| 1 | /* $Id: timer-r0drv-os2.cpp 8245 2008-04-21 17:24:28Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Memory Allocation, 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/timer.h>
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| 38 | #include <iprt/time.h>
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| 39 | #include <iprt/spinlock.h>
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| 40 | #include <iprt/err.h>
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| 41 | #include <iprt/asm.h>
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| 42 | #include <iprt/assert.h>
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| 43 | #include <iprt/alloc.h>
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| 44 |
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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 | * The internal representation of an OS/2 timer handle.
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| 53 | */
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| 54 | typedef struct RTTIMER
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| 55 | {
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| 56 | /** Magic.
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| 57 | * This is RTTIMER_MAGIC, but changes to something else before the timer
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| 58 | * is destroyed to indicate clearly that thread should exit. */
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| 59 | uint32_t volatile u32Magic;
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| 60 | /** The next timer in the timer list. */
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| 61 | PRTTIMER pNext;
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| 62 | /** Flag indicating the the timer is suspended. */
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| 63 | uint8_t volatile fSuspended;
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| 64 | /** Cleared at the start of timer processing, set when calling pfnTimer.
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| 65 | * If any timer changes occures while doing the callback this will be used to resume the cycle. */
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| 66 | bool fDone;
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| 67 | /** Callback. */
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| 68 | PFNRTTIMER pfnTimer;
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| 69 | /** User argument. */
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| 70 | void *pvUser;
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| 71 | /** The timer interval. 0 if one-shot. */
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| 72 | uint64_t u64NanoInterval;
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| 73 | /** The start of the current run.
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| 74 | * This is used to calculate when the timer ought to fire the next time. */
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| 75 | uint64_t volatile u64StartTS;
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| 76 | /** The start of the current run.
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| 77 | * This is used to calculate when the timer ought to fire the next time. */
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| 78 | uint64_t volatile u64NextTS;
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| 79 | /** The current tick number (since u64StartTS). */
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| 80 | uint64_t volatile iTick;
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| 81 | } RTTIMER;
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| 82 |
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| 83 |
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| 84 | /*******************************************************************************
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| 85 | * Global Variables *
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| 86 | *******************************************************************************/
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| 87 | /** Spinlock protecting the timers. */
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| 88 | static RTSPINLOCK g_Spinlock = NIL_RTSPINLOCK;
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| 89 | /** The timer head. */
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| 90 | static PRTTIMER volatile g_pTimerHead = NULL;
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| 91 | /** The number of active timers. */
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| 92 | static uint32_t volatile g_cActiveTimers = 0;
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| 93 | /** The number of active timers. */
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| 94 | static uint32_t volatile g_cTimers = 0;
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| 95 | /** The change number.
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| 96 | * This is used to detect list changes during the timer callback loop. */
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| 97 | static uint32_t volatile g_u32ChangeNo;
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| 98 |
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| 99 |
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| 100 | /*******************************************************************************
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| 101 | * Internal Functions *
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| 102 | *******************************************************************************/
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| 103 | __BEGIN_DECLS
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| 104 | DECLASM(void) rtTimerOs2Tick(void);
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| 105 | DECLASM(int) rtTimerOs2Arm(void);
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| 106 | DECLASM(int) rtTimerOs2Dearm(void);
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| 107 | __END_DECLS
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| 108 |
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| 109 |
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| 110 |
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| 111 | RTDECL(int) RTTimerCreateEx(PRTTIMER *ppTimer, uint64_t u64NanoInterval, unsigned fFlags, PFNRTTIMER pfnTimer, void *pvUser)
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| 112 | {
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| 113 | *ppTimer = NULL;
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| 114 |
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| 115 | /*
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| 116 | * Lazy initialize the spinlock.
