author | trims |
Thu, 27 May 2010 19:08:38 -0700 | |
changeset 5547 | f4b087cbb361 |
parent 4013 | b154310845de |
child 7397 | 5b173b4ca846 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2003, 2005, Oracle and/or its affiliates. All rights reserved. |
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* Copyright 2007, 2008 Red Hat, Inc. |
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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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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// Implementation of class atomic |
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#ifdef M68K |
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/* |
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* __m68k_cmpxchg |
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* |
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* Atomically store newval in *ptr if *ptr is equal to oldval for user space. |
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* Returns newval on success and oldval if no exchange happened. |
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* This implementation is processor specific and works on |
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* 68020 68030 68040 and 68060. |
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* |
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* It will not work on ColdFire, 68000 and 68010 since they lack the CAS |
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* instruction. |
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* Using a kernelhelper would be better for arch complete implementation. |
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* |
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*/ |
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static inline int __m68k_cmpxchg(int oldval, int newval, volatile int *ptr) { |
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int ret; |
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__asm __volatile ("cas%.l %0,%2,%1" |
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: "=d" (ret), "+m" (*(ptr)) |
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: "d" (newval), "0" (oldval)); |
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return ret; |
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} |
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/* Perform an atomic compare and swap: if the current value of `*PTR' |
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is OLDVAL, then write NEWVAL into `*PTR'. Return the contents of |
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`*PTR' before the operation.*/ |
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static inline int m68k_compare_and_swap(volatile int *ptr, |
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int oldval, |
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int newval) { |
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for (;;) { |
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int prev = *ptr; |
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if (prev != oldval) |
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return prev; |
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if (__m68k_cmpxchg (prev, newval, ptr) == newval) |
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// Success. |
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return prev; |
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// We failed even though prev == oldval. Try again. |
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} |
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} |
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/* Atomically add an int to memory. */ |
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static inline int m68k_add_and_fetch(volatile int *ptr, int add_value) { |
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for (;;) { |
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// Loop until success. |
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int prev = *ptr; |
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if (__m68k_cmpxchg (prev, prev + add_value, ptr) == prev + add_value) |
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return prev + add_value; |
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} |
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} |
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/* Atomically write VALUE into `*PTR' and returns the previous |
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contents of `*PTR'. */ |
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static inline int m68k_lock_test_and_set(volatile int *ptr, int newval) { |
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for (;;) { |
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// Loop until success. |
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int prev = *ptr; |
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if (__m68k_cmpxchg (prev, newval, ptr) == prev) |
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return prev; |
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} |
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} |
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#endif // M68K |
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#ifdef ARM |
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/* |
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* __kernel_cmpxchg |
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* |
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* Atomically store newval in *ptr if *ptr is equal to oldval for user space. |
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* Return zero if *ptr was changed or non-zero if no exchange happened. |
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* The C flag is also set if *ptr was changed to allow for assembly |
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* optimization in the calling code. |
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* |
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*/ |
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typedef int (__kernel_cmpxchg_t)(int oldval, int newval, volatile int *ptr); |
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#define __kernel_cmpxchg (*(__kernel_cmpxchg_t *) 0xffff0fc0) |
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/* Perform an atomic compare and swap: if the current value of `*PTR' |
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is OLDVAL, then write NEWVAL into `*PTR'. Return the contents of |
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`*PTR' before the operation.*/ |
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static inline int arm_compare_and_swap(volatile int *ptr, |
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int oldval, |
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int newval) { |
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for (;;) { |
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int prev = *ptr; |
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if (prev != oldval) |
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return prev; |
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if (__kernel_cmpxchg (prev, newval, ptr) == 0) |
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// Success. |
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return prev; |
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// We failed even though prev == oldval. Try again. |
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} |
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} |
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/* Atomically add an int to memory. */ |
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static inline int arm_add_and_fetch(volatile int *ptr, int add_value) { |
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for (;;) { |
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// Loop until a __kernel_cmpxchg succeeds. |
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int prev = *ptr; |
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if (__kernel_cmpxchg (prev, prev + add_value, ptr) == 0) |
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return prev + add_value; |
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} |
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} |
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/* Atomically write VALUE into `*PTR' and returns the previous |
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contents of `*PTR'. */ |
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static inline int arm_lock_test_and_set(volatile int *ptr, int newval) { |
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for (;;) { |
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// Loop until a __kernel_cmpxchg succeeds. |
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int prev = *ptr; |
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if (__kernel_cmpxchg (prev, newval, ptr) == 0) |
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return prev; |
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} |
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} |
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#endif // ARM |
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inline void Atomic::store(jint store_value, volatile jint* dest) { |
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*dest = store_value; |
