Adding upstream version 7.0.6-dfsg.upstream/7.0.6-dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 768 insertions, 0 deletions

diff --git a/include/iprt/critsect.h b/include/iprt/critsect.h
new file mode 100644
index 00000000..861cb675
--- /dev/null
+++ b/include/iprt/critsect.h
@@ -0,0 +1,768 @@
+/** @file
+ * IPRT - Critical Sections.
+ */
+
+/*
+ * Copyright (C) 2006-2022 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+#ifndef IPRT_INCLUDED_critsect_h
+#define IPRT_INCLUDED_critsect_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <iprt/cdefs.h>
+#include <iprt/types.h>
+#include <iprt/assert.h>
+#if defined(IN_RING3) || defined(IN_RING0)
+# include <iprt/thread.h>
+#endif
+#ifdef RT_LOCK_STRICT_ORDER
+# include <iprt/lockvalidator.h>
+#endif
+
+RT_C_DECLS_BEGIN
+
+/** @defgroup grp_rt_critsect       RTCritSect - Critical Sections
+ *
+ * "Critical section" synchronization primitives can be used to
+ * protect a section of code or data to which access must be exclusive;
+ * only one thread can hold access to a critical section at one time.
+ *
+ * A critical section is a fast recursive write lock; if the critical
+ * section is not acquired, then entering it is fast (requires no system
+ * call). IPRT uses the Windows terminology here; on other platform, this
+ * might be called a "futex" or a "fast mutex". As opposed to IPRT
+ * "fast mutexes" (see @ref grp_rt_sems_fast_mutex ), critical sections
+ * are recursive.
+ *
+ * Use RTCritSectInit to initialize a critical section; use RTCritSectEnter
+ * and RTCritSectLeave to acquire and release access.
+ *
+ * For an overview of all types of synchronization primitives provided
+ * by IPRT (event, mutex/fast mutex/read-write mutex semaphores), see
+ * @ref grp_rt_sems .
+ *
+ * @ingroup grp_rt
+ * @{
+ */
+
+/**
+ * Critical section.
+ */
+typedef struct RTCRITSECT
+{
+    /** Magic used to validate the section state.
+     * RTCRITSECT_MAGIC is the value of an initialized & operational section. */
+    volatile uint32_t                   u32Magic;
+    /** Number of lockers.
+     * -1 if the section is free. */
+    volatile int32_t                    cLockers;
+    /** The owner thread. */
+    volatile RTNATIVETHREAD             NativeThreadOwner;
+    /** Number of nested enter operations performed.
+     * Greater or equal to 1 if owned, 0 when free.
+     */
+    volatile int32_t                    cNestings;
+    /** Section flags - the RTCRITSECT_FLAGS_* \#defines. */
+    uint32_t                            fFlags;
+    /** The semaphore to block on. */
+    RTSEMEVENT                          EventSem;
+    /** Lock validator record.  Only used in strict builds. */
+    R3R0PTRTYPE(PRTLOCKVALRECEXCL)      pValidatorRec;
+    /** Alignment padding. */
+    RTHCPTR                             Alignment;
+} RTCRITSECT;
+AssertCompileSize(RTCRITSECT, HC_ARCH_BITS == 32 ? 32 : 48);
+
+/** RTCRITSECT::u32Magic value. (Hiromi Uehara) */
+#define RTCRITSECT_MAGIC                UINT32_C(0x19790326)
+
+/** @name RTCritSectInitEx flags / RTCRITSECT::fFlags
+ * @{ */
+/** If set, nesting(/recursion) is not allowed. */
+#define RTCRITSECT_FLAGS_NO_NESTING     UINT32_C(0x00000001)
+/** Disables lock validation. */
+#define RTCRITSECT_FLAGS_NO_LOCK_VAL    UINT32_C(0x00000002)
+/** Bootstrap hack for use with certain memory allocator locks only! */
+#define RTCRITSECT_FLAGS_BOOTSTRAP_HACK UINT32_C(0x00000004)
+/** If set, the critical section becomes a dummy that doesn't serialize any
+ * threads.  This flag can only be set at creation time.
