VirtualBox

source: vbox/trunk/include/VBox/vmm/vmcpuset.h@ 55461

Last change on this file since 55461 was 53794, checked in by vboxsync, 10 years ago

vmcpuset.h: Added atomic add and del operations.

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File size: 4.4 KB
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1/** @file
2 * VirtualBox - VMCPUSET Operation.
3 */
4
5/*
6 * Copyright (C) 2006-2015 Oracle Corporation
7 *
8 * This file is part of VirtualBox Open Source Edition (OSE), as
9 * available from http://www.virtualbox.org. This file is free software;
10 * you can redistribute it and/or modify it under the terms of the GNU
11 * General Public License (GPL) as published by the Free Software
12 * Foundation, in version 2 as it comes in the "COPYING" file of the
13 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
14 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
15 *
16 * The contents of this file may alternatively be used under the terms
17 * of the Common Development and Distribution License Version 1.0
18 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
19 * VirtualBox OSE distribution, in which case the provisions of the
20 * CDDL are applicable instead of those of the GPL.
21 *
22 * You may elect to license modified versions of this file under the
23 * terms and conditions of either the GPL or the CDDL or both.
24 */
25
26#ifndef ___VBox_vmm_vmcpuset_h
27#define ___VBox_vmm_vmcpuset_h
28
29#include <VBox/types.h>
30#include <iprt/asm.h>
31#include <iprt/string.h>
32
33/** @defgroup grp_vmcpuset VMCPUSET Operations
34 * @ingroup grp_types_both
35 * @sa VMCPUSET
36 * @{
37 */
38
39/** Tests if a valid CPU ID is present in the set.. */
40#define VMCPUSET_IS_PRESENT(pSet, idCpu) ASMBitTest( &(pSet)->au32Bitmap[0], (idCpu))
41/** Adds a CPU to the set. */
42#define VMCPUSET_ADD(pSet, idCpu) ASMBitSet( &(pSet)->au32Bitmap[0], (idCpu))
43/** Deletes a CPU from the set. */
44#define VMCPUSET_DEL(pSet, idCpu) ASMBitClear(&(pSet)->au32Bitmap[0], (idCpu))
45/** Adds a CPU to the set, atomically. */
46#define VMCPUSET_ATOMIC_ADD(pSet, idCpu) ASMAtomicBitSet( &(pSet)->au32Bitmap[0], (idCpu))
47/** Deletes a CPU from the set, atomically. */
48#define VMCPUSET_ATOMIC_DEL(pSet, idCpu) ASMAtomicBitClear(&(pSet)->au32Bitmap[0], (idCpu))
49/** Empties the set. */
50#define VMCPUSET_EMPTY(pSet) memset(&(pSet)->au32Bitmap[0], '\0', sizeof((pSet)->au32Bitmap))
51/** Fills the set. */
52#define VMCPUSET_FILL(pSet) memset(&(pSet)->au32Bitmap[0], 0xff, sizeof((pSet)->au32Bitmap))
53/** Checks if two sets are equal to one another. */
54#define VMCPUSET_IS_EQUAL(pSet1, pSet2) (memcmp(&(pSet1)->au32Bitmap[0], &(pSet2)->au32Bitmap[0], sizeof((pSet1)->au32Bitmap)) == 0)
55/** Checks if the set is empty. */
56#define VMCPUSET_IS_EMPTY(a_pSet) ( (a_pSet)->au32Bitmap[0] == 0 \
57 && (a_pSet)->au32Bitmap[1] == 0 \
58 && (a_pSet)->au32Bitmap[2] == 0 \
59 && (a_pSet)->au32Bitmap[3] == 0 \
60 && (a_pSet)->au32Bitmap[4] == 0 \
61 && (a_pSet)->au32Bitmap[5] == 0 \
62 && (a_pSet)->au32Bitmap[6] == 0 \
63 && (a_pSet)->au32Bitmap[7] == 0 \
64 )
65/** Finds the first CPU present in the SET.
66 * @returns CPU index if found, NIL_VMCPUID if not. */
67#define VMCPUSET_FIND_FIRST_PRESENT(a_pSet) VMCpuSetFindFirstPresentInternal(a_pSet)
68
69/** Implements VMCPUSET_FIND_FIRST_PRESENT.
70 *
71 * @returns CPU index of the first CPU present in the set, NIL_VMCPUID if none
72 * are present.
73 * @param pSet The set to scan.
74 */
75DECLINLINE(int32_t) VMCpuSetFindFirstPresentInternal(PCVMCPUSET pSet)
76{
77 int i = ASMBitFirstSet(&pSet->au32Bitmap[0], RT_ELEMENTS(pSet->au32Bitmap) * 32);
78 return i >= 0 ? (VMCPUID)i : NIL_VMCPUID;
79}
80
81/** Finds the first CPU present in the SET.
82 * @returns CPU index if found, NIL_VMCPUID if not. */
83#define VMCPUSET_FIND_LAST_PRESENT(a_pSet) VMCpuSetFindLastPresentInternal(a_pSet)
84
85/** Implements VMCPUSET_FIND_LAST_PRESENT.
86 *
87 * @returns CPU index of the last CPU present in the set, NIL_VMCPUID if none
88 * are present.
89 * @param pSet The set to scan.
90 */
91DECLINLINE(int32_t) VMCpuSetFindLastPresentInternal(PCVMCPUSET pSet)
92{
93 uint32_t i = RT_ELEMENTS(pSet->au32Bitmap);
94 while (i-- > 0)
95 {
96 uint32_t u = pSet->au32Bitmap[i];
97 if (u)
98 {
99 u = ASMBitLastSetU32(u);
100 u--;
101 u |= i << 5;
102 return u;
103 }
104 }
105 return NIL_VMCPUID;
106}
107
108/** @} */
109
110#endif
111
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