[1] | 1 | /** @file
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[8245] | 2 | * IPRT - Critical Sections.
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[1] | 3 | */
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| 4 |
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| 5 | /*
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[76553] | 6 | * Copyright (C) 2006-2019 Oracle Corporation
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[1] | 7 | *
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| 8 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 9 | * available from http://www.virtualbox.org. This file is free software;
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| 10 | * you can redistribute it and/or modify it under the terms of the GNU
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[5999] | 11 | * General Public License (GPL) as published by the Free Software
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| 12 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 13 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 14 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 15 | *
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| 16 | * The contents of this file may alternatively be used under the terms
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| 17 | * of the Common Development and Distribution License Version 1.0
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| 18 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 19 | * VirtualBox OSE distribution, in which case the provisions of the
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| 20 | * CDDL are applicable instead of those of the GPL.
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| 21 | *
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| 22 | * You may elect to license modified versions of this file under the
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| 23 | * terms and conditions of either the GPL or the CDDL or both.
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[1] | 24 | */
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| 25 |
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[76557] | 26 | #ifndef IPRT_INCLUDED_critsect_h
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| 27 | #define IPRT_INCLUDED_critsect_h
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[76507] | 28 | #ifndef RT_WITHOUT_PRAGMA_ONCE
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| 29 | # pragma once
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| 30 | #endif
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[1] | 31 |
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| 32 | #include <iprt/cdefs.h>
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| 33 | #include <iprt/types.h>
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[25406] | 34 | #include <iprt/assert.h>
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[51942] | 35 | #if defined(IN_RING3) || defined(IN_RING0)
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[25406] | 36 | # include <iprt/thread.h>
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[1] | 37 | #endif
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[25748] | 38 | #ifdef RT_LOCK_STRICT_ORDER
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| 39 | # include <iprt/lockvalidator.h>
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| 40 | #endif
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[1] | 41 |
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[20374] | 42 | RT_C_DECLS_BEGIN
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[1] | 43 |
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| 44 | /** @defgroup grp_rt_critsect RTCritSect - Critical Sections
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[25167] | 45 | *
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[25168] | 46 | * "Critical section" synchronization primitives can be used to
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| 47 | * protect a section of code or data to which access must be exclusive;
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| 48 | * only one thread can hold access to a critical section at one time.
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[25167] | 49 | *
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[25168] | 50 | * A critical section is a fast recursive write lock; if the critical
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| 51 | * section is not acquired, then entering it is fast (requires no system
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| 52 | * call). IPRT uses the Windows terminology here; on other platform, this
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| 53 | * might be called a "futex" or a "fast mutex". As opposed to IPRT
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| 54 | * "fast mutexes" (see @ref grp_rt_sems_fast_mutex ), critical sections
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| 55 | * are recursive.
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[25167] | 56 | *
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| 57 | * Use RTCritSectInit to initialize a critical section; use RTCritSectEnter
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[25168] | 58 | * and RTCritSectLeave to acquire and release access.
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[25167] | 59 | *
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[25168] | 60 | * For an overview of all types of synchronization primitives provided
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| 61 | * by IPRT (event, mutex/fast mutex/read-write mutex semaphores), see
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| 62 | * @ref grp_rt_sems .
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[25167] | 63 | *
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[1] | 64 | * @ingroup grp_rt
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| 65 | * @{
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| 66 | */
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| 67 |
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| 68 | /**
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| 69 | * Critical section.
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| 70 | */
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| 71 | typedef struct RTCRITSECT
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| 72 | {
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| 73 | /** Magic used to validate the section state.
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| 74 | * RTCRITSECT_MAGIC is the value of an initialized & operational section. */
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[25368] | 75 | volatile uint32_t u32Magic;
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[1] | 76 | /** Number of lockers.
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| 77 | * -1 if the section is free. */
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[25368] | 78 | volatile int32_t cLockers;
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[1] | 79 | /** The owner thread. */
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[25368] | 80 | volatile RTNATIVETHREAD NativeThreadOwner;
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[1] | 81 | /** Number of nested enter operations performed.
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| 82 | * Greater or equal to 1 if owned, 0 when free.
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| 83 | */
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[25368] | 84 | volatile int32_t cNestings;
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[1] | 85 | /** Section flags - the RTCRITSECT_FLAGS_* \#defines. */
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[25368] | 86 | uint32_t fFlags;
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| 87 | /** The semaphore to block on. */
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| 88 | RTSEMEVENT EventSem;
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| 89 | /** Lock validator record. Only used in strict builds. */
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[25607] | 90 | R3R0PTRTYPE(PRTLOCKVALRECEXCL) pValidatorRec;
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[25368] | 91 | /** Alignmnet padding. */
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| 92 | RTHCPTR Alignment;
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[1] | 93 | } RTCRITSECT;
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[25368] | 94 | AssertCompileSize(RTCRITSECT, HC_ARCH_BITS == 32 ? 32 : 48);
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[1] | 95 |
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[25368] | 96 | /** RTCRITSECT::u32Magic value. (Hiromi Uehara) */
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| 97 | #define RTCRITSECT_MAGIC UINT32_C(0x19790326)
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[1] | 98 |
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[25707] | 99 | /** @name RTCritSectInitEx flags / RTCRITSECT::fFlags
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| 100 | * @{ */
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[1] | 101 | /** If set, nesting(/recursion) is not allowed. */
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[25368] | 102 | #define RTCRITSECT_FLAGS_NO_NESTING UINT32_C(0x00000001)
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[25685] | 103 | /** Disables lock validation. */
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| 104 | #define RTCRITSECT_FLAGS_NO_LOCK_VAL UINT32_C(0x00000002)
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[33269] | 105 | /** Bootstrap hack for use with certain memory allocator locks only! */
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| 106 | #define RTCRITSECT_FLAGS_BOOTSTRAP_HACK UINT32_C(0x00000004)
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[37419] | 107 | /** If set, the critical section becomes a dummy that doesn't serialize any
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| 108 | * threads. This flag can only be set at creation time.
