--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/runtime/atomic.hpp Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,70 @@
+/*
+ * Copyright 1999-2003 Sun Microsystems, Inc. All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+class Atomic : AllStatic {
+ public:
+ // Atomically store to a location
+ static void store (jbyte store_value, jbyte* dest);
+ static void store (jshort store_value, jshort* dest);
+ static void store (jint store_value, jint* dest);
+ static void store (jlong store_value, jlong* dest);
+ static void store_ptr(intptr_t store_value, intptr_t* dest);
+ static void store_ptr(void* store_value, void* dest);
+
+ static void store (jbyte store_value, volatile jbyte* dest);
+ static void store (jshort store_value, volatile jshort* dest);
+ static void store (jint store_value, volatile jint* dest);
+ static void store (jlong store_value, volatile jlong* dest);
+ static void store_ptr(intptr_t store_value, volatile intptr_t* dest);
+ static void store_ptr(void* store_value, volatile void* dest);
+
+ // Atomically add to a location, return updated value
+ static jint add (jint add_value, volatile jint* dest);
+ static intptr_t add_ptr(intptr_t add_value, volatile intptr_t* dest);
+ static void* add_ptr(intptr_t add_value, volatile void* dest);
+
+ // Atomically increment location
+ static void inc (volatile jint* dest);
+ static void inc_ptr(volatile intptr_t* dest);
+ static void inc_ptr(volatile void* dest);
+
+ // Atomically decrement a location
+ static void dec (volatile jint* dest);
+ static void dec_ptr(volatile intptr_t* dest);
+ static void dec_ptr(volatile void* dest);
+
+ // Performs atomic exchange of *dest with exchange_value. Returns old prior value of *dest.
+ static jint xchg (jint exchange_value, volatile jint* dest);
+ static intptr_t xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest);
+ static void* xchg_ptr(void* exchange_value, volatile void* dest);
+
+ // Performs atomic compare of *dest and compare_value, and exchanges *dest with exchange_value
+ // if the comparison succeeded. Returns prior value of *dest. Guarantees a two-way memory
+ // 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);
+ static jint cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value);
+ static jlong cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value);
+ static intptr_t cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value);
+ static void* cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value);
+};