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Diffstat (limited to 'include/iprt/lockvalidator.h')
| -rw-r--r-- | include/iprt/lockvalidator.h | 1133 |
1 files changed, 1133 insertions, 0 deletions
diff --git a/include/iprt/lockvalidator.h b/include/iprt/lockvalidator.h new file mode 100644 index 00000000..a83c4877 --- /dev/null +++ b/include/iprt/lockvalidator.h @@ -0,0 +1,1133 @@ +/** @file + * IPRT - Lock Validator. + */ + +/* + * Copyright (C) 2009-2019 Oracle Corporation + * + * This file is part of VirtualBox Open Source Edition (OSE), as + * available from http://www.virtualbox.org. This file is free software; + * you can redistribute it and/or modify it under the terms of the GNU + * General Public License (GPL) as published by the Free Software + * Foundation, in version 2 as it comes in the "COPYING" file of the + * VirtualBox OSE distribution. VirtualBox OSE is distributed in the + * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL) only, as it comes in the "COPYING.CDDL" file of the + * VirtualBox OSE distribution, in which case the provisions of the + * CDDL are applicable instead of those of the GPL. + * + * You may elect to license modified versions of this file under the + * terms and conditions of either the GPL or the CDDL or both. + */ + +#ifndef IPRT_INCLUDED_lockvalidator_h +#define IPRT_INCLUDED_lockvalidator_h +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +#include <iprt/cdefs.h> +#include <iprt/types.h> +#include <iprt/assert.h> +#include <iprt/thread.h> +#include <iprt/stdarg.h> + + +/** @defgroup grp_rtlockval RTLockValidator - Lock Validator + * @ingroup grp_rt + * @{ + */ + +RT_C_DECLS_BEGIN + +/** Pointer to a record union. + * @internal */ +typedef union RTLOCKVALRECUNION *PRTLOCKVALRECUNION; + +/** + * Source position. + */ +typedef struct RTLOCKVALSRCPOS +{ + /** The file where the lock was taken. */ + R3R0PTRTYPE(const char * volatile) pszFile; + /** The function where the lock was taken. */ + R3R0PTRTYPE(const char * volatile) pszFunction; + /** Some ID indicating where the lock was taken, typically an address. */ + RTHCUINTPTR volatile uId; + /** The line number in the file. */ + uint32_t volatile uLine; +#if HC_ARCH_BITS == 64 + uint32_t u32Padding; /**< Alignment padding. */ +#endif +} RTLOCKVALSRCPOS; +AssertCompileSize(RTLOCKVALSRCPOS, HC_ARCH_BITS == 32 ? 16 : 32); +/* The pointer types are defined in iprt/types.h. */ + +/** @def RTLOCKVALSRCPOS_INIT + * Initializer for a RTLOCKVALSRCPOS variable. + * + * @param pszFile The file name. Optional (NULL). + * @param uLine The line number in that file. Optional (0). + * @param pszFunction The function. Optional (NULL). + * @param uId Some location ID, normally the return address. + * Optional (NULL). + */ +#if HC_ARCH_BITS == 64 +# define RTLOCKVALSRCPOS_INIT(pszFile, uLine, pszFunction, uId) \ + { (pszFile), (pszFunction), (uId), (uLine), 0 } +#else +# define RTLOCKVALSRCPOS_INIT(pszFile, uLine, pszFunction, uId) \ + { (pszFile), (pszFunction), (uId), (uLine) } +#endif + +/** @def RTLOCKVALSRCPOS_INIT_DEBUG_API + * Initializer for a RTLOCKVALSRCPOS variable in a typicial debug API + * variant. Assumes RT_SRC_POS_DECL and RTHCUINTPTR uId as arguments. + */ +#define RTLOCKVALSRCPOS_INIT_DEBUG_API() \ + RTLOCKVALSRCPOS_INIT(pszFile, iLine, pszFunction, uId) + +/** @def RTLOCKVALSRCPOS_INIT_NORMAL_API + * Initializer for a RTLOCKVALSRCPOS variable in a normal API + * variant. Assumes iprt/asm.h is included. + */ +#define RTLOCKVALSRCPOS_INIT_NORMAL_API() \ + RTLOCKVALSRCPOS_INIT(__FILE__, __LINE__, __PRETTY_FUNCTION__, (uintptr_t)ASMReturnAddress()) + +/** @def RTLOCKVALSRCPOS_INIT_POS_NO_ID + * Initializer for a RTLOCKVALSRCPOS variable when no @c uId is present. + * Assumes iprt/asm.h is included. + */ +#define RTLOCKVALSRCPOS_INIT_POS_NO_ID() \ + RTLOCKVALSRCPOS_INIT(pszFile, iLine, pszFunction, (uintptr_t)ASMReturnAddress()) + + +/** + * Lock validator record core. + */ +typedef struct RTLOCKVALRECORE +{ + /** The magic value indicating the record type. */ + uint32_t volatile u32Magic; +} RTLOCKVALRECCORE; +/** Pointer to a lock validator record core. */ +typedef RTLOCKVALRECCORE *PRTLOCKVALRECCORE; +/** Pointer to a const lock validator record core. */ +typedef RTLOCKVALRECCORE const *PCRTLOCKVALRECCORE; + + +/** + * Record recording the exclusive ownership of a lock. + * + * This is typically part of the per-lock data structure when compiling with + * the lock validator. + */ +typedef struct RTLOCKVALRECEXCL +{ + /** Record core with RTLOCKVALRECEXCL_MAGIC as the magic value. */ + RTLOCKVALRECCORE Core; + /** Whether it's enabled or not. */ + bool fEnabled; + /** Reserved. */ + bool afReserved[3]; + /** Source position where the lock was taken. */ + RTLOCKVALSRCPOS SrcPos; + /** The current owner thread. */ + RTTHREAD volatile hThread; + /** Pointer to the lock record below us. Only accessed by the owner. */ + R3R0PTRTYPE(PRTLOCKVALRECUNION) pDown; + /** Recursion count */ + uint32_t cRecursion; + /** The lock sub-class. */ + uint32_t volatile uSubClass; + /** The lock class. */ + RTLOCKVALCLASS hClass; + /** Pointer to the lock. */ + RTHCPTR hLock; + /** Pointer to the next sibling record. + * This is used to find the read side of a read-write lock. */ + R3R0PTRTYPE(PRTLOCKVALRECUNION) pSibling; + /** The lock name. + * @remarks The bytes beyond 32 are for better size alignment and can be + * taken and used for other purposes if it becomes necessary. */ + char szName[32 + (HC_ARCH_BITS == 32 ? 