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| 109 | *
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| 110 | * The intended use is avoiding lots of conditional code where some component
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| 111 | * might or might not require entering a critical section before access. */
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| 112 | #define RTCRITSECT_FLAGS_NOP UINT32_C(0x00000008)
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[51940] | 113 | /** Indicates that this is a ring-0 critical section. */
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| 114 | #define RTCRITSECT_FLAGS_RING0 UINT32_C(0x00000010)
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[25707] | 115 | /** @} */
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[1] | 116 |
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[45110] | 117 |
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[51940] | 118 | #if defined(IN_RING3) || defined(IN_RING0)
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[1] | 119 |
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| 120 | /**
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| 121 | * Initialize a critical section.
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| 122 | */
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| 123 | RTDECL(int) RTCritSectInit(PRTCRITSECT pCritSect);
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| 124 |
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| 125 | /**
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| 126 | * Initialize a critical section.
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| 127 | *
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| 128 | * @returns iprt status code.
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[45110] | 129 | * @param pCritSect Pointer to the critical section structure.
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| 130 | * @param fFlags Flags, any combination of the RTCRITSECT_FLAGS
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| 131 | * \#defines.
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| 132 | * @param hClass The class (no reference consumed). If NIL, no lock
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| 133 | * order validation will be performed on this lock.
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| 134 | * @param uSubClass The sub-class. This is used to define lock order
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| 135 | * within a class. RTLOCKVAL_SUB_CLASS_NONE is the
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| 136 | * recommended value here.
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| 137 | * @param pszNameFmt Name format string for the lock validator, optional
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| 138 | * (NULL). Max length is 32 bytes.
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| 139 | * @param ... Format string arguments.
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[1] | 140 | */
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[57004] | 141 | RTDECL(int) RTCritSectInitEx(PRTCRITSECT pCritSect, uint32_t fFlags, RTLOCKVALCLASS hClass, uint32_t uSubClass,
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| 142 | const char *pszNameFmt, ...) RT_IPRT_FORMAT_ATTR_MAYBE_NULL(5, 6);
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[1] | 143 |
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| 144 | /**
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[25704] | 145 | * Changes the lock validator sub-class of the critical section.
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| 146 | *
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| 147 | * It is recommended to try make sure that nobody is using this critical section
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| 148 | * while changing the value.
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| 149 | *
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| 150 | * @returns The old sub-class. RTLOCKVAL_SUB_CLASS_INVALID is returns if the
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| 151 | * lock validator isn't compiled in or either of the parameters are
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| 152 | * invalid.
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[45110] | 153 | * @param pCritSect The critical section.
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| 154 | * @param uSubClass The new sub-class value.
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[25704] | 155 | */
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| 156 | RTDECL(uint32_t) RTCritSectSetSubClass(PRTCRITSECT pCritSect, uint32_t uSubClass);
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| 157 |
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| 158 | /**
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[1] | 159 | * Enter a critical section.
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| 160 | *
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| 161 | * @returns VINF_SUCCESS on success.
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| 162 | * @returns VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
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[45151] | 163 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
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| 164 | * during the operation.
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[25685] | 165 | * @param pCritSect The critical section.
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[1] | 166 | */
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| 167 | RTDECL(int) RTCritSectEnter(PRTCRITSECT pCritSect);
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| 168 |
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| 169 | /**
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| 170 | * Enter a critical section.
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| 171 | *
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[45151] | 172 | * @returns IPRT status code.
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[25368] | 173 | * @retval VINF_SUCCESS on success.
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| 174 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
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[45151] | 175 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
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| 176 | * during the operation.
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[25368] | 177 | *
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| 178 | * @param pCritSect The critical section.
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| 179 | * @param uId Where we're entering the section.
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[57926] | 180 | * @param SRC_POS The source position where call is being made from.
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| 181 | * Use RT_SRC_POS when possible. Optional.
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[1] | 182 | */
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[25368] | 183 | RTDECL(int) RTCritSectEnterDebug(PRTCRITSECT pCritSect, RTHCUINTPTR uId, RT_SRC_POS_DECL);
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[1] | 184 |
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| 185 | /**
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| 186 | * Try enter a critical section.
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| 187 | *
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[25368] | 188 | * @retval VINF_SUCCESS on success.
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| 189 | * @retval VERR_SEM_BUSY if the critsect was owned.
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| 190 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
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[45151] | 191 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
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| 192 | * during the operation.
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[25368] | 193 | *
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[1] | 194 | * @param pCritSect The critical section.
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| 195 | */
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| 196 | RTDECL(int) RTCritSectTryEnter(PRTCRITSECT pCritSect);
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| 197 |
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| 198 | /**
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| 199 | * Try enter a critical section.
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| 200 | *
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[25368] | 201 | * @retval VINF_SUCCESS on success.
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| 202 | * @retval VERR_SEM_BUSY if the critsect was owned.
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| 203 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
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[45151] | 204 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
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| 205 | * during the operation.
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[25368] | 206 | *
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| 207 | * @param pCritSect The critical section.
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| 208 | * @param uId Where we're entering the section.
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[57926] | 209 | * @param SRC_POS The source position where call is being made from.
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| 210 | * Use RT_SRC_POS when possible. Optional.
