| 1 | /** @file
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| 2 | * IPRT - Critical Sections.
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| 3 | */
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| 4 |
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| 5 | /*
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| 6 | * Copyright (C) 2006-2022 Oracle Corporation
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| 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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| 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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| 24 | */
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| 25 |
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| 26 | #ifndef IPRT_INCLUDED_critsect_h
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| 27 | #define IPRT_INCLUDED_critsect_h
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| 28 | #ifndef RT_WITHOUT_PRAGMA_ONCE
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| 29 | # pragma once
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| 30 | #endif
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| 31 |
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| 32 | #include <iprt/cdefs.h>
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| 33 | #include <iprt/types.h>
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| 34 | #include <iprt/assert.h>
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| 35 | #if defined(IN_RING3) || defined(IN_RING0)
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| 36 | # include <iprt/thread.h>
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| 37 | #endif
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| 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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| 41 |
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| 42 | RT_C_DECLS_BEGIN
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| 43 |
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| 44 | /** @defgroup grp_rt_critsect RTCritSect - Critical Sections
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| 45 | *
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| 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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| 49 | *
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| 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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| 56 | *
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| 57 | * Use RTCritSectInit to initialize a critical section; use RTCritSectEnter
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| 58 | * and RTCritSectLeave to acquire and release access.
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| 59 | *
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| 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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| 63 | *
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| 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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| 75 | volatile uint32_t u32Magic;
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| 76 | /** Number of lockers.
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| 77 | * -1 if the section is free. */
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| 78 | volatile int32_t cLockers;
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| 79 | /** The owner thread. */
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| 80 | volatile RTNATIVETHREAD NativeThreadOwner;
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| 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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| 84 | volatile int32_t cNestings;
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| 85 | /** Section flags - the RTCRITSECT_FLAGS_* \#defines. */
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| 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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| 90 | R3R0PTRTYPE(PRTLOCKVALRECEXCL) pValidatorRec;
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| 91 | /** Alignment padding. */
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| 92 | RTHCPTR Alignment;
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| 93 | } RTCRITSECT;
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| 94 | AssertCompileSize(RTCRITSECT, HC_ARCH_BITS == 32 ? 32 : 48);
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| 95 |
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| 96 | /** RTCRITSECT::u32Magic value. (Hiromi Uehara) */
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| 97 | #define RTCRITSECT_MAGIC UINT32_C(0x19790326)
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| 98 |
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| 99 | /** @name RTCritSectInitEx flags / RTCRITSECT::fFlags
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| 100 | * @{ */
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| 101 | /** If set, nesting(/recursion) is not allowed. */
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| 102 | #define RTCRITSECT_FLAGS_NO_NESTING UINT32_C(0x00000001)
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| 103 | /** Disables lock validation. */
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| 104 | #define RTCRITSECT_FLAGS_NO_LOCK_VAL UINT32_C(0x00000002)
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| 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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| 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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| 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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| 115 | /** @} */
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| 116 |
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| 117 |
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| 118 | #if defined(IN_RING3) || defined(IN_RING0)
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| 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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| 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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| 140 | */
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| 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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| 143 |
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| 144 | /**
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| 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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| 153 | * @param pCritSect The critical section.
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| 154 | * @param uSubClass The new sub-class value.
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| 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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| 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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| 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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| 165 | * @param pCritSect The critical section.
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| 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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| 172 | * @returns IPRT status code.
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| 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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| 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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| 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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| 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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| 182 | */
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| 183 | RTDECL(int) RTCritSectEnterDebug(PRTCRITSECT pCritSect, RTHCUINTPTR uId, RT_SRC_POS_DECL);
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| 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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| 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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| 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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| 193 | *
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| 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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| 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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| 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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| 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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| 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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| 211 | */
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| 212 | RTDECL(int) RTCritSectTryEnterDebug(PRTCRITSECT pCritSect, RTHCUINTPTR uId, RT_SRC_POS_DECL);
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| 213 |
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| 214 | # ifdef IN_RING3 /* Crazy APIs: ring-3 only. */
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| 215 |
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| 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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| 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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| 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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| 232 | RTDECL(int) RTCritSectEnterMultiple(size_t cCritSects, PRTCRITSECT *papCritSects);
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| 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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| 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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| 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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| 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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| 249 | *
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| 250 | * @remark See RTCritSectEnterMultiple().