12 : 8)]; +} RTLOCKVALRECEXCL; +AssertCompileSize(RTLOCKVALRECEXCL, HC_ARCH_BITS == 32 ? 0x60 : 0x80); +/* The pointer type is defined in iprt/types.h. */ + +/** + * For recording the one ownership share. + */ +typedef struct RTLOCKVALRECSHRDOWN +{ + /** Record core with RTLOCKVALRECSHRDOWN_MAGIC as the magic value. */ + RTLOCKVALRECCORE Core; + /** Recursion count */ + uint16_t cRecursion; + /** Static (true) or dynamic (false) allocated record. */ + bool fStaticAlloc; + /** Reserved. */ + bool fReserved; + /** The current owner thread. */ + RTTHREAD volatile hThread; + /** Pointer to the lock record below us. Only accessed by the owner. */ + R3R0PTRTYPE(PRTLOCKVALRECUNION) pDown; + /** Pointer back to the shared record. */ + R3R0PTRTYPE(PRTLOCKVALRECSHRD) pSharedRec; +#if HC_ARCH_BITS == 32 + /** Reserved. */ + RTHCPTR pvReserved; +#endif + /** Source position where the lock was taken. */ + RTLOCKVALSRCPOS SrcPos; +} RTLOCKVALRECSHRDOWN; +AssertCompileSize(RTLOCKVALRECSHRDOWN, HC_ARCH_BITS == 32 ? 24 + 16 : 32 + 32); +/** Pointer to a RTLOCKVALRECSHRDOWN. */ +typedef RTLOCKVALRECSHRDOWN *PRTLOCKVALRECSHRDOWN; + +/** + * Record recording the shared ownership of a lock. + * + * This is typically part of the per-lock data structure when compiling with + * the lock validator. + */ +typedef struct RTLOCKVALRECSHRD +{ + /** Record core with RTLOCKVALRECSHRD_MAGIC as the magic value. */ + RTLOCKVALRECCORE Core; + /** The lock sub-class. */ + uint32_t volatile uSubClass; + /** The lock class. */ + RTLOCKVALCLASS hClass; + /** Pointer to the lock. */ + RTHCPTR hLock; + /** Pointer to the next sibling record. + * This is used to find the write side of a read-write lock. */ + R3R0PTRTYPE(PRTLOCKVALRECUNION) pSibling; + + /** The number of entries in the table. + * Updated before inserting and after removal. */ + uint32_t volatile cEntries; + /** The index of the last entry (approximately). */ + uint32_t volatile iLastEntry; + /** The max table size. */ + uint32_t volatile cAllocated; + /** Set if the table is being reallocated, clear if not. + * This is used together with rtLockValidatorSerializeDetectionEnter to make + * sure there is exactly one thread doing the reallocation and that nobody is + * using the table at that point. */ + bool volatile fReallocating; + /** Whether it's enabled or not. */ + bool fEnabled; + /** Set if event semaphore signaller, clear if read-write semaphore. */ + bool fSignaller; + /** Alignment padding. */ + bool fPadding; + /** Pointer to a table containing pointers to records of all the owners. */ + R3R0PTRTYPE(PRTLOCKVALRECSHRDOWN volatile *) papOwners; + + /** The lock name. + * @remarks The bytes beyond 32 are for better size alignment and can be + * taken and used for other purposes if it becomes necessary. */ + char szName[32 + (HC_ARCH_BITS == 32 ? 8 : 8)]; +} RTLOCKVALRECSHRD; +AssertCompileSize(RTLOCKVALRECSHRD, HC_ARCH_BITS == 32 ? 0x50 : 0x60); + + +/** + * Makes the two records siblings. + * + * @returns VINF_SUCCESS on success, VERR_SEM_LV_INVALID_PARAMETER if either of + * the records are invalid. + * @param pRec1 Record 1. + * @param pRec2 Record 2. + */ +RTDECL(int) RTLockValidatorRecMakeSiblings(PRTLOCKVALRECCORE pRec1, PRTLOCKVALRECCORE pRec2); + +/** + * Initialize a lock validator record. + * + * Use RTLockValidatorRecExclDelete to deinitialize it. + * + * @param pRec The record. + * @param hClass The class (no reference consumed). If NIL, the + * no lock order validation will be performed on + * this lock. + * @param uSubClass The sub-class. This is used to define lock + * order inside the same class. If you don't know, + * then pass RTLOCKVAL_SUB_CLASS_NONE. + * @param hLock The lock handle. + * @param fEnabled Pass @c false to explicitly disable lock + * validation, otherwise @c true. + * @param pszNameFmt Name format string for the lock validator, + * optional (NULL). Max length is 32 bytes. + * @param ... Format string arguments. + */ +RTDECL(void) RTLockValidatorRecExclInit(PRTLOCKVALRECEXCL pRec, RTLOCKVALCLASS hClass, uint32_t uSubClass, void *hLock, + bool fEnabled, const char *pszNameFmt, ...) RT_IPRT_FORMAT_ATTR_MAYBE_NULL(6, 7); +/** + * Initialize a lock validator record. + * + * Use RTLockValidatorRecExclDelete to deinitialize it. + * + * @param pRec The record. + * @param hClass The class (no reference consumed). If NIL, the + * no lock order validation will be performed on + * this lock. + * @param uSubClass The sub-class. This is used to define lock + * order inside the same class. If you don't know, + * then pass RTLOCKVAL_SUB_CLASS_NONE. + * @param hLock The lock handle. + * @param fEnabled Pass @c false to explicitly disable lock + * validation, otherwise @c true. + * @param pszNameFmt Name format string for the lock validator, + * optional (NULL). Max length is 32 bytes. + * @param va Format string arguments. + */ +RTDECL(void) RTLockValidatorRecExclInitV(PRTLOCKVALRECEXCL pRec, RTLOCKVALCLASS hClass, uint32_t uSubClass, void *hLock, + bool fEnabled, const char *pszNameFmt, va_list va) RT_IPRT_FORMAT_ATTR_MAYBE_NULL(6, 0); +/** + * Uninitialize a lock validator record previously initialized by + * RTLockRecValidatorInit. + * + * @param pRec The record. Must be valid. + */ +RTDECL(void) RTLockValidatorRecExclDelete(PRTLOCKVALRECEXCL pRec); + +/** + * Create