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[1] | 211 | */
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[25368] | 212 | RTDECL(int) RTCritSectTryEnterDebug(PRTCRITSECT pCritSect, RTHCUINTPTR uId, RT_SRC_POS_DECL);
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[1] | 213 |
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[56402] | 214 | # ifdef IN_RING3 /* Crazy APIs: ring-3 only. */
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[51940] | 215 |
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[1] | 216 | /**
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| 217 | * Enter multiple critical sections.
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| 218 | *
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| 219 | * This function will enter ALL the specified critical sections before returning.
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| 220 | *
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| 221 | * @returns VINF_SUCCESS on success.
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| 222 | * @returns VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
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[45151] | 223 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
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| 224 | * during the operation.
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[1] | 225 | * @param cCritSects Number of critical sections in the array.
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| 226 | * @param papCritSects Array of critical section pointers.
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| 227 | *
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| 228 | * @remark Please note that this function will not necessarily come out favourable in a
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| 229 | * fight with other threads which are using the normal RTCritSectEnter() function.
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| 230 | * Therefore, avoid having to enter multiple critical sections!
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| 231 | */
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[25368] | 232 | RTDECL(int) RTCritSectEnterMultiple(size_t cCritSects, PRTCRITSECT *papCritSects);
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[1] | 233 |
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| 234 | /**
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| 235 | * Enter multiple critical sections.
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| 236 | *
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| 237 | * This function will enter ALL the specified critical sections before returning.
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| 238 | *
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| 239 | * @returns VINF_SUCCESS on success.
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| 240 | * @returns VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
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[45151] | 241 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
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| 242 | * during the operation.
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[1] | 243 | *
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| 244 | * @param cCritSects Number of critical sections in the array.
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| 245 | * @param papCritSects Array of critical section pointers.
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| 246 | * @param uId Where we're entering the section.
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[57926] | 247 | * @param SRC_POS The source position where call is being made from.
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| 248 | * Use RT_SRC_POS when possible. Optional.
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[1] | 249 | *
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| 250 | * @remark See RTCritSectEnterMultiple().
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| 251 | */
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[74373] | 252 | RTDECL(int) RTCritSectEnterMultipleDebug(size_t cCritSects, PRTCRITSECT *papCritSects, RTHCUINTPTR uId, RT_SRC_POS_DECL);
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[1] | 253 |
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[56402] | 254 | # endif /* IN_RING3 */
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[51940] | 255 |
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[1] | 256 | /**
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| 257 | * Leave a critical section.
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| 258 | *
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| 259 | * @returns VINF_SUCCESS.
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[45110] | 260 | * @param pCritSect The critical section.
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[1] | 261 | */
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| 262 | RTDECL(int) RTCritSectLeave(PRTCRITSECT pCritSect);
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| 263 |
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| 264 | /**
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| 265 | * Leave multiple critical sections.
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| 266 | *
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| 267 | * @returns VINF_SUCCESS.
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| 268 | * @param cCritSects Number of critical sections in the array.
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| 269 | * @param papCritSects Array of critical section pointers.
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| 270 | */
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[25368] | 271 | RTDECL(int) RTCritSectLeaveMultiple(size_t cCritSects, PRTCRITSECT *papCritSects);
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[1] | 272 |
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| 273 | /**
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| 274 | * Deletes a critical section.
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| 275 | *
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| 276 | * @returns VINF_SUCCESS.
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[45110] | 277 | * @param pCritSect The critical section.
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[1] | 278 | */
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| 279 | RTDECL(int) RTCritSectDelete(PRTCRITSECT pCritSect);
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| 280 |
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| 281 | /**
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| 282 | * Checks the caller is the owner of the critical section.
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| 283 | *
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| 284 | * @returns true if owner.
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| 285 | * @returns false if not owner.
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[45110] | 286 | * @param pCritSect The critical section.
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[1] | 287 | */
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| 288 | DECLINLINE(bool) RTCritSectIsOwner(PCRTCRITSECT pCritSect)
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| 289 | {
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| 290 | return pCritSect->NativeThreadOwner == RTThreadNativeSelf();
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| 291 | }
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| 292 |
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[51940] | 293 | #endif /* IN_RING3 || IN_RING0 */
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[1] | 294 |
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| 295 | /**
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| 296 | * Checks the section is owned by anyone.
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| 297 | *
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| 298 | * @returns true if owned.
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| 299 | * @returns false if not owned.
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[45110] | 300 | * @param pCritSect The critical section.
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[1] | 301 | */
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| 302 | DECLINLINE(bool) RTCritSectIsOwned(PCRTCRITSECT pCritSect)
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| 303 | {
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| 304 | return pCritSect->NativeThreadOwner != NIL_RTNATIVETHREAD;
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| 305 | }
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| 306 |
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| 307 | /**
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| 308 | * Gets the thread id of the critical section owner.
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| 309 | *
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| 310 | * @returns Thread id of the owner thread if owned.
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| 311 | * @returns NIL_RTNATIVETHREAD is not owned.
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[45110] | 312 | * @param pCritSect The critical section.
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[1] | 313 | */
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| 314 | DECLINLINE(RTNATIVETHREAD) RTCritSectGetOwner(PCRTCRITSECT pCritSect)
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| 315 | {
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| 316 | return pCritSect->NativeThreadOwner;
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| 317 | }
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| 318 |
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[20008] | 319 | /**
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| 320 | * Checks if a critical section is initialized or not.
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| 321 | *
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| 322 | * @returns true if initialized.
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| 323 | * @returns false if not initialized.
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[45110] | 324 | * @param pCritSect The critical section.
