VirtualBox

source: vbox/trunk/src/VBox/Runtime/common/rand/rand.cpp@ 76452

Last change on this file since 76452 was 76452, checked in by vboxsync, 6 years ago

IPRT: Ran scm --fix-err-h. bugref:9344

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  • Property svn:keywords set to Id Revision
File size: 5.2 KB
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1/* $Id: rand.cpp 76452 2018-12-25 01:41:25Z vboxsync $ */
2/** @file
3 * IPRT - Random Numbers.
4 */
5
6/*
7 * Copyright (C) 2006-2017 Oracle Corporation
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 *
17 * The contents of this file may alternatively be used under the terms
18 * of the Common Development and Distribution License Version 1.0
19 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20 * VirtualBox OSE distribution, in which case the provisions of the
21 * CDDL are applicable instead of those of the GPL.
22 *
23 * You may elect to license modified versions of this file under the
24 * terms and conditions of either the GPL or the CDDL or both.
25 */
26
27
28/*********************************************************************************************************************************
29* Header Files *
30*********************************************************************************************************************************/
31#include <iprt/rand.h>
32#include "internal/iprt.h"
33
34#include <iprt/time.h>
35#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
36# include <iprt/asm-amd64-x86.h>
37#endif
38#include <iprt/errcore.h>
39#include <iprt/assert.h>
40#include <iprt/thread.h>
41#include <iprt/once.h>
42#include "internal/rand.h"
43
44
45/*********************************************************************************************************************************
46* Global Variables *
47*********************************************************************************************************************************/
48/** For lazily initializing of the random generator. */
49static RTONCE g_rtRandOnce = RTONCE_INITIALIZER;
50/** The default random generator. */
51static RTRAND g_hRand = NIL_RTRAND;
52
53
54/**
55 * Perform lazy initialization.
56 *
57 * @returns IPRT status code.
58 * @param pvUser Ignored.
59 */
60static DECLCALLBACK(int) rtRandInitOnce(void *pvUser)
61{
62 RTRAND hRand;
63 int rc = RTRandAdvCreateSystemFaster(&hRand);
64 if (RT_FAILURE(rc))
65 rc = RTRandAdvCreateParkMiller(&hRand);
66 if (RT_SUCCESS(rc))
67 {
68#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
69 RTRandAdvSeed(hRand, ASMReadTSC() >> 8);
70#else
71 RTRandAdvSeed(hRand, RTTimeNanoTS() >> 8);
72#endif
73 g_hRand = hRand;
74 }
75 else
76 AssertRC(rc);
77
78 NOREF(pvUser);
79 return rc;
80}
81
82
83/**
84 * Termination counterpart to rtRandInitOnce.
85 *
86 * @returns IPRT status code.
87 * @param pvUser Ignored.
88 * @param fLazyCleanUpOk Set if we're terminating the process.
89 */
90static DECLCALLBACK(void) rtRandTermOnce(void *pvUser, bool fLazyCleanUpOk)
91{
92 if (!fLazyCleanUpOk)
93 {
94 RTRAND hRand = g_hRand;
95 g_hRand = NIL_RTRAND;
96 if (hRand != NIL_RTRAND)
97 {
98 int rc = RTRandAdvDestroy(hRand);
99 AssertRC(rc);
100 }
101 }
102 NOREF(pvUser);
103}
104
105
106RTDECL(void) RTRandBytes(void *pv, size_t cb) RT_NO_THROW_DEF
107{
108 RTOnceEx(&g_rtRandOnce, rtRandInitOnce, rtRandTermOnce, NULL);
109 RTRandAdvBytes(g_hRand, pv, cb);
110}
111RT_EXPORT_SYMBOL(RTRandBytes);
112
113
114RTDECL(uint32_t) RTRandU32Ex(uint32_t u32First, uint32_t u32Last) RT_NO_THROW_DEF
115{
116 RTOnceEx(&g_rtRandOnce, rtRandInitOnce, rtRandTermOnce, NULL);
117 return RTRandAdvU32Ex(g_hRand, u32First, u32Last);
118}
119RT_EXPORT_SYMBOL(RTRandU32Ex);
120
121
122RTDECL(uint32_t) RTRandU32(void) RT_NO_THROW_DEF
123{
124 RTOnceEx(&g_rtRandOnce, rtRandInitOnce, rtRandTermOnce, NULL);
125 return RTRandAdvU32(g_hRand);
126}
127RT_EXPORT_SYMBOL(RTRandU32);
128
129
130RTDECL(int32_t) RTRandS32Ex(int32_t i32First, int32_t i32Last) RT_NO_THROW_DEF
131{
132 RTOnceEx(&g_rtRandOnce, rtRandInitOnce, rtRandTermOnce, NULL);
133 return RTRandAdvS32Ex(g_hRand, i32First, i32Last);
134}
135RT_EXPORT_SYMBOL(RTRandS32Ex);
136
137
138RTDECL(int32_t) RTRandS32(void) RT_NO_THROW_DEF
139{
140 RTOnceEx(&g_rtRandOnce, rtRandInitOnce, rtRandTermOnce, NULL);
141 return RTRandAdvS32(g_hRand);
142}
143RT_EXPORT_SYMBOL(RTRandS32);
144
145
146RTDECL(uint64_t) RTRandU64Ex(uint64_t u64First, uint64_t u64Last) RT_NO_THROW_DEF
147{
148 RTOnceEx(&g_rtRandOnce, rtRandInitOnce, rtRandTermOnce, NULL);
149 return RTRandAdvU64Ex(g_hRand, u64First, u64Last);
150}
151RT_EXPORT_SYMBOL(RTRandU64Ex);
152
153
154RTDECL(uint64_t) RTRandU64(void) RT_NO_THROW_DEF
155{
156 RTOnceEx(&g_rtRandOnce, rtRandInitOnce, rtRandTermOnce, NULL);
157 return RTRandAdvU64(g_hRand);
158}
159RT_EXPORT_SYMBOL(RTRandU64);
160
161
162RTDECL(int64_t) RTRandS64Ex(int64_t i64First, int64_t i64Last) RT_NO_THROW_DEF
163{
164 RTOnceEx(&g_rtRandOnce, rtRandInitOnce, rtRandTermOnce, NULL);
165 return RTRandAdvS64Ex(g_hRand, i64First, i64Last);
166}
167RT_EXPORT_SYMBOL(RTRandS64Ex);
168
169
170RTDECL(int64_t) RTRandS64(void) RT_NO_THROW_DEF
171{
172 RTOnceEx(&g_rtRandOnce, rtRandInitOnce, rtRandTermOnce, NULL);
173 return RTRandAdvS32(g_hRand);
174}
175RT_EXPORT_SYMBOL(RTRandS64);
176
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