and initialize a lock validator record. + * + * Use RTLockValidatorRecExclDestroy to deinitialize and destroy the returned + * record. + * + * @return VINF_SUCCESS or VERR_NO_MEMORY. + * @param ppRec Where to return the record pointer. + * @param hClass The class (no reference consumed). If NIL, the + * no lock order validation will be performed on + * this lock. + * @param uSubClass The sub-class. This is used to define lock + * order inside the same class. If you don't know, + * then pass RTLOCKVAL_SUB_CLASS_NONE. + * @param hLock The lock handle. + * @param fEnabled Pass @c false to explicitly disable lock + * validation, otherwise @c true. + * @param pszNameFmt Name format string for the lock validator, + * optional (NULL). Max length is 32 bytes. + * @param ... Format string arguments. + */ +RTDECL(int) RTLockValidatorRecExclCreate(PRTLOCKVALRECEXCL *ppRec, RTLOCKVALCLASS hClass, uint32_t uSubClass, void *hLock, + bool fEnabled, const char *pszNameFmt, ...) RT_IPRT_FORMAT_ATTR_MAYBE_NULL(6, 7); + +/** + * Create and initialize a lock validator record. + * + * Use RTLockValidatorRecExclDestroy to deinitialize and destroy the returned + * record. + * + * @return VINF_SUCCESS or VERR_NO_MEMORY. + * @param ppRec Where to return the record pointer. + * @param hClass The class (no reference consumed). If NIL, the + * no lock order validation will be performed on + * this lock. + * @param uSubClass The sub-class. This is used to define lock + * order inside the same class. If you don't know, + * then pass RTLOCKVAL_SUB_CLASS_NONE. + * @param hLock The lock handle. + * @param fEnabled Pass @c false to explicitly disable lock + * validation, otherwise @c true. + * @param pszNameFmt Name format string for the lock validator, + * optional (NULL). Max length is 32 bytes. + * @param va Format string arguments. + */ +RTDECL(int) RTLockValidatorRecExclCreateV(PRTLOCKVALRECEXCL *ppRec, RTLOCKVALCLASS hClass, uint32_t uSubClass, void *hLock, + bool fEnabled, const char *pszNameFmt, va_list va) RT_IPRT_FORMAT_ATTR_MAYBE_NULL(6, 0); + +/** + * Deinitialize and destroy a record created by RTLockValidatorRecExclCreate. + * + * @param ppRec Pointer to the record pointer. Will be set to + * NULL. + */ +RTDECL(void) RTLockValidatorRecExclDestroy(PRTLOCKVALRECEXCL *ppRec); + +/** + * Sets the sub-class of the record. + * + * It is recommended to try make sure that nobody is using this class while + * changing the value. + * + * @returns The old sub-class. RTLOCKVAL_SUB_CLASS_INVALID is returns if the + * lock validator isn't compiled in or either of the parameters are + * invalid. + * @param pRec The validator record. + * @param uSubClass The new sub-class value. + */ +RTDECL(uint32_t) RTLockValidatorRecExclSetSubClass(PRTLOCKVALRECEXCL pRec, uint32_t uSubClass); + +/** + * Record the specified thread as lock owner and increment the write lock count. + * + * This function is typically called after acquiring the lock. It accounts for + * recursions so it can be used instead of RTLockValidatorRecExclRecursion. Use + * RTLockValidatorRecExclReleaseOwner to reverse the effect. + * + * @param pRec The validator record. + * @param hThreadSelf The handle of the calling thread. If not known, + * pass NIL_RTTHREAD and we'll figure it out. + * @param pSrcPos The source position of the lock operation. + * @param fFirstRecursion Set if it is the first recursion, clear if not + * sure. + */ +RTDECL(void) RTLockValidatorRecExclSetOwner(PRTLOCKVALRECEXCL pRec, RTTHREAD hThreadSelf, + PCRTLOCKVALSRCPOS pSrcPos, bool fFirstRecursion); + +/** + * Check the exit order and release (unset) the ownership. + * + * This is called by routines implementing releasing an exclusive lock, + * typically before getting down to the final lock releasing. Can be used for + * recursive releasing instead of RTLockValidatorRecExclUnwind. + * + * @retval VINF_SUCCESS on success. + * @retval VERR_SEM_LV_WRONG_RELEASE_ORDER if the order is wrong. Will have + * done all necessary whining and breakpointing before returning. + * @retval VERR_SEM_LV_INVALID_PARAMETER if the input is invalid. + * + * @param pRec The validator record. + * @param fFinalRecursion Set if it's the final recursion, clear if not + * sure. + */ +RTDECL(int) RTLockValidatorRecExclReleaseOwner(PRTLOCKVALRECEXCL pRec, bool fFinalRecursion); + +/** + * Clear the lock ownership and decrement the write lock count. + * + * This is only for special cases where we wish to drop lock validation + * recording. See RTLockValidatorRecExclCheckAndRelease. + * + * @param pRec The validator record. + */ +RTDECL(void) RTLockValidatorRecExclReleaseOwnerUnchecked(PRTLOCKVALRECEXCL pRec); + +/** + * Checks and records a lock recursion. + * + * @retval VINF_SUCCESS on success. + * @retval VERR_SEM_LV_NESTED if the semaphore class forbids recursion. Gone + * thru the motions. + * @retval VERR_SEM_LV_WRONG_ORDER if the locking order is wrong. Gone thru + * the motions. + * @retval VERR_SEM_LV_INVALID_PARAMETER if the input is invalid. + * + * @param pRec The validator record. + * @param pSrcPos The source position of the lock operation. + */ +RTDECL(int) RTLockValidatorRecExclRecursion(PRTLOCKVALRECEXCL pRec, PCRTLOCKVALSRCPOS pSrcPos); + +/** + * Checks and records a lock unwind (releasing one recursion). + * + * This should be coupled with called to RTLockValidatorRecExclRecursion. + * + * @retval VINF_SUCCESS on