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[20008] | 325 | */
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| 326 | DECLINLINE(bool) RTCritSectIsInitialized(PCRTCRITSECT pCritSect)
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| 327 | {
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| 328 | return pCritSect->u32Magic == RTCRITSECT_MAGIC;
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| 329 | }
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[1] | 330 |
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| 331 | /**
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| 332 | * Gets the recursion depth.
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| 333 | *
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| 334 | * @returns The recursion depth.
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| 335 | * @param pCritSect The Critical section
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| 336 | */
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| 337 | DECLINLINE(uint32_t) RTCritSectGetRecursion(PCRTCRITSECT pCritSect)
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| 338 | {
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| 339 | return pCritSect->cNestings;
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| 340 | }
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| 341 |
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[19531] | 342 | /**
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| 343 | * Gets the waiter count
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| 344 | *
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| 345 | * @returns The waiter count
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| 346 | * @param pCritSect The Critical section
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| 347 | */
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[19568] | 348 | DECLINLINE(int32_t) RTCritSectGetWaiters(PCRTCRITSECT pCritSect)
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[19531] | 349 | {
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| 350 | return pCritSect->cLockers;
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| 351 | }
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| 352 |
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[25748] | 353 | /* Lock strict build: Remap the three enter calls to the debug versions. */
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[36492] | 354 | #if defined(RT_LOCK_STRICT) && !defined(RTCRITSECT_WITHOUT_REMAPPING) && !defined(RT_WITH_MANGLING)
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[76557] | 355 | # ifdef IPRT_INCLUDED_asm_h
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[25368] | 356 | # define RTCritSectEnter(pCritSect) RTCritSectEnterDebug(pCritSect, (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
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| 357 | # define RTCritSectTryEnter(pCritSect) RTCritSectTryEnterDebug(pCritSect, (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
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| 358 | # define RTCritSectEnterMultiple(cCritSects, pCritSect) RTCritSectEnterMultipleDebug((cCritSects), (pCritSect), (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
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| 359 | # else
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| 360 | # define RTCritSectEnter(pCritSect) RTCritSectEnterDebug(pCritSect, 0, RT_SRC_POS)
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| 361 | # define RTCritSectTryEnter(pCritSect) RTCritSectTryEnterDebug(pCritSect, 0, RT_SRC_POS)
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| 362 | # define RTCritSectEnterMultiple(cCritSects, pCritSect) RTCritSectEnterMultipleDebug((cCritSects), (pCritSect), 0, RT_SRC_POS)
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| 363 | # endif
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| 364 | #endif
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| 365 |
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[25748] | 366 | /* Strict lock order: Automatically classify locks by init location. */
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[45110] | 367 | #if defined(RT_LOCK_STRICT_ORDER) && defined(IN_RING3) && !defined(RTCRITSECT_WITHOUT_REMAPPING) && !defined(RT_WITH_MANGLING)
|
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[25748] | 368 | # define RTCritSectInit(pCritSect) \
|
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| 369 | RTCritSectInitEx((pCritSect), 0 /*fFlags*/, \
|
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| 370 | RTLockValidatorClassForSrcPos(RT_SRC_POS, NULL), \
|
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| 371 | RTLOCKVAL_SUB_CLASS_NONE, NULL)
|
---|
| 372 | #endif
|
---|
| 373 |
|
---|
[45110] | 374 | /** @} */
|
---|
| 375 |
|
---|
| 376 |
|
---|
| 377 |
|
---|
| 378 | /** @defgroup grp_rt_critsectrw RTCritSectRw - Read/Write Critical Sections
|
---|
| 379 | * @ingroup grp_rt
|
---|
| 380 | * @{
|
---|
| 381 | */
|
---|
| 382 |
|
---|
| 383 | /**
|
---|
| 384 | * Read/write critical section.
|
---|
| 385 | */
|
---|
| 386 | typedef struct RTCRITSECTRW
|
---|
| 387 | {
|
---|
| 388 | /** Magic used to validate the section state.
|
---|
| 389 | * RTCRITSECTRW_MAGIC is the value of an initialized & operational section. */
|
---|
| 390 | volatile uint32_t u32Magic;
|
---|
| 391 |
|
---|
| 392 | /** Indicates whether hEvtRead needs resetting. */
|
---|
| 393 | bool volatile fNeedReset;
|
---|
| 394 | /** Explicit alignment padding. */
|
---|
| 395 | bool volatile afPadding[1];
|
---|
| 396 | /** Section flags - the RTCRITSECT_FLAGS_* \#defines. */
|
---|
| 397 | uint16_t fFlags;
|
---|
| 398 |
|
---|
| 399 | /** The state variable.
|
---|
| 400 | * All accesses are atomic and it bits are defined like this:
|
---|
| 401 | * Bits 0..14 - cReads.
|
---|
| 402 | * Bit 15 - Unused.
|
---|
| 403 | * Bits 16..31 - cWrites. - doesn't make sense here
|
---|
| 404 | * Bit 31 - fDirection; 0=Read, 1=Write.
|
---|
| 405 | * Bits 32..46 - cWaitingReads
|
---|
| 406 | * Bit 47 - Unused.
|
---|
| 407 | * Bits 48..62 - cWaitingWrites
|
---|
| 408 | * Bit 63 - Unused.
