+ }
+}
+
+func TestSwapPointer(t *testing.T) {
+ var x struct {
+ before uintptr
+ i unsafe.Pointer
+ after uintptr
+ }
+ var m uint64 = magic64
+ magicptr := uintptr(m)
+ x.before = magicptr
+ x.after = magicptr
+ var j uintptr
+ for delta := uintptr(1); delta+delta > delta; delta += delta {
+ k := SwapPointer(&x.i, unsafe.Pointer(delta))
+ if uintptr(x.i) != delta || uintptr(k) != j {
+ t.Fatalf("delta=%d i=%d j=%d k=%d", delta, x.i, j, k)
+ }
+ j = delta
+ }
+ if x.before != magicptr || x.after != magicptr {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, magicptr, magicptr)
+ }
+}
+
+func TestAddInt32(t *testing.T) {
+ var x struct {
+ before int32
+ i int32
+ after int32
+ }
+ x.before = magic32
+ x.after = magic32
+ var j int32
+ for delta := int32(1); delta+delta > delta; delta += delta {
+ k := AddInt32(&x.i, delta)
+ j += delta
+ if x.i != j || k != j {
+ t.Fatalf("delta=%d i=%d j=%d k=%d", delta, x.i, j, k)
+ }
+ }
+ if x.before != magic32 || x.after != magic32 {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, magic32, magic32)
+ }
+}
+
+func TestAddUint32(t *testing.T) {
+ var x struct {
+ before uint32
+ i uint32
+ after uint32
+ }
+ x.before = magic32
+ x.after = magic32
+ var j uint32
+ for delta := uint32(1); delta+delta > delta; delta += delta {
+ k := AddUint32(&x.i, delta)
+ j += delta
+ if x.i != j || k != j {
+ t.Fatalf("delta=%d i=%d j=%d k=%d", delta, x.i, j, k)
+ }
+ }
+ if x.before != magic32 || x.after != magic32 {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, magic32, magic32)
+ }
+}
+
+func TestAddInt64(t *testing.T) {
+ if test64err != nil {
+ t.Skipf("Skipping 64-bit tests: %v", test64err)
+ }
+ var x struct {
+ before int64
+ i int64
+ after int64
+ }
+ x.before = magic64
+ x.after = magic64
+ var j int64
+ for delta := int64(1); delta+delta > delta; delta += delta {
+ k := AddInt64(&x.i, delta)
+ j += delta
+ if x.i != j || k != j {
+ t.Fatalf("delta=%d i=%d j=%d k=%d", delta, x.i, j, k)
+ }
+ }
+ if x.before != magic64 || x.after != magic64 {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, int64(magic64), int64(magic64))
+ }
+}
+
+func TestAddUint64(t *testing.T) {
+ if test64err != nil {
+ t.Skipf("Skipping 64-bit tests: %v", test64err)
+ }
+ var x struct {
+ before uint64
+ i uint64
+ after uint64
+ }
+ x.before = magic64
+ x.after = magic64
+ var j uint64
+ for delta := uint64(1); delta+delta > delta; delta += delta {
+ k := AddUint64(&x.i, delta)
+ j += delta
+ if x.i != j || k != j {
+ t.Fatalf("delta=%d i=%d j=%d k=%d", delta, x.i, j, k)
+ }
+ }
+ if x.before != magic64 || x.after != magic64 {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, uint64(magic64), uint64(magic64))
+ }
+}
+
+func TestAddUintptr(t *testing.T) {
+ var x struct {
+ before uintptr
+ i uintptr
+ after uintptr
+ }
+ var m uint64 = magic64
+ magicptr := uintptr(m)
+ x.before = magicptr
+ x.after = magicptr
+ var j uintptr
+ for delta := uintptr(1); delta+delta > delta; delta += delta {
+ k := AddUintptr(&x.i, delta)
+ j += delta
+ if x.i != j || k != j {
+ t.Fatalf("delta=%d i=%d j=%d k=%d", delta, x.i, j, k)
+ }
+ }
+ if x.before != magicptr || x.after != magicptr {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, magicptr, magicptr)
+ }
+}
+
+func TestCompareAndSwapInt32(t *testing.T) {
+ var x struct {
+ before int32
+ i int32
+ after int32
+ }
+ x.before = magic32
+ x.after = magic32
+ for val := int32(1); val+val > val; val += val {
+ x.i = val
+ if !CompareAndSwapInt32(&x.i, val, val+1) {
+ t.Fatalf("should have swapped %#x %#x", val, val+1)
+ }
+ if x.i != val+1 {
+ t.Fatalf("wrong x.i after swap: x.i=%#x val+1=%#x", x.i, val+1)
+ }
+ x.i = val + 1
+ if CompareAndSwapInt32(&x.i, val, val+2) {
+ t.Fatalf("should not have swapped %#x %#x", val, val+2)
+ }
+ if x.i != val+1 {
+ t.Fatalf("wrong x.i after swap: x.i=%#x val+1=%#x", x.i, val+1)
+ }
+ }
+ if x.before != magic32 || x.after != magic32 {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, magic32, magic32)
+ }
+}
+
+func TestCompareAndSwapUint32(t *testing.T) {
+ var x struct {
+ before uint32
+ i uint32
+ after uint32
+ }
+ x.before = magic32
+ x.after = magic32
+ for val := uint32(1); val+val > val; val += val {
+ x.i = val
+ if !CompareAndSwapUint32(&x.i, val, val+1) {
+ t.Fatalf("should have swapped %#x %#x", val, val+1)
+ }
+ if x.i != val+1 {
+ t.Fatalf("wrong x.i after swap: x.i=%#x val+1=%#x", x.i, val+1)
+ }
+ x.i = val + 1
+ if CompareAndSwapUint32(&x.i, val, val+2) {
+ t.Fatalf("should not have swapped %#x %#x", val, val+2)
+ }
+ if x.i != val+1 {
+ t.Fatalf("wrong x.i after swap: x.i=%#x val+1=%#x", x.i, val+1)
+ }
+ }
+ if x.before != magic32 || x.after != magic32 {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, magic32, magic32)
+ }
+}
+
+func TestCompareAndSwapInt64(t *testing.T) {
+ if test64err != nil {
