| 1 | /* $Id: semevent-r0drv-os2.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Single Release Event Semaphores, Ring-0 Driver, OS/2.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Contributed by knut st. osmundsen.
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| 8 | *
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| 9 | * Copyright (C) 2007-2020 Oracle Corporation
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| 10 | *
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| 11 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 12 | * available from http://www.virtualbox.org. This file is free software;
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| 13 | * you can redistribute it and/or modify it under the terms of the GNU
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| 14 | * General Public License (GPL) as published by the Free Software
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| 15 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 16 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 17 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 18 | *
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| 19 | * The contents of this file may alternatively be used under the terms
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| 20 | * of the Common Development and Distribution License Version 1.0
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| 21 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 22 | * VirtualBox OSE distribution, in which case the provisions of the
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| 23 | * CDDL are applicable instead of those of the GPL.
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| 24 | *
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| 25 | * You may elect to license modified versions of this file under the
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| 26 | * terms and conditions of either the GPL or the CDDL or both.
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| 27 | * --------------------------------------------------------------------
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| 28 | *
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| 29 | * This code is based on:
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| 30 | *
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| 31 | * Copyright (c) 2007 knut st. osmundsen <[email protected]>
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| 32 | *
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| 33 | * Permission is hereby granted, free of charge, to any person
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| 34 | * obtaining a copy of this software and associated documentation
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| 35 | * files (the "Software"), to deal in the Software without
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| 36 | * restriction, including without limitation the rights to use,
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| 37 | * copy, modify, merge, publish, distribute, sublicense, and/or sell
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| 38 | * copies of the Software, and to permit persons to whom the
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| 39 | * Software is furnished to do so, subject to the following
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| 40 | * conditions:
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| 41 | *
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| 42 | * The above copyright notice and this permission notice shall be
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| 43 | * included in all copies or substantial portions of the Software.
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| 44 | *
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| 45 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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| 46 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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| 47 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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| 48 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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| 49 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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| 50 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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| 51 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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| 52 | * OTHER DEALINGS IN THE SOFTWARE.
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| 53 | */
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| 54 |
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| 55 |
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| 56 | /*********************************************************************************************************************************
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| 57 | * Header Files *
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| 58 | *********************************************************************************************************************************/
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| 59 | #include "the-os2-kernel.h"
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| 60 | #include "internal/iprt.h"
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| 61 |
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| 62 | #include <iprt/semaphore.h>
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| 63 | #include <iprt/asm.h>
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| 64 | #include <iprt/assert.h>
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| 65 | #include <iprt/err.h>
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| 66 | #include <iprt/mem.h>
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| 67 | #include <iprt/lockvalidator.h>
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| 68 |
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| 69 | #include "internal/magics.h"
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| 70 |
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| 71 |
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| 72 | /*********************************************************************************************************************************
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| 73 | * Structures and Typedefs *
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| 74 | *********************************************************************************************************************************/
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| 75 | /**
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| 76 | * OS/2 event semaphore.
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| 77 | */
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| 78 | typedef struct RTSEMEVENTINTERNAL
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| 79 | {
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| 80 | /** Magic value (RTSEMEVENT_MAGIC). */
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| 81 | uint32_t volatile u32Magic;
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| 82 | /** The number of waiting threads. */
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| 83 | uint32_t volatile cWaiters;
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| 84 | /** Set if the event object is signaled. */
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| 85 | uint8_t volatile fSignaled;
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| 86 | /** The number of threads in the process of waking up. */
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| 87 | uint32_t volatile cWaking;
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| 88 | /** The OS/2 spinlock protecting this structure. */
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| 89 | SpinLock_t Spinlock;
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| 90 | } RTSEMEVENTINTERNAL, *PRTSEMEVENTINTERNAL;
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| 91 |
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| 92 |
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| 93 | RTDECL(int) RTSemEventCreate(PRTSEMEVENT phEventSem)
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| 94 | {
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| 95 | return RTSemEventCreateEx(phEventSem, 0 /*fFlags*/, NIL_RTLOCKVALCLASS, NULL);
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| 96 | }
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| 97 |
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| 98 |
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| 99 | RTDECL(int) RTSemEventCreateEx(PRTSEMEVENT phEventSem, uint32_t fFlags, RTLOCKVALCLASS hClass, const char *pszNameFmt, ...)
