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1 /*
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2 * Copyright 1999-2003 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 class Atomic : AllStatic {
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26 public:
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27 // Atomically store to a location
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28 static void store (jbyte store_value, jbyte* dest);
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29 static void store (jshort store_value, jshort* dest);
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30 static void store (jint store_value, jint* dest);
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31 static void store (jlong store_value, jlong* dest);
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32 static void store_ptr(intptr_t store_value, intptr_t* dest);
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33 static void store_ptr(void* store_value, void* dest);
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34
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35 static void store (jbyte store_value, volatile jbyte* dest);
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36 static void store (jshort store_value, volatile jshort* dest);
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37 static void store (jint store_value, volatile jint* dest);
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38 static void store (jlong store_value, volatile jlong* dest);
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39 static void store_ptr(intptr_t store_value, volatile intptr_t* dest);
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40 static void store_ptr(void* store_value, volatile void* dest);
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41
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42 // Atomically add to a location, return updated value
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43 static jint add (jint add_value, volatile jint* dest);
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44 static intptr_t add_ptr(intptr_t add_value, volatile intptr_t* dest);
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45 static void* add_ptr(intptr_t add_value, volatile void* dest);
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46
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47 // Atomically increment location
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48 static void inc (volatile jint* dest);
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49 static void inc_ptr(volatile intptr_t* dest);
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50 static void inc_ptr(volatile void* dest);
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51
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52 // Atomically decrement a location
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53 static void dec (volatile jint* dest);
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54 static void dec_ptr(volatile intptr_t* dest);
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55 static void dec_ptr(volatile void* dest);
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56
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57 // Performs atomic exchange of *dest with exchange_value. Returns old prior value of *dest.
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58 static jint xchg (jint exchange_value, volatile jint* dest);
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59 static intptr_t xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest);
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60 static void* xchg_ptr(void* exchange_value, volatile void* dest);
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61
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62 // Performs atomic compare of *dest and compare_value, and exchanges *dest with exchange_value
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63 // if the comparison succeeded. Returns prior value of *dest. Guarantees a two-way memory
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64 // barrier across the cmpxchg. I.e., it's really a 'fence_cmpxchg_acquire'.
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65 static jbyte cmpxchg (jbyte exchange_value, volatile jbyte* dest, jbyte compare_value);
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66 static jint cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value);
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67 static jlong cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value);
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68 static intptr_t cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value);
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69 static void* cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value);
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70 };
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