+ t.Skipf("Skipping 64-bit tests: %v", test64err)
+ }
+ var x struct {
+ before int64
+ i int64
+ after int64
+ }
+ x.before = magic64
+ x.after = magic64
+ for val := int64(1); val+val > val; val += val {
+ x.i = val
+ if !CompareAndSwapInt64(&x.i, val, val+1) {
+ t.Fatalf("should have swapped %#x %#x", val, val+1)
+ }
+ if x.i != val+1 {
+ t.Fatalf("wrong x.i after swap: x.i=%#x val+1=%#x", x.i, val+1)
+ }
+ x.i = val + 1
+ if CompareAndSwapInt64(&x.i, val, val+2) {
+ t.Fatalf("should not have swapped %#x %#x", val, val+2)
+ }
+ if x.i != val+1 {
+ t.Fatalf("wrong x.i after swap: x.i=%#x val+1=%#x", x.i, val+1)
+ }
+ }
+ if x.before != magic64 || x.after != magic64 {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, uint64(magic64), uint64(magic64))
+ }
+}
+
+func testCompareAndSwapUint64(t *testing.T, cas func(*uint64, uint64, uint64) bool) {
+ if test64err != nil {
+ t.Skipf("Skipping 64-bit tests: %v", test64err)
+ }
+ var x struct {
+ before uint64
+ i uint64
+ after uint64
+ }
+ x.before = magic64
+ x.after = magic64
+ for val := uint64(1); val+val > val; val += val {
+ x.i = val
+ if !cas(&x.i, val, val+1) {
+ t.Fatalf("should have swapped %#x %#x", val, val+1)
+ }
+ if x.i != val+1 {
+ t.Fatalf("wrong x.i after swap: x.i=%#x val+1=%#x", x.i, val+1)
+ }
+ x.i = val + 1
+ if cas(&x.i, val, val+2) {
+ t.Fatalf("should not have swapped %#x %#x", val, val+2)
+ }
+ if x.i != val+1 {
+ t.Fatalf("wrong x.i after swap: x.i=%#x val+1=%#x", x.i, val+1)
+ }
+ }
+ if x.before != magic64 || x.after != magic64 {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, uint64(magic64), uint64(magic64))
+ }
+}
+
+func TestCompareAndSwapUint64(t *testing.T) {
+ testCompareAndSwapUint64(t, CompareAndSwapUint64)
+}
+
+func TestCompareAndSwapUintptr(t *testing.T) {
+ var x struct {
+ before uintptr
+ i uintptr
+ after uintptr
+ }
+ var m uint64 = magic64
+ magicptr := uintptr(m)
+ x.before = magicptr
+ x.after = magicptr
+ for val := uintptr(1); val+val > val; val += val {
+ x.i = val
+ if !CompareAndSwapUintptr(&x.i, val, val+1) {
+ t.Fatalf("should have swapped %#x %#x", val, val+1)
+ }
+ if x.i != val+1 {
+ t.Fatalf("wrong x.i after swap: x.i=%#x val+1=%#x", x.i, val+1)
+ }
+ x.i = val + 1
+ if CompareAndSwapUintptr(&x.i, val, val+2) {
+ t.Fatalf("should not have swapped %#x %#x", val, val+2)
+ }
+ if x.i != val+1 {
+ t.Fatalf("wrong x.i after swap: x.i=%#x val+1=%#x", x.i, val+1)
+ }
+ }
+ if x.before != magicptr || x.after != magicptr {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, magicptr, magicptr)
+ }
+}
+
+func TestCompareAndSwapPointer(t *testing.T) {
+ var x struct {
+ before uintptr
+ i unsafe.Pointer
+ after uintptr
+ }
+ var m uint64 = magic64
+ magicptr := uintptr(m)
+ x.before = magicptr
+ x.after = magicptr
+ for val := uintptr(1); val+val > val; val += val {
+ x.i = unsafe.Pointer(val)
+ if !CompareAndSwapPointer(&x.i, unsafe.Pointer(val), unsafe.Pointer(val+1)) {
+ t.Fatalf("should have swapped %#x %#x", val, val+1)
+ }
+ if x.i != unsafe.Pointer(val+1) {
+ t.Fatalf("wrong x.i after swap: x.i=%#x val+1=%#x", x.i, val+1)
+ }
+ x.i = unsafe.Pointer(val + 1)
+ if CompareAndSwapPointer(&x.i, unsafe.Pointer(val), unsafe.Pointer(val+2)) {
+ t.Fatalf("should not have swapped %#x %#x", val, val+2)
+ }
+ if x.i != unsafe.Pointer(val+1) {
+ t.Fatalf("wrong x.i after swap: x.i=%#x val+1=%#x", x.i, val+1)
+ }
+ }
+ if x.before != magicptr || x.after != magicptr {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, magicptr, magicptr)
+ }
+}
+
+func TestLoadInt32(t *testing.T) {
+ var x struct {
+ before int32
+ i int32
+ after int32
+ }
+ x.before = magic32
+ x.after = magic32
+ for delta := int32(1); delta+delta > delta; delta += delta {
+ k := LoadInt32(&x.i)
+ if k != x.i {
+ t.Fatalf("delta=%d i=%d k=%d", delta, x.i, k)
+ }
+ x.i += delta
+ }
+ if x.before != magic32 || x.after != magic32 {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, magic32, magic32)
+ }
+}
+
+func TestLoadUint32(t *testing.T) {
+ var x struct {
+ before uint32
+ i uint32
+ after uint32
+ }
+ x.before = magic32
+ x.after = magic32
+ for delta := uint32(1); delta+delta > delta; delta += delta {
+ k := LoadUint32(&x.i)
+ if k != x.i {
+ t.Fatalf("delta=%d i=%d k=%d", delta, x.i, k)
+ }
+ x.i += delta
+ }
+ if x.before != magic32 || x.after != magic32 {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, magic32, magic32)
+ }
+}
+
+func TestLoadInt64(t *testing.T) {
+ if test64err != nil {
+ t.Skipf("Skipping 64-bit tests: %v", test64err)
+ }
+ var x struct {
+ before int64
+ i int64
+ after int64
+ }
+ x.before = magic64
+ x.after = magic64
+ for delta := int64(1); delta+delta > delta; delta += delta {
+ k := LoadInt64(&x.i)
+ if k != x.i {
+ t.Fatalf("delta=%d i=%d k=%d", delta, x.i, k)
+ }
+ x.i += delta
+ }
+ if x.before != magic64 || x.after != magic64 {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, uint64(magic64), uint64(magic64))
