| 1 | /* $Id: spinlock-r0drv-os2.cpp 57358 2015-08-14 15:16:38Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Spinlocks, 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 | * 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 | /*********************************************************************************************************************************
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| 33 | * Header Files *
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| 34 | *********************************************************************************************************************************/
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| 35 | #include "the-os2-kernel.h"
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| 36 |
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| 37 | #include <iprt/spinlock.h>
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| 38 | #include <iprt/err.h>
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| 39 | #include <iprt/alloc.h>
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| 40 | #include <iprt/assert.h>
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| 41 | #include <iprt/asm.h>
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| 42 | #ifdef RT_STRICT
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| 43 | # include <iprt/asm-amd64-x86.h>
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| 44 | #endif
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| 45 |
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| 46 | #include "internal/magics.h"
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| 47 |
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| 48 |
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| 49 | /*********************************************************************************************************************************
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| 50 | * Structures and Typedefs *
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| 51 | *********************************************************************************************************************************/
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| 52 | /**
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| 53 | * Wrapper for the SpinLock_t type.
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| 54 | */
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| 55 | typedef struct RTSPINLOCKINTERNAL
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| 56 | {
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| 57 | /** Spinlock magic value (RTSPINLOCK_MAGIC). */
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| 58 | uint32_t volatile u32Magic;
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| 59 | /** Spinlock creation flags. */
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| 60 | uint32_t fFlags;
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| 61 | /** The OS/2 spinlock structure. */
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| 62 | SpinLock_t Spinlock;
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| 63 | } RTSPINLOCKINTERNAL, *PRTSPINLOCKINTERNAL;
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| 64 |
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| 65 |
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| 66 | RTDECL(int) RTSpinlockCreate(PRTSPINLOCK pSpinlock, uint32_t fFlags, const char *pszName)
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| 67 | {
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| 68 | AssertReturn(fFlags == RTSPINLOCK_FLAGS_INTERRUPT_SAFE || fFlags == RTSPINLOCK_FLAGS_INTERRUPT_UNSAFE, VERR_INVALID_PARAMETER);
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| 69 |
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| 70 | /*
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| 71 | * Allocate.
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| 72 | */
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| 73 | AssertCompile(sizeof(RTSPINLOCKINTERNAL) > sizeof(void *));
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| 74 | PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)RTMemAlloc(sizeof(*pThis));
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| 75 | if (!pThis)
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| 76 | return VERR_NO_MEMORY;
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| 77 |
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| 78 | /*
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| 79 | * Initialize & return.
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| 80 | */
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| 81 | pThis->u32Magic = RTSPINLOCK_MAGIC;
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| 82 | pThis->fFlags = fFlags;
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| 83 | KernAllocSpinLock(&pThis->Spinlock);
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| 84 | *pSpinlock = pThis;
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| 85 | return VINF_SUCCESS;
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| 86 | }
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| 87 |
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| 88 |
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| 89 | RTDECL(int) RTSpinlockDestroy(RTSPINLOCK Spinlock)
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| 90 | {
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| 91 | /*
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| 92 | * Validate input.
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| 93 | */
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| 94 | PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock;
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| 95 | if (!pThis)
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| 96 | return VERR_INVALID_PARAMETER;
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| 97 | AssertMsgReturn(pThis->u32Magic == RTSPINLOCK_MAGIC,
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| 98 | ("Invalid spinlock %p magic=%#x\n", pThis, pThis->u32Magic),
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| 99 | VERR_INVALID_PARAMETER);
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| 100 |
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| 101 | /*
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| 102 | * Make the lock invalid and release the memory.
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| 103 | */
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| 104 | ASMAtomicIncU32(&pThis->u32Magic);
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| 105 | KernFreeSpinLock(&pThis->Spinlock);
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| 106 | RTMemFree(pThis);
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| 107 | return VINF_SUCCESS;
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| 108 | }
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| 109 |
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| 110 |
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| 111 | RTDECL(void) RTSpinlockAcquire(RTSPINLOCK Spinlock)
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| 112 | {
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| 113 | PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock;
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| 114 | AssertPtr(pThis);
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| 115 | Assert(pThis->u32Magic == RTSPINLOCK_MAGIC);
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| 116 |
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| 117 | KernAcquireSpinLock(&pThis->Spinlock);
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| 118 | Assert(!ASMIntAreEnabled()); /** @todo verify that interrupts are disabled. */
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| 119 | }
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| 120 |
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| 121 |
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| 122 | RTDECL(void) RTSpinlockRelease(RTSPINLOCK Spinlock)
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| 123 | {
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| 124 | PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock;
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| 125 | AssertPtr(pThis);
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| 126 | Assert(pThis->u32Magic == RTSPINLOCK_MAGIC);
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| 127 |
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| 128 | KernReleaseSpinLock(&pThis->Spinlock);
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| 129 | }
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| 130 |
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