| 1 | /* $Id: semevent-r0drv-solaris.c 22991 2009-09-14 10:16:08Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Semaphores, Ring-0 Driver, Solaris.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2007 Sun Microsystems, Inc.
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | *
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| 26 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
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| 27 | * Clara, CA 95054 USA or visit http://www.sun.com if you need
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| 28 | * additional information or have any questions.
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| 29 | */
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| 30 |
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| 31 |
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| 32 | /*******************************************************************************
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| 33 | * Header Files *
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| 34 | *******************************************************************************/
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| 35 | #include "the-solaris-kernel.h"
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| 36 | #include "internal/iprt.h"
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| 37 | #include <iprt/semaphore.h>
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| 38 |
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| 39 | #include <iprt/assert.h>
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| 40 | #include <iprt/asm.h>
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| 41 | #include <iprt/err.h>
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| 42 | #include <iprt/mem.h>
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| 43 | #include <iprt/mp.h>
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| 44 | #include <iprt/thread.h>
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| 45 | #include "internal/magics.h"
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| 46 |
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| 47 |
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| 48 | /*******************************************************************************
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| 49 | * Structures and Typedefs *
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| 50 | *******************************************************************************/
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| 51 | /**
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| 52 | * Solaris event semaphore.
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| 53 | */
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| 54 | typedef struct RTSEMEVENTINTERNAL
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| 55 | {
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| 56 | /** Magic value (RTSEMEVENT_MAGIC). */
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| 57 | uint32_t volatile u32Magic;
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| 58 | /** The number of waiting threads. */
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| 59 | uint32_t volatile cWaiters;
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| 60 | /** Set if the event object is signaled. */
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| 61 | uint8_t volatile fSignaled;
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| 62 | /** The number of threads in the process of waking up. */
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| 63 | uint32_t volatile cWaking;
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| 64 | /** The Solaris mutex protecting this structure and pairing up the with the cv. */
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| 65 | kmutex_t Mtx;
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| 66 | /** The Solaris condition variable. */
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| 67 | kcondvar_t Cnd;
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| 68 | } RTSEMEVENTINTERNAL, *PRTSEMEVENTINTERNAL;
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| 69 |
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| 70 |
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| 71 |
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| 72 | RTDECL(int) RTSemEventCreate(PRTSEMEVENT pEventSem)
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| 73 | {
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| 74 | Assert(sizeof(RTSEMEVENTINTERNAL) > sizeof(void *));
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| 75 | AssertPtrReturn(pEventSem, VERR_INVALID_POINTER);
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| 76 | RT_ASSERT_PREEMPTIBLE();
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| 77 |
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| 78 | PRTSEMEVENTINTERNAL pEventInt = (PRTSEMEVENTINTERNAL)RTMemAlloc(sizeof(*pEventInt));
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| 79 | if (pEventInt)
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| 80 | {
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| 81 | pEventInt->u32Magic = RTSEMEVENT_MAGIC;
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| 82 | pEventInt->cWaiters = 0;
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| 83 | pEventInt->cWaking = 0;
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| 84 | pEventInt->fSignaled = 0;
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| 85 | mutex_init(&pEventInt->Mtx, "IPRT Event Semaphore", MUTEX_DRIVER, (void *)ipltospl(DISP_LEVEL));
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| 86 | cv_init(&pEventInt->Cnd, "IPRT CV", CV_DRIVER, NULL);
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| 87 | *pEventSem = pEventInt;
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| 88 | return VINF_SUCCESS;
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| 89 | }
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| 90 | return VERR_NO_MEMORY;
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| 91 | }
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| 92 |
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| 93 |
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| 94 | RTDECL(int) RTSemEventDestroy(RTSEMEVENT EventSem)
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| 95 | {
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| 96 | if (EventSem == NIL_RTSEMEVENT)
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| 97 | return VERR_INVALID_HANDLE;
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| 98 | PRTSEMEVENTINTERNAL pEventInt = (PRTSEMEVENTINTERNAL)EventSem;
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| 99 | AssertPtrReturn(pEventInt, VERR_INVALID_HANDLE);
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| 100 | AssertMsgReturn(pEventInt->u32Magic == RTSEMEVENT_MAGIC,
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| 101 | ("pEventInt=%p u32Magic=%#x\n", pEventInt, pEventInt->u32Magic),
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| 102 | VERR_INVALID_HANDLE);
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| 103 | RT_ASSERT_INTS_ON();
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| 104 |
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| 105 | mutex_enter(&pEventInt->Mtx);
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| 106 | ASMAtomicIncU32(&pEventInt->u32Magic); /* make the handle invalid */
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| 107 | if (pEventInt->cWaiters > 0)
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| 108 | {
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| 109 | /* abort waiting thread, last man cleans up. */
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| 110 | ASMAtomicXchgU32(&pEventInt->cWaking, pEventInt->cWaking + pEventInt->cWaiters);
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| 111 | cv_broadcast(&pEventInt->Cnd);
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| 112 | mutex_exit(&pEventInt->Mtx);
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| 113 | }
