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https://github.com/golang/go
synced 2024-11-23 05:20:11 -07:00
sync/atomic: remove atomic pointer hammer tests
These depend on storing arbitrary integer values using pointer atomics, and we can't support that anymore. Change-Id: I8cadd6d462c3eebdbe7078f43fe7c779fa8f52b3 Reviewed-on: https://go-review.googlesource.com/2311 Reviewed-by: Rick Hudson <rlh@golang.org>
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@ -759,14 +759,12 @@ var hammer32 = map[string]func(*uint32, int){
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"SwapInt32": hammerSwapInt32,
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"SwapUint32": hammerSwapUint32,
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"SwapUintptr": hammerSwapUintptr32,
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"SwapPointer": hammerSwapPointer32,
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"AddInt32": hammerAddInt32,
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"AddUint32": hammerAddUint32,
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"AddUintptr": hammerAddUintptr32,
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"CompareAndSwapInt32": hammerCompareAndSwapInt32,
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"CompareAndSwapUint32": hammerCompareAndSwapUint32,
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"CompareAndSwapUintptr": hammerCompareAndSwapUintptr32,
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"CompareAndSwapPointer": hammerCompareAndSwapPointer32,
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}
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func init() {
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@ -818,20 +816,6 @@ func hammerSwapUintptr32(uaddr *uint32, count int) {
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}
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}
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func hammerSwapPointer32(uaddr *uint32, count int) {
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// only safe when uintptr is 32-bit.
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// not called on 64-bit systems.
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addr := (*unsafe.Pointer)(unsafe.Pointer(uaddr))
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seed := int(uintptr(unsafe.Pointer(&count)))
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for i := 0; i < count; i++ {
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new := uintptr(seed+i)<<16 | uintptr(seed+i)<<16>>16
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old := uintptr(SwapPointer(addr, unsafe.Pointer(new)))
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if old>>16 != old<<16>>16 {
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panic(fmt.Sprintf("SwapPointer is not atomic: %#08x", old))
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}
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}
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}
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func hammerAddInt32(uaddr *uint32, count int) {
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addr := (*int32)(unsafe.Pointer(uaddr))
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for i := 0; i < count; i++ {
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@ -891,20 +875,6 @@ func hammerCompareAndSwapUintptr32(uaddr *uint32, count int) {
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}
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}
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func hammerCompareAndSwapPointer32(uaddr *uint32, count int) {
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// only safe when uintptr is 32-bit.
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// not called on 64-bit systems.
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addr := (*unsafe.Pointer)(unsafe.Pointer(uaddr))
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for i := 0; i < count; i++ {
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for {
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v := LoadPointer(addr)
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if CompareAndSwapPointer(addr, v, unsafe.Pointer(uintptr(v)+1)) {
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break
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}
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}
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}
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}
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func TestHammer32(t *testing.T) {
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const p = 4
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n := 100000
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@ -940,14 +910,12 @@ var hammer64 = map[string]func(*uint64, int){
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"SwapInt64": hammerSwapInt64,
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"SwapUint64": hammerSwapUint64,
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"SwapUintptr": hammerSwapUintptr64,
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"SwapPointer": hammerSwapPointer64,
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"AddInt64": hammerAddInt64,
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"AddUint64": hammerAddUint64,
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"AddUintptr": hammerAddUintptr64,
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"CompareAndSwapInt64": hammerCompareAndSwapInt64,
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"CompareAndSwapUint64": hammerCompareAndSwapUint64,
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"CompareAndSwapUintptr": hammerCompareAndSwapUintptr64,
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"CompareAndSwapPointer": hammerCompareAndSwapPointer64,
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}
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func init() {
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@ -999,20 +967,6 @@ func hammerSwapUintptr64(uaddr *uint64, count int) {
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}
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}
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func hammerSwapPointer64(uaddr *uint64, count int) {
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// only safe when uintptr is 64-bit.
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// not called on 32-bit systems.
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addr := (*unsafe.Pointer)(unsafe.Pointer(uaddr))
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seed := int(uintptr(unsafe.Pointer(&count)))
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for i := 0; i < count; i++ {
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new := uintptr(seed+i)<<32 | uintptr(seed+i)<<32>>32
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old := uintptr(SwapPointer(addr, unsafe.Pointer(new)))
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if old>>32 != old<<32>>32 {
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panic(fmt.Sprintf("SwapPointer is not atomic: %v", old))
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}
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}
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}
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func hammerAddInt64(uaddr *uint64, count int) {
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addr := (*int64)(unsafe.Pointer(uaddr))
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for i := 0; i < count; i++ {
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@ -1072,20 +1026,6 @@ func hammerCompareAndSwapUintptr64(uaddr *uint64, count int) {
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}
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}
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func hammerCompareAndSwapPointer64(uaddr *uint64, count int) {
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// only safe when uintptr is 64-bit.
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// not called on 32-bit systems.
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addr := (*unsafe.Pointer)(unsafe.Pointer(uaddr))
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for i := 0; i < count; i++ {
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for {
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v := LoadPointer(addr)
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if CompareAndSwapPointer(addr, v, unsafe.Pointer(uintptr(v)+1)) {
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break
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}
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}
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}
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}
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func TestHammer64(t *testing.T) {
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if test64err != nil {
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t.Skipf("Skipping 64-bit tests: %v", test64err)
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