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| 100 | {
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| 101 | AssertReturn(!(fFlags & ~(RTSEMEVENT_FLAGS_NO_LOCK_VAL | RTSEMEVENT_FLAGS_BOOTSTRAP_HACK)), VERR_INVALID_PARAMETER);
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| 102 | Assert(!(fFlags & RTSEMEVENT_FLAGS_BOOTSTRAP_HACK) || (fFlags & RTSEMEVENT_FLAGS_NO_LOCK_VAL));
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| 103 | AssertCompile(sizeof(RTSEMEVENTINTERNAL) > sizeof(void *));
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| 104 | AssertPtrReturn(phEventSem, VERR_INVALID_POINTER);
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| 105 | RT_NOREF(hClass, pszNameFmt);
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| 106 |
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| 107 | PRTSEMEVENTINTERNAL pThis = (PRTSEMEVENTINTERNAL)RTMemAlloc(sizeof(*pThis));
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| 108 | if (!pThis)
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| 109 | return VERR_NO_MEMORY;
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| 110 |
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| 111 | pThis->u32Magic = RTSEMEVENT_MAGIC;
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| 112 | pThis->cWaiters = 0;
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| 113 | pThis->cWaking = 0;
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| 114 | pThis->fSignaled = 0;
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| 115 | KernAllocSpinLock(&pThis->Spinlock);
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| 116 |
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| 117 | *phEventSem = pThis;
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| 118 | return VINF_SUCCESS;
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| 119 | }
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| 120 |
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| 121 |
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| 122 | RTDECL(int) RTSemEventDestroy(RTSEMEVENT hEventSem)
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| 123 | {
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| 124 | PRTSEMEVENTINTERNAL pThis = hEventSem;
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| 125 | if (pThis == NIL_RTSEMEVENT)
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| 126 | return VINF_SUCCESS;
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| 127 | AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
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| 128 | AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE);
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| 129 |
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| 130 | KernAcquireSpinLock(&pThis->Spinlock);
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| 131 | ASMAtomicIncU32(&pThis->u32Magic); /* make the handle invalid */
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| 132 | if (pThis->cWaiters > 0)
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| 133 | {
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| 134 | /* abort waiting thread, last man cleans up. */
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| 135 | ASMAtomicXchgU32(&pThis->cWaking, pThis->cWaking + pThis->cWaiters);
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| 136 | ULONG cThreads;
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| 137 | KernWakeup((ULONG)pThis, WAKEUP_DATA | WAKEUP_BOOST, &cThreads, (ULONG)VERR_SEM_DESTROYED);
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| 138 | KernReleaseSpinLock(&pThis->Spinlock);
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| 139 | }
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| 140 | else if (pThis->cWaking)
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| 141 | /* the last waking thread is gonna do the cleanup */
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| 142 | KernReleaseSpinLock(&pThis->Spinlock);
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| 143 | else
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| 144 | {
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| 145 | KernReleaseSpinLock(&pThis->Spinlock);
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| 146 | KernFreeSpinLock(&pThis->Spinlock);
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| 147 | RTMemFree(pThis);
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| 148 | }
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| 149 |
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| 150 | return VINF_SUCCESS;
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| 151 | }
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| 152 |
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| 153 |
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| 154 | RTDECL(int) RTSemEventSignal(RTSEMEVENT hEventSem)
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| 155 | {
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| 156 | PRTSEMEVENTINTERNAL pThis = (PRTSEMEVENTINTERNAL)hEventSem;
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| 157 | AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
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| 158 | AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE);
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| 159 |
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| 160 | KernAcquireSpinLock(&pThis->Spinlock);
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| 161 |
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| 162 | if (pThis->cWaiters > 0)
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| 163 | {
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| 164 | ASMAtomicDecU32(&pThis->cWaiters);
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| 165 | ASMAtomicIncU32(&pThis->cWaking);
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| 166 | ULONG cThreads;
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| 167 | KernWakeup((ULONG)pThis, WAKEUP_DATA | WAKEUP_ONE, &cThreads, VINF_SUCCESS);
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| 168 | if (RT_UNLIKELY(!cThreads))
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| 169 | {
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| 170 | /* shouldn't ever happen on OS/2 */
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| 171 | ASMAtomicXchgU8(&pThis->fSignaled, true);
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| 172 | ASMAtomicDecU32(&pThis->cWaking);
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| 173 | ASMAtomicIncU32(&pThis->cWaiters);
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| 174 | }
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| 175 | }
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| 176 | else
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| 177 | ASMAtomicXchgU8(&pThis->fSignaled, true);
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| 178 |
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| 179 | KernReleaseSpinLock(&pThis->Spinlock);
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| 180 | return VINF_SUCCESS;
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| 181 | }
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| 182 |
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| 183 |
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| 184 | /**
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| 185 | * Worker for RTSemEventWaitEx and RTSemEventWaitExDebug.
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| 186 | *
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| 187 | * @returns VBox status code.
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| 188 | * @param pThis The event semaphore.
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| 189 | * @param fFlags See RTSemEventWaitEx.
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| 190 | * @param uTimeout See RTSemEventWaitEx.
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| 191 | * @param pSrcPos The source code position of the wait.
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| 192 | */
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| 193 | static int rtR0SemEventOs2Wait(PRTSEMEVENTINTERNAL pThis, uint32_t fFlags, uint64_t uTimeout,
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| 194 | PCRTLOCKVALSRCPOS pSrcPos)
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| 195 | {
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| 196 | /*
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| 197 | * Validate and convert input.