success. + * @retval VERR_SEM_LV_WRONG_RELEASE_ORDER if the release order is wrong. Gone + * thru the motions. + * @retval VERR_SEM_LV_INVALID_PARAMETER if the input is invalid. + * + * @param pRec The validator record. + */ +RTDECL(int) RTLockValidatorRecExclUnwind(PRTLOCKVALRECEXCL pRec); + +/** + * Checks and records a mixed recursion. + * + * An example of a mixed recursion is a writer requesting read access to a + * SemRW. + * + * This should be coupled with called to RTLockValidatorRecExclUnwindMixed. + * + * @retval VINF_SUCCESS on success. + * @retval VERR_SEM_LV_NESTED if the semaphore class forbids recursion. Gone + * thru the motions. + * @retval VERR_SEM_LV_WRONG_ORDER if the locking order is wrong. Gone thru + * the motions. + * @retval VERR_SEM_LV_INVALID_PARAMETER if the input is invalid. + * + * @param pRec The validator record it to accounted it to. + * @param pRecMixed The validator record it came in on. + * @param pSrcPos The source position of the lock operation. + */ +RTDECL(int) RTLockValidatorRecExclRecursionMixed(PRTLOCKVALRECEXCL pRec, PRTLOCKVALRECCORE pRecMixed, PCRTLOCKVALSRCPOS pSrcPos); + +/** + * Checks and records the unwinding of a mixed recursion. + * + * This should be coupled with called to RTLockValidatorRecExclRecursionMixed. + * + * @retval VINF_SUCCESS on success. + * @retval VERR_SEM_LV_WRONG_RELEASE_ORDER if the release order is wrong. Gone + * thru the motions. + * @retval VERR_SEM_LV_INVALID_PARAMETER if the input is invalid. + * + * @param pRec The validator record it was accounted to. + * @param pRecMixed The validator record it came in on. + */ +RTDECL(int) RTLockValidatorRecExclUnwindMixed(PRTLOCKVALRECEXCL pRec, PRTLOCKVALRECCORE pRecMixed); + +/** + * Check the exclusive locking order. + * + * This is called by routines implementing exclusive lock acquisition. + * + * @retval VINF_SUCCESS on success. + * @retval VERR_SEM_LV_WRONG_ORDER if the order is wrong. Will have done all + * necessary whining and breakpointing before returning. + * @retval VERR_SEM_LV_INVALID_PARAMETER if the input is invalid. + * + * @param pRec The validator record. + * @param hThreadSelf The handle of the calling thread. If not known, + * pass NIL_RTTHREAD and we'll figure it out. + * @param pSrcPos The source position of the lock operation. + * @param cMillies The timeout, in milliseconds. + */ +RTDECL(int) RTLockValidatorRecExclCheckOrder(PRTLOCKVALRECEXCL pRec, RTTHREAD hThreadSelf, + PCRTLOCKVALSRCPOS pSrcPos, RTMSINTERVAL cMillies); + +/** + * Do deadlock detection before blocking on exclusive access to a lock and + * change the thread state. + * + * @retval VINF_SUCCESS - thread is in the specified sleep state. + * @retval VERR_SEM_LV_DEADLOCK if blocking would deadlock. Gone thru the + * motions. + * @retval VERR_SEM_LV_NESTED if the semaphore isn't recursive and hThread is + * already the owner. Gone thru the motions. + * @retval VERR_SEM_LV_ILLEGAL_UPGRADE if it's a deadlock on the same lock. + * The caller must handle any legal upgrades without invoking this + * function (for now). + * @retval VERR_SEM_LV_INVALID_PARAMETER if the input is invalid. + * + * @param pRec The validator record we're blocking on. + * @param hThreadSelf The current thread. Shall not be NIL_RTTHREAD! + * @param pSrcPos The source position of the lock operation. + * @param fRecursiveOk Whether it's ok to recurse. + * @param cMillies The timeout, in milliseconds. + * @param enmSleepState The sleep state to enter on successful return. + * @param fReallySleeping Is it really going to sleep now or not. Use + * false before calls to other IPRT synchronization + * methods. + */ +RTDECL(int) RTLockValidatorRecExclCheckBlocking(PRTLOCKVALRECEXCL pRec, RTTHREAD hThreadSelf, + PCRTLOCKVALSRCPOS pSrcPos, bool fRecursiveOk, RTMSINTERVAL cMillies, + RTTHREADSTATE enmSleepState, bool fReallySleeping); + +/** + * RTLockValidatorRecExclCheckOrder and RTLockValidatorRecExclCheckBlocking + * baked into one call. + * + * @returns Any of the statuses returned by the two APIs. + * @param pRec The validator record. + * @param hThreadSelf The current thread. Shall not be NIL_RTTHREAD! + * @param pSrcPos The source position of the lock operation. + * @param fRecursiveOk Whether it's ok to recurse. + * @param cMillies The timeout, in milliseconds. + * @param enmSleepState The sleep state to enter on successful return. + * @param fReallySleeping Is it really going to sleep now or not. Use + * false before calls to other IPRT synchronization + * methods. + */ +RTDECL(int) RTLockValidatorRecExclCheckOrderAndBlocking(PRTLOCKVALRECEXCL pRec, RTTHREAD hThreadSelf, + PCRTLOCKVALSRCPOS pSrcPos, bool fRecursiveOk, RTMSINTERVAL cMillies, + RTTHREADSTATE enmSleepState, bool fReallySleeping); + +/** + * Initialize a lock validator record for a shared lock. + * + * Use RTLockValidatorRecSharedDelete to deinitialize it. + * + * @param pRec The shared lock record. + * @param hClass The class (no reference consumed). If NIL, the + * no lock order validation will be performed on + * this lock. + * @param uSubClass The sub-class. This is used to define lock + * order inside the same class. If you don't know, + * then pass RTLOCKVAL_SUB_CLASS_NONE. + * @param hLock The lock handle. + * @param fSignaller Set if event semaphore signaller logic should be + * applied to this record, clear if read-write + * semaphore logic should be used. + * @param fEnabled