|
---|
| 409 | */
|
---|
| 410 | uint64_t volatile u64State;
|
---|
| 411 | /** The write owner. */
|
---|
| 412 | RTNATIVETHREAD volatile hNativeWriter;
|
---|
| 413 | /** The number of reads made by the current writer. */
|
---|
| 414 | uint32_t volatile cWriterReads;
|
---|
| 415 | /** The number of recursions made by the current writer. (The initial grabbing
|
---|
| 416 | * of the lock counts as the first one.) */
|
---|
| 417 | uint32_t volatile cWriteRecursions;
|
---|
| 418 |
|
---|
| 419 | /** What the writer threads are blocking on. */
|
---|
| 420 | RTSEMEVENT hEvtWrite;
|
---|
| 421 | /** What the read threads are blocking on when waiting for the writer to
|
---|
| 422 | * finish. */
|
---|
| 423 | RTSEMEVENTMULTI hEvtRead;
|
---|
| 424 |
|
---|
| 425 | /** The validator record for the writer. */
|
---|
| 426 | R3R0PTRTYPE(PRTLOCKVALRECEXCL) pValidatorWrite;
|
---|
| 427 | /** The validator record for the readers. */
|
---|
| 428 | R3R0PTRTYPE(PRTLOCKVALRECSHRD) pValidatorRead;
|
---|
| 429 | #if HC_ARCH_BITS == 32
|
---|
| 430 | /** Size padding. */
|
---|
| 431 | RTHCPTR HCPtrPadding;
|
---|
| 432 | #endif
|
---|
| 433 | } RTCRITSECTRW;
|
---|
| 434 | AssertCompileSize(RTCRITSECTRW, HC_ARCH_BITS == 32 ? 48 : 64);
|
---|
| 435 |
|
---|
| 436 | /** RTCRITSECTRW::u32Magic value. (Eric Allan Dolphy, Jr.) */
|
---|
| 437 | #define RTCRITSECTRW_MAGIC UINT32_C(0x19280620)
|
---|
| 438 | /** RTCRITSECTRW::u32Magic dead value. */
|
---|
| 439 | #define RTCRITSECTRW_MAGIC_DEAD UINT32_C(0x19640629)
|
---|
| 440 |
|
---|
[45151] | 441 | /** @name RTCRITSECTRW::u64State values.
|
---|
| 442 | * @note Using RTCSRW instead of RTCRITSECTRW to save space.
|
---|
| 443 | * @{ */
|
---|
| 444 | #define RTCSRW_CNT_BITS 15
|
---|
| 445 | #define RTCSRW_CNT_MASK UINT64_C(0x00007fff)
|
---|
[45110] | 446 |
|
---|
[45151] | 447 | #define RTCSRW_CNT_RD_SHIFT 0
|
---|
| 448 | #define RTCSRW_CNT_RD_MASK (RTCSRW_CNT_MASK << RTCSRW_CNT_RD_SHIFT)
|
---|
| 449 | #define RTCSRW_CNT_WR_SHIFT 16
|
---|
| 450 | #define RTCSRW_CNT_WR_MASK (RTCSRW_CNT_MASK << RTCSRW_CNT_WR_SHIFT)
|
---|
| 451 |
|
---|
| 452 | #define RTCSRW_DIR_SHIFT 31
|
---|
| 453 | #define RTCSRW_DIR_MASK RT_BIT_64(RTCSRW_DIR_SHIFT)
|
---|
| 454 | #define RTCSRW_DIR_READ UINT64_C(0)
|
---|
| 455 | #define RTCSRW_DIR_WRITE UINT64_C(1)
|
---|
| 456 |
|
---|
| 457 | #define RTCSRW_WAIT_CNT_RD_SHIFT 32
|
---|
| 458 | #define RTCSRW_WAIT_CNT_RD_MASK (RTCSRW_CNT_MASK << RTCSRW_WAIT_CNT_RD_SHIFT)
|
---|
| 459 | /* #define RTCSRW_WAIT_CNT_WR_SHIFT 48 */
|
---|
| 460 | /* #define RTCSRW_WAIT_CNT_WR_MASK (RTCSRW_CNT_MASK << RTCSRW_WAIT_CNT_WR_SHIFT) */
|
---|
| 461 | /** @} */
|
---|
| 462 |
|
---|
[51940] | 463 | #if defined(IN_RING3) || defined(IN_RING0)
|
---|
[45110] | 464 |
|
---|
| 465 | /**
|
---|
| 466 | * Initialize a critical section.
|
---|
| 467 | */
|
---|
[45151] | 468 | RTDECL(int) RTCritSectRwInit(PRTCRITSECTRW pThis);
|
---|
[45110] | 469 |
|
---|
| 470 | /**
|
---|
| 471 | * Initialize a critical section.
|
---|
| 472 | *
|
---|
[45151] | 473 | * @returns IPRT status code.
|
---|
| 474 | * @param pThis Pointer to the read/write critical section.
|
---|
[45110] | 475 | * @param fFlags Flags, any combination of the RTCRITSECT_FLAGS
|
---|
| 476 | * \#defines.
|
---|
| 477 | * @param hClass The class (no reference consumed). If NIL, no lock
|
---|
| 478 | * order validation will be performed on this lock.
|
---|
| 479 | * @param uSubClass The sub-class. This is used to define lock order
|
---|
| 480 | * within a class. RTLOCKVAL_SUB_CLASS_NONE is the
|
---|
| 481 | * recommended value here.
|
---|
| 482 | * @param pszNameFmt Name format string for the lock validator, optional
|
---|
| 483 | * (NULL). Max length is 32 bytes.
|
---|
| 484 | * @param ... Format string arguments.
|
---|
| 485 | */
|
---|
[57004] | 486 | RTDECL(int) RTCritSectRwInitEx(PRTCRITSECTRW pThis, uint32_t fFlags, RTLOCKVALCLASS hClass, uint32_t uSubClass,
|
---|
| 487 | const char *pszNameFmt, ...) RT_IPRT_FORMAT_ATTR_MAYBE_NULL(5, 6);
|
---|
[45110] | 488 |
|
---|
| 489 | /**
|
---|
| 490 | * Changes the lock validator sub-class of the critical section.