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| 117 | */
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| 118 | if (g_Spinlock == NIL_RTSPINLOCK)
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| 119 | {
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| 120 | RTSPINLOCK Spinlock;
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| 121 | int rc = RTSpinlockCreate(&Spinlock);
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| 122 | AssertRCReturn(rc, rc);
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| 123 | //bool fRc;
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| 124 | //ASMAtomicCmpXchgSize(&g_Spinlock, Spinlock, NIL_RTSPINLOCK, fRc);
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| 125 | //if (!fRc)
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| 126 | if (!ASMAtomicCmpXchgPtr((void * volatile *)&g_Spinlock, Spinlock, NIL_RTSPINLOCK))
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| 127 | RTSpinlockDestroy(Spinlock);
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| 128 | }
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| 129 |
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| 130 | /*
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| 131 | * Allocate and initialize the timer handle.
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| 132 | */
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| 133 | PRTTIMER pTimer = (PRTTIMER)RTMemAlloc(sizeof(*pTimer));
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| 134 | if (!pTimer)
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| 135 | return VERR_NO_MEMORY;
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| 136 |
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| 137 | pTimer->u32Magic = RTTIMER_MAGIC;
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| 138 | pTimer->pNext = NULL;
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| 139 | pTimer->fSuspended = true;
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| 140 | pTimer->pfnTimer = pfnTimer;
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| 141 | pTimer->pvUser = pvUser;
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| 142 | pTimer->u64NanoInterval = u64NanoInterval;
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| 143 | pTimer->u64StartTS = 0;
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| 144 |
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| 145 | /*
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| 146 | * Insert the timer into the list (LIFO atm).
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| 147 | */
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| 148 | RTSPINLOCKTMP Tmp = RTSPINLOCKTMP_INITIALIZER;
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| 149 | RTSpinlockAcquireNoInts(g_Spinlock, &Tmp);
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| 150 | g_u32ChangeNo++;
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| 151 | pTimer->pNext = g_pTimerHead;
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| 152 | g_pTimerHead = pTimer;
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| 153 | g_cTimers++;
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| 154 | RTSpinlockReleaseNoInts(g_Spinlock, &Tmp);
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| 155 |
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| 156 | *ppTimer = pTimer;
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| 157 | return VINF_SUCCESS;
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| 158 | }
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| 159 |
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| 160 |
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| 161 | /**
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| 162 | * Validates the timer handle.
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| 163 | *
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| 164 | * @returns true if valid, false if invalid.
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| 165 | * @param pTimer The handle.
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| 166 | */
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| 167 | DECLINLINE(bool) rtTimerIsValid(PRTTIMER pTimer)
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| 168 | {
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| 169 | AssertReturn(VALID_PTR(pTimer), false);
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| 170 | AssertReturn(pTimer->u32Magic == RTTIMER_MAGIC, false);
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| 171 | return true;
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| 172 | }
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| 173 |
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| 174 |
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| 175 | RTDECL(int) RTTimerDestroy(PRTTIMER pTimer)
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| 176 | {
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| 177 | /* It's ok to pass NULL pointer. */
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| 178 | if (pTimer == /*NIL_RTTIMER*/ NULL)
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| 179 | return VINF_SUCCESS;
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| 180 | if (!rtTimerIsValid(pTimer))
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| 181 | return VERR_INVALID_HANDLE;
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| 182 |
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| 183 | /*
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| 184 | * Remove it from the list.