Pass @c false to explicitly disable lock + * validation, otherwise @c true. + * @param pszNameFmt Name format string for the lock validator, + * optional (NULL). Max length is 32 bytes. + * @param ... Format string arguments. + */ +RTDECL(void) RTLockValidatorRecSharedInit(PRTLOCKVALRECSHRD pRec, RTLOCKVALCLASS hClass, uint32_t uSubClass, + void *hLock, bool fSignaller, bool fEnabled, + const char *pszNameFmt, ...) RT_IPRT_FORMAT_ATTR_MAYBE_NULL(7, 8); + +/** + * Initialize a lock validator record for a shared lock. + * + * Use RTLockValidatorRecSharedDelete to deinitialize it. + * + * @param pRec The shared lock record. + * @param hClass The class (no reference consumed). If NIL, the + * no lock order validation will be performed on + * this lock. + * @param uSubClass The sub-class. This is used to define lock + * order inside the same class. If you don't know, + * then pass RTLOCKVAL_SUB_CLASS_NONE. + * @param hLock The lock handle. + * @param fSignaller Set if event semaphore signaller logic should be + * applied to this record, clear if read-write + * semaphore logic should be used. + * @param fEnabled Pass @c false to explicitly disable lock + * validation, otherwise @c true. + * @param pszNameFmt Name format string for the lock validator, + * optional (NULL). Max length is 32 bytes. + * @param va Format string arguments. + */ +RTDECL(void) RTLockValidatorRecSharedInitV(PRTLOCKVALRECSHRD pRec, RTLOCKVALCLASS hClass, uint32_t uSubClass, + void *hLock, bool fSignaller, bool fEnabled, + const char *pszNameFmt, va_list va) RT_IPRT_FORMAT_ATTR_MAYBE_NULL(7, 0); + +/** + * Uninitialize a lock validator record previously initialized by + * RTLockValidatorRecSharedInit. + * + * @param pRec The shared lock record. Must be valid. + */ +RTDECL(void) RTLockValidatorRecSharedDelete(PRTLOCKVALRECSHRD pRec); + +/** + * Create and initialize a lock validator record for a shared lock. + * + * Use RTLockValidatorRecSharedDestroy to deinitialize and destroy the returned + * record. + * + * @returns IPRT status code. + * @param ppRec Where to return the record pointer. + * @param hClass The class (no reference consumed). If NIL, the + * no lock order validation will be performed on + * this lock. + * @param uSubClass The sub-class. This is used to define lock + * order inside the same class. If you don't know, + * then pass RTLOCKVAL_SUB_CLASS_NONE. + * @param pvLock The lock handle or address. + * @param fSignaller Set if event semaphore signaller logic should be + * applied to this record, clear if read-write + * semaphore logic should be used. + * @param fEnabled Pass @c false to explicitly disable lock + * validation, otherwise @c true. + * @param pszNameFmt Name format string for the lock validator, + * optional (NULL). Max length is 32 bytes. + * @param ... Format string arguments. + */ +RTDECL(int) RTLockValidatorRecSharedCreate(PRTLOCKVALRECSHRD *ppRec, RTLOCKVALCLASS hClass, uint32_t uSubClass, + void *pvLock, bool fSignaller, bool fEnabled, + const char *pszNameFmt, ...) RT_IPRT_FORMAT_ATTR_MAYBE_NULL(7, 8); + +/** + * Create and initialize a lock validator record for a shared lock. + * + * Use RTLockValidatorRecSharedDestroy to deinitialize and destroy the returned + * record. + * + * @returns IPRT status code. + * @param ppRec Where to return the record pointer. + * @param hClass The class (no reference consumed). If NIL, the + * no lock order validation will be performed on + * this lock. + * @param uSubClass The sub-class. This is used to define lock + * order inside the same class. If you don't know, + * then pass RTLOCKVAL_SUB_CLASS_NONE. + * @param pvLock The lock handle or address. + * @param fSignaller Set if event semaphore signaller logic should be + * applied to this record, clear if read-write + * semaphore logic should be used. + * @param fEnabled Pass @c false to explicitly disable lock + * validation, otherwise @c true. + * @param pszNameFmt Name format string for the lock validator, + * optional (NULL). Max length is 32 bytes. + * @param va Format string arguments. + */ +RTDECL(int) RTLockValidatorRecSharedCreateV(PRTLOCKVALRECSHRD *ppRec, RTLOCKVALCLASS hClass, uint32_t uSubClass, + void *pvLock, bool fSignaller, bool fEnabled, + const char *pszNameFmt, va_list va) RT_IPRT_FORMAT_ATTR_MAYBE_NULL(7, 0); + +/** + * Deinitialize and destroy a record created by RTLockValidatorRecSharedCreate. + * + * @param ppRec Pointer to the record pointer. Will be set to + * NULL. + */ +RTDECL(void) RTLockValidatorRecSharedDestroy(PRTLOCKVALRECSHRD *ppRec); + +/** + * Sets the sub-class of the record. + * + * It is recommended to try make sure that nobody is using this class while + * changing the value. + * + * @returns The old sub-class. RTLOCKVAL_SUB_CLASS_INVALID is returns if the + * lock validator isn't compiled in or either of the parameters are + * invalid. + * @param pRec The validator record. + * @param uSubClass The new sub-class value. + */ +RTDECL(uint32_t) RTLockValidatorRecSharedSetSubClass(PRTLOCKVALRECSHRD pRec, uint32_t uSubClass); + +/** + * Check the shared locking order. + * + * This is called by routines implementing shared lock acquisition. + * + * @retval VINF_SUCCESS on success. + * @retval VERR_SEM_LV_WRONG_ORDER if the order is wrong. Will have done all + * necessary whining and breakpointing before returning. + * @retval VERR_SEM_LV_INVALID_PARAMETER if the input is invalid. + * + * @param