+ *
+ * The intended use is avoiding lots of conditional code where some component
+ * might or might not require entering a critical section before access. */
+#define RTCRITSECT_FLAGS_NOP            UINT32_C(0x00000008)
+/** Indicates that this is a ring-0 critical section. */
+#define RTCRITSECT_FLAGS_RING0          UINT32_C(0x00000010)
+/** @} */
+
+
+#if defined(IN_RING3) || defined(IN_RING0)
+
+/**
+ * Initialize a critical section.
+ */
+RTDECL(int) RTCritSectInit(PRTCRITSECT pCritSect);
+
+/**
+ * Initialize a critical section.
+ *
+ * @returns iprt status code.
+ * @param   pCritSect       Pointer to the critical section structure.
+ * @param   fFlags          Flags, any combination of the RTCRITSECT_FLAGS
+ *                          \#defines.
+ * @param   hClass          The class (no reference consumed).  If NIL, no lock
+ *                          order validation will be performed on this lock.
+ * @param   uSubClass       The sub-class.  This is used to define lock order
+ *                          within a class.  RTLOCKVAL_SUB_CLASS_NONE is the
+ *                          recommended value here.
+ * @param   pszNameFmt      Name format string for the lock validator, optional
+ *                          (NULL).  Max length is 32 bytes.
+ * @param   ...             Format string arguments.
+ */
+RTDECL(int) RTCritSectInitEx(PRTCRITSECT pCritSect, uint32_t fFlags, RTLOCKVALCLASS hClass, uint32_t uSubClass,
+                             const char *pszNameFmt, ...) RT_IPRT_FORMAT_ATTR_MAYBE_NULL(5, 6);
+
+/**
+ * Changes the lock validator sub-class of the critical section.
+ *
+ * It is recommended to try make sure that nobody is using this critical section
+ * 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   pCritSect       The critical section.
+ * @param   uSubClass       The new sub-class value.
+ */
+RTDECL(uint32_t) RTCritSectSetSubClass(PRTCRITSECT pCritSect, uint32_t uSubClass);
+
+/**
+ * Enter a critical section.
+ *
+ * @returns VINF_SUCCESS on success.
+ * @returns VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
+ * @retval  VERR_SEM_DESTROYED if the critical section is delete before or
+ *          during the operation.
+ * @param   pCritSect       The critical section.
+ */
+RTDECL(int) RTCritSectEnter(PRTCRITSECT pCritSect);
+
+/**
+ * Enter a critical section.
+ *
+ * @returns IPRT status code.
+ * @retval  VINF_SUCCESS on success.
+ * @retval  VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
+ * @retval  VERR_SEM_DESTROYED if the critical section is delete before or
+ *          during the operation.
+ *
+ * @param   pCritSect       The critical section.
+ * @param   uId             Where we're entering the section.
+ * @param   SRC_POS         The source position where call is being made from.
+ *                          Use RT_SRC_POS when possible.  Optional.
+ */
+RTDECL(int) RTCritSectEnterDebug(PRTCRITSECT pCritSect, RTHCUINTPTR uId, RT_SRC_POS_DECL);
+
+/**
+ * Try enter a critical section.
+ *
+ * @retval  VINF_SUCCESS on success.
+ * @retval  VERR_SEM_BUSY if the critsect was owned.
+ * @retval  VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
+ * @retval  VERR_SEM_DESTROYED if the critical section is delete before or
+ *          during the operation.
+ *
+ * @param   pCritSect   The critical section.
+ */
+RTDECL(int) RTCritSectTryEnter(PRTCRITSECT pCritSect);
+
+/**
+ * Try enter a critical section.
+ *
+ * @retval  VINF_SUCCESS on success.
+ * @retval  VERR_SEM_BUSY if the critsect was owned.
+ * @retval  VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
+ * @retval  VERR_SEM_DESTROYED if the critical section is delete before or
+ *          during the operation.
+ *
+ * @param   pCritSect       The critical section.
+ * @param   uId             Where we're entering the section.
+ * @param   SRC_POS         The source position where call is being made from.
+ *                          Use RT_SRC_POS when possible.  Optional.