+ }
+}
+
+func TestLoadUint64(t *testing.T) {
+ if test64err != nil {
+ t.Skipf("Skipping 64-bit tests: %v", test64err)
+ }
+ var x struct {
+ before uint64
+ i uint64
+ after uint64
+ }
+ x.before = magic64
+ x.after = magic64
+ for delta := uint64(1); delta+delta > delta; delta += delta {
+ k := LoadUint64(&x.i)
+ if k != x.i {
+ t.Fatalf("delta=%d i=%d k=%d", delta, x.i, k)
+ }
+ x.i += delta
+ }
+ if x.before != magic64 || x.after != magic64 {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, uint64(magic64), uint64(magic64))
+ }
+}
+
+func TestLoadUintptr(t *testing.T) {
+ var x struct {
+ before uintptr
+ i uintptr
+ after uintptr
+ }
+ var m uint64 = magic64
+ magicptr := uintptr(m)
+ x.before = magicptr
+ x.after = magicptr
+ for delta := uintptr(1); delta+delta > delta; delta += delta {
+ k := LoadUintptr(&x.i)
+ if k != x.i {
+ t.Fatalf("delta=%d i=%d k=%d", delta, x.i, k)
+ }
+ x.i += delta
+ }
+ if x.before != magicptr || x.after != magicptr {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, magicptr, magicptr)
+ }
+}
+
+func TestLoadPointer(t *testing.T) {
+ var x struct {
+ before uintptr
+ i unsafe.Pointer
+ after uintptr
+ }
+ var m uint64 = magic64
+ magicptr := uintptr(m)
+ x.before = magicptr
+ x.after = magicptr
+ for delta := uintptr(1); delta+delta > delta; delta += delta {
+ k := LoadPointer(&x.i)
+ if k != x.i {
+ t.Fatalf("delta=%d i=%d k=%d", delta, x.i, k)
+ }
+ x.i = unsafe.Pointer(uintptr(x.i) + delta)
+ }
+ if x.before != magicptr || x.after != magicptr {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, magicptr, magicptr)
+ }
+}
+
+func TestStoreInt32(t *testing.T) {
+ var x struct {
+ before int32
+ i int32
+ after int32
+ }
+ x.before = magic32
+ x.after = magic32
+ v := int32(0)
+ for delta := int32(1); delta+delta > delta; delta += delta {
+ StoreInt32(&x.i, v)
+ if x.i != v {
+ t.Fatalf("delta=%d i=%d v=%d", delta, x.i, v)
+ }
+ v += delta
+ }
+ if x.before != magic32 || x.after != magic32 {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, magic32, magic32)
+ }
+}
+
+func TestStoreUint32(t *testing.T) {
+ var x struct {
+ before uint32
+ i uint32
+ after uint32
+ }
+ x.before = magic32
+ x.after = magic32
+ v := uint32(0)
+ for delta := uint32(1); delta+delta > delta; delta += delta {
+ StoreUint32(&x.i, v)
+ if x.i != v {
+ t.Fatalf("delta=%d i=%d v=%d", delta, x.i, v)
+ }
+ v += delta
+ }
+ if x.before != magic32 || x.after != magic32 {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, magic32, magic32)
+ }
+}
+
+func TestStoreInt64(t *testing.T) {
+ if test64err != nil {
+ t.Skipf("Skipping 64-bit tests: %v", test64err)
+ }
+ var x struct {
+ before int64
+ i int64
+ after int64
+ }
+ x.before = magic64
+ x.after = magic64
+ v := int64(0)
+ for delta := int64(1); delta+delta > delta; delta += delta {
+ StoreInt64(&x.i, v)
+ if x.i != v {
+ t.Fatalf("delta=%d i=%d v=%d", delta, x.i, v)
+ }
+ v += delta
+ }
+ if x.before != magic64 || x.after != magic64 {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, uint64(magic64), uint64(magic64))
+ }
+}
+
+func TestStoreUint64(t *testing.T) {
+ if test64err != nil {
+ t.Skipf("Skipping 64-bit tests: %v", test64err)
+ }
+ var x struct {
+ before uint64
+ i uint64
+ after uint64
+ }
+ x.before = magic64
+ x.after = magic64
+ v := uint64(0)
+ for delta := uint64(1); delta+delta > delta; delta += delta {
+ StoreUint64(&x.i, v)
+ if x.i != v {
+ t.Fatalf("delta=%d i=%d v=%d", delta, x.i, v)
+ }
+ v += delta
+ }
+ if x.before != magic64 || x.after != magic64 {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, uint64(magic64), uint64(magic64))
+ }
+}
+
+func TestStoreUintptr(t *testing.T) {
+ var x struct {
+ before uintptr
+ i uintptr
+ after uintptr
+ }
+ var m uint64 = magic64
+ magicptr := uintptr(m)
+ x.before = magicptr
+ x.after = magicptr
+ v := uintptr(0)
+ for delta := uintptr(1); delta+delta > delta; delta += delta {
+ StoreUintptr(&x.i, v)
+ if x.i != v {
+ t.Fatalf("delta=%d i=%d v=%d", delta, x.i, v)
+ }
+ v += delta
+ }
+ if x.before != magicptr || x.after != magicptr {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, magicptr, magicptr)
+ }
+}
+
+func TestStorePointer(t *testing.T) {
+ var x struct {
+ before uintptr
+ i unsafe.Pointer
+ after uintptr
+ }
+ var m uint64 = magic64
+ magicptr := uintptr(m)
+ x.before = magicptr
+ x.after = magicptr
+ v := unsafe.Pointer(uintptr(0))
+ for delta := uintptr(1); delta+delta > delta; delta += delta {
+ StorePointer(&x.i, unsafe.Pointer(v))
+ if x.i != v {
+ t.Fatalf("delta=%d i=%d v=%d", delta, x.i, v)
+ }
+ v = unsafe.Pointer(uintptr(v) + delta)
+ }
+ if x.before != magicptr || x.after != magicptr {
+ t.Fatalf("wrong magic: %#x _ %#x != %#x _ %#x", x.before, x.after, magicptr, magicptr)
+ }
+}
+
+// Tests of correct behavior, with contention.
