1 /* 2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "runtime/atomic.hpp" 27 #ifdef TARGET_OS_FAMILY_linux 28 # include "os_linux.inline.hpp" 29 #endif 30 #ifdef TARGET_OS_FAMILY_solaris 31 # include "os_solaris.inline.hpp" 32 #endif 33 #ifdef TARGET_OS_FAMILY_windows 34 # include "os_windows.inline.hpp" 35 #endif 36 #ifdef TARGET_OS_ARCH_linux_x86 37 # include "atomic_linux_x86.inline.hpp" 38 #endif 39 #ifdef TARGET_OS_ARCH_linux_sparc 40 # include "atomic_linux_sparc.inline.hpp" 41 #endif 42 #ifdef TARGET_OS_ARCH_linux_zero 43 # include "atomic_linux_zero.inline.hpp" 44 #endif 45 #ifdef TARGET_OS_ARCH_solaris_x86 46 # include "atomic_solaris_x86.inline.hpp" 47 #endif 48 #ifdef TARGET_OS_ARCH_solaris_sparc 49 # include "atomic_solaris_sparc.inline.hpp" 50 #endif 51 #ifdef TARGET_OS_ARCH_windows_x86 52 # include "atomic_windows_x86.inline.hpp" 53 #endif 54 55 jbyte Atomic::cmpxchg(jbyte exchange_value, volatile jbyte* dest, jbyte compare_value) { 56 assert(sizeof(jbyte) == 1, "assumption."); 57 uintptr_t dest_addr = (uintptr_t)dest; 58 uintptr_t offset = dest_addr % sizeof(jint); 59 volatile jint* dest_int = (volatile jint*)(dest_addr - offset); 60 jint cur = *dest_int; 61 jbyte* cur_as_bytes = (jbyte*)(&cur); 62 jint new_val = cur; 63 jbyte* new_val_as_bytes = (jbyte*)(&new_val); 64 new_val_as_bytes[offset] = exchange_value; 65 while (cur_as_bytes[offset] == compare_value) { 66 jint res = cmpxchg(new_val, dest_int, cur); 67 if (res == cur) break; 68 cur = res; 69 new_val = cur; 70 new_val_as_bytes[offset] = exchange_value; 71 } 72 return cur_as_bytes[offset]; 73 } 74 75 unsigned Atomic::xchg(unsigned int exchange_value, volatile unsigned int* dest) { 76 assert(sizeof(unsigned int) == sizeof(jint), "more work to do"); 77 return (unsigned int)Atomic::xchg((jint)exchange_value, (volatile jint*)dest); 78 } 79 80 unsigned Atomic::cmpxchg(unsigned int exchange_value, 81 volatile unsigned int* dest, unsigned int compare_value) { 82 assert(sizeof(unsigned int) == sizeof(jint), "more work to do"); 83 return (unsigned int)Atomic::cmpxchg((jint)exchange_value, (volatile jint*)dest, 84 (jint)compare_value); 85 }