+ */
+RTDECL(int) RTCritSectTryEnterDebug(PRTCRITSECT pCritSect, RTHCUINTPTR uId, RT_SRC_POS_DECL);
+
+# ifdef IN_RING3 /* Crazy APIs: ring-3 only. */
+
+/**
+ * Enter multiple critical sections.
+ *
+ * This function will enter ALL the specified critical sections before returning.
+ *
+ * @returns VINF_SUCCESS on success.
+ * @returns VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
+ * @retval  VERR_SEM_DESTROYED if the critical section is delete before or
+ *          during the operation.
+ * @param   cCritSects      Number of critical sections in the array.
+ * @param   papCritSects    Array of critical section pointers.
+ *
+ * @remark  Please note that this function will not necessarily come out favourable in a
+ *          fight with other threads which are using the normal RTCritSectEnter() function.
+ *          Therefore, avoid having to enter multiple critical sections!
+ */
+RTDECL(int) RTCritSectEnterMultiple(size_t cCritSects, PRTCRITSECT *papCritSects);
+
+/**
+ * Enter multiple critical sections.
+ *
+ * This function will enter ALL the specified critical sections before returning.
+ *
+ * @returns VINF_SUCCESS on success.
+ * @returns VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
+ * @retval  VERR_SEM_DESTROYED if the critical section is delete before or
+ *          during the operation.
+ *
+ * @param   cCritSects      Number of critical sections in the array.
+ * @param   papCritSects    Array of critical section pointers.
+ * @param   uId             Where we're entering the section.
+ * @param   SRC_POS         The source position where call is being made from.
+ *                          Use RT_SRC_POS when possible.  Optional.
+ *
+ * @remark  See RTCritSectEnterMultiple().
+ */
+RTDECL(int) RTCritSectEnterMultipleDebug(size_t cCritSects, PRTCRITSECT *papCritSects, RTHCUINTPTR uId, RT_SRC_POS_DECL);
+
+# endif /* IN_RING3 */
+
+/**
+ * Leave a critical section.
+ *
+ * @returns VINF_SUCCESS.
+ * @param   pCritSect       The critical section.
+ */
+RTDECL(int) RTCritSectLeave(PRTCRITSECT pCritSect);
+
+/**
+ * Leave multiple critical sections.
+ *
+ * @returns VINF_SUCCESS.
+ * @param   cCritSects      Number of critical sections in the array.
+ * @param   papCritSects    Array of critical section pointers.
+ */
+RTDECL(int) RTCritSectLeaveMultiple(size_t cCritSects, PRTCRITSECT *papCritSects);
+
+/**
+ * Deletes a critical section.
+ *
+ * @returns VINF_SUCCESS.
+ * @param   pCritSect       The critical section.
+ */
+RTDECL(int) RTCritSectDelete(PRTCRITSECT pCritSect);
+
+/**
+ * Checks the caller is the owner of the critical section.
+ *
+ * @returns true if owner.
+ * @returns false if not owner.
+ * @param   pCritSect       The critical section.
+ */
+DECLINLINE(bool) RTCritSectIsOwner(PCRTCRITSECT pCritSect)
+{
+    return pCritSect->NativeThreadOwner == RTThreadNativeSelf();
+}
+
+#endif /* IN_RING3 || IN_RING0 */
+
+/**
+ * Checks the section is owned by anyone.
+ *
+ * @returns true if owned.
+ * @returns false if not owned.
+ * @param   pCritSect       The critical section.
+ */
+DECLINLINE(bool) RTCritSectIsOwned(PCRTCRITSECT pCritSect)
+{
+    return pCritSect->NativeThreadOwner != NIL_RTNATIVETHREAD;
+}
+
+/**
+ * Gets the thread id of the critical section owner.
+ *
+ * @returns Thread id of the owner thread if owned.
+ * @returns NIL_RTNATIVETHREAD is not owned.
+ * @param   pCritSect       The critical section.
+ */
+DECLINLINE(RTNATIVETHREAD) RTCritSectGetOwner(PCRTCRITSECT pCritSect)
+{
+    return pCritSect->NativeThreadOwner;
+}
+
+/**
+ * Checks if a critical section is initialized or not.