+// (Is the function atomic?)
+//
+// For each function, we write a "hammer" function that repeatedly
+// uses the atomic operation to add 1 to a value. After running
+// multiple hammers in parallel, check that we end with the correct
+// total.
+// Swap can't add 1, so it uses a different scheme.
+// The functions repeatedly generate a pseudo-random number such that
+// low bits are equal to high bits, swap, check that the old value
+// has low and high bits equal.
+
+var hammer32 = map[string]func(*uint32, int){
+ "SwapInt32": hammerSwapInt32,
+ "SwapUint32": hammerSwapUint32,
+ "SwapUintptr": hammerSwapUintptr32,
+ "SwapPointer": hammerSwapPointer32,
+ "AddInt32": hammerAddInt32,
+ "AddUint32": hammerAddUint32,
+ "AddUintptr": hammerAddUintptr32,
+ "CompareAndSwapInt32": hammerCompareAndSwapInt32,
+ "CompareAndSwapUint32": hammerCompareAndSwapUint32,
+ "CompareAndSwapUintptr": hammerCompareAndSwapUintptr32,
+ "CompareAndSwapPointer": hammerCompareAndSwapPointer32,
+}
+
+func init() {
+ var v uint64 = 1 << 50
+ if uintptr(v) != 0 {
+ // 64-bit system; clear uintptr tests
+ delete(hammer32, "SwapUintptr")
+ delete(hammer32, "SwapPointer")
+ delete(hammer32, "AddUintptr")
+ delete(hammer32, "CompareAndSwapUintptr")
+ delete(hammer32, "CompareAndSwapPointer")
+ }
+}
+
+func hammerSwapInt32(uaddr *uint32, count int) {
+ addr := (*int32)(unsafe.Pointer(uaddr))
+ seed := int(uintptr(unsafe.Pointer(&count)))
+ for i := 0; i < count; i++ {
+ new := uint32(seed+i)<<16 | uint32(seed+i)<<16>>16
+ old := uint32(SwapInt32(addr, int32(new)))
+ if old>>16 != old<<16>>16 {
+ panic(fmt.Sprintf("SwapInt32 is not atomic: %v", old))
+ }
+ }
+}
+
+func hammerSwapUint32(addr *uint32, count int) {
+ seed := int(uintptr(unsafe.Pointer(&count)))
+ for i := 0; i < count; i++ {
+ new := uint32(seed+i)<<16 | uint32(seed+i)<<16>>16
+ old := SwapUint32(addr, new)
+ if old>>16 != old<<16>>16 {
+ panic(fmt.Sprintf("SwapUint32 is not atomic: %v", old))
+ }
+ }
+}
+
+func hammerSwapUintptr32(uaddr *uint32, count int) {
+ // only safe when uintptr is 32-bit.
+ // not called on 64-bit systems.
+ addr := (*uintptr)(unsafe.Pointer(uaddr))
+ seed := int(uintptr(unsafe.Pointer(&count)))
+ for i := 0; i < count; i++ {
+ new := uintptr(seed+i)<<16 | uintptr(seed+i)<<16>>16
+ old := SwapUintptr(addr, new)
+ if old>>16 != old<<16>>16 {
+ panic(fmt.Sprintf("SwapUintptr is not atomic: %#08x", old))
+ }
+ }
+}
+
+func hammerSwapPointer32(uaddr *uint32, count int) {
+ // only safe when uintptr is 32-bit.
+ // not called on 64-bit systems.
+ addr := (*unsafe.Pointer)(unsafe.Pointer(uaddr))
+ seed := int(uintptr(unsafe.Pointer(&count)))
+ for i := 0; i < count; i++ {
+ new := uintptr(seed+i)<<16 | uintptr(seed+i)<<16>>16
+ old := uintptr(SwapPointer(addr, unsafe.Pointer(new)))
+ if old>>16 != old<<16>>16 {
+ panic(fmt.Sprintf("SwapPointer is not atomic: %#08x", old))
+ }
+ }
+}
+
+func hammerAddInt32(uaddr *uint32, count int) {
+ addr := (*int32)(unsafe.Pointer(uaddr))
+ for i := 0; i < count; i++ {
+ AddInt32(addr, 1)
+ }
+}
+
+func hammerAddUint32(addr *uint32, count int) {
+ for i := 0; i < count; i++ {
+ AddUint32(addr, 1)
+ }
+}
+
+func hammerAddUintptr32(uaddr *uint32, count int) {
+ // only safe when uintptr is 32-bit.
