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src/share/vm/runtime/atomic.cpp@a7509aff1b06 (annotated)

src/share/vm/runtime/atomic.cpp

Mon, 17 Sep 2012 07:36:31 -0400

author

dholmes

date

Mon, 17 Sep 2012 07:36:31 -0400

changeset 4077

a7509aff1b06

parent 3156

f08d439fab8c

child 4318

cd3d6a6b95d9

permissions

-rw-r--r--

7194254: jstack reports wrong thread priorities
Reviewed-by: dholmes, sla, fparain
Contributed-by: Dmytro Sheyko <dmytro_sheyko@hotmail.com>

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
stefank@2314	39	#ifdef TARGET_OS_ARCH_linux_x86
stefank@2314	40	# include "atomic_linux_x86.inline.hpp"
stefank@2314	41	#endif
stefank@2314	42	#ifdef TARGET_OS_ARCH_linux_sparc
stefank@2314	43	# include "atomic_linux_sparc.inline.hpp"
stefank@2314	44	#endif
stefank@2314	45	#ifdef TARGET_OS_ARCH_linux_zero
stefank@2314	46	# include "atomic_linux_zero.inline.hpp"
stefank@2314	47	#endif
stefank@2314	48	#ifdef TARGET_OS_ARCH_solaris_x86
stefank@2314	49	# include "atomic_solaris_x86.inline.hpp"
stefank@2314	50	#endif
stefank@2314	51	#ifdef TARGET_OS_ARCH_solaris_sparc
stefank@2314	52	# include "atomic_solaris_sparc.inline.hpp"
stefank@2314	53	#endif
stefank@2314	54	#ifdef TARGET_OS_ARCH_windows_x86
stefank@2314	55	# include "atomic_windows_x86.inline.hpp"
stefank@2314	56	#endif
jcoomes@2993	57	#ifdef TARGET_OS_ARCH_linux_arm
jcoomes@2993	58	# include "atomic_linux_arm.inline.hpp"
jcoomes@2993	59	#endif
jcoomes@2993	60	#ifdef TARGET_OS_ARCH_linux_ppc
jcoomes@2993	61	# include "atomic_linux_ppc.inline.hpp"
jcoomes@2993	62	#endif
never@3156	63	#ifdef TARGET_OS_ARCH_bsd_x86
never@3156	64	# include "atomic_bsd_x86.inline.hpp"
never@3156	65	#endif
never@3156	66	#ifdef TARGET_OS_ARCH_bsd_zero
never@3156	67	# include "atomic_bsd_zero.inline.hpp"
never@3156	68	#endif
duke@435	69
duke@435	70	jbyte Atomic::cmpxchg(jbyte exchange_value, volatile jbyte* dest, jbyte compare_value) {
duke@435	71	assert(sizeof(jbyte) == 1, "assumption.");
duke@435	72	uintptr_t dest_addr = (uintptr_t)dest;
duke@435	73	uintptr_t offset = dest_addr % sizeof(jint);
duke@435	74	volatile jint* dest_int = (volatile jint*)(dest_addr - offset);
duke@435	75	jint cur = *dest_int;
duke@435	76	jbyte* cur_as_bytes = (jbyte*)(&cur);
duke@435	77	jint new_val = cur;
duke@435	78	jbyte* new_val_as_bytes = (jbyte*)(&new_val);
duke@435	79	new_val_as_bytes[offset] = exchange_value;
duke@435	80	while (cur_as_bytes[offset] == compare_value) {
duke@435	81	jint res = cmpxchg(new_val, dest_int, cur);
duke@435	82	if (res == cur) break;
duke@435	83	cur = res;
duke@435	84	new_val = cur;
duke@435	85	new_val_as_bytes[offset] = exchange_value;
duke@435	86	}
duke@435	87	return cur_as_bytes[offset];
duke@435	88	}
coleenp@548	89
coleenp@548	90	unsigned Atomic::xchg(unsigned int exchange_value, volatile unsigned int* dest) {
coleenp@548	91	assert(sizeof(unsigned int) == sizeof(jint), "more work to do");
coleenp@548	92	return (unsigned int)Atomic::xchg((jint)exchange_value, (volatile jint*)dest);
coleenp@548	93	}
coleenp@548	94
coleenp@548	95	unsigned Atomic::cmpxchg(unsigned int exchange_value,
coleenp@548	96	volatile unsigned int* dest, unsigned int compare_value) {
coleenp@548	97	assert(sizeof(unsigned int) == sizeof(jint), "more work to do");
coleenp@548	98	return (unsigned int)Atomic::cmpxchg((jint)exchange_value, (volatile jint*)dest,
coleenp@548	99	(jint)compare_value);
coleenp@548	100	}
minqi@2964	101
minqi@2964	102	jlong Atomic::add(jlong add_value, volatile jlong* dest) {
minqi@2964	103	jlong old = load(dest);
minqi@2964	104	jlong new_value = old + add_value;
minqi@2964	105	while (old != cmpxchg(new_value, dest, old)) {
minqi@2964	106	old = load(dest);
minqi@2964	107	new_value = old + add_value;
minqi@2964	108	}
minqi@2964	109	return old;
minqi@2964	110	}