|
---|
| 491 | *
|
---|
| 492 | * It is recommended to try make sure that nobody is using this critical section
|
---|
| 493 | * while changing the value.
|
---|
| 494 | *
|
---|
| 495 | * @returns The old sub-class. RTLOCKVAL_SUB_CLASS_INVALID is returns if the
|
---|
| 496 | * lock validator isn't compiled in or either of the parameters are
|
---|
| 497 | * invalid.
|
---|
[45151] | 498 | * @param pThis Pointer to the read/write critical section.
|
---|
[45110] | 499 | * @param uSubClass The new sub-class value.
|
---|
| 500 | */
|
---|
[45151] | 501 | RTDECL(uint32_t) RTCritSectRwSetSubClass(PRTCRITSECTRW pThis, uint32_t uSubClass);
|
---|
[45110] | 502 |
|
---|
| 503 |
|
---|
| 504 | /**
|
---|
| 505 | * Enter a critical section with shared (read) access.
|
---|
| 506 | *
|
---|
[45151] | 507 | * @returns IPRT status code.
|
---|
| 508 | * @retval VINF_SUCCESS on success.
|
---|
| 509 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
|
---|
| 510 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
|
---|
| 511 | * during the operation.
|
---|
| 512 | * @param pThis Pointer to the read/write critical section.
|
---|
[45110] | 513 | */
|
---|
[45151] | 514 | RTDECL(int) RTCritSectRwEnterShared(PRTCRITSECTRW pThis);
|
---|
[45110] | 515 |
|
---|
| 516 | /**
|
---|
| 517 | * Enter a critical section with shared (read) access.
|
---|
| 518 | *
|
---|
[45151] | 519 | * @returns IPRT status code.
|
---|
[45110] | 520 | * @retval VINF_SUCCESS on success.
|
---|
| 521 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
|
---|
[45151] | 522 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
|
---|
| 523 | * during the operation.
|
---|
[45110] | 524 | *
|
---|
[45151] | 525 | * @param pThis Pointer to the read/write critical section.
|
---|
[45110] | 526 | * @param uId Where we're entering the section.
|
---|
[57926] | 527 | * @param SRC_POS The source position where call is being made from.
|
---|
| 528 | * Use RT_SRC_POS when possible. Optional.
|
---|
[45110] | 529 | */
|
---|
[45151] | 530 | RTDECL(int) RTCritSectRwEnterSharedDebug(PRTCRITSECTRW pThis, RTHCUINTPTR uId, RT_SRC_POS_DECL);
|
---|
[45110] | 531 |
|
---|
| 532 | /**
|
---|
| 533 | * Try enter a critical section with shared (read) access.
|
---|
| 534 | *
|
---|
[45151] | 535 | * @returns IPRT status code.
|
---|
[45110] | 536 | * @retval VINF_SUCCESS on success.
|
---|
| 537 | * @retval VERR_SEM_BUSY if the critsect was owned.
|
---|
| 538 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
|
---|
[45151] | 539 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
|
---|
| 540 | * during the operation.
|
---|
[45110] | 541 | *
|
---|
[45151] | 542 | * @param pThis Pointer to the read/write critical section.
|
---|
[45110] | 543 | */
|
---|
[45151] | 544 | RTDECL(int) RTCritSectRwTryEnterShared(PRTCRITSECTRW pThis);
|
---|
[45110] | 545 |
|
---|
| 546 | /**
|
---|
| 547 | * Try enter a critical section with shared (read) access.
|
---|
| 548 | *
|
---|
[45151] | 549 | * @returns IPRT status code.
|
---|
[45110] | 550 | * @retval VINF_SUCCESS on success.
|
---|
| 551 | * @retval VERR_SEM_BUSY if the critsect was owned.
|
---|
| 552 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
|
---|
[45151] | 553 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
|
---|
| 554 | * during the operation.
|
---|
[45110] | 555 | *
|
---|
[45151] | 556 | * @param pThis Pointer to the read/write critical section.
|
---|
[45110] | 557 | * @param uId Where we're entering the section.
|
---|
[57926] | 558 | * @param SRC_POS The source position where call is being made from.
|
---|
| 559 | * Use RT_SRC_POS when possible. Optional.
|
---|
[45110] | 560 | */
|
---|
[45151] | 561 | RTDECL(int) RTCritSectRwTryEnterSharedDebug(PRTCRITSECTRW pThis, RTHCUINTPTR uId, RT_SRC_POS_DECL);
|
---|
[45110] | 562 |
|
---|
| 563 | /**
|
---|
| 564 | * Leave a critical section held with shared access.
|
---|
| 565 | *
|
---|
[45151] | 566 | * @returns IPRT status code.
|
---|
| 567 | * @param pThis Pointer to the read/write critical section.
|
---|
[45110] | 568 | */
|
---|
[45151] | 569 | RTDECL(int) RTCritSectRwLeaveShared(PRTCRITSECTRW pThis);
|
---|
[45110] | 570 |
|
---|
| 571 |
|
---|
| 572 | /**
|
---|
| 573 | * Enter a critical section with exclusive (write) access.
|
---|
| 574 | *
|
---|
[45151] | 575 | * @returns IPRT status code.
|
---|
| 576 | * @retval VINF_SUCCESS on success.
|
---|
| 577 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
|
---|
| 578 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
|
---|
| 579 | * during the operation.
|
---|
| 580 | * @param pThis Pointer to the read/write critical section.
|
---|
[45110] | 581 | */
|
---|
[45151] | 582 | RTDECL(int) RTCritSectRwEnterExcl(PRTCRITSECTRW pThis);
|
---|
[45110] | 583 |
|
---|
| 584 | /**
|
---|
| 585 | * Enter a critical section with exclusive (write) access.