+ // not called on 64-bit systems.
+ addr := (*uintptr)(unsafe.Pointer(uaddr))
+ for i := 0; i < count; i++ {
+ AddUintptr(addr, 1)
+ }
+}
+
+func hammerCompareAndSwapInt32(uaddr *uint32, count int) {
+ addr := (*int32)(unsafe.Pointer(uaddr))
+ for i := 0; i < count; i++ {
+ for {
+ v := LoadInt32(addr)
+ if CompareAndSwapInt32(addr, v, v+1) {
+ break
+ }
+ }
+ }
+}
+
+func hammerCompareAndSwapUint32(addr *uint32, count int) {
+ for i := 0; i < count; i++ {
+ for {
+ v := LoadUint32(addr)
+ if CompareAndSwapUint32(addr, v, v+1) {
+ break
+ }
+ }
+ }
+}
+
+func hammerCompareAndSwapUintptr32(uaddr *uint32, count int) {
+ // only safe when uintptr is 32-bit.
+ // not called on 64-bit systems.
+ addr := (*uintptr)(unsafe.Pointer(uaddr))
+ for i := 0; i < count; i++ {
+ for {
+ v := LoadUintptr(addr)
+ if CompareAndSwapUintptr(addr, v, v+1) {
+ break
+ }
+ }
+ }
+}
+
+func hammerCompareAndSwapPointer32(uaddr *uint32, count int) {
+ // only safe when uintptr is 32-bit.
+ // not called on 64-bit systems.
+ addr := (*unsafe.Pointer)(unsafe.Pointer(uaddr))
+ for i := 0; i < count; i++ {
+ for {
+ v := LoadPointer(addr)
+ if CompareAndSwapPointer(addr, v, unsafe.Pointer(uintptr(v)+1)) {
+ break
+ }
+ }
+ }
+}
+
+func TestHammer32(t *testing.T) {
+ const p = 4
+ n := 100000
+ if testing.Short() {
+ n = 1000
+ }
+ defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(p))
+
+ for name, testf := range hammer32 {
+ c := make(chan int)
+ var val uint32
+ for i := 0; i < p; i++ {
+ go func() {
+ defer func() {
+ if err := recover(); err != nil {
+ t.Error(err.(string))
+ }
+ c <- 1
+ }()
+ testf(&val, n)
+ }()
+ }
+ for i := 0; i < p; i++ {
+ <-c
+ }
+ if !strings.HasPrefix(name, "Swap") && val != uint32(n)*p {
+ t.Fatalf("%s: val=%d want %d", name, val, n*p)
+ }
+ }
+}
+
+var hammer64 = map[string]func(*uint64, int){
+ "SwapInt64": hammerSwapInt64,
+ "SwapUint64": hammerSwapUint64,
+ "SwapUintptr": hammerSwapUintptr64,
+ "SwapPointer": hammerSwapPointer64,
+ "AddInt64": hammerAddInt64,
+ "AddUint64": hammerAddUint64,
+ "AddUintptr": hammerAddUintptr64,
+ "CompareAndSwapInt64": hammerCompareAndSwapInt64,
+ "CompareAndSwapUint64": hammerCompareAndSwapUint64,
+ "CompareAndSwapUintptr": hammerCompareAndSwapUintptr64,
+ "CompareAndSwapPointer": hammerCompareAndSwapPointer64,
+}
+
+func init() {
+ var v uint64 = 1 << 50
+ if uintptr(v) == 0 {
+ // 32-bit system; clear uintptr tests
+ delete(hammer64, "SwapUintptr")
+ delete(hammer64, "SwapPointer")
+ delete(hammer64, "AddUintptr")
+ delete(hammer64, "CompareAndSwapUintptr")
+ delete(hammer64, "CompareAndSwapPointer")
+ }
+}
+
+func hammerSwapInt64(uaddr *uint64, count int) {
+ addr := (*int64)(unsafe.Pointer(uaddr))
+ seed := int(uintptr(unsafe.Pointer(&count)))
+ for i := 0; i < count; i++ {
+ new := uint64(seed+i)<<32 | uint64(seed+i)<<32>>32
+ old := uint64(SwapInt64(addr, int64(new)))
+ if old>>32 != old<<32>>32 {
+ panic(fmt.Sprintf("SwapInt64 is not atomic: %v", old))
+ }
+ }
+}
+
+func hammerSwapUint64(addr *uint64, count int) {
+ seed := int(uintptr(unsafe.Pointer(&count)))
+ for i := 0; i < count; i++ {
+ new := uint64(seed+i)<<32 | uint64(seed+i)<<32>>32
+ old := SwapUint64(addr, new)
+ if old>>32 != old<<32>>32 {
+ panic(fmt.Sprintf("SwapUint64 is not atomic: %v", old))
+ }
+ }
+}
+
+func hammerSwapUintptr64(uaddr *uint64, count int) {
+ // only safe when uintptr is 64-bit.
+ // not called on 32-bit systems.
+ addr := (*uintptr)(unsafe.Pointer(uaddr))
+ seed := int(uintptr(unsafe.Pointer(&count)))
+ for i := 0; i < count; i++ {
+ new := uintptr(seed+i)<<32 | uintptr(seed+i)<<32>>32
+ old := SwapUintptr(addr, new)
+ if old>>32 != old<<32>>32 {
+ panic(fmt.Sprintf("SwapUintptr is not atomic: %v", old))
+ }
+ }
+}
+
+func hammerSwapPointer64(uaddr *uint64, count int) {
+ // only safe when uintptr is 64-bit.
+ // not called on 32-bit systems.
