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8004318: JEP-171: Support Unsafe fences intrinsics

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Add three memory-ordering intrinsics to the sun.misc.Unsafe class.

Reviewed-by: twisti, kvn
This commit is contained in:
Aleksey Shipilev 2012-12-18 17:37:44 -08:00 • committed by Vladimir Kozlov
parent 52da261983
commit 4c293ebcd6
5 changed files with 70 additions and 0 deletions
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18
hotspot/src/share/vm/prims/unsafe.cpp
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@ -468,6 +468,21 @@ UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject ob
#endif
UNSAFE_END
UNSAFE_ENTRY(void, Unsafe_LoadFence(JNIEnv *env, jobject unsafe))
UnsafeWrapper("Unsafe_LoadFence");
OrderAccess::acquire();
UNSAFE_END
UNSAFE_ENTRY(void, Unsafe_StoreFence(JNIEnv *env, jobject unsafe))
UnsafeWrapper("Unsafe_StoreFence");
OrderAccess::release();
UNSAFE_END
UNSAFE_ENTRY(void, Unsafe_FullFence(JNIEnv *env, jobject unsafe))
UnsafeWrapper("Unsafe_FullFence");
OrderAccess::fence();
UNSAFE_END
////// Data in the C heap.
// Note: These do not throw NullPointerException for bad pointers.
@ -1550,6 +1565,9 @@ static JNINativeMethod methods[] = {
{CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
{CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
{CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
{CC"loadFence", CC"()V", FN_PTR(Unsafe_LoadFence)},
{CC"storeFence", CC"()V", FN_PTR(Unsafe_StoreFence)},
{CC"fullFence", CC"()V", FN_PTR(Unsafe_FullFence)},
{CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
{CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}