pRec The validator record. + * @param hThreadSelf The handle of the calling thread. If not known, + * pass NIL_RTTHREAD and we'll figure it out. + * @param pSrcPos The source position of the lock operation. + * @param cMillies Intended sleep time in milliseconds. + */ +RTDECL(int) RTLockValidatorRecSharedCheckOrder(PRTLOCKVALRECSHRD pRec, RTTHREAD hThreadSelf, + PCRTLOCKVALSRCPOS pSrcPos, RTMSINTERVAL cMillies); + +/** + * Do deadlock detection before blocking on shared access to a lock and change + * the thread state. + * + * @retval VINF_SUCCESS - thread is in the specified sleep state. + * @retval VERR_SEM_LV_DEADLOCK if blocking would deadlock. Gone thru the + * motions. + * @retval VERR_SEM_LV_NESTED if the semaphore isn't recursive and hThread is + * already the owner. Gone thru the motions. + * @retval VERR_SEM_LV_ILLEGAL_UPGRADE if it's a deadlock on the same lock. + * The caller must handle any legal upgrades without invoking this + * function (for now). + * @retval VERR_SEM_LV_INVALID_PARAMETER if the input is invalid. + * + * @param pRec The validator record we're blocking on. + * @param hThreadSelf The current thread. Shall not be NIL_RTTHREAD! + * @param pSrcPos The source position of the lock operation. + * @param fRecursiveOk Whether it's ok to recurse. + * @param cMillies Intended sleep time in milliseconds. + * @param enmSleepState The sleep state to enter on successful return. + * @param fReallySleeping Is it really going to sleep now or not. Use + * false before calls to other IPRT synchronization + * methods. + */ +RTDECL(int) RTLockValidatorRecSharedCheckBlocking(PRTLOCKVALRECSHRD pRec, RTTHREAD hThreadSelf, + PCRTLOCKVALSRCPOS pSrcPos, bool fRecursiveOk, RTMSINTERVAL cMillies, + RTTHREADSTATE enmSleepState, bool fReallySleeping); + +/** + * RTLockValidatorRecSharedCheckOrder and RTLockValidatorRecSharedCheckBlocking + * baked into one call. + * + * @returns Any of the statuses returned by the two APIs. + * @param pRec The validator record. + * @param hThreadSelf The current thread. Shall not be NIL_RTTHREAD! + * @param pSrcPos The source position of the lock operation. + * @param fRecursiveOk Whether it's ok to recurse. + * @param cMillies Intended sleep time in milliseconds. + * @param enmSleepState The sleep state to enter on successful return. + * @param fReallySleeping Is it really going to sleep now or not. Use + * false before calls to other IPRT synchronization + * methods. + */ +RTDECL(int) RTLockValidatorRecSharedCheckOrderAndBlocking(PRTLOCKVALRECSHRD pRec, RTTHREAD hThreadSelf, + PCRTLOCKVALSRCPOS pSrcPos, bool fRecursiveOk, RTMSINTERVAL cMillies, + RTTHREADSTATE enmSleepState, bool fReallySleeping); + +/** + * Removes all current owners and makes hThread the only owner. + * + * @param pRec The validator record. + * @param hThread The thread handle of the owner. NIL_RTTHREAD is + * an alias for the current thread. + * @param pSrcPos The source position of the lock operation. + */ +RTDECL(void) RTLockValidatorRecSharedResetOwner(PRTLOCKVALRECSHRD pRec, RTTHREAD hThread, PCRTLOCKVALSRCPOS pSrcPos); + +/** + * Adds an owner to a shared locking record. + * + * Takes recursion into account. This function is typically called after + * acquiring the lock in shared mode. + * + * @param pRec The validator record. + * @param hThread The thread handle of the owner. NIL_RTTHREAD is + * an alias for the current thread. + * @param pSrcPos The source position of the lock operation. + */ +RTDECL(void) RTLockValidatorRecSharedAddOwner(PRTLOCKVALRECSHRD pRec, RTTHREAD hThread, PCRTLOCKVALSRCPOS pSrcPos); + +/** + * Removes an owner from a shared locking record. + * + * Takes recursion into account. This function is typically called before + * releasing the lock. + * + * @param pRec The validator record. + * @param hThread The thread handle of the owner. NIL_RTTHREAD is + * an alias for the current thread. + */ +RTDECL(void) RTLockValidatorRecSharedRemoveOwner(PRTLOCKVALRECSHRD pRec, RTTHREAD hThread); + +/** + * Checks if the specified thread is one of the owners. + * + * @returns true if it is, false if not. + * + * @param pRec The validator record. + * @param hThread The thread handle of the owner. NIL_RTTHREAD is + * an alias for the current thread. + */ +RTDECL(bool) RTLockValidatorRecSharedIsOwner(PRTLOCKVALRECSHRD pRec, RTTHREAD hThread); + +/** + * Check the exit order and release (unset) the shared ownership. + * + * This is called by routines implementing releasing the read/write lock. + * + * @retval VINF_SUCCESS on success. + * @retval VERR_SEM_LV_WRONG_RELEASE_ORDER if the order is wrong. Will have + * done all necessary whining and breakpointing before returning. + * @retval VERR_SEM_LV_INVALID_PARAMETER if the input is invalid. + * + * @param pRec The validator record. + * @param hThreadSelf The handle of the calling thread. NIL_RTTHREAD + * is an alias for the current thread. + */ +RTDECL(int) RTLockValidatorRecSharedCheckAndRelease(PRTLOCKVALRECSHRD pRec, RTTHREAD hThreadSelf); + +/** + * Check the signaller of an event. + * + * This is called by routines implementing releasing the event semaphore (both + * kinds). + * + * @retval VINF_SUCCESS on success. + * @retval VERR_SEM_LV_NOT_SIGNALLER if the thread is not in the record. Will + * have done all necessary whining and breakpointing before returning. + * @retval VERR_SEM_LV_INVALID_PARAMETER if the input is invalid. + * + * @param