VirtualBox

source: vbox/trunk/src/VBox/Runtime/r0drv/initterm-r0drv.cpp@ 57276

Last change on this file since 57276 was 56290, checked in by vboxsync, 10 years ago

IPRT: Updated (C) year.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id Revision
File size: 4.3 KB
Line 
1/* $Id: initterm-r0drv.cpp 56290 2015-06-09 14:01:31Z vboxsync $ */
2/** @file
3 * IPRT - Initialization & Termination, R0 Driver, Common.
4 */
5
6/*
7 * Copyright (C) 2006-2015 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/initterm.h>
32#include "internal/iprt.h"
33
34#include <iprt/asm.h>
35#include <iprt/assert.h>
36#include <iprt/err.h>
37#include <iprt/mp.h>
38#include <iprt/thread.h>
39#ifndef IN_GUEST /* play safe for now */
40# include "r0drv/mp-r0drv.h"
41# include "r0drv/power-r0drv.h"
42#endif
43
44#include "internal/initterm.h"
45#include "internal/thread.h"
46
47
48/*******************************************************************************
49* Global Variables *
50*******************************************************************************/
51/** Count of current IPRT users.
52 * In ring-0 several drivers / kmods / kexts / wossnames may share the
53 * same runtime code. So, we need to keep count in order not to terminate
54 * it prematurely. */
55static int32_t volatile g_crtR0Users = 0;
56
57
58/**
59 * Initializes the ring-0 driver runtime library.
60 *
61 * @returns iprt status code.
62 * @param fReserved Flags reserved for the future.
63 */
64RTR0DECL(int) RTR0Init(unsigned fReserved)
65{
66 int rc;
67 uint32_t cNewUsers;
68 Assert(fReserved == 0);
69#ifndef RT_OS_SOLARIS /* On Solaris our thread preemption information is only obtained in rtR0InitNative().*/
70 RT_ASSERT_PREEMPTIBLE();
71#endif
72
73 /*
74 * The first user initializes it.
75 * We rely on the module loader to ensure that there are no
76 * initialization races should two modules share the IPRT.
77 */
78 cNewUsers = ASMAtomicIncS32(&g_crtR0Users);
79 if (cNewUsers != 1)
80 {
81 if (cNewUsers > 1)
82 return VINF_SUCCESS;
83 ASMAtomicDecS32(&g_crtR0Users);
84 return VERR_INTERNAL_ERROR_3;
85 }
86
87 rc = rtR0InitNative();
88 if (RT_SUCCESS(rc))
89 {
90 rc = rtThreadInit();
91 if (RT_SUCCESS(rc))
92 {
93#ifndef IN_GUEST /* play safe for now */
94 rc = rtR0MpNotificationInit();
95 if (RT_SUCCESS(rc))
96 {
97 rc = rtR0PowerNotificationInit();
98 if (RT_SUCCESS(rc))
99 return rc;
100 rtR0MpNotificationTerm();
101 }
102#else
103 if (RT_SUCCESS(rc))
104 return rc;
105#endif
106 rtThreadTerm();
107 }
108 rtR0TermNative();
109 }
110 return rc;
111}
112RT_EXPORT_SYMBOL(RTR0Init);
113
114
115static void rtR0Term(void)
116{
117 rtThreadTerm();
118#ifndef IN_GUEST /* play safe for now */
119 rtR0PowerNotificationTerm();
120 rtR0MpNotificationTerm();
121#endif
122 rtR0TermNative();
123}
124
125
126/**
127 * Terminates the ring-0 driver runtime library.
128 */
129RTR0DECL(void) RTR0Term(void)
130{
131 int32_t cNewUsers;
132 RT_ASSERT_PREEMPTIBLE();
133
134 cNewUsers = ASMAtomicDecS32(&g_crtR0Users);
135 Assert(cNewUsers >= 0);
136 if (cNewUsers == 0)
137 rtR0Term();
138 else if (cNewUsers < 0)
139 ASMAtomicIncS32(&g_crtR0Users);
140}
141RT_EXPORT_SYMBOL(RTR0Term);
142
143
144/* Note! Should *not* be exported since it's only for static linking. */
145RTR0DECL(void) RTR0TermForced(void)
146{
147 RT_ASSERT_PREEMPTIBLE();
148
149 AssertMsg(g_crtR0Users == 1, ("%d\n", g_crtR0Users));
150 ASMAtomicWriteS32(&g_crtR0Users, 0);
151
152 rtR0Term();
153}
154
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