runtime: add 64-bit atomics
This is factored out part of:
https://golang.org/cl/5279048/
(Parallel GC)
R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5985047
diff --git a/src/pkg/runtime/runtime.h b/src/pkg/runtime/runtime.h
index 6f5aea1..177de6c 100644
--- a/src/pkg/runtime/runtime.h
+++ b/src/pkg/runtime/runtime.h
@@ -512,13 +512,17 @@
int32 runtime·write(int32, void*, int32);
int32 runtime·mincore(void*, uintptr, byte*);
bool runtime·cas(uint32*, uint32, uint32);
+bool runtime·cas64(uint64*, uint64*, uint64);
bool runtime·casp(void**, void*, void*);
// Don't confuse with XADD x86 instruction,
// this one is actually 'addx', that is, add-and-fetch.
uint32 runtime·xadd(uint32 volatile*, int32);
+uint64 runtime·xadd64(uint64 volatile*, int64);
uint32 runtime·xchg(uint32 volatile*, uint32);
uint32 runtime·atomicload(uint32 volatile*);
void runtime·atomicstore(uint32 volatile*, uint32);
+void runtime·atomicstore64(uint64 volatile*, uint64);
+uint64 runtime·atomicload64(uint64 volatile*);
void* runtime·atomicloadp(void* volatile*);
void runtime·atomicstorep(void* volatile*, void*);
void runtime·jmpdefer(byte*, void*);