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| 251 | */
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| 252 | RTDECL(int) RTCritSectEnterMultipleDebug(size_t cCritSects, PRTCRITSECT *papCritSects, RTHCUINTPTR uId, RT_SRC_POS_DECL);
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| 253 |
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| 254 | # endif /* IN_RING3 */
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| 255 |
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| 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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| 260 | * @param pCritSect The critical section.
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| 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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| 271 | RTDECL(int) RTCritSectLeaveMultiple(size_t cCritSects, PRTCRITSECT *papCritSects);
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| 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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| 277 | * @param pCritSect The critical section.
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| 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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| 286 | * @param pCritSect The critical section.
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| 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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| 293 | #endif /* IN_RING3 || IN_RING0 */
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| 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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| 300 | * @param pCritSect The critical section.
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| 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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| 312 | * @param pCritSect The critical section.
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| 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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| 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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| 324 | * @param pCritSect The critical section.
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| 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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| 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 (uint32_t)pCritSect->cNestings;
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| 340 | }
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| 341 |
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| 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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| 348 | DECLINLINE(int32_t) RTCritSectGetWaiters(PCRTCRITSECT pCritSect)
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| 349 | {
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| 350 | return pCritSect->cLockers;
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| 351 | }
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| 352 |
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| 353 | /* Lock strict build: Remap the three enter calls to the debug versions. */
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| 354 | #if defined(RT_LOCK_STRICT) && !defined(RTCRITSECT_WITHOUT_REMAPPING) && !defined(RT_WITH_MANGLING)
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| 355 | # ifdef IPRT_INCLUDED_asm_h
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| 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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| 366 | /* Strict lock order: Automatically classify locks by init location. */
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| 367 | #if defined(RT_LOCK_STRICT_ORDER) && defined(IN_RING3) && !defined(RTCRITSECT_WITHOUT_REMAPPING) && !defined(RT_WITH_MANGLING)
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| 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 |
|
|---|
| 374 | /** @} */
|
|---|
| 375 |
|
|---|
| 376 |
|
|---|
| 377 |
|
|---|
| 378 | /** @defgroup grp_rt_critsectrw RTCritSectRw - Read/Write Critical Sections
|
|---|
| 379 | * @ingroup grp_rt
|
|---|
| 380 | * @{
|
|---|
| 381 | */
|
|---|
| 382 |
|
|---|
| 383 | /**
|
|---|
| 384 | * Union that allows us to atomically update both the state and
|
|---|
| 385 | * exclusive owner if the hardware supports cmpxchg16b or similar.
|
|---|
| 386 | */
|
|---|
| 387 | typedef union RTCRITSECTRWSTATE
|
|---|
| 388 | {
|
|---|
| 389 | struct
|
|---|
| 390 | {
|
|---|
| 391 | /** The state variable.
|
|---|
| 392 | * All accesses are atomic and it bits are defined like this:
|
|---|
| 393 | * Bits 0..14 - cReads.
|
|---|
| 394 | * Bit 15 - Unused.
|
|---|
| 395 | * Bits 16..31 - cWrites.
|
|---|
| 396 | * Bit 31 - fDirection; 0=Read, 1=Write.
|
|---|
| 397 | * Bits 32..46 - cWaitingReads
|
|---|
| 398 | * Bit 47 - Unused.
|
|---|
| 399 | * Bits 48..62 - cWaitingWrites - doesn't make sense here, not used.
|
|---|
| 400 | * Bit 63 - Unused.
|
|---|
| 401 | */
|
|---|
| 402 | uint64_t u64State;
|
|---|
| 403 | /** The write owner. */
|
|---|
| 404 | RTNATIVETHREAD hNativeWriter;
|
|---|
| 405 | } s;
|
|---|
| 406 | RTUINT128U u128;
|
|---|
| 407 | } RTCRITSECTRWSTATE;
|
|---|
| 408 |
|
|---|
| 409 |
|
|---|
| 410 | /**
|
|---|
| 411 | * Read/write critical section.
|
|---|
| 412 | */
|
|---|
| 413 | typedef struct RTCRITSECTRW
|
|---|
| 414 | {
|
|---|
| 415 | /** Magic used to validate the section state.