|
---|
| 586 | *
|
---|
| 587 | * @retval VINF_SUCCESS on success.
|
---|
| 588 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
|
---|
[45151] | 589 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
|
---|
| 590 | * during the operation.
|
---|
[45110] | 591 | *
|
---|
[45151] | 592 | * @param pThis Pointer to the read/write critical section.
|
---|
[45110] | 593 | * @param uId Where we're entering the section.
|
---|
[57926] | 594 | * @param SRC_POS The source position where call is being made from.
|
---|
| 595 | * Use RT_SRC_POS when possible. Optional.
|
---|
[45110] | 596 | */
|
---|
[45151] | 597 | RTDECL(int) RTCritSectRwEnterExclDebug(PRTCRITSECTRW pThis, RTHCUINTPTR uId, RT_SRC_POS_DECL);
|
---|
[45110] | 598 |
|
---|
| 599 | /**
|
---|
| 600 | * Try enter a critical section with exclusive (write) access.
|
---|
| 601 | *
|
---|
[45151] | 602 | * @returns IPRT status code.
|
---|
[45110] | 603 | * @retval VINF_SUCCESS on success.
|
---|
| 604 | * @retval VERR_SEM_BUSY if the critsect was owned.
|
---|
| 605 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
|
---|
[45151] | 606 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
|
---|
| 607 | * during the operation.
|
---|
[45110] | 608 | *
|
---|
[45151] | 609 | * @param pThis Pointer to the read/write critical section.
|
---|
[45110] | 610 | */
|
---|
[45151] | 611 | RTDECL(int) RTCritSectRwTryEnterExcl(PRTCRITSECTRW pThis);
|
---|
[45110] | 612 |
|
---|
| 613 | /**
|
---|
| 614 | * Try enter a critical section with exclusive (write) access.
|
---|
| 615 | *
|
---|
[45151] | 616 | * @returns IPRT status code.
|
---|
[45110] | 617 | * @retval VINF_SUCCESS on success.
|
---|
| 618 | * @retval VERR_SEM_BUSY if the critsect was owned.
|
---|
| 619 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
|
---|
[45151] | 620 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
|
---|
| 621 | * during the operation.
|
---|
[45110] | 622 | *
|
---|
[45151] | 623 | * @param pThis Pointer to the read/write critical section.
|
---|
[45110] | 624 | * @param uId Where we're entering the section.
|
---|
[57926] | 625 | * @param SRC_POS The source position where call is being made from.
|
---|
| 626 | * Use RT_SRC_POS when possible. Optional.
|
---|
[45110] | 627 | */
|
---|
[45151] | 628 | RTDECL(int) RTCritSectRwTryEnterExclDebug(PRTCRITSECTRW pThis, RTHCUINTPTR uId, RT_SRC_POS_DECL);
|
---|
[45110] | 629 |
|
---|
| 630 | /**
|
---|
| 631 | * Leave a critical section held exclusively.
|
---|
| 632 | *
|
---|
[45151] | 633 | * @returns IPRT status code; VINF_SUCCESS, VERR_NOT_OWNER, VERR_SEM_DESTROYED,
|
---|
| 634 | * or VERR_WRONG_ORDER.
|
---|
| 635 | * @param pThis Pointer to the read/write critical section.
|
---|
[45110] | 636 | */
|
---|
[45151] | 637 | RTDECL(int) RTCritSectRwLeaveExcl(PRTCRITSECTRW pThis);
|
---|
[45110] | 638 |
|
---|
| 639 |
|
---|
| 640 | /**
|
---|
| 641 | * Deletes a critical section.
|
---|
| 642 | *
|
---|
| 643 | * @returns VINF_SUCCESS.
|
---|
[45151] | 644 | * @param pThis Pointer to the read/write critical section.
|
---|
[45110] | 645 | */
|
---|
[45151] | 646 | RTDECL(int) RTCritSectRwDelete(PRTCRITSECTRW pThis);
|
---|
[45110] | 647 |
|
---|
| 648 | /**
|
---|
| 649 | * Checks the caller is the exclusive (write) owner of the critical section.
|
---|
| 650 | *
|
---|
[57978] | 651 | * @retval true if owner.
|
---|
| 652 | * @retval false if not owner.
|
---|
[45151] | 653 | * @param pThis Pointer to the read/write critical section.
|
---|
[45110] | 654 | */
|
---|
[45151] | 655 | RTDECL(bool) RTCritSectRwIsWriteOwner(PRTCRITSECTRW pThis);
|
---|
[45110] | 656 |
|
---|
| 657 | /**
|
---|
[45151] | 658 | * Checks if the caller is one of the read owners of the critical section.
|
---|
[45110] | 659 | *
|
---|
| 660 | * @note !CAUTION! This API doesn't work reliably if lock validation isn't
|
---|
| 661 | * enabled. Meaning, the answer is not trustworhty unless
|
---|
| 662 | * RT_LOCK_STRICT or RTCRITSECTRW_STRICT was defined at build time.
|
---|
| 663 | * Also, make sure you do not use RTCRITSECTRW_FLAGS_NO_LOCK_VAL when
|
---|
| 664 | * creating the semaphore. And finally, if you used a locking class,
|
---|
| 665 | * don't disable deadlock detection by setting cMsMinDeadlock to
|
---|
| 666 | * RT_INDEFINITE_WAIT.
|
---|
| 667 | *
|
---|
| 668 | * In short, only use this for assertions.
|
---|
| 669 | *
|
---|
[45151] | 670 | * @returns @c true if reader, @c false if not.
|
---|
| 671 | * @param pThis Pointer to the read/write critical section.