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| 198 | */
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| 199 | if (!pThis)
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| 200 | return VERR_INVALID_HANDLE;
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| 201 | AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
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| 202 | AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE);
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| 203 | AssertReturn(RTSEMWAIT_FLAGS_ARE_VALID(fFlags), VERR_INVALID_PARAMETER);
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| 204 |
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| 205 | ULONG cMsTimeout = rtR0SemWaitOs2ConvertTimeout(fFlags, uTimeout);
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| 206 | ULONG fBlock = BLOCK_SPINLOCK;
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| 207 | if (!(fFlags & RTSEMWAIT_FLAGS_INTERRUPTIBLE))
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| 208 | fBlock |= BLOCK_UNINTERRUPTABLE;
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| 209 |
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| 210 | /*
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| 211 | * Do the job.
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| 212 | */
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| 213 | KernAcquireSpinLock(&pThis->Spinlock);
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| 214 |
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| 215 | int rc;
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| 216 | if (pThis->fSignaled)
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| 217 | {
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| 218 | Assert(!pThis->cWaiters);
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| 219 | ASMAtomicXchgU8(&pThis->fSignaled, false);
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| 220 | rc = VINF_SUCCESS;
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| 221 | }
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| 222 | else
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| 223 | {
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| 224 | ASMAtomicIncU32(&pThis->cWaiters);
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| 225 |
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| 226 | ULONG ulData = (ULONG)VERR_INTERNAL_ERROR;
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| 227 | rc = KernBlock((ULONG)pThis, cMsTimeout, fBlock,
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| 228 | &pThis->Spinlock,
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| 229 | &ulData);
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| 230 | switch (rc)
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| 231 | {
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| 232 | case NO_ERROR:
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| 233 | rc = (int)ulData;
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| 234 | Assert(rc == VINF_SUCCESS || rc == VERR_SEM_DESTROYED);
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| 235 | Assert(pThis->cWaking > 0);
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| 236 | if ( !ASMAtomicDecU32(&pThis->cWaking)
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| 237 | && pThis->u32Magic != RTSEMEVENT_MAGIC)
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| 238 | {
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| 239 | /* The event was destroyed (ulData == VINF_SUCCESS if it was after we awoke), as
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| 240 | the last thread do the cleanup. */
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| 241 | KernReleaseSpinLock(&pThis->Spinlock);
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| 242 | KernFreeSpinLock(&pThis->Spinlock);
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| 243 | RTMemFree(pThis);
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| 244 | return rc;
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| 245 | }
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| 246 | break;
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| 247 |
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| 248 | case ERROR_TIMEOUT:
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| 249 | Assert(cMsTimeout != SEM_INDEFINITE_WAIT);
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| 250 | ASMAtomicDecU32(&pThis->cWaiters);
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| 251 | rc = VERR_TIMEOUT;
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| 252 | break;
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| 253 |
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| 254 | case ERROR_INTERRUPT:
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| 255 | Assert(fFlags & RTSEMWAIT_FLAGS_INTERRUPTIBLE);
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| 256 | ASMAtomicDecU32(&pThis->cWaiters);
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| 257 | rc = VERR_INTERRUPTED;
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| 258 | break;
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| 259 |
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| 260 | default:
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| 261 | AssertMsgFailed(("rc=%d\n", rc));
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| 262 | rc = VERR_GENERAL_FAILURE;
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| 263 | break;
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| 264 | }
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| 265 | }
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| 266 |
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| 267 | KernReleaseSpinLock(&pThis->Spinlock);
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| 268 | return rc;
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| 269 | }
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| 270 |
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| 271 |
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| 272 | RTDECL(int) RTSemEventWaitEx(RTSEMEVENT hEventSem, uint32_t fFlags, uint64_t uTimeout)
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| 273 | {
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| 274 | #ifndef RTSEMEVENT_STRICT
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| 275 | return rtR0SemEventOs2Wait(hEventSem, fFlags, uTimeout, NULL);
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| 276 | #else
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| 277 | RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_NORMAL_API();
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| 278 | return rtR0SemEventOs2Wait(hEventSem, fFlags, uTimeout, &SrcPos);
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| 279 | #endif
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| 280 | }
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| 281 |
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| 282 |
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| 283 | RTDECL(int) RTSemEventWaitExDebug(RTSEMEVENT hEventSem, uint32_t fFlags, uint64_t uTimeout,
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| 284 | RTHCUINTPTR uId, RT_SRC_POS_DECL)
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| 285 | {
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| 286 | RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_DEBUG_API();
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| 287 | return rtR0SemEventOs2Wait(hEventSem, fFlags, uTimeout, &SrcPos);
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| 288 | }
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| 289 |
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| 290 |
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| 291 | RTDECL(uint32_t) RTSemEventGetResolution(void)
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| 292 | {
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| 293 | return 32000000; /* 32ms */
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| 294 | }
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| 295 |
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