|
|---|
| 416 | * RTCRITSECTRW_MAGIC is the value of an initialized & operational section. */
|
|---|
| 417 | volatile uint32_t u32Magic;
|
|---|
| 418 |
|
|---|
| 419 | /** Indicates whether hEvtRead needs resetting. */
|
|---|
| 420 | bool volatile fNeedReset;
|
|---|
| 421 | /** Explicit alignment padding. */
|
|---|
| 422 | bool volatile afPadding[1];
|
|---|
| 423 | /** Section flags - the RTCRITSECT_FLAGS_* \#defines. */
|
|---|
| 424 | uint16_t fFlags;
|
|---|
| 425 |
|
|---|
| 426 | /** The number of reads made by the current writer. */
|
|---|
| 427 | uint32_t volatile cWriterReads;
|
|---|
| 428 | /** The number of recursions made by the current writer. (The initial grabbing
|
|---|
| 429 | * of the lock counts as the first one.) */
|
|---|
| 430 | uint32_t volatile cWriteRecursions;
|
|---|
| 431 | /** The core state. */
|
|---|
| 432 | RTCRITSECTRWSTATE volatile u;
|
|---|
| 433 |
|
|---|
| 434 | /** What the writer threads are blocking on. */
|
|---|
| 435 | RTSEMEVENT hEvtWrite;
|
|---|
| 436 | /** What the read threads are blocking on when waiting for the writer to
|
|---|
| 437 | * finish. */
|
|---|
| 438 | RTSEMEVENTMULTI hEvtRead;
|
|---|
| 439 |
|
|---|
| 440 | /** The validator record for the writer. */
|
|---|
| 441 | R3R0PTRTYPE(PRTLOCKVALRECEXCL) pValidatorWrite;
|
|---|
| 442 | /** The validator record for the readers. */
|
|---|
| 443 | R3R0PTRTYPE(PRTLOCKVALRECSHRD) pValidatorRead;
|
|---|
| 444 | } RTCRITSECTRW;
|
|---|
| 445 | AssertCompileSize(RTCRITSECTRW, HC_ARCH_BITS == 32 ? 48 : 64);
|
|---|
| 446 |
|
|---|
| 447 | /** RTCRITSECTRW::u32Magic value. (Eric Allan Dolphy, Jr.) */
|
|---|
| 448 | #define RTCRITSECTRW_MAGIC UINT32_C(0x19280620)
|
|---|
| 449 | /** RTCRITSECTRW::u32Magic dead value. */
|
|---|
| 450 | #define RTCRITSECTRW_MAGIC_DEAD UINT32_C(0x19640629)
|
|---|
| 451 |
|
|---|
| 452 | /** @name RTCRITSECTRW::u64State values.
|
|---|
| 453 | * @note Using RTCSRW instead of RTCRITSECTRW to save space.
|
|---|
| 454 | * @{ */
|
|---|
| 455 | #define RTCSRW_CNT_BITS 15
|
|---|
| 456 | #define RTCSRW_CNT_MASK UINT64_C(0x00007fff)
|
|---|
| 457 |
|
|---|
| 458 | #define RTCSRW_CNT_RD_SHIFT 0
|
|---|
| 459 | #define RTCSRW_CNT_RD_MASK (RTCSRW_CNT_MASK << RTCSRW_CNT_RD_SHIFT)
|
|---|
| 460 | #define RTCSRW_CNT_WR_SHIFT 16
|
|---|
| 461 | #define RTCSRW_CNT_WR_MASK (RTCSRW_CNT_MASK << RTCSRW_CNT_WR_SHIFT)
|
|---|
| 462 |
|
|---|
| 463 | #define RTCSRW_DIR_SHIFT 31
|
|---|
| 464 | #define RTCSRW_DIR_MASK RT_BIT_64(RTCSRW_DIR_SHIFT)
|
|---|
| 465 | #define RTCSRW_DIR_READ UINT64_C(0)
|
|---|
| 466 | #define RTCSRW_DIR_WRITE UINT64_C(1)
|
|---|
| 467 |
|
|---|
| 468 | #define RTCSRW_WAIT_CNT_RD_SHIFT 32
|
|---|
| 469 | #define RTCSRW_WAIT_CNT_RD_MASK (RTCSRW_CNT_MASK << RTCSRW_WAIT_CNT_RD_SHIFT)
|
|---|
| 470 | /* #define RTCSRW_WAIT_CNT_WR_SHIFT 48 */
|
|---|
| 471 | /* #define RTCSRW_WAIT_CNT_WR_MASK (RTCSRW_CNT_MASK << RTCSRW_WAIT_CNT_WR_SHIFT) */
|
|---|
| 472 | /** @} */
|
|---|
| 473 |
|
|---|
| 474 | #if defined(IN_RING3) || defined(IN_RING0)
|
|---|
| 475 |
|
|---|
| 476 | /**
|
|---|
| 477 | * Initialize a critical section.
