jdk8-mips64-public/hotspot: src/share/vm/runtime/atomic.cpp@b92c45f2bc75

7016023: Enable building ARM and PPC from src/closed repository
Reviewed-by: dholmes, bdelsart

     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  */

    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

    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 }

    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 }

    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 }

Mercurial > jdk8-mips64-public > hotspot / file revision