+ addr := (*unsafe.Pointer)(unsafe.Pointer(uaddr))
+ seed := int(uintptr(unsafe.Pointer(&count)))
+ for i := 0; i < count; i++ {
+ new := uintptr(seed+i)<<32 | uintptr(seed+i)<<32>>32
+ old := uintptr(SwapPointer(addr, unsafe.Pointer(new)))
+ if old>>32 != old<<32>>32 {
+ panic(fmt.Sprintf("SwapPointer is not atomic: %v", old))
+ }
+ }
+}
+
+func hammerAddInt64(uaddr *uint64, count int) {
+ addr := (*int64)(unsafe.Pointer(uaddr))
+ for i := 0; i < count; i++ {
+ AddInt64(addr, 1)
+ }
+}
+
+func hammerAddUint64(addr *uint64, count int) {
+ for i := 0; i < count; i++ {
+ AddUint64(addr, 1)
+ }
+}
+
+func hammerAddUintptr64(uaddr *uint64, count int) {
+ // only safe when uintptr is 64-bit.
+ // not called on 32-bit systems.
+ addr := (*uintptr)(unsafe.Pointer(uaddr))
+ for i := 0; i < count; i++ {
+ AddUintptr(addr, 1)
+ }
+}
+
+func hammerCompareAndSwapInt64(uaddr *uint64, count int) {
+ addr := (*int64)(unsafe.Pointer(uaddr))
+ for i := 0; i < count; i++ {
+ for {
+ v := LoadInt64(addr)
+ if CompareAndSwapInt64(addr, v, v+1) {
+ break
+ }
+ }
+ }
+}
+
+func hammerCompareAndSwapUint64(addr *uint64, count int) {
+ for i := 0; i < count; i++ {
+ for {
+ v := LoadUint64(addr)
+ if CompareAndSwapUint64(addr, v, v+1) {
+ break
+ }
+ }
+ }
+}
+
+func hammerCompareAndSwapUintptr64(uaddr *uint64, count int) {
+ // only safe when uintptr is 64-bit.
+ // not called on 32-bit systems.
+ addr := (*uintptr)(unsafe.Pointer(uaddr))
+ for i := 0; i < count; i++ {
+ for {
+ v := LoadUintptr(addr)
+ if CompareAndSwapUintptr(addr, v, v+1) {
+ break
+ }
+ }
+ }
+}
+
+func hammerCompareAndSwapPointer64(uaddr *uint64, count int) {
+ // only safe when uintptr is 64-bit.
+ // not called on 32-bit systems.
+ addr := (*unsafe.Pointer)(unsafe.Pointer(uaddr))
+ for i := 0; i < count; i++ {
+ for {
+ v := LoadPointer(addr)
+ if CompareAndSwapPointer(addr, v, unsafe.Pointer(uintptr(v)+1)) {
+ break
+ }
+ }
+ }
+}
+
+func TestHammer64(t *testing.T) {
+ if test64err != nil {
+ t.Skipf("Skipping 64-bit tests: %v", test64err)
+ }
+ const p = 4
+ n := 100000
+ if testing.Short() {
+ n = 1000
+ }
+ defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(p))
+
+ for name, testf := range hammer64 {
+ c := make(chan int)
+ var val uint64
+ for i := 0; i < p; i++ {
+ go func() {
+ defer func() {
+ if err := recover(); err != nil {
+ t.Error(err.(string))
+ }
+ c <- 1
+ }()
+ testf(&val, n)
+ }()
+ }
+ for i := 0; i < p; i++ {
+ <-c
+ }
+ if !strings.HasPrefix(name, "Swap") && val != uint64(n)*p {
+ t.Fatalf("%s: val=%d want %d", name, val, n*p)
+ }
+ }
+}
+
+func hammerStoreLoadInt32(t *testing.T, paddr unsafe.Pointer) {
+ addr := (*int32)(paddr)
+ v := LoadInt32(addr)
+ vlo := v & ((1 << 16) - 1)
+ vhi := v >> 16
+ if vlo != vhi {
+ t.Fatalf("Int32: %#x != %#x", vlo, vhi)
+ }
+ new := v + 1 + 1<<16
+ if vlo == 1e4 {
+ new = 0
+ }
+ StoreInt32(addr, new)
+}
+
+func hammerStoreLoadUint32(t *testing.T, paddr unsafe.Pointer) {
+ addr := (*uint32)(paddr)
+ v := LoadUint32(addr)
+ vlo := v & ((1 << 16) - 1)
+ vhi := v >> 16
+ if vlo != vhi {
+ t.Fatalf("Uint32: %#x != %#x", vlo, vhi)
+ }
+ new := v + 1 + 1<<16
+ if vlo == 1e4 {
+ new = 0
+ }
+ StoreUint32(addr, new)
+}
+
+func hammerStoreLoadInt64(t *testing.T, paddr unsafe.Pointer) {
+ addr := (*int64)(paddr)
+ v := LoadInt64(addr)
+ vlo := v & ((1 << 32) - 1)
+ vhi := v >> 32
+ if vlo != vhi {
+ t.Fatalf("Int64: %#x != %#x", vlo, vhi)
+ }
+ new := v + 1 + 1<<32
+ StoreInt64(addr, new)
+}
+
+func hammerStoreLoadUint64(t *testing.T, paddr unsafe.Pointer) {
+ addr := (*uint64)(paddr)
+ v := LoadUint64(addr)
+ vlo := v & ((1 << 32) - 1)
+ vhi := v >> 32
+ if vlo != vhi {
+ t.Fatalf("Uint64: %#x != %#x", vlo, vhi)
+ }
+ new := v + 1 + 1<<32
+ StoreUint64(addr, new)
+}
+
+func hammerStoreLoadUintptr(t *testing.T, paddr unsafe.Pointer) {
+ addr := (*uintptr)(paddr)
+ var test64 uint64 = 1 << 50
+ arch32 := uintptr(test64) == 0