+ *
+ * @returns true if initialized.
+ * @returns false if not initialized.
+ * @param   pCritSect       The critical section.
+ */
+DECLINLINE(bool) RTCritSectIsInitialized(PCRTCRITSECT pCritSect)
+{
+    return pCritSect->u32Magic == RTCRITSECT_MAGIC;
+}
+
+/**
+ * Gets the recursion depth.
+ *
+ * @returns The recursion depth.
+ * @param   pCritSect       The Critical section
+ */
+DECLINLINE(uint32_t) RTCritSectGetRecursion(PCRTCRITSECT pCritSect)
+{
+    return (uint32_t)pCritSect->cNestings;
+}
+
+/**
+ * Gets the waiter count
+ *
+ * @returns The waiter count
+ * @param   pCritSect       The Critical section
+ */
+DECLINLINE(int32_t) RTCritSectGetWaiters(PCRTCRITSECT pCritSect)
+{
+    return pCritSect->cLockers;
+}
+
+/* Lock strict build: Remap the three enter calls to the debug versions. */
+#if defined(RT_LOCK_STRICT) && !defined(RTCRITSECT_WITHOUT_REMAPPING) && !defined(RT_WITH_MANGLING)
+# ifdef IPRT_INCLUDED_asm_h
+#  define RTCritSectEnter(pCritSect)                        RTCritSectEnterDebug(pCritSect, (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
+#  define RTCritSectTryEnter(pCritSect)                     RTCritSectTryEnterDebug(pCritSect, (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
+#  define RTCritSectEnterMultiple(cCritSects, pCritSect)    RTCritSectEnterMultipleDebug((cCritSects), (pCritSect), (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
+# else
+#  define RTCritSectEnter(pCritSect)                        RTCritSectEnterDebug(pCritSect, 0, RT_SRC_POS)
+#  define RTCritSectTryEnter(pCritSect)                     RTCritSectTryEnterDebug(pCritSect, 0, RT_SRC_POS)
+#  define RTCritSectEnterMultiple(cCritSects, pCritSect)    RTCritSectEnterMultipleDebug((cCritSects), (pCritSect), 0, RT_SRC_POS)
+# endif
+#endif
+
+/* Strict lock order: Automatically classify locks by init location. */
+#if defined(RT_LOCK_STRICT_ORDER) && defined(IN_RING3) && !defined(RTCRITSECT_WITHOUT_REMAPPING) && !defined(RT_WITH_MANGLING)
+# define RTCritSectInit(pCritSect) \
+    RTCritSectInitEx((pCritSect), 0 /*fFlags*/, \
+                     RTLockValidatorClassForSrcPos(RT_SRC_POS, NULL), \
+                     RTLOCKVAL_SUB_CLASS_NONE, NULL)
+#endif
+
+/** @}  */
+
+
+
+/** @defgroup grp_rt_critsectrw     RTCritSectRw - Read/Write Critical Sections
+ * @ingroup grp_rt
+ * @{
+ */
+
+/**
+ * Union that allows us to atomically update both the state and
+ * exclusive owner if the hardware supports cmpxchg16b or similar.
+ */
+typedef union RTCRITSECTRWSTATE
+{
+    struct
+    {
+        /** The state variable.
+         * All accesses are atomic and it bits are defined like this:
+         *      Bits 0..14  - cReads.
+         *      Bit 15      - Unused.
+         *      Bits 16..31 - cWrites.
+         *      Bit 31      - fDirection; 0=Read, 1=Write.
+         *      Bits 32..46 - cWaitingReads
+         *      Bit 47      - Unused.
+         *      Bits 48..62 - cWaitingWrites - doesn't make sense here, not used.
+         *      Bit 63      - Unused.
+         */
+        uint64_t                    u64State;
+        /** The write owner. */
+        RTNATIVETHREAD              hNativeWriter;
+    } s;
+    RTUINT128U                      u128;
+} RTCRITSECTRWSTATE;
+
+
+/**
+ * Read/write critical section.