|
---|
[45110] | 672 | * @param fWannaHear What you'd like to hear when lock validation is not
|
---|
| 673 | * available. (For avoiding asserting all over the
|
---|
| 674 | * place.)
|
---|
| 675 | */
|
---|
[45151] | 676 | RTDECL(bool) RTCritSectRwIsReadOwner(PRTCRITSECTRW pThis, bool fWannaHear);
|
---|
[45110] | 677 |
|
---|
| 678 | /**
|
---|
| 679 | * Gets the write recursion count.
|
---|
| 680 | *
|
---|
| 681 | * @returns The write recursion count (0 if bad critsect).
|
---|
[45151] | 682 | * @param pThis Pointer to the read/write critical section.
|
---|
[45110] | 683 | */
|
---|
[45151] | 684 | RTDECL(uint32_t) RTCritSectRwGetWriteRecursion(PRTCRITSECTRW pThis);
|
---|
[45110] | 685 |
|
---|
| 686 | /**
|
---|
| 687 | * Gets the read recursion count of the current writer.
|
---|
| 688 | *
|
---|
| 689 | * @returns The read recursion count (0 if bad critsect).
|
---|
[45151] | 690 | * @param pThis Pointer to the read/write critical section.
|
---|
[45110] | 691 | */
|
---|
[45151] | 692 | RTDECL(uint32_t) RTCritSectRwGetWriterReadRecursion(PRTCRITSECTRW pThis);
|
---|
[45110] | 693 |
|
---|
| 694 | /**
|
---|
| 695 | * Gets the current number of reads.
|
---|
| 696 | *
|
---|
| 697 | * This includes all read recursions, so it might be higher than the number of
|
---|
| 698 | * read owners. It does not include reads done by the current writer.
|
---|
| 699 | *
|
---|
| 700 | * @returns The read count (0 if bad critsect).
|
---|
[45151] | 701 | * @param pThis Pointer to the read/write critical section.
|
---|
[45110] | 702 | */
|
---|
[45151] | 703 | RTDECL(uint32_t) RTCritSectRwGetReadCount(PRTCRITSECTRW pThis);
|
---|
[45110] | 704 |
|
---|
[51940] | 705 | #endif /* IN_RING3 || IN_RING0 */
|
---|
[45110] | 706 |
|
---|
| 707 | /**
|
---|
| 708 | * Checks if a critical section is initialized or not.
|
---|
| 709 | *
|
---|
[57978] | 710 | * @retval true if initialized.
|
---|
| 711 | * @retval false if not initialized.
|
---|
[45151] | 712 | * @param pThis Pointer to the read/write critical section.
|
---|
[45110] | 713 | */
|
---|
[45151] | 714 | DECLINLINE(bool) RTCritSectRwIsInitialized(PCRTCRITSECTRW pThis)
|
---|
[45110] | 715 | {
|
---|
[45151] | 716 | return pThis->u32Magic == RTCRITSECTRW_MAGIC;
|
---|
[45110] | 717 | }
|
---|
| 718 |
|
---|
| 719 | /* Lock strict build: Remap the three enter calls to the debug versions. */
|
---|
| 720 | #if defined(RT_LOCK_STRICT) && !defined(RTCRITSECTRW_WITHOUT_REMAPPING) && !defined(RT_WITH_MANGLING)
|
---|
[76557] | 721 | # ifdef IPRT_INCLUDED_asm_h
|
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[45151] | 722 | # define RTCritSectRwEnterExcl(pThis) RTCritSectRwEnterExclDebug(pThis, (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
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| 723 | # define RTCritSectRwTryEnterExcl(pThis) RTCritSectRwTryEnterExclDebug(pThis, (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
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| 724 | # define RTCritSectRwEnterShared(pThis) RTCritSectRwEnterSharedDebug(pThis, (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
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| 725 | # define RTCritSectRwTryEnterShared(pThis) RTCritSectRwTryEnterSharedDebug(pThis, (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
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[45110] | 726 | # else
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[45151] | 727 | # define RTCritSectRwEnterExcl(pThis) RTCritSectRwEnterExclDebug(pThis, 0, RT_SRC_POS)
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| 728 | # define RTCritSectRwTryEnterExcl(pThis) RTCritSectRwTryEnterExclDebug(pThis, 0, RT_SRC_POS)
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| 729 | # define RTCritSectRwEnterShared(pThis) RTCritSectRwEnterSharedDebug(pThis, 0, RT_SRC_POS)
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| 730 | # define RTCritSectRwTryEnterShared(pThis) RTCritSectRwTryEnterSharedDebug(pThis, 0, RT_SRC_POS)
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[45110] | 731 | # endif
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| 732 | #endif
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| 733 |
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| 734 | /* Strict lock order: Automatically classify locks by init location. */
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| 735 | #if defined(RT_LOCK_STRICT_ORDER) && defined(IN_RING3) && !defined(RTCRITSECTRW_WITHOUT_REMAPPING) && !defined(RT_WITH_MANGLING)
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[45151] | 736 | # define RTCritSectRwInit(a_pThis) \
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| 737 | RTCritSectRwInitEx((a_pThis), 0 /*fFlags*/, \
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[45110] | 738 | RTLockValidatorClassForSrcPos(RT_SRC_POS, NULL), \
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| 739 | RTLOCKVAL_SUB_CLASS_NONE, NULL)
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| 740 | #endif
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| 741 |
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[1] | 742 | /** @} */
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| 743 |
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[20374] | 744 | RT_C_DECLS_END
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[1] | 745 |
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[76585] | 746 | #endif /* !IPRT_INCLUDED_critsect_h */
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[1] | 747 |
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