+ v := LoadUintptr(addr)
+ new := v
+ if arch32 {
+ vlo := v & ((1 << 16) - 1)
+ vhi := v >> 16
+ if vlo != vhi {
+ t.Fatalf("Uintptr: %#x != %#x", vlo, vhi)
+ }
+ new = v + 1 + 1<<16
+ if vlo == 1e4 {
+ new = 0
+ }
+ } else {
+ vlo := v & ((1 << 32) - 1)
+ vhi := v >> 32
+ if vlo != vhi {
+ t.Fatalf("Uintptr: %#x != %#x", vlo, vhi)
+ }
+ inc := uint64(1 + 1<<32)
+ new = v + uintptr(inc)
+ }
+ StoreUintptr(addr, new)
+}
+
+func hammerStoreLoadPointer(t *testing.T, paddr unsafe.Pointer) {
+ addr := (*unsafe.Pointer)(paddr)
+ var test64 uint64 = 1 << 50
+ arch32 := uintptr(test64) == 0
+ v := uintptr(LoadPointer(addr))
+ new := v
+ if arch32 {
+ vlo := v & ((1 << 16) - 1)
+ vhi := v >> 16
+ if vlo != vhi {
+ t.Fatalf("Pointer: %#x != %#x", vlo, vhi)
+ }
+ new = v + 1 + 1<<16
+ if vlo == 1e4 {
+ new = 0
+ }
+ } else {
+ vlo := v & ((1 << 32) - 1)
+ vhi := v >> 32
+ if vlo != vhi {
+ t.Fatalf("Pointer: %#x != %#x", vlo, vhi)
+ }
+ inc := uint64(1 + 1<<32)
+ new = v + uintptr(inc)
+ }
+ StorePointer(addr, unsafe.Pointer(new))
+}
+
+func TestHammerStoreLoad(t *testing.T) {
+ var tests []func(*testing.T, unsafe.Pointer)
+ tests = append(tests, hammerStoreLoadInt32, hammerStoreLoadUint32,
+ hammerStoreLoadUintptr, hammerStoreLoadPointer)
+ if test64err == nil {
+ tests = append(tests, hammerStoreLoadInt64, hammerStoreLoadUint64)
+ }
+ n := int(1e6)
+ if testing.Short() {
+ n = int(1e4)
+ }
+ const procs = 8
+ defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(procs))
+ for _, tt := range tests {
+ c := make(chan int)
+ var val uint64
+ for p := 0; p < procs; p++ {
+ go func() {
+ for i := 0; i < n; i++ {
+ tt(t, unsafe.Pointer(&val))
+ }
+ c <- 1
+ }()
+ }
+ for p := 0; p < procs; p++ {
+ <-c
+ }
+ }
+}
+
+func TestStoreLoadSeqCst32(t *testing.T) {
+ if runtime.NumCPU() == 1 {
+ t.Skipf("Skipping test on %v processor machine", runtime.NumCPU())
+ }
+ defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(4))
+ N := int32(1e3)
+ if testing.Short() {
+ N = int32(1e2)
+ }
+ c := make(chan bool, 2)
+ X := [2]int32{}
+ ack := [2][3]int32{{-1, -1, -1}, {-1, -1, -1}}
+ for p := 0; p < 2; p++ {
+ go func(me int) {
+ he := 1 - me
+ for i := int32(1); i < N; i++ {
+ StoreInt32(&X[me], i)
+ my := LoadInt32(&X[he])
+ StoreInt32(&ack[me][i%3], my)
+ for w := 1; LoadInt32(&ack[he][i%3]) == -1; w++ {
+ if w%1000 == 0 {
+ runtime.Gosched()
+ }
+ }
+ his := LoadInt32(&ack[he][i%3])
+ if (my != i && my != i-1) || (his != i && his != i-1) {
+ t.Fatalf("invalid values: %d/%d (%d)", my, his, i)
+ }
+ if my != i && his != i {
+ t.Fatalf("store/load are not sequentially consistent: %d/%d (%d)", my, his, i)
+ }
+ StoreInt32(&ack[me][(i-1)%3], -1)
+ }
+ c <- true
+ }(p)
+ }
+ <-c
+ <-c
+}
+
+func TestStoreLoadSeqCst64(t *testing.T) {
+ if runtime.NumCPU() == 1 {
+ t.Skipf("Skipping test on %v processor machine", runtime.NumCPU())
+ }
+ if test64err != nil {
+ t.Skipf("Skipping 64-bit tests: %v", test64err)
+ }
+ defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(4))
+ N := int64(1e3)
+ if testing.Short() {
+ N = int64(1e2)
+ }
+ c := make(chan bool, 2)
+ X := [2]int64{}
+ ack := [2][3]int64{{-1, -1, -1}, {-1, -1, -1}}
+ for p := 0; p < 2; p++ {
+ go func(me int) {
+ he := 1 - me
+ for i := int64(1); i < N; i++ {
+ StoreInt64(&X[me], i)
+ my := LoadInt64(&X[he])
+ StoreInt64(&ack[me][i%3], my)
+ for w := 1; LoadInt64(&ack[he][i%3]) == -1; w++ {
+ if w%1000 == 0 {
+ runtime.Gosched()
+ }
+ }
+ his := LoadInt64(&ack[he][i%3])
+ if (my != i && my != i-1) || (his != i && his != i-1) {
+ t.Fatalf("invalid values: %d/%d (%d)", my, his, i)
+ }
+ if my != i && his != i {
+ t.Fatalf("store/load are not sequentially consistent: %d/%d (%d)", my, his, i)
+ }
+ StoreInt64(&ack[me][(i-1)%3], -1)
+ }
+ c <- true
+ }(p)
+ }
+ <-c
+ <-c
+}
+
+func TestStoreLoadRelAcq32(t *testing.T) {
+ if runtime.NumCPU() == 1 {