+ */
+typedef struct RTCRITSECTRW
+{
+    /** Magic used to validate the section state.
+     * RTCRITSECTRW_MAGIC is the value of an initialized & operational section. */
+    volatile uint32_t                   u32Magic;
+
+    /** Indicates whether hEvtRead needs resetting. */
+    bool volatile                       fNeedReset;
+    /** Explicit alignment padding. */
+    bool volatile                       afPadding[1];
+    /** Section flags - the RTCRITSECT_FLAGS_* \#defines. */
+    uint16_t                            fFlags;
+
+    /** The number of reads made by the current writer. */
+    uint32_t volatile                   cWriterReads;
+    /** The number of recursions made by the current writer. (The initial grabbing
+     *  of the lock counts as the first one.) */
+    uint32_t volatile                   cWriteRecursions;
+    /** The core state. */
+    RTCRITSECTRWSTATE volatile          u;
+
+    /** What the writer threads are blocking on. */
+    RTSEMEVENT                          hEvtWrite;
+    /** What the read threads are blocking on when waiting for the writer to
+     * finish. */
+    RTSEMEVENTMULTI                     hEvtRead;
+
+    /** The validator record for the writer. */
+    R3R0PTRTYPE(PRTLOCKVALRECEXCL)      pValidatorWrite;
+    /** The validator record for the readers. */
+    R3R0PTRTYPE(PRTLOCKVALRECSHRD)      pValidatorRead;
+} RTCRITSECTRW;
+AssertCompileSize(RTCRITSECTRW, HC_ARCH_BITS == 32 ? 48 : 64);
+
+/** RTCRITSECTRW::u32Magic value. (Eric Allan Dolphy, Jr.) */
+#define RTCRITSECTRW_MAGIC              UINT32_C(0x19280620)
+/** RTCRITSECTRW::u32Magic dead value. */
+#define RTCRITSECTRW_MAGIC_DEAD         UINT32_C(0x19640629)
+
+/** @name RTCRITSECTRW::u64State values.
+ * @note Using RTCSRW instead of RTCRITSECTRW to save space.
+ * @{ */
+#define RTCSRW_CNT_BITS            15
+#define RTCSRW_CNT_MASK            UINT64_C(0x00007fff)
+
+#define RTCSRW_CNT_RD_SHIFT        0
+#define RTCSRW_CNT_RD_MASK         (RTCSRW_CNT_MASK << RTCSRW_CNT_RD_SHIFT)
+#define RTCSRW_CNT_WR_SHIFT        16
+#define RTCSRW_CNT_WR_MASK         (RTCSRW_CNT_MASK << RTCSRW_CNT_WR_SHIFT)
+
+#define RTCSRW_DIR_SHIFT           31
+#define RTCSRW_DIR_MASK            RT_BIT_64(RTCSRW_DIR_SHIFT)
+#define RTCSRW_DIR_READ            UINT64_C(0)
+#define RTCSRW_DIR_WRITE           UINT64_C(1)
+
+#define RTCSRW_WAIT_CNT_RD_SHIFT   32
+#define RTCSRW_WAIT_CNT_RD_MASK    (RTCSRW_CNT_MASK << RTCSRW_WAIT_CNT_RD_SHIFT)
+/* #define RTCSRW_WAIT_CNT_WR_SHIFT   48 */
+/* #define RTCSRW_WAIT_CNT_WR_MASK    (RTCSRW_CNT_MASK << RTCSRW_WAIT_CNT_WR_SHIFT) */
+/** @} */
+
+#if defined(IN_RING3) || defined(IN_RING0)
+
+/**
+ * Initialize a critical section.
+ */
+RTDECL(int) RTCritSectRwInit(PRTCRITSECTRW pThis);
+
+/**
+ * Initialize a critical section.
+ *
+ * @returns IPRT status code.
+ * @param   pThis           Pointer to the read/write critical section.
+ * @param   fFlags          Flags, any combination of the RTCRITSECT_FLAGS
+ *                          \#defines.
+ * @param   hClass          The class (no reference consumed).  If NIL, no lock
+ *                          order validation will be performed on this lock.
