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