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src/share/vm/runtime/atomic.cpp@2a241e764894 (annotated)
src/share/vm/runtime/atomic.cpp
Fri, 10 Jun 2011 15:08:36 -0700
- author
- minqi
- date
- Fri, 10 Jun 2011 15:08:36 -0700
- changeset 2964
- 2a241e764894
- parent 2314
- f95d63e2154a
- child 2993
- 7d9e451f5416
- permissions
- -rw-r--r--
6941923: RFE: Handling large log files produced by long running Java Applications
Summary: supply optinal flags to realize gc log rotation
Reviewed-by: ysr, jwilhelm
| duke@435 | 1 | /* |
| stefank@2314 | 2 | * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
| duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| duke@435 | 4 | * |
| duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
| duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| duke@435 | 7 | * published by the Free Software Foundation. |
| duke@435 | 8 | * |
| duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| duke@435 | 13 | * accompanied this code). |
| duke@435 | 14 | * |
| duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
| duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| duke@435 | 18 | * |
| trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
| trims@1907 | 21 | * questions. |
| duke@435 | 22 | * |
| duke@435 | 23 | */ |
| duke@435 | 24 | |
| stefank@2314 | 25 | #include "precompiled.hpp" |
| stefank@2314 | 26 | #include "runtime/atomic.hpp" |
| stefank@2314 | 27 | #ifdef TARGET_OS_FAMILY_linux |
| stefank@2314 | 28 | # include "os_linux.inline.hpp" |
| stefank@2314 | 29 | #endif |
| stefank@2314 | 30 | #ifdef TARGET_OS_FAMILY_solaris |
| stefank@2314 | 31 | # include "os_solaris.inline.hpp" |
| stefank@2314 | 32 | #endif |
| stefank@2314 | 33 | #ifdef TARGET_OS_FAMILY_windows |
| stefank@2314 | 34 | # include "os_windows.inline.hpp" |
| stefank@2314 | 35 | #endif |
| stefank@2314 | 36 | #ifdef TARGET_OS_ARCH_linux_x86 |
| stefank@2314 | 37 | # include "atomic_linux_x86.inline.hpp" |
| stefank@2314 | 38 | #endif |
| stefank@2314 | 39 | #ifdef TARGET_OS_ARCH_linux_sparc |
| stefank@2314 | 40 | # include "atomic_linux_sparc.inline.hpp" |
| stefank@2314 | 41 | #endif |
| stefank@2314 | 42 | #ifdef TARGET_OS_ARCH_linux_zero |
| stefank@2314 | 43 | # include "atomic_linux_zero.inline.hpp" |
| stefank@2314 | 44 | #endif |
| stefank@2314 | 45 | #ifdef TARGET_OS_ARCH_solaris_x86 |
| stefank@2314 | 46 | # include "atomic_solaris_x86.inline.hpp" |
| stefank@2314 | 47 | #endif |
| stefank@2314 | 48 | #ifdef TARGET_OS_ARCH_solaris_sparc |
| stefank@2314 | 49 | # include "atomic_solaris_sparc.inline.hpp" |
| stefank@2314 | 50 | #endif |
| stefank@2314 | 51 | #ifdef TARGET_OS_ARCH_windows_x86 |
| stefank@2314 | 52 | # include "atomic_windows_x86.inline.hpp" |
| stefank@2314 | 53 | #endif |
| duke@435 | 54 | |
| duke@435 | 55 | jbyte Atomic::cmpxchg(jbyte exchange_value, volatile jbyte* dest, jbyte compare_value) { |
| duke@435 | 56 | assert(sizeof(jbyte) == 1, "assumption."); |
| duke@435 | 57 | uintptr_t dest_addr = (uintptr_t)dest; |
| duke@435 | 58 | uintptr_t offset = dest_addr % sizeof(jint); |
| duke@435 | 59 | volatile jint* dest_int = (volatile jint*)(dest_addr - offset); |
| duke@435 | 60 | jint cur = *dest_int; |
| duke@435 | 61 | jbyte* cur_as_bytes = (jbyte*)(&cur); |
| duke@435 | 62 | jint new_val = cur; |
| duke@435 | 63 | jbyte* new_val_as_bytes = (jbyte*)(&new_val); |
| duke@435 | 64 | new_val_as_bytes[offset] = exchange_value; |
| duke@435 | 65 | while (cur_as_bytes[offset] == compare_value) { |
| duke@435 | 66 | jint res = cmpxchg(new_val, dest_int, cur); |
| duke@435 | 67 | if (res == cur) break; |
| duke@435 | 68 | cur = res; |
| duke@435 | 69 | new_val = cur; |
| duke@435 | 70 | new_val_as_bytes[offset] = exchange_value; |
| duke@435 | 71 | } |
| duke@435 | 72 | return cur_as_bytes[offset]; |
| duke@435 | 73 | } |
| coleenp@548 | 74 | |
| coleenp@548 | 75 | unsigned Atomic::xchg(unsigned int exchange_value, volatile unsigned int* dest) { |
| coleenp@548 | 76 | assert(sizeof(unsigned int) == sizeof(jint), "more work to do"); |
| coleenp@548 | 77 | return (unsigned int)Atomic::xchg((jint)exchange_value, (volatile jint*)dest); |
| coleenp@548 | 78 | } |
| coleenp@548 | 79 | |
| coleenp@548 | 80 | unsigned Atomic::cmpxchg(unsigned int exchange_value, |
| coleenp@548 | 81 | volatile unsigned int* dest, unsigned int compare_value) { |
| coleenp@548 | 82 | assert(sizeof(unsigned int) == sizeof(jint), "more work to do"); |
| coleenp@548 | 83 | return (unsigned int)Atomic::cmpxchg((jint)exchange_value, (volatile jint*)dest, |
| coleenp@548 | 84 | (jint)compare_value); |
| coleenp@548 | 85 | } |
| minqi@2964 | 86 | |
| minqi@2964 | 87 | jlong Atomic::add(jlong add_value, volatile jlong* dest) { |
| minqi@2964 | 88 | jlong old = load(dest); |
| minqi@2964 | 89 | jlong new_value = old + add_value; |
| minqi@2964 | 90 | while (old != cmpxchg(new_value, dest, old)) { |
| minqi@2964 | 91 | old = load(dest); |
| minqi@2964 | 92 | new_value = old + add_value; |
| minqi@2964 | 93 | } |
| minqi@2964 | 94 | return old; |
| minqi@2964 | 95 | } |