+ * @param   uSubClass       The sub-class.  This is used to define lock order
+ *                          within a class.  RTLOCKVAL_SUB_CLASS_NONE is the
+ *                          recommended value here.
+ * @param   pszNameFmt      Name format string for the lock validator, optional
+ *                          (NULL).  Max length is 32 bytes.
+ * @param   ...             Format string arguments.
+ */
+RTDECL(int) RTCritSectRwInitEx(PRTCRITSECTRW pThis, uint32_t fFlags, RTLOCKVALCLASS hClass, uint32_t uSubClass,
+                               const char *pszNameFmt, ...) RT_IPRT_FORMAT_ATTR_MAYBE_NULL(5, 6);
+
+/**
+ * Changes the lock validator sub-class of the critical section.
+ *
+ * It is recommended to try make sure that nobody is using this critical section
+ * 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   pThis           Pointer to the read/write critical section.
+ * @param   uSubClass       The new sub-class value.
+ */
+RTDECL(uint32_t) RTCritSectRwSetSubClass(PRTCRITSECTRW pThis, uint32_t uSubClass);
+
+
+/**
+ * Enter a critical section with shared (read) access.
+ *
+ * @returns IPRT status code.
+ * @retval  VINF_SUCCESS on success.
+ * @retval  VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
+ * @retval  VERR_SEM_DESTROYED if the critical section is delete before or
+ *          during the operation.
+ * @param   pThis           Pointer to the read/write critical section.
+ */
+RTDECL(int) RTCritSectRwEnterShared(PRTCRITSECTRW pThis);
+
+/**
+ * Enter a critical section with shared (read) access.
+ *
+ * @returns IPRT status code.
+ * @retval  VINF_SUCCESS on success.
+ * @retval  VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
+ * @retval  VERR_SEM_DESTROYED if the critical section is delete before or
+ *          during the operation.
+ *
+ * @param   pThis           Pointer to the read/write critical section.
+ * @param   uId             Where we're entering the section.
+ * @param   SRC_POS         The source position where call is being made from.
+ *                          Use RT_SRC_POS when possible.  Optional.
+ */
+RTDECL(int) RTCritSectRwEnterSharedDebug(PRTCRITSECTRW pThis, RTHCUINTPTR uId, RT_SRC_POS_DECL);
+
+/**
+ * Try enter a critical section with shared (read) access.
+ *
+ * @returns IPRT status code.
+ * @retval  VINF_SUCCESS on success.
+ * @retval  VERR_SEM_BUSY if the critsect was owned.
+ * @retval  VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
+ * @retval  VERR_SEM_DESTROYED if the critical section is delete before or
+ *          during the operation.
+ *
+ * @param   pThis           Pointer to the read/write critical section.
+ */
+RTDECL(int) RTCritSectRwTryEnterShared(PRTCRITSECTRW pThis);
+
+/**
+ * Try enter a critical section with shared (read) access.
+ *
+ * @returns IPRT status code.
+ * @retval  VINF_SUCCESS on success.
+ * @retval  VERR_SEM_BUSY if the critsect was owned.
+ * @retval  VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
+ * @retval  VERR_SEM_DESTROYED if the critical section is delete before or
+ *          during the operation.
+ *
+ * @param   pThis           Pointer to the read/write critical section.
+ * @param   uId             Where we're entering the section.
+ * @param   SRC_POS         The source position where call is being made from.
+ *                          Use RT_SRC_POS when possible.  Optional.
+ */
+RTDECL(int) RTCritSectRwTryEnterSharedDebug(PRTCRITSECTRW pThis, RTHCUINTPTR uId, RT_SRC_POS_DECL);
+
+/**
+ * Leave a critical section held with shared access.
+ *
+ * @returns IPRT status code.
+ * @param   pThis           Pointer to the read/write critical section.
+ */
+RTDECL(int) RTCritSectRwLeaveShared(PRTCRITSECTRW pThis);
+
+
+/**
+ * Enter a critical section with exclusive (write) access.
+ *
+ * @returns IPRT status code.
+ * @retval  VINF_SUCCESS on success.