pRec The validator record. + * @param hThreadSelf The handle of the calling thread. NIL_RTTHREAD + * is an alias for the current thread. + */ +RTDECL(int) RTLockValidatorRecSharedCheckSignaller(PRTLOCKVALRECSHRD pRec, RTTHREAD hThreadSelf); + +/** + * Gets the number of write locks and critical sections the specified + * thread owns. + * + * This number does not include any nested lock/critect entries. + * + * Note that it probably will return 0 for non-strict builds since + * release builds doesn't do unnecessary diagnostic counting like this. + * + * @returns Number of locks on success (0+) and VERR_INVALID_HANDLER on failure + * @param Thread The thread we're inquiring about. + * @remarks Will only work for strict builds. + */ +RTDECL(int32_t) RTLockValidatorWriteLockGetCount(RTTHREAD Thread); + +/** + * Works the THREADINT::cWriteLocks member, mostly internal. + * + * @param Thread The current thread. + */ +RTDECL(void) RTLockValidatorWriteLockInc(RTTHREAD Thread); + +/** + * Works the THREADINT::cWriteLocks member, mostly internal. + * + * @param Thread The current thread. + */ +RTDECL(void) RTLockValidatorWriteLockDec(RTTHREAD Thread); + +/** + * Gets the number of read locks the specified thread owns. + * + * Note that nesting read lock entry will be included in the + * total sum. And that it probably will return 0 for non-strict + * builds since release builds doesn't do unnecessary diagnostic + * counting like this. + * + * @returns Number of read locks on success (0+) and VERR_INVALID_HANDLER on failure + * @param Thread The thread we're inquiring about. + */ +RTDECL(int32_t) RTLockValidatorReadLockGetCount(RTTHREAD Thread); + +/** + * Works the THREADINT::cReadLocks member. + * + * @param Thread The current thread. + */ +RTDECL(void) RTLockValidatorReadLockInc(RTTHREAD Thread); + +/** + * Works the THREADINT::cReadLocks member. + * + * @param Thread The current thread. + */ +RTDECL(void) RTLockValidatorReadLockDec(RTTHREAD Thread); + +/** + * Query which lock the specified thread is waiting on. + * + * @returns The lock handle value or NULL. + * @param hThread The thread in question. + */ +RTDECL(void *) RTLockValidatorQueryBlocking(RTTHREAD hThread); + +/** + * Checks if the thread is running in the lock validator after it has entered a + * block state. + * + * @returns true if it is, false if it isn't. + * @param hThread The thread in question. + */ +RTDECL(bool) RTLockValidatorIsBlockedThreadInValidator(RTTHREAD hThread); + +/** + * Checks if the calling thread is holding a lock in the specified class. + * + * @returns true if it holds a lock in the specific class, false if it + * doesn't. + * + * @param hCurrentThread The current thread. Pass NIL_RTTHREAD if you're + * lazy. + * @param hClass The class. + */ +RTDECL(bool) RTLockValidatorHoldsLocksInClass(RTTHREAD hCurrentThread, RTLOCKVALCLASS hClass); + +/** + * Checks if the calling thread is holding a lock in the specified sub-class. + * + * @returns true if it holds a lock in the specific sub-class, false if it + * doesn't. + * + * @param hCurrentThread The current thread. Pass NIL_RTTHREAD if you're + * lazy. + * @param hClass The class. + * @param uSubClass The new sub-class value. + */ +RTDECL(bool) RTLockValidatorHoldsLocksInSubClass(RTTHREAD hCurrentThread, RTLOCKVALCLASS hClass, uint32_t uSubClass); + + + +/** + * Creates a new lock validator class, all properties specified. + * + * @returns IPRT status code + * @param phClass Where to return the class handle. + * @param pSrcPos The source position of the create call. + * @param fAutodidact Whether the class should be allowed to teach + * itself new locking order rules (true), or if the + * user will teach it all it needs to know (false). + * @param fRecursionOk Whether to allow lock recursion or not. + * @param fStrictReleaseOrder Enforce strict lock release order or not. + * @param cMsMinDeadlock Used to raise the sleep interval at which + * deadlock detection kicks in. Minimum is 1 ms, + * while RT_INDEFINITE_WAIT will disable it. + * @param cMsMinOrder Used to raise the sleep interval at which lock + * order validation kicks in. Minimum is 1 ms, + * while RT_INDEFINITE_WAIT will disable it. + * @param pszNameFmt Class name format string, optional (NULL). Max + * length is 32 bytes. + * @param ... Format string arguments. + * + * @remarks The properties can be modified after creation by the + * RTLockValidatorClassSet* methods. + */ +RTDECL(int) RTLockValidatorClassCreateEx(PRTLOCKVALCLASS phClass, PCRTLOCKVALSRCPOS pSrcPos, + bool fAutodidact, bool fRecursionOk, bool fStrictReleaseOrder, + RTMSINTERVAL cMsMinDeadlock, RTMSINTERVAL cMsMinOrder, + const char *pszNameFmt, ...) RT_IPRT_FORMAT_ATTR_MAYBE_NULL(8, 9); + +/** + * Creates a new lock validator class, all properties specified. + * + * @returns IPRT status code + * @param phClass Where to return the class handle. + * @param pSrcPos The source position of the create call. + * @param fAutodidact Whether the class should be allowed to teach + * itself new locking order rules (true), or if the + * user will teach it all it needs to know (false). + * @param fRecursionOk Whether to allow lock recursion or not. + * @param fStrictReleaseOrder Enforce strict lock release order or not. + * @param cMsMinDeadlock Used to raise the sleep interval at which + * deadlock detection kicks in. Minimum is 1 ms, + * while RT_INDEFINITE_WAIT