|
|---|
| 478 | */
|
|---|
| 479 | RTDECL(int) RTCritSectRwInit(PRTCRITSECTRW pThis);
|
|---|
| 480 |
|
|---|
| 481 | /**
|
|---|
| 482 | * Initialize a critical section.
|
|---|
| 483 | *
|
|---|
| 484 | * @returns IPRT status code.
|
|---|
| 485 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 486 | * @param fFlags Flags, any combination of the RTCRITSECT_FLAGS
|
|---|
| 487 | * \#defines.
|
|---|
| 488 | * @param hClass The class (no reference consumed). If NIL, no lock
|
|---|
| 489 | * order validation will be performed on this lock.
|
|---|
| 490 | * @param uSubClass The sub-class. This is used to define lock order
|
|---|
| 491 | * within a class. RTLOCKVAL_SUB_CLASS_NONE is the
|
|---|
| 492 | * recommended value here.
|
|---|
| 493 | * @param pszNameFmt Name format string for the lock validator, optional
|
|---|
| 494 | * (NULL). Max length is 32 bytes.
|
|---|
| 495 | * @param ... Format string arguments.
|
|---|
| 496 | */
|
|---|
| 497 | RTDECL(int) RTCritSectRwInitEx(PRTCRITSECTRW pThis, uint32_t fFlags, RTLOCKVALCLASS hClass, uint32_t uSubClass,
|
|---|
| 498 | const char *pszNameFmt, ...) RT_IPRT_FORMAT_ATTR_MAYBE_NULL(5, 6);
|
|---|
| 499 |
|
|---|
| 500 | /**
|
|---|
| 501 | * Changes the lock validator sub-class of the critical section.
|
|---|
| 502 | *
|
|---|
| 503 | * It is recommended to try make sure that nobody is using this critical section
|
|---|
| 504 | * while changing the value.
|
|---|
| 505 | *
|
|---|
| 506 | * @returns The old sub-class. RTLOCKVAL_SUB_CLASS_INVALID is returns if the
|
|---|
| 507 | * lock validator isn't compiled in or either of the parameters are
|
|---|
| 508 | * invalid.
|
|---|
| 509 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 510 | * @param uSubClass The new sub-class value.
|
|---|
| 511 | */
|
|---|
| 512 | RTDECL(uint32_t) RTCritSectRwSetSubClass(PRTCRITSECTRW pThis, uint32_t uSubClass);
|
|---|
| 513 |
|
|---|
| 514 |
|
|---|
| 515 | /**
|
|---|
| 516 | * Enter a critical section with shared (read) access.
|
|---|
| 517 | *
|
|---|
| 518 | * @returns IPRT status code.
|
|---|
| 519 | * @retval VINF_SUCCESS on success.
|
|---|
| 520 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
|
|---|
| 521 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
|
|---|
| 522 | * during the operation.
|
|---|
| 523 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 524 | */
|
|---|
| 525 | RTDECL(int) RTCritSectRwEnterShared(PRTCRITSECTRW pThis);
|
|---|
| 526 |
|
|---|
| 527 | /**
|
|---|
| 528 | * Enter a critical section with shared (read) access.
|
|---|
| 529 | *
|
|---|
| 530 | * @returns IPRT status code.
|
|---|
| 531 | * @retval VINF_SUCCESS on success.
|
|---|
| 532 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
|
|---|
| 533 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
|
|---|
| 534 | * during the operation.
|
|---|
| 535 | *
|
|---|
| 536 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 537 | * @param uId Where we're entering the section.
|
|---|
| 538 | * @param SRC_POS The source position where call is being made from.
|
|---|
| 539 | * Use RT_SRC_POS when possible. Optional.
|
|---|
| 540 | */
|
|---|
| 541 | RTDECL(int) RTCritSectRwEnterSharedDebug(PRTCRITSECTRW pThis, RTHCUINTPTR uId, RT_SRC_POS_DECL);
|
|---|
| 542 |
|
|---|
| 543 | /**
|
|---|
| 544 | * Try enter a critical section with shared (read) access.
