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src/share/vm/runtime/atomic.cpp@b5cb079ecaa4 (annotated)

src/share/vm/runtime/atomic.cpp

Sun, 03 Feb 2013 22:43:57 +0100

author

ewendeli

date

Sun, 03 Feb 2013 22:43:57 +0100

changeset 4703

b5cb079ecaa4

parent 4318

cd3d6a6b95d9

child 5306

d9eed26d638a

permissions

-rw-r--r--

Merge

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
never@3156	36	#ifdef TARGET_OS_FAMILY_bsd
never@3156	37	# include "os_bsd.inline.hpp"
never@3156	38	#endif
twisti@4318	39
twisti@4318	40	#include "runtime/atomic.inline.hpp"
duke@435	41
duke@435	42	jbyte Atomic::cmpxchg(jbyte exchange_value, volatile jbyte* dest, jbyte compare_value) {
duke@435	43	assert(sizeof(jbyte) == 1, "assumption.");
duke@435	44	uintptr_t dest_addr = (uintptr_t)dest;
duke@435	45	uintptr_t offset = dest_addr % sizeof(jint);
duke@435	46	volatile jint* dest_int = (volatile jint*)(dest_addr - offset);
duke@435	47	jint cur = *dest_int;
duke@435	48	jbyte* cur_as_bytes = (jbyte*)(&cur);
duke@435	49	jint new_val = cur;
duke@435	50	jbyte* new_val_as_bytes = (jbyte*)(&new_val);
duke@435	51	new_val_as_bytes[offset] = exchange_value;
duke@435	52	while (cur_as_bytes[offset] == compare_value) {
duke@435	53	jint res = cmpxchg(new_val, dest_int, cur);
duke@435	54	if (res == cur) break;
duke@435	55	cur = res;
duke@435	56	new_val = cur;
duke@435	57	new_val_as_bytes[offset] = exchange_value;
duke@435	58	}
duke@435	59	return cur_as_bytes[offset];
duke@435	60	}
coleenp@548	61
coleenp@548	62	unsigned Atomic::xchg(unsigned int exchange_value, volatile unsigned int* dest) {
coleenp@548	63	assert(sizeof(unsigned int) == sizeof(jint), "more work to do");
coleenp@548	64	return (unsigned int)Atomic::xchg((jint)exchange_value, (volatile jint*)dest);
coleenp@548	65	}
coleenp@548	66
coleenp@548	67	unsigned Atomic::cmpxchg(unsigned int exchange_value,
coleenp@548	68	volatile unsigned int* dest, unsigned int compare_value) {
coleenp@548	69	assert(sizeof(unsigned int) == sizeof(jint), "more work to do");
coleenp@548	70	return (unsigned int)Atomic::cmpxchg((jint)exchange_value, (volatile jint*)dest,
coleenp@548	71	(jint)compare_value);
coleenp@548	72	}
minqi@2964	73
minqi@2964	74	jlong Atomic::add(jlong add_value, volatile jlong* dest) {
minqi@2964	75	jlong old = load(dest);
minqi@2964	76	jlong new_value = old + add_value;
minqi@2964	77	while (old != cmpxchg(new_value, dest, old)) {
minqi@2964	78	old = load(dest);
minqi@2964	79	new_value = old + add_value;
minqi@2964	80	}
minqi@2964	81	return old;
minqi@2964	82	}