17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #ifndef OS_CPU_LINUX_ZERO_ATOMIC_LINUX_ZERO_HPP
27 #define OS_CPU_LINUX_ZERO_ATOMIC_LINUX_ZERO_HPP
28
29 #include "runtime/os.hpp"
30
31 // Implementation of class atomic
32
33 template<size_t byte_size>
34 struct Atomic::PlatformAdd
35 : Atomic::AddAndFetch<Atomic::PlatformAdd<byte_size> >
36 {
37 template<typename I, typename D>
38 D add_and_fetch(I add_value, D volatile* dest, atomic_memory_order order) const;
39 };
40
41 template<>
42 template<typename I, typename D>
43 inline D Atomic::PlatformAdd<4>::add_and_fetch(I add_value, D volatile* dest,
44 atomic_memory_order order) const {
45 STATIC_ASSERT(4 == sizeof(I));
46 STATIC_ASSERT(4 == sizeof(D));
47
48 return __sync_add_and_fetch(dest, add_value);
49 }
50
51 template<>
52 template<typename I, typename D>
53 inline D Atomic::PlatformAdd<8>::add_and_fetch(I add_value, D volatile* dest,
54 atomic_memory_order order) const {
55 STATIC_ASSERT(8 == sizeof(I));
56 STATIC_ASSERT(8 == sizeof(D));
57 return __sync_add_and_fetch(dest, add_value);
58 }
59
60 template<>
61 template<typename T>
62 inline T Atomic::PlatformXchg<4>::operator()(T exchange_value,
63 T volatile* dest,
64 atomic_memory_order order) const {
65 STATIC_ASSERT(4 == sizeof(T));
66 // __sync_lock_test_and_set is a bizarrely named atomic exchange
67 // operation. Note that some platforms only support this with the
68 // limitation that the only valid value to store is the immediate
69 // constant 1. There is a test for this in JNI_CreateJavaVM().
70 T result = __sync_lock_test_and_set (dest, exchange_value);
71 // All atomic operations are expected to be full memory barriers
72 // (see atomic.hpp). However, __sync_lock_test_and_set is not
73 // a full memory barrier, but an acquire barrier. Hence, this added
|
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #ifndef OS_CPU_LINUX_ZERO_ATOMIC_LINUX_ZERO_HPP
27 #define OS_CPU_LINUX_ZERO_ATOMIC_LINUX_ZERO_HPP
28
29 #include "runtime/os.hpp"
30
31 // Implementation of class atomic
32
33 template<size_t byte_size>
34 struct Atomic::PlatformAdd
35 : Atomic::AddAndFetch<Atomic::PlatformAdd<byte_size> >
36 {
37 template<typename D, typename I>
38 D add_and_fetch(D volatile* dest, I add_value, atomic_memory_order order) const;
39 };
40
41 template<>
42 template<typename D, typename I>
43 inline D Atomic::PlatformAdd<4>::add_and_fetch(D volatile* dest, I add_value,
44 atomic_memory_order order) const {
45 STATIC_ASSERT(4 == sizeof(I));
46 STATIC_ASSERT(4 == sizeof(D));
47
48 return __sync_add_and_fetch(dest, add_value);
49 }
50
51 template<>
52 template<typename D, typename I>
53 inline D Atomic::PlatformAdd<8>::add_and_fetch(D volatile* dest, I add_value,
54 atomic_memory_order order) const {
55 STATIC_ASSERT(8 == sizeof(I));
56 STATIC_ASSERT(8 == sizeof(D));
57 return __sync_add_and_fetch(dest, add_value);
58 }
59
60 template<>
61 template<typename T>
62 inline T Atomic::PlatformXchg<4>::operator()(T exchange_value,
63 T volatile* dest,
64 atomic_memory_order order) const {
65 STATIC_ASSERT(4 == sizeof(T));
66 // __sync_lock_test_and_set is a bizarrely named atomic exchange
67 // operation. Note that some platforms only support this with the
68 // limitation that the only valid value to store is the immediate
69 // constant 1. There is a test for this in JNI_CreateJavaVM().
70 T result = __sync_lock_test_and_set (dest, exchange_value);
71 // All atomic operations are expected to be full memory barriers
72 // (see atomic.hpp). However, __sync_lock_test_and_set is not
73 // a full memory barrier, but an acquire barrier. Hence, this added
|