|
|---|
| 545 | *
|
|---|
| 546 | * @returns IPRT status code.
|
|---|
| 547 | * @retval VINF_SUCCESS on success.
|
|---|
| 548 | * @retval VERR_SEM_BUSY if the critsect was owned.
|
|---|
| 549 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
|
|---|
| 550 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
|
|---|
| 551 | * during the operation.
|
|---|
| 552 | *
|
|---|
| 553 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 554 | */
|
|---|
| 555 | RTDECL(int) RTCritSectRwTryEnterShared(PRTCRITSECTRW pThis);
|
|---|
| 556 |
|
|---|
| 557 | /**
|
|---|
| 558 | * Try enter a critical section with shared (read) access.
|
|---|
| 559 | *
|
|---|
| 560 | * @returns IPRT status code.
|
|---|
| 561 | * @retval VINF_SUCCESS on success.
|
|---|
| 562 | * @retval VERR_SEM_BUSY if the critsect was owned.
|
|---|
| 563 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
|
|---|
| 564 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
|
|---|
| 565 | * during the operation.
|
|---|
| 566 | *
|
|---|
| 567 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 568 | * @param uId Where we're entering the section.
|
|---|
| 569 | * @param SRC_POS The source position where call is being made from.
|
|---|
| 570 | * Use RT_SRC_POS when possible. Optional.
|
|---|
| 571 | */
|
|---|
| 572 | RTDECL(int) RTCritSectRwTryEnterSharedDebug(PRTCRITSECTRW pThis, RTHCUINTPTR uId, RT_SRC_POS_DECL);
|
|---|
| 573 |
|
|---|
| 574 | /**
|
|---|
| 575 | * Leave a critical section held with shared access.
|
|---|
| 576 | *
|
|---|
| 577 | * @returns IPRT status code.
|
|---|
| 578 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 579 | */
|
|---|
| 580 | RTDECL(int) RTCritSectRwLeaveShared(PRTCRITSECTRW pThis);
|
|---|
| 581 |
|
|---|
| 582 |
|
|---|
| 583 | /**
|
|---|
| 584 | * Enter a critical section with exclusive (write) access.
|
|---|
| 585 | *
|
|---|
| 586 | * @returns IPRT status code.
|
|---|
| 587 | * @retval VINF_SUCCESS on success.
|
|---|
| 588 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
|
|---|
| 589 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
|
|---|
| 590 | * during the operation.
|
|---|
| 591 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 592 | */
|
|---|
| 593 | RTDECL(int) RTCritSectRwEnterExcl(PRTCRITSECTRW pThis);
|
|---|
| 594 |
|
|---|
| 595 | /**
|
|---|
| 596 | * Enter a critical section with exclusive (write) access.
|
|---|
| 597 | *
|
|---|
| 598 | * @retval VINF_SUCCESS on success.
|
|---|
| 599 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
|
|---|
| 600 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
|
|---|
| 601 | * during the operation.
|
|---|
| 602 | *
|
|---|
| 603 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 604 | * @param uId Where we're entering the section.
|
|---|
| 605 | * @param SRC_POS The source position where call is being made from.
|
|---|
| 606 | * Use RT_SRC_POS when possible. Optional.
|
|---|
| 607 | */
|
|---|
| 608 | RTDECL(int) RTCritSectRwEnterExclDebug(PRTCRITSECTRW pThis, RTHCUINTPTR uId, RT_SRC_POS_DECL);
|
|---|
| 609 |
|
|---|
| 610 | /**
|
|---|
| 611 | * Try enter a critical section with exclusive (write) access.
|
|---|
| 612 | *
|
|---|
| 613 | * @returns IPRT status code.
|
|---|
| 614 | * @retval VINF_SUCCESS on success.
|
|---|
| 615 | * @retval VERR_SEM_BUSY if the critsect was owned.
|
|---|
| 616 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
|
|---|
| 617 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
|
|---|
| 618 | * during the operation.
|
|---|
| 619 | *
|
|---|
| 620 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 621 | */
|
|---|
| 622 | RTDECL(int) RTCritSectRwTryEnterExcl(PRTCRITSECTRW pThis);
|
|---|
| 623 |
|
|---|
| 624 | /**
|
|---|
| 625 | * Try enter a critical section with exclusive (write) access.