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} |
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inline void Atomic::store_ptr(intptr_t store_value, intptr_t* dest) { |
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*dest = store_value; |
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} |
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inline jint Atomic::add(jint add_value, volatile jint* dest) { |
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#ifdef ARM |
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return arm_add_and_fetch(dest, add_value); |
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#else |
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#ifdef M68K |
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return m68k_add_and_fetch(dest, add_value); |
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#else |
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return __sync_add_and_fetch(dest, add_value); |
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#endif // M68K |
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#endif // ARM |
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} |
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inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) { |
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#ifdef ARM |
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return arm_add_and_fetch(dest, add_value); |
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#else |
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#ifdef M68K |
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return m68k_add_and_fetch(dest, add_value); |
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#else |
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return __sync_add_and_fetch(dest, add_value); |
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#endif // M68K |
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#endif // ARM |
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} |
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inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) { |
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return (void *) add_ptr(add_value, (volatile intptr_t *) dest); |
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} |
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inline void Atomic::inc(volatile jint* dest) { |
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add(1, dest); |
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} |
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inline void Atomic::inc_ptr(volatile intptr_t* dest) { |
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add_ptr(1, dest); |
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} |
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inline void Atomic::inc_ptr(volatile void* dest) { |
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add_ptr(1, dest); |
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} |
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inline void Atomic::dec(volatile jint* dest) { |
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add(-1, dest); |
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} |
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inline void Atomic::dec_ptr(volatile intptr_t* dest) { |
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add_ptr(-1, dest); |
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} |
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inline void Atomic::dec_ptr(volatile void* dest) { |
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add_ptr(-1, dest); |
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} |
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inline jint Atomic::xchg(jint exchange_value, volatile jint* dest) { |
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#ifdef ARM |
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return arm_lock_test_and_set(dest, exchange_value); |
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#else |
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#ifdef M68K |
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return m68k_lock_test_and_set(dest, exchange_value); |
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#else |
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// __sync_lock_test_and_set is a bizarrely named atomic exchange |
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// operation. Note that some platforms only support this with the |
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// limitation that the only valid value to store is the immediate |
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// constant 1. There is a test for this in JNI_CreateJavaVM(). |
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return __sync_lock_test_and_set (dest, exchange_value); |
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#endif // M68K |
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#endif // ARM |
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} |
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inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, |
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volatile intptr_t* dest) { |
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#ifdef ARM |
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return arm_lock_test_and_set(dest, exchange_value); |
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#else |
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#ifdef M68K |
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return m68k_lock_test_and_set(dest, exchange_value); |
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#else |
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return __sync_lock_test_and_set (dest, exchange_value); |
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#endif // M68K |
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#endif // ARM |
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} |
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inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) { |
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return (void *) xchg_ptr((intptr_t) exchange_value, |
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(volatile intptr_t*) dest); |
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} |
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inline jint Atomic::cmpxchg(jint exchange_value, |
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volatile jint* dest, |
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jint compare_value) { |
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#ifdef ARM |
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return arm_compare_and_swap(dest, compare_value, exchange_value); |
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#else |
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#ifdef M68K |
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return m68k_compare_and_swap(dest, compare_value, exchange_value); |
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#else |
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return __sync_val_compare_and_swap(dest, compare_value, exchange_value); |
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#endif // M68K |
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#endif // ARM |
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} |
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inline jlong Atomic::cmpxchg(jlong exchange_value, |
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volatile jlong* dest, |
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jlong compare_value) { |
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return __sync_val_compare_and_swap(dest, compare_value, exchange_value); |
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} |
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inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, |
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volatile intptr_t* dest, |
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intptr_t compare_value) { |
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#ifdef ARM |
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return arm_compare_and_swap(dest, compare_value, exchange_value); |
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#else |
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#ifdef M68K |
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return m68k_compare_and_swap(dest, compare_value, exchange_value); |
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#else |
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return __sync_val_compare_and_swap(dest, compare_value, exchange_value); |
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#endif // M68K |
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#endif // ARM |
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} |
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inline void* Atomic::cmpxchg_ptr(void* exchange_value, |
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volatile void* dest, |
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void* compare_value) { |
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return (void *) cmpxchg_ptr((intptr_t) exchange_value, |
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(volatile intptr_t*) dest, |
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(intptr_t) compare_value); |
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} |