+ * @retval  VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
+ * @retval  VERR_SEM_DESTROYED if the critical section is delete before or
+ *          during the operation.
+ * @param   pThis           Pointer to the read/write critical section.
+ */
+RTDECL(int) RTCritSectRwEnterExcl(PRTCRITSECTRW pThis);
+
+/**
+ * Enter a critical section with exclusive (write) access.
+ *
+ * @retval  VINF_SUCCESS on success.
+ * @retval  VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
+ * @retval  VERR_SEM_DESTROYED if the critical section is delete before or
+ *          during the operation.
+ *
+ * @param   pThis           Pointer to the read/write critical section.
+ * @param   uId             Where we're entering the section.
+ * @param   SRC_POS         The source position where call is being made from.
+ *                          Use RT_SRC_POS when possible.  Optional.
+ */
+RTDECL(int) RTCritSectRwEnterExclDebug(PRTCRITSECTRW pThis, RTHCUINTPTR uId, RT_SRC_POS_DECL);
+
+/**
+ * Try enter a critical section with exclusive (write) access.
+ *
+ * @returns IPRT status code.
+ * @retval  VINF_SUCCESS on success.
+ * @retval  VERR_SEM_BUSY if the critsect was owned.
+ * @retval  VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
+ * @retval  VERR_SEM_DESTROYED if the critical section is delete before or
+ *          during the operation.
+ *
+ * @param   pThis           Pointer to the read/write critical section.
+ */
+RTDECL(int) RTCritSectRwTryEnterExcl(PRTCRITSECTRW pThis);
+
+/**
+ * Try enter a critical section with exclusive (write) access.
+ *
+ * @returns IPRT status code.
+ * @retval  VINF_SUCCESS on success.
+ * @retval  VERR_SEM_BUSY if the critsect was owned.
+ * @retval  VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
+ * @retval  VERR_SEM_DESTROYED if the critical section is delete before or
+ *          during the operation.
+ *
+ * @param   pThis           Pointer to the read/write critical section.
+ * @param   uId             Where we're entering the section.
+ * @param   SRC_POS         The source position where call is being made from.
+ *                          Use RT_SRC_POS when possible.  Optional.
+ */
+RTDECL(int) RTCritSectRwTryEnterExclDebug(PRTCRITSECTRW pThis, RTHCUINTPTR uId, RT_SRC_POS_DECL);
+
+/**
+ * Leave a critical section held exclusively.
+ *
+ * @returns IPRT status code; VINF_SUCCESS, VERR_NOT_OWNER, VERR_SEM_DESTROYED,
+ *          or VERR_WRONG_ORDER.
+ * @param   pThis           Pointer to the read/write critical section.
+ */
+RTDECL(int) RTCritSectRwLeaveExcl(PRTCRITSECTRW pThis);
+
+
+/**
+ * Deletes a critical section.
+ *
+ * @returns VINF_SUCCESS.
+ * @param   pThis           Pointer to the read/write critical section.
+ */
+RTDECL(int) RTCritSectRwDelete(PRTCRITSECTRW pThis);
+
+/**
+ * Checks the caller is the exclusive (write) owner of the critical section.
+ *
+ * @retval  true if owner.
+ * @retval  false if not owner.
+ * @param   pThis           Pointer to the read/write critical section.
+ */
+RTDECL(bool) RTCritSectRwIsWriteOwner(PRTCRITSECTRW pThis);
+
+/**
+ * Checks if the caller is one of the read owners of the critical section.
+ *
+ * @note    !CAUTION!  This API doesn't work reliably if lock validation isn't
+ *          enabled. Meaning, the answer is not trustworhty unless
+ *          RT_LOCK_STRICT or RTCRITSECTRW_STRICT was defined at build time.
+ *          Also, make sure you do not use RTCRITSECTRW_FLAGS_NO_LOCK_VAL when
+ *          creating the semaphore.  And finally, if you used a locking class,
+ *          don't disable deadlock detection by setting cMsMinDeadlock to
+ *          RT_INDEFINITE_WAIT.
+ *
+ *          In short, only use this for assertions.
+ *
+ * @returns @c true if reader, @c false if not.