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| 185 | */
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| 186 | RTSPINLOCKTMP Tmp = RTSPINLOCKTMP_INITIALIZER;
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| 187 | RTSpinlockAcquireNoInts(g_Spinlock, &Tmp);
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| 188 | g_u32ChangeNo++;
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| 189 | if (g_pTimerHead == pTimer)
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| 190 | g_pTimerHead = pTimer->pNext;
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| 191 | else
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| 192 | {
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| 193 | PRTTIMER pPrev = g_pTimerHead;
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| 194 | while (pPrev->pNext != pTimer)
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| 195 | {
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| 196 | pPrev = pPrev->pNext;
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| 197 | if (RT_UNLIKELY(!pPrev))
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| 198 | {
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| 199 | RTSpinlockReleaseNoInts(g_Spinlock, &Tmp);
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| 200 | return VERR_INVALID_HANDLE;
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| 201 | }
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| 202 | }
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| 203 | pPrev->pNext = pTimer->pNext;
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| 204 | }
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| 205 | Assert(g_cTimers > 0);
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| 206 | g_cTimers--;
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| 207 | if (!pTimer->fSuspended)
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| 208 | {
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| 209 | Assert(g_cActiveTimers > 0);
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| 210 | g_cActiveTimers--;
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| 211 | if (!g_cActiveTimers)
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| 212 | rtTimerOs2Dearm();
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| 213 | }
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| 214 | RTSpinlockReleaseNoInts(g_Spinlock, &Tmp);
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| 215 |
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| 216 | /*
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| 217 | * Free the associated resources.
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| 218 | */
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| 219 | pTimer->u32Magic++;
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| 220 | RTMemFree(pTimer);
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| 221 | return VINF_SUCCESS;
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| 222 | }
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| 223 |
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| 224 |
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| 225 | RTDECL(int) RTTimerStart(PRTTIMER pTimer, uint64_t u64First)
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| 226 | {
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| 227 | if (!rtTimerIsValid(pTimer))
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| 228 | return VERR_INVALID_HANDLE;
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| 229 | if (!pTimer->fSuspended)
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| 230 | return VERR_TIMER_ACTIVE;
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| 231 |
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| 232 | /*
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| 233 | * Calc when it should start fireing and give the thread a kick so it get going.
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| 234 | */
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| 235 | u64First += RTTimeNanoTS();
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| 236 |
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| 237 | RTSPINLOCKTMP Tmp = RTSPINLOCKTMP_INITIALIZER;
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| 238 | RTSpinlockAcquireNoInts(g_Spinlock, &Tmp);
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| 239 | g_u32ChangeNo++;
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| 240 | if (!g_cActiveTimers)
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| 241 | {
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| 242 | int rc = rtTimerOs2Arm();
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| 243 | if (RT_FAILURE(rc))
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| 244 | {
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| 245 | RTSpinlockReleaseNoInts(g_Spinlock, &Tmp);
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| 246 | return rc;
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| 247 | }
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| 248 | }
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| 249 | g_cActiveTimers++;
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| 250 | pTimer->fSuspended = false;
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| 251 | pTimer->fDone = true; /* next tick, not current! */
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| 252 | pTimer->iTick = 0;
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| 253 | pTimer->u64StartTS = u64First;
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| 254 | pTimer->u64NextTS = u64First;
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| 255 | RTSpinlockReleaseNoInts(g_Spinlock, &Tmp);
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| 256 |
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| 257 | return VINF_SUCCESS;
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| 258 | }
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| 259 |
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| 260 |
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| 261 | RTDECL(int) RTTimerStop(PRTTIMER pTimer)
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| 262 | {
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| 263 | if (!rtTimerIsValid(pTimer))
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| 264 | return VERR_INVALID_HANDLE;
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| 265 | if (pTimer->fSuspended)
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| 266 | return VERR_TIMER_SUSPENDED;
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| 267 |
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| 268 | /*
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| 269 | * Suspend the timer.
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| 270 | */
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| 271 | RTSPINLOCKTMP Tmp = RTSPINLOCKTMP_INITIALIZER;
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| 272 | RTSpinlockAcquireNoInts(g_Spinlock, &Tmp);
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| 273 | g_u32ChangeNo++;
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| 274 | pTimer->fSuspended = true;
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| 275 | Assert(g_cActiveTimers > 0);
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| 276 | g_cActiveTimers--;
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| 277 | if (!g_cActiveTimers)
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| 278 | rtTimerOs2Dearm();
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| 279 | RTSpinlockReleaseNoInts(g_Spinlock, &Tmp);
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| 280 |
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| 281 | return VINF_SUCCESS;
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| 282 | }
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| 283 |
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| 284 |
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| 285 | DECLASM(void) rtTimerOs2Tick(void)
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| 286 | {
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| 287 | /*
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| 288 | * Query the current time and then take the lock.
