1.1 --- a/src/share/vm/runtime/atomic.hpp Wed Feb 20 12:52:13 2013 -0800
1.2 +++ b/src/share/vm/runtime/atomic.hpp Thu Feb 21 11:16:50 2013 +0100
1.3 @@ -29,10 +29,17 @@
1.4
1.5 class Atomic : AllStatic {
1.6 public:
1.7 + // Atomic operations on jlong types are not available on all 32-bit
1.8 + // platforms. If atomic ops on jlongs are defined here they must only
1.9 + // be used from code that verifies they are available at runtime and
1.10 + // can provide an alternative action if not - see supports_cx8() for
1.11 + // a means to test availability.
1.12 +
1.13 // Atomically store to a location
1.14 inline static void store (jbyte store_value, jbyte* dest);
1.15 inline static void store (jshort store_value, jshort* dest);
1.16 inline static void store (jint store_value, jint* dest);
1.17 + // See comment above about using jlong atomics on 32-bit platforms
1.18 inline static void store (jlong store_value, jlong* dest);
1.19 inline static void store_ptr(intptr_t store_value, intptr_t* dest);
1.20 inline static void store_ptr(void* store_value, void* dest);
1.21 @@ -40,17 +47,19 @@
1.22 inline static void store (jbyte store_value, volatile jbyte* dest);
1.23 inline static void store (jshort store_value, volatile jshort* dest);
1.24 inline static void store (jint store_value, volatile jint* dest);
1.25 + // See comment above about using jlong atomics on 32-bit platforms
1.26 inline static void store (jlong store_value, volatile jlong* dest);
1.27 inline static void store_ptr(intptr_t store_value, volatile intptr_t* dest);
1.28 inline static void store_ptr(void* store_value, volatile void* dest);
1.29
1.30 + // See comment above about using jlong atomics on 32-bit platforms
1.31 inline static jlong load(volatile jlong* src);
1.32
1.33 // Atomically add to a location, return updated value
1.34 inline static jint add (jint add_value, volatile jint* dest);
1.35 inline static intptr_t add_ptr(intptr_t add_value, volatile intptr_t* dest);
1.36 inline static void* add_ptr(intptr_t add_value, volatile void* dest);
1.37 -
1.38 + // See comment above about using jlong atomics on 32-bit platforms
1.39 static jlong add (jlong add_value, volatile jlong* dest);
1.40
1.41 // Atomically increment location
1.42 @@ -75,6 +84,7 @@
1.43 // barrier across the cmpxchg. I.e., it's really a 'fence_cmpxchg_acquire'.
1.44 static jbyte cmpxchg (jbyte exchange_value, volatile jbyte* dest, jbyte compare_value);
1.45 inline static jint cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value);
1.46 + // See comment above about using jlong atomics on 32-bit platforms
1.47 inline static jlong cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value);
1.48
1.49 static unsigned int cmpxchg(unsigned int exchange_value,