+ * @param   pThis           Pointer to the read/write critical section.
+ * @param   fWannaHear      What you'd like to hear when lock validation is not
+ *                          available.  (For avoiding asserting all over the
+ *                          place.)
+ */
+RTDECL(bool) RTCritSectRwIsReadOwner(PRTCRITSECTRW pThis, bool fWannaHear);
+
+/**
+ * Gets the write recursion count.
+ *
+ * @returns The write recursion count (0 if bad critsect).
+ * @param   pThis           Pointer to the read/write critical section.
+ */
+RTDECL(uint32_t) RTCritSectRwGetWriteRecursion(PRTCRITSECTRW pThis);
+
+/**
+ * Gets the read recursion count of the current writer.
+ *
+ * @returns The read recursion count (0 if bad critsect).
+ * @param   pThis           Pointer to the read/write critical section.
+ */
+RTDECL(uint32_t) RTCritSectRwGetWriterReadRecursion(PRTCRITSECTRW pThis);
+
+/**
+ * Gets the current number of reads.
+ *
+ * This includes all read recursions, so it might be higher than the number of
+ * read owners.  It does not include reads done by the current writer.
+ *
+ * @returns The read count (0 if bad critsect).
+ * @param   pThis           Pointer to the read/write critical section.
+ */
+RTDECL(uint32_t) RTCritSectRwGetReadCount(PRTCRITSECTRW pThis);
+
+#endif /* IN_RING3 || IN_RING0 */
+
+/**
+ * Checks if a critical section is initialized or not.
+ *
+ * @retval  true if initialized.
+ * @retval  false if not initialized.
+ * @param   pThis           Pointer to the read/write critical section.
+ */
+DECLINLINE(bool) RTCritSectRwIsInitialized(PCRTCRITSECTRW pThis)
+{
+    return pThis->u32Magic == RTCRITSECTRW_MAGIC;
+}
+
+/* Lock strict build: Remap the three enter calls to the debug versions. */
+#if defined(RT_LOCK_STRICT) && !defined(RTCRITSECTRW_WITHOUT_REMAPPING) && !defined(RT_WITH_MANGLING)
+# ifdef IPRT_INCLUDED_asm_h
+#  define RTCritSectRwEnterExcl(pThis)      RTCritSectRwEnterExclDebug(pThis, (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
+#  define RTCritSectRwTryEnterExcl(pThis)   RTCritSectRwTryEnterExclDebug(pThis, (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
+#  define RTCritSectRwEnterShared(pThis)    RTCritSectRwEnterSharedDebug(pThis, (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
+#  define RTCritSectRwTryEnterShared(pThis) RTCritSectRwTryEnterSharedDebug(pThis, (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
+# else
+#  define RTCritSectRwEnterExcl(pThis)      RTCritSectRwEnterExclDebug(pThis, 0, RT_SRC_POS)
+#  define RTCritSectRwTryEnterExcl(pThis)   RTCritSectRwTryEnterExclDebug(pThis, 0, RT_SRC_POS)
+#  define RTCritSectRwEnterShared(pThis)    RTCritSectRwEnterSharedDebug(pThis, 0, RT_SRC_POS)
+#  define RTCritSectRwTryEnterShared(pThis) RTCritSectRwTryEnterSharedDebug(pThis, 0, RT_SRC_POS)
+# endif
+#endif
+
+/* Strict lock order: Automatically classify locks by init location. */
+#if defined(RT_LOCK_STRICT_ORDER) && defined(IN_RING3) && !defined(RTCRITSECTRW_WITHOUT_REMAPPING) && !defined(RT_WITH_MANGLING)
+# define RTCritSectRwInit(a_pThis) \
+    RTCritSectRwInitEx((a_pThis), 0 /*fFlags*/, \
+                       RTLockValidatorClassForSrcPos(RT_SRC_POS, NULL), \
+                        RTLOCKVAL_SUB_CLASS_NONE, NULL)
+#endif
+
+/** @} */
+
+RT_C_DECLS_END
+
+#endif /* !IPRT_INCLUDED_critsect_h */
+