| 1 | /* $Id: semfastmutex-r0drv-freebsd.c 8245 2008-04-21 17:24:28Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Fast Mutex Semaphores, Ring-0 Driver, FreeBSD.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (c) 2007 knut st. osmundsen <[email protected]>
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| 8 | *
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| 9 | * Permission is hereby granted, free of charge, to any person
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| 10 | * obtaining a copy of this software and associated documentation
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| 11 | * files (the "Software"), to deal in the Software without
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| 12 | * restriction, including without limitation the rights to use,
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| 13 | * copy, modify, merge, publish, distribute, sublicense, and/or sell
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| 14 | * copies of the Software, and to permit persons to whom the
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| 15 | * Software is furnished to do so, subject to the following
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| 16 | * conditions:
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| 17 | *
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| 18 | * The above copyright notice and this permission notice shall be
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| 19 | * included in all copies or substantial portions of the Software.
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| 20 | *
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| 21 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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| 22 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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| 23 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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| 24 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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| 25 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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| 26 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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| 27 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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| 28 | * OTHER DEALINGS IN THE SOFTWARE.
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| 29 | */
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| 30 |
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| 31 | /*******************************************************************************
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| 32 | * Header Files *
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| 33 | *******************************************************************************/
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| 34 | #include "the-freebsd-kernel.h"
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| 35 |
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| 36 | #include <iprt/semaphore.h>
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| 37 | #include <iprt/err.h>
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| 38 | #include <iprt/alloc.h>
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| 39 | #include <iprt/assert.h>
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| 40 | #include <iprt/asm.h>
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| 41 |
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| 42 | #include "internal/magics.h"
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| 43 |
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| 44 |
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| 45 | /*******************************************************************************
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| 46 | * Structures and Typedefs *
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| 47 | *******************************************************************************/
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| 48 | /**
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| 49 | * Wrapper for the FreeBSD (sleep) mutex.
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| 50 | */
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| 51 | typedef struct RTSEMFASTMUTEXINTERNAL
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| 52 | {
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| 53 | /** Magic value (RTSEMFASTMUTEX_MAGIC). */
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| 54 | uint32_t u32Magic;
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| 55 | /** The FreeBSD (sleep) mutex. */
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| 56 | struct mtx Mtx;
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| 57 | } RTSEMFASTMUTEXINTERNAL, *PRTSEMFASTMUTEXINTERNAL;
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| 58 |
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| 59 |
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| 60 | RTDECL(int) RTSemFastMutexCreate(PRTSEMFASTMUTEX pMutexSem)
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| 61 | {
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| 62 | AssertCompile(sizeof(RTSEMFASTMUTEXINTERNAL) > sizeof(void *));
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| 63 | AssertPtrReturn(pMutexSem, VERR_INVALID_POINTER);
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| 64 |
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| 65 | PRTSEMFASTMUTEXINTERNAL pFastInt = (PRTSEMFASTMUTEXINTERNAL)RTMemAlloc(sizeof(*pFastInt));
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| 66 | if (pFastInt)
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| 67 | {
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| 68 | pFastInt->u32Magic = RTSEMFASTMUTEX_MAGIC;
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| 69 | mtx_init(&pFastInt->Mtx, "IPRT Fast Mutex Semaphore", NULL, MTX_DEF | MTX_RECURSE);
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| 70 | *pMutexSem = pFastInt;
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| 71 | return VINF_SUCCESS;
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| 72 | }
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| 73 | return VERR_NO_MEMORY;
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| 74 | }
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| 75 |
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| 76 |
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| 77 | RTDECL(int) RTSemFastMutexDestroy(RTSEMFASTMUTEX MutexSem)
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| 78 | {
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| 79 | if (MutexSem == NIL_RTSEMFASTMUTEX) /* don't bitch */
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| 80 | return VERR_INVALID_PARAMETER;
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| 81 | PRTSEMFASTMUTEXINTERNAL pFastInt = (PRTSEMFASTMUTEXINTERNAL)MutexSem;
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| 82 | AssertPtrReturn(pFastInt, VERR_INVALID_PARAMETER);
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| 83 | AssertMsgReturn(pFastInt->u32Magic == RTSEMFASTMUTEX_MAGIC,
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| 84 | ("pFastInt->u32Magic=%RX32 pFastInt=%p\n", pFastInt->u32Magic, pFastInt),
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| 85 | VERR_INVALID_PARAMETER);
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| 86 |
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| 87 | ASMAtomicXchgU32(&pFastInt->u32Magic, RTSEMFASTMUTEX_MAGIC_DEAD);
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| 88 | mtx_destroy(&pFastInt->Mtx);
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| 89 | RTMemFree(pFastInt);
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| 90 |
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| 91 | return VINF_SUCCESS;
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| 92 | }
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| 93 |
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| 94 |
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| 95 | RTDECL(int) RTSemFastMutexRequest(RTSEMFASTMUTEX MutexSem)
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| 96 | {
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| 97 | PRTSEMFASTMUTEXINTERNAL pFastInt = (PRTSEMFASTMUTEXINTERNAL)MutexSem;
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| 98 | AssertPtrReturn(pFastInt, VERR_INVALID_PARAMETER);
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| 99 | AssertMsgReturn(pFastInt->u32Magic == RTSEMFASTMUTEX_MAGIC,
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| 100 | ("pFastInt->u32Magic=%RX32 pFastInt=%p\n", pFastInt->u32Magic, pFastInt),
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| 101 | VERR_INVALID_PARAMETER);
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| 102 |
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| 103 | mtx_lock(&pFastInt->Mtx);
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| 104 | return VINF_SUCCESS;
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| 105 | }
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| 106 |
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| 107 |
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| 108 | RTDECL(int) RTSemFastMutexRelease(RTSEMFASTMUTEX MutexSem)
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| 109 | {
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| 110 | PRTSEMFASTMUTEXINTERNAL pFastInt = (PRTSEMFASTMUTEXINTERNAL)MutexSem;
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| 111 | AssertPtrReturn(pFastInt, VERR_INVALID_PARAMETER);
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| 112 | AssertMsgReturn(pFastInt->u32Magic == RTSEMFASTMUTEX_MAGIC,
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| 113 | ("pFastInt->u32Magic=%RX32 pFastInt=%p\n", pFastInt->u32Magic, pFastInt),
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| 114 | VERR_INVALID_PARAMETER);
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| 115 |
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| 116 | mtx_unlock(&pFastInt->Mtx);
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| 117 | return VINF_SUCCESS;
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| 118 | }
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| 119 |
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