diff options
Diffstat (limited to 'src/share/vm/runtime/atomic.hpp')
| -rw-r--r-- | src/share/vm/runtime/atomic.hpp | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/src/share/vm/runtime/atomic.hpp b/src/share/vm/runtime/atomic.hpp index 0c96816d7..ae40def88 100644 --- a/src/share/vm/runtime/atomic.hpp +++ b/src/share/vm/runtime/atomic.hpp @@ -29,10 +29,17 @@ class Atomic : AllStatic { 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 + // be used from code that verifies they are available at runtime and + // can provide an alternative action if not - see supports_cx8() for + // a means to test availability. + // Atomically store to a location inline static void store (jbyte store_value, jbyte* dest); inline static void store (jshort store_value, jshort* dest); inline static void store (jint store_value, jint* dest); + // See comment above about using jlong atomics on 32-bit platforms inline static void store (jlong store_value, jlong* dest); inline static void store_ptr(intptr_t store_value, intptr_t* dest); inline static void store_ptr(void* store_value, void* dest); @@ -40,17 +47,19 @@ class Atomic : AllStatic { inline static void store (jbyte store_value, volatile jbyte* dest); inline static void store (jshort store_value, volatile jshort* dest); inline static void store (jint store_value, volatile jint* dest); + // See comment above about using jlong atomics on 32-bit platforms inline static void store (jlong store_value, volatile jlong* dest); inline static void store_ptr(intptr_t store_value, volatile intptr_t* dest); inline static void store_ptr(void* store_value, volatile void* dest); + // See comment above about using jlong atomics on 32-bit platforms inline static jlong load(volatile jlong* src); // Atomically add to a location, return updated value inline static jint add (jint add_value, volatile jint* dest); inline static intptr_t add_ptr(intptr_t add_value, volatile intptr_t* dest); inline static void* add_ptr(intptr_t add_value, volatile void* dest); - + // See comment above about using jlong atomics on 32-bit platforms static jlong add (jlong add_value, volatile jlong* dest); // Atomically increment location @@ -75,6 +84,7 @@ class Atomic : AllStatic { // barrier across the cmpxchg. I.e., it's really a 'fence_cmpxchg_acquire'. 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); static unsigned int cmpxchg(unsigned int exchange_value, |