+ t.Skipf("Skipping test on %v processor machine", runtime.NumCPU())
+ }
+ defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(4))
+ N := int32(1e3)
+ if testing.Short() {
+ N = int32(1e2)
+ }
+ c := make(chan bool, 2)
+ type Data struct {
+ signal int32
+ pad1 [128]int8
+ data1 int32
+ pad2 [128]int8
+ data2 float32
+ }
+ var X Data
+ for p := int32(0); p < 2; p++ {
+ go func(p int32) {
+ for i := int32(1); i < N; i++ {
+ if (i+p)%2 == 0 {
+ X.data1 = i
+ X.data2 = float32(i)
+ StoreInt32(&X.signal, i)
+ } else {
+ for w := 1; LoadInt32(&X.signal) != i; w++ {
+ if w%1000 == 0 {
+ runtime.Gosched()
+ }
+ }
+ d1 := X.data1
+ d2 := X.data2
+ if d1 != i || d2 != float32(i) {
+ t.Fatalf("incorrect data: %d/%g (%d)", d1, d2, i)
+ }
+ }
+ }
+ c <- true
+ }(p)
+ }
+ <-c
+ <-c
+}
+
+func TestStoreLoadRelAcq64(t *testing.T) {
+ if runtime.NumCPU() == 1 {
+ t.Skipf("Skipping test on %v processor machine", runtime.NumCPU())
+ }
+ if test64err != nil {
+ t.Skipf("Skipping 64-bit tests: %v", test64err)
+ }
+ defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(4))
+ N := int64(1e3)
+ if testing.Short() {
+ N = int64(1e2)
+ }
+ c := make(chan bool, 2)
+ type Data struct {
+ signal int64
+ pad1 [128]int8
+ data1 int64
+ pad2 [128]int8
+ data2 float64
+ }
+ var X Data
+ for p := int64(0); p < 2; p++ {
+ go func(p int64) {
+ for i := int64(1); i < N; i++ {
+ if (i+p)%2 == 0 {
+ X.data1 = i
+ X.data2 = float64(i)
+ StoreInt64(&X.signal, i)
+ } else {
+ for w := 1; LoadInt64(&X.signal) != i; w++ {
+ if w%1000 == 0 {
+ runtime.Gosched()
+ }
+ }
+ d1 := X.data1
+ d2 := X.data2
+ if d1 != i || d2 != float64(i) {
+ t.Fatalf("incorrect data: %d/%g (%d)", d1, d2, i)
+ }
+ }
+ }
+ c <- true
+ }(p)
+ }
+ <-c
+ <-c
+}
+
+func shouldPanic(t *testing.T, name string, f func()) {
+ defer func() {
+ if recover() == nil {
+ t.Errorf("%s did not panic", name)
+ }
+ }()
+ f()
+}
+
+func TestUnaligned64(t *testing.T) {
+ // Unaligned 64-bit atomics on 32-bit systems are
+ // a continual source of pain. Test that on 32-bit systems they crash
+ // instead of failing silently.
+ if unsafe.Sizeof(int(0)) != 4 {
+ t.Skip("test only runs on 32-bit systems")
+ }
+
+ x := make([]uint32, 4)
+ p := (*uint64)(unsafe.Pointer(&x[1])) // misaligned
+
+ shouldPanic(t, "LoadUint64", func() { LoadUint64(p) })
+ shouldPanic(t, "StoreUint64", func() { StoreUint64(p, 1) })
+ shouldPanic(t, "CompareAndSwapUint64", func() { CompareAndSwapUint64(p, 1, 2) })
+ shouldPanic(t, "AddUint64", func() { AddUint64(p, 3) })
+}
+
+func TestNilDeref(t *testing.T) {
+ if p := runtime.GOOS + "/" + runtime.GOARCH; p == "freebsd/arm" || p == "netbsd/arm" {
+ t.Skipf("issue 7338: skipping test on %q", p)
+ }
+ funcs := [...]func(){
+ func() { CompareAndSwapInt32(nil, 0, 0) },
+ func() { CompareAndSwapInt64(nil, 0, 0) },
+ func() { CompareAndSwapUint32(nil, 0, 0) },
+ func() { CompareAndSwapUint64(nil, 0, 0) },
+ func() { CompareAndSwapUintptr(nil, 0, 0) },
+ func() { CompareAndSwapPointer(nil, nil, nil) },
+ func() { SwapInt32(nil, 0) },
+ func() { SwapUint32(nil, 0) },
+ func() { SwapInt64(nil, 0) },
+ func() { SwapUint64(nil, 0) },
+ func() { SwapUintptr(nil, 0) },
+ func() { SwapPointer(nil, nil) },
+ func() { AddInt32(nil, 0) },
+ func() { AddUint32(nil, 0) },
+ func() { AddInt64(nil, 0) },
+ func() { AddUint64(nil, 0) },
+ func() { AddUintptr(nil, 0) },
+ func() { LoadInt32(nil) },
+ func() { LoadInt64(nil) },
+ func() { LoadUint32(nil) },
+ func() { LoadUint64(nil) },
+ func() { LoadUintptr(nil) },
+ func() { LoadPointer(nil) },
+ func() { StoreInt32(nil, 0) },
+ func() { StoreInt64(nil, 0) },
+ func() { StoreUint32(nil, 0) },
+ func() { StoreUint64(nil, 0) },
+ func() { StoreUintptr(nil, 0) },
+ func() { StorePointer(nil, nil) },
+ }
+ for _, f := range funcs {
+ func() {
+ defer func() {
+ runtime.GC()
+ recover()
+ }()
+ f()
+ }()
+ }
+}
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