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sync/atomic: remove atomic pointer hammer tests

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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>
This commit is contained in:
Russ Cox 2014-12-30 13:06:52 -05:00
parent ccdb50931f
commit 813386f200
1 changed files with 0 additions and 60 deletions
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60
src/sync/atomic/atomic_test.go
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@ -759,14 +759,12 @@ 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() {
@ -818,20 +816,6 @@ func hammerSwapUintptr32(uaddr *uint32, count int) {
}
}
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++ {
@ -891,20 +875,6 @@ func hammerCompareAndSwapUintptr32(uaddr *uint32, count int) {
}
}
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
@ -940,14 +910,12 @@ 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() {
@ -999,20 +967,6 @@ func hammerSwapUintptr64(uaddr *uint64, count int) {
}
}
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++ {
@ -1072,20 +1026,6 @@ func hammerCompareAndSwapUintptr64(uaddr *uint64, count int) {
}
}
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)