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| 114 | else if (pEventInt->cWaking)
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| 115 | {
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| 116 | /* the last waking thread is gonna do the cleanup */
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| 117 | mutex_exit(&pEventInt->Mtx);
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| 118 | }
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| 119 | else
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| 120 | {
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| 121 | mutex_exit(&pEventInt->Mtx);
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| 122 | cv_destroy(&pEventInt->Cnd);
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| 123 | mutex_destroy(&pEventInt->Mtx);
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| 124 | RTMemFree(pEventInt);
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| 125 | }
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| 126 |
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| 127 | return VINF_SUCCESS;
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| 128 | }
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| 129 |
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| 130 |
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| 131 | RTDECL(int) RTSemEventSignal(RTSEMEVENT EventSem)
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| 132 | {
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| 133 | PRTSEMEVENTINTERNAL pEventInt = (PRTSEMEVENTINTERNAL)EventSem;
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| 134 | RT_ASSERT_PREEMPT_CPUID_VAR();
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| 135 | AssertPtrReturn(pEventInt, VERR_INVALID_HANDLE);
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| 136 | AssertMsgReturn(pEventInt->u32Magic == RTSEMEVENT_MAGIC,
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| 137 | ("pEventInt=%p u32Magic=%#x\n", pEventInt, pEventInt->u32Magic),
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| 138 | VERR_INVALID_HANDLE);
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| 139 | RT_ASSERT_INTS_ON();
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| 140 |
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| 141 | /*
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| 142 | * If we're in interrupt context we need to unpin the underlying current
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| 143 | * thread as this could lead to a deadlock (see #4259 for the full explanation)
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| 144 | *
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| 145 | * Note! This assumes nobody is using the RTThreadPreemptDisable in an
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| 146 | * interrupt context and expects it to work right. The swtch will
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| 147 | * result in a voluntary preemption. To fix this, we would have to
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| 148 | * do our own counting in RTThreadPreemptDisable/Restore like we do
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| 149 | * on systems which doesn't do preemption (OS/2, linux, ...) and
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| 150 | * check whether preemption was disabled via RTThreadPreemptDisable
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| 151 | * or not and only call swtch if RTThreadPreemptDisable wasn't called.
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| 152 | */
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| 153 | int fAcquired = mutex_tryenter(&pEventInt->Mtx);
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| 154 | if (!fAcquired)
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| 155 | {
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| 156 | if (curthread->t_intr && getpil() < DISP_LEVEL)
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| 157 | {
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| 158 | RTTHREADPREEMPTSTATE PreemptState = RTTHREADPREEMPTSTATE_INITIALIZER;
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| 159 | RTThreadPreemptDisable(&PreemptState);
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| 160 | preempt();
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| 161 | RTThreadPreemptRestore(&PreemptState);
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| 162 | }
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| 163 | mutex_enter(&pEventInt->Mtx);
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| 164 | }
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| 165 |
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| 166 | if (pEventInt->cWaiters > 0)
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| 167 | {
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| 168 | ASMAtomicDecU32(&pEventInt->cWaiters);
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| 169 | ASMAtomicIncU32(&pEventInt->cWaking);
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| 170 | cv_signal(&pEventInt->Cnd);
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| 171 | }
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| 172 | else
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| 173 | ASMAtomicXchgU8(&pEventInt->fSignaled, true);
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| 174 |
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| 175 | mutex_exit(&pEventInt->Mtx);
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| 176 |
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| 177 | RT_ASSERT_PREEMPT_CPUID();
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| 178 | return VINF_SUCCESS;
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| 179 | }
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| 180 |
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| 181 |
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| 182 | static int rtSemEventWait(RTSEMEVENT EventSem, unsigned cMillies, bool fInterruptible)
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| 183 | {
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| 184 | int rc;
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| 185 | PRTSEMEVENTINTERNAL pEventInt = (PRTSEMEVENTINTERNAL)EventSem;
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| 186 | AssertPtrReturn(pEventInt, VERR_INVALID_HANDLE);
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| 187 | AssertMsgReturn(pEventInt->u32Magic == RTSEMEVENT_MAGIC,
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| 188 | ("pEventInt=%p u32Magic=%#x\n", pEventInt, pEventInt->u32Magic),
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| 189 | VERR_INVALID_HANDLE);
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| 190 | if (cMillies)
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| 191 | RT_ASSERT_PREEMPTIBLE();
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| 192 |
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| 193 | mutex_enter(&pEventInt->Mtx);
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| 194 |
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| 195 | if (pEventInt->fSignaled)
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| 196 | {
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| 197 | Assert(!pEventInt->cWaiters);
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| 198 | ASMAtomicXchgU8(&pEventInt->fSignaled, false);
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| 199 | rc = VINF_SUCCESS;
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| 200 | }
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| 201 | else if (!cMillies)
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| 202 | rc = VERR_TIMEOUT;
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| 203 | else
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| 204 | {
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| 205 | ASMAtomicIncU32(&pEventInt->cWaiters);
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| 206 |
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| 207 | /*
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| 208 | * Translate milliseconds into ticks and go to sleep.