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| 289 | */
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| 290 | const uint64_t u64NanoTS = RTTimeNanoTS();
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| 291 |
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| 292 | RTSPINLOCKTMP Tmp = RTSPINLOCKTMP_INITIALIZER;
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| 293 | RTSpinlockAcquireNoInts(g_Spinlock, &Tmp);
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| 294 |
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| 295 | /*
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| 296 | * Clear the fDone flag.
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| 297 | */
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| 298 | PRTTIMER pTimer;
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| 299 | for (pTimer = g_pTimerHead; pTimer; pTimer = pTimer->pNext)
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| 300 | pTimer->fDone = false;
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| 301 |
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| 302 | /*
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| 303 | * Walk the timer list and do the callbacks for any active timer.
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| 304 | */
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| 305 | uint32_t u32CurChangeNo = g_u32ChangeNo;
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| 306 | pTimer = g_pTimerHead;
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| 307 | while (pTimer)
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| 308 | {
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| 309 | PRTTIMER pNext = pTimer->pNext;
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| 310 | if ( !pTimer->fSuspended
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| 311 | && !pTimer->fDone
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| 312 | && pTimer->u64NextTS <= u64NanoTS)
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| 313 | {
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| 314 | pTimer->fDone = true;
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| 315 |
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| 316 | /* calculate the next timeout */
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| 317 | if (!pTimer->u64NanoInterval)
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| 318 | pTimer->fSuspended = true;
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| 319 | else
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| 320 | {
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| 321 | pTimer->u64NextTS = pTimer->u64StartTS + pTimer->iTick * pTimer->u64NanoInterval;
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| 322 | if (pTimer->u64NextTS < u64NanoTS)
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| 323 | pTimer->u64NextTS = u64NanoTS + RTTimerGetSystemGranularity() / 2;
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| 324 | }
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| 325 |
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| 326 | /* do the callout */
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| 327 | PFNRTTIMER pfnTimer = pTimer->pfnTimer;
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| 328 | void *pvUser = pTimer->pvUser;
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| 329 | RTSpinlockReleaseNoInts(g_Spinlock, &Tmp);
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| 330 | pfnTimer(pTimer, pvUser);
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| 331 |
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| 332 | RTSpinlockAcquireNoInts(g_Spinlock, &Tmp);
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| 333 |
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| 334 | /* check if anything changed. */
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| 335 | if (u32CurChangeNo != g_u32ChangeNo)
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| 336 | {
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| 337 | u32CurChangeNo = g_u32ChangeNo;
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| 338 | pNext = g_pTimerHead;
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| 339 | }
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| 340 | }
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| 341 |
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| 342 | /* next */
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| 343 | pTimer = pNext;
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| 344 | }
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| 345 |
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| 346 | RTSpinlockReleaseNoInts(g_Spinlock, &Tmp);
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| 347 | }
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| 348 |
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| 349 |
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| 350 | RTDECL(uint32_t) RTTimerGetSystemGranularity(void)
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| 351 | {
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| 352 | return 32000000; /* 32ms */
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| 353 | }
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| 354 |
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| 355 |
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| 356 | RTDECL(int) RTTimerRequestSystemGranularity(uint32_t u32Request, uint32_t *pu32Granted)
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| 357 | {
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| 358 | return VERR_NOT_SUPPORTED;
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| 359 | }
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| 360 |
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| 361 |
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| 362 | RTDECL(int) RTTimerReleaseSystemGranularity(uint32_t u32Granted)
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| 363 | {
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| 364 | return VERR_NOT_SUPPORTED;
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| 365 | }
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| 366 |
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