archive/jdk
1
0
Fork 0
mirror of https://github.com/openjdk/jdk.git synced 2025-09-24 04:54:40 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

8058255: Native jbyte Atomic::cmpxchg for supported x86 platforms

Browse source 
Use the native cmpxchgb instruction on x86.

Reviewed-by: dholmes, kbarrett, phh
This commit is contained in:
Erik Osterlund 2014-10-21 15:07:25 +02:00 • committed by Jesper Wilhelmsson
parent a5d4521aa1
commit a324ff0f31
18 changed files with 165 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

5
hotspot/src/share/vm/runtime/atomic.hpp
View file

@ -28,6 +28,9 @@
#include "memory/allocation.hpp"
class Atomic : AllStatic {
private:
static jbyte cmpxchg_general(jbyte exchange_value, volatile jbyte* dest, jbyte compare_value);
public:
// Atomic operations on jlong types are not available on all 32-bit
// platforms. If atomic ops on jlongs are defined here they must only
@ -104,7 +107,7 @@ class Atomic : AllStatic {
// *dest with exchange_value if the comparison succeeded. Returns prior
// value of *dest. cmpxchg*() provide:
// <fence> compare-and-exchange <membar StoreLoad|StoreStore>
static jbyte cmpxchg (jbyte exchange_value, volatile jbyte* dest, jbyte compare_value);
inline static jbyte cmpxchg (jbyte exchange_value, volatile jbyte* dest, jbyte compare_value);
inline static jint cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value);
// See comment above about using jlong atomics on 32-bit platforms
inline static jlong cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value);