|
|---|
| 626 | *
|
|---|
| 627 | * @returns IPRT status code.
|
|---|
| 628 | * @retval VINF_SUCCESS on success.
|
|---|
| 629 | * @retval VERR_SEM_BUSY if the critsect was owned.
|
|---|
| 630 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
|
|---|
| 631 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
|
|---|
| 632 | * during the operation.
|
|---|
| 633 | *
|
|---|
| 634 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 635 | * @param uId Where we're entering the section.
|
|---|
| 636 | * @param SRC_POS The source position where call is being made from.
|
|---|
| 637 | * Use RT_SRC_POS when possible. Optional.
|
|---|
| 638 | */
|
|---|
| 639 | RTDECL(int) RTCritSectRwTryEnterExclDebug(PRTCRITSECTRW pThis, RTHCUINTPTR uId, RT_SRC_POS_DECL);
|
|---|
| 640 |
|
|---|
| 641 | /**
|
|---|
| 642 | * Leave a critical section held exclusively.
|
|---|
| 643 | *
|
|---|
| 644 | * @returns IPRT status code; VINF_SUCCESS, VERR_NOT_OWNER, VERR_SEM_DESTROYED,
|
|---|
| 645 | * or VERR_WRONG_ORDER.
|
|---|
| 646 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 647 | */
|
|---|
| 648 | RTDECL(int) RTCritSectRwLeaveExcl(PRTCRITSECTRW pThis);
|
|---|
| 649 |
|
|---|
| 650 |
|
|---|
| 651 | /**
|
|---|
| 652 | * Deletes a critical section.
|
|---|
| 653 | *
|
|---|
| 654 | * @returns VINF_SUCCESS.
|
|---|
| 655 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 656 | */
|
|---|
| 657 | RTDECL(int) RTCritSectRwDelete(PRTCRITSECTRW pThis);
|
|---|
| 658 |
|
|---|
| 659 | /**
|
|---|
| 660 | * Checks the caller is the exclusive (write) owner of the critical section.
|
|---|
| 661 | *
|
|---|
| 662 | * @retval true if owner.
|
|---|
| 663 | * @retval false if not owner.
|
|---|
| 664 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 665 | */
|
|---|
| 666 | RTDECL(bool) RTCritSectRwIsWriteOwner(PRTCRITSECTRW pThis);
|
|---|
| 667 |
|
|---|
| 668 | /**
|
|---|
| 669 | * Checks if the caller is one of the read owners of the critical section.
|
|---|
| 670 | *
|
|---|
| 671 | * @note !CAUTION! This API doesn't work reliably if lock validation isn't
|
|---|
| 672 | * enabled. Meaning, the answer is not trustworhty unless
|
|---|
| 673 | * RT_LOCK_STRICT or RTCRITSECTRW_STRICT was defined at build time.
|
|---|
| 674 | * Also, make sure you do not use RTCRITSECTRW_FLAGS_NO_LOCK_VAL when
|
|---|
| 675 | * creating the semaphore. And finally, if you used a locking class,
|
|---|
| 676 | * don't disable deadlock detection by setting cMsMinDeadlock to
|
|---|
| 677 | * RT_INDEFINITE_WAIT.
|
|---|
| 678 | *
|
|---|
| 679 | * In short, only use this for assertions.
|
|---|
| 680 | *
|
|---|
| 681 | * @returns @c true if reader, @c false if not.
|
|---|
| 682 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 683 | * @param fWannaHear What you'd like to hear when lock validation is not
|
|---|
| 684 | * available. (For avoiding asserting all over the
|
|---|
| 685 | * place.)
|
|---|
| 686 | */
|
|---|
| 687 | RTDECL(bool) RTCritSectRwIsReadOwner(PRTCRITSECTRW pThis, bool fWannaHear);
|
|---|
| 688 |
|
|---|
| 689 | /**
|
|---|
| 690 | * Gets the write recursion count.
|
|---|
| 691 | *
|
|---|
| 692 | * @returns The write recursion count (0 if bad critsect).
|
|---|
| 693 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 694 | */
|
|---|
| 695 | RTDECL(uint32_t) RTCritSectRwGetWriteRecursion(PRTCRITSECTRW pThis);
|
|---|
| 696 |
|
|---|
| 697 | /**
|
|---|
| 698 | * Gets the read recursion count of the current writer.
