Mercurial > hg > truffle
diff src/share/vm/runtime/atomic.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | ba764ed4b6f2 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/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); +};