will disable it. + * @param cMsMinOrder Used to raise the sleep interval at which lock + * order validation kicks in. Minimum is 1 ms, + * while RT_INDEFINITE_WAIT will disable it. + * @param pszNameFmt Class name format string, optional (NULL). Max + * length is 32 bytes. + * @param va Format string arguments. + * + * @remarks The properties can be modified after creation by the + * RTLockValidatorClassSet* methods. + */ +RTDECL(int) RTLockValidatorClassCreateExV(PRTLOCKVALCLASS phClass, PCRTLOCKVALSRCPOS pSrcPos, + bool fAutodidact, bool fRecursionOk, bool fStrictReleaseOrder, + RTMSINTERVAL cMsMinDeadlock, RTMSINTERVAL cMsMinOrder, + const char *pszNameFmt, va_list va) RT_IPRT_FORMAT_ATTR_MAYBE_NULL(8, 0); + +/** + * Creates a new lock validator class. + * + * @returns IPRT status code + * @param phClass Where to return the class handle. + * @param fAutodidact Whether the class should be allowed to teach + * itself new locking order rules (true), or if the + * user will teach it all it needs to know (false). + * @param SRC_POS The source position where call is being made from. + * Use RT_SRC_POS when possible. Optional. + * @param pszNameFmt Class name format string, optional (NULL). Max + * length is 32 bytes. + * @param ... Format string arguments. + */ +RTDECL(int) RTLockValidatorClassCreate(PRTLOCKVALCLASS phClass, bool fAutodidact, RT_SRC_POS_DECL, + const char *pszNameFmt, ...) RT_IPRT_FORMAT_ATTR_MAYBE_NULL(6, 7); + +/** + * Creates a new lock validator class with a reference that is consumed by the + * first call to RTLockValidatorClassRetain. + * + * This is tailored for use in the parameter list of a semaphore constructor. + * + * @returns Class handle with a reference that is automatically consumed by the + * first retainer. NIL_RTLOCKVALCLASS if we run into trouble. + * + * @param SRC_POS The source position where call is being made from. + * Use RT_SRC_POS when possible. Optional. + * @param pszNameFmt Class name format string, optional (NULL). Max + * length is 32 bytes. + * @param ... Format string arguments. + */ +RTDECL(RTLOCKVALCLASS) RTLockValidatorClassCreateUnique(RT_SRC_POS_DECL, + const char *pszNameFmt, ...) RT_IPRT_FORMAT_ATTR_MAYBE_NULL(4, 5); + +/** + * Finds a class for the specified source position. + * + * @returns A handle to the class (not retained!) or NIL_RTLOCKVALCLASS. + * @param pSrcPos The source position. + */ +RTDECL(RTLOCKVALCLASS) RTLockValidatorClassFindForSrcPos(PRTLOCKVALSRCPOS pSrcPos); + +/** + * Finds or creates a class given the source position. + * + * @returns Class handle (not retained!) or NIL_RTLOCKVALCLASS. + * @param SRC_POS The source position where call is being made from. + * Use RT_SRC_POS when possible. Optional. + * @param pszNameFmt Class name format string, optional (NULL). Max + * length is 32 bytes. + * @param ... Format string arguments. + */ +RTDECL(RTLOCKVALCLASS) RTLockValidatorClassForSrcPos(RT_SRC_POS_DECL, + const char *pszNameFmt, ...) RT_IPRT_FORMAT_ATTR_MAYBE_NULL(4, 5); + +/** + * Retains a reference to a lock validator class. + * + * @returns New reference count; UINT32_MAX if the handle is invalid. + * @param hClass Handle to the class. + */ +RTDECL(uint32_t) RTLockValidatorClassRetain(RTLOCKVALCLASS hClass); + +/** + * Releases a reference to a lock validator class. + * + * @returns New reference count. 0 if hClass is NIL_RTLOCKVALCLASS. UINT32_MAX + * if the handle is invalid. + * @param hClass Handle to the class. + */ +RTDECL(uint32_t) RTLockValidatorClassRelease(RTLOCKVALCLASS hClass); + +/** + * Teaches the class @a hClass that locks in the class @a hPriorClass can be + * held when taking a lock of class @a hClass + * + * @returns IPRT status. + * @param hClass Handle to the pupil class. + * @param hPriorClass Handle to the class that can be held prior to + * taking a lock in the pupil class. (No reference + * is consumed.) + */ +RTDECL(int) RTLockValidatorClassAddPriorClass(RTLOCKVALCLASS hClass, RTLOCKVALCLASS hPriorClass); + +/** + * Enables or disables the strict release order enforcing. + * + * @returns IPRT status. + * @param hClass Handle to the class to change. + * @param fEnabled Enable it (true) or disable it (false). + */ +RTDECL(int) RTLockValidatorClassEnforceStrictReleaseOrder(RTLOCKVALCLASS hClass, bool fEnabled); + +/** + * Enables / disables the lock validator for new locks. + * + * @returns The old setting. + * @param fEnabled The new setting. + */ +RTDECL(bool) RTLockValidatorSetEnabled(bool fEnabled); + +/** + * Is the lock validator enabled? + * + * @returns True if enabled, false if not. + */ +RTDECL(bool) RTLockValidatorIsEnabled(void); + +/** + * Controls whether the lock validator should be quiet or noisy (default). + * + * @returns The old setting. + * @param fQuiet The new setting. + */ +RTDECL(bool) RTLockValidatorSetQuiet(bool fQuiet); + +/** + * Is the lock validator quiet or noisy? + * + * @returns True if it is quiet, false if noisy. + */ +RTDECL(bool) RTLockValidatorIsQuiet(void); + +/** + * Makes the lock validator panic (default) or not. + * + * @returns The old setting. + * @param fPanic The new setting. + */ +RTDECL(bool) RTLockValidatorSetMayPanic(bool fPanic); + +/** + * Can the lock validator cause panic. + * + * @returns True if it can, false if not. + */ +RTDECL(bool) RTLockValidatorMayPanic(void); + + +RT_C_DECLS_END + +/** @} */ + +#endif /* !IPRT_INCLUDED_lockvalidator_h */ + |