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| 209 | */
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| 210 | if (cMillies != RT_INDEFINITE_WAIT)
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| 211 | {
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| 212 | clock_t cTicks = drv_usectohz((clock_t)(cMillies * 1000L));
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| 213 | clock_t timeout = ddi_get_lbolt();
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| 214 | timeout += cTicks;
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| 215 | if (fInterruptible)
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| 216 | rc = cv_timedwait_sig(&pEventInt->Cnd, &pEventInt->Mtx, timeout);
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| 217 | else
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| 218 | rc = cv_timedwait(&pEventInt->Cnd, &pEventInt->Mtx, timeout);
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| 219 | }
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| 220 | else
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| 221 | {
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| 222 | if (fInterruptible)
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| 223 | rc = cv_wait_sig(&pEventInt->Cnd, &pEventInt->Mtx);
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| 224 | else
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| 225 | {
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| 226 | cv_wait(&pEventInt->Cnd, &pEventInt->Mtx);
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| 227 | rc = 1;
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| 228 | }
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| 229 | }
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| 230 |
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| 231 | if (rc > 0)
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| 232 | {
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| 233 | /* Retured due to call to cv_signal() or cv_broadcast() */
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| 234 | if (pEventInt->u32Magic != RTSEMEVENT_MAGIC)
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| 235 | {
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| 236 | rc = VERR_SEM_DESTROYED;
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| 237 | if (!ASMAtomicDecU32(&pEventInt->cWaking))
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| 238 | {
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| 239 | mutex_exit(&pEventInt->Mtx);
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| 240 | cv_destroy(&pEventInt->Cnd);
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| 241 | mutex_destroy(&pEventInt->Mtx);
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| 242 | RTMemFree(pEventInt);
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| 243 | return rc;
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| 244 | }
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| 245 | }
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| 246 |
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| 247 | ASMAtomicDecU32(&pEventInt->cWaking);
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| 248 | rc = VINF_SUCCESS;
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| 249 | }
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| 250 | else if (rc == -1)
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| 251 | {
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| 252 | /* Returned due to timeout being reached */
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| 253 | if (pEventInt->cWaiters > 0)
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| 254 | ASMAtomicDecU32(&pEventInt->cWaiters);
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| 255 | rc = VERR_TIMEOUT;
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| 256 | }
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| 257 | else
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| 258 | {
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| 259 | /* Returned due to pending signal */
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| 260 | if (pEventInt->cWaiters > 0)
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| 261 | ASMAtomicDecU32(&pEventInt->cWaiters);
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| 262 | rc = VERR_INTERRUPTED;
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| 263 | }
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| 264 | }
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| 265 |
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| 266 | mutex_exit(&pEventInt->Mtx);
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| 267 | return rc;
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| 268 | }
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| 269 |
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| 270 |
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| 271 | RTDECL(int) RTSemEventWait(RTSEMEVENT EventSem, unsigned cMillies)
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| 272 | {
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| 273 | return rtSemEventWait(EventSem, cMillies, false /* not interruptible */);
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| 274 | }
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| 275 |
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| 276 |
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| 277 | RTDECL(int) RTSemEventWaitNoResume(RTSEMEVENT EventSem, unsigned cMillies)
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| 278 | {
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| 279 | return rtSemEventWait(EventSem, cMillies, true /* interruptible */);
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| 280 | }
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