|
|---|
| 699 | *
|
|---|
| 700 | * @returns The read recursion count (0 if bad critsect).
|
|---|
| 701 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 702 | */
|
|---|
| 703 | RTDECL(uint32_t) RTCritSectRwGetWriterReadRecursion(PRTCRITSECTRW pThis);
|
|---|
| 704 |
|
|---|
| 705 | /**
|
|---|
| 706 | * Gets the current number of reads.
|
|---|
| 707 | *
|
|---|
| 708 | * This includes all read recursions, so it might be higher than the number of
|
|---|
| 709 | * read owners. It does not include reads done by the current writer.
|
|---|
| 710 | *
|
|---|
| 711 | * @returns The read count (0 if bad critsect).
|
|---|
| 712 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 713 | */
|
|---|
| 714 | RTDECL(uint32_t) RTCritSectRwGetReadCount(PRTCRITSECTRW pThis);
|
|---|
| 715 |
|
|---|
| 716 | #endif /* IN_RING3 || IN_RING0 */
|
|---|
| 717 |
|
|---|
| 718 | /**
|
|---|
| 719 | * Checks if a critical section is initialized or not.
|
|---|
| 720 | *
|
|---|
| 721 | * @retval true if initialized.
|
|---|
| 722 | * @retval false if not initialized.
|
|---|
| 723 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 724 | */
|
|---|
| 725 | DECLINLINE(bool) RTCritSectRwIsInitialized(PCRTCRITSECTRW pThis)
|
|---|
| 726 | {
|
|---|
| 727 | return pThis->u32Magic == RTCRITSECTRW_MAGIC;
|
|---|
| 728 | }
|
|---|
| 729 |
|
|---|
| 730 | /* Lock strict build: Remap the three enter calls to the debug versions. */
|
|---|
| 731 | #if defined(RT_LOCK_STRICT) && !defined(RTCRITSECTRW_WITHOUT_REMAPPING) && !defined(RT_WITH_MANGLING)
|
|---|
| 732 | # ifdef IPRT_INCLUDED_asm_h
|
|---|
| 733 | # define RTCritSectRwEnterExcl(pThis) RTCritSectRwEnterExclDebug(pThis, (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
|
|---|
| 734 | # define RTCritSectRwTryEnterExcl(pThis) RTCritSectRwTryEnterExclDebug(pThis, (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
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| 735 | # define RTCritSectRwEnterShared(pThis) RTCritSectRwEnterSharedDebug(pThis, (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
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| 736 | # define RTCritSectRwTryEnterShared(pThis) RTCritSectRwTryEnterSharedDebug(pThis, (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
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| 737 | # else
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| 738 | # define RTCritSectRwEnterExcl(pThis) RTCritSectRwEnterExclDebug(pThis, 0, RT_SRC_POS)
|
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| 739 | # define RTCritSectRwTryEnterExcl(pThis) RTCritSectRwTryEnterExclDebug(pThis, 0, RT_SRC_POS)
|
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| 740 | # define RTCritSectRwEnterShared(pThis) RTCritSectRwEnterSharedDebug(pThis, 0, RT_SRC_POS)
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| 741 | # define RTCritSectRwTryEnterShared(pThis) RTCritSectRwTryEnterSharedDebug(pThis, 0, RT_SRC_POS)
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| 742 | # endif
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| 743 | #endif
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| 744 |
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| 745 | /* Strict lock order: Automatically classify locks by init location. */
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| 746 | #if defined(RT_LOCK_STRICT_ORDER) && defined(IN_RING3) && !defined(RTCRITSECTRW_WITHOUT_REMAPPING) && !defined(RT_WITH_MANGLING)
|
|---|
| 747 | # define RTCritSectRwInit(a_pThis) \
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|---|
| 748 | RTCritSectRwInitEx((a_pThis), 0 /*fFlags*/, \
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| 749 | RTLockValidatorClassForSrcPos(RT_SRC_POS, NULL), \
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| 750 | RTLOCKVAL_SUB_CLASS_NONE, NULL)
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| 751 | #endif
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| 752 |
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| 753 | /** @} */
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| 754 |
|
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| 755 | RT_C_DECLS_END
|
|---|
| 756 |
|
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| 757 | #endif /* !IPRT_INCLUDED_critsect_h */
|
|---|
| 758 |
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