| 1 | /* $Id: timer-r0drv-os2.cpp 9444 2008-06-05 18:08:17Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * IPRT - Memory Allocation, Ring-0 Driver, OS/2.
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (c) 2007 knut st. osmundsen <[email protected]>
|
|---|
| 8 | *
|
|---|
| 9 | * Permission is hereby granted, free of charge, to any person
|
|---|
| 10 | * obtaining a copy of this software and associated documentation
|
|---|
| 11 | * files (the "Software"), to deal in the Software without
|
|---|
| 12 | * restriction, including without limitation the rights to use,
|
|---|
| 13 | * copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|---|
| 14 | * copies of the Software, and to permit persons to whom the
|
|---|
| 15 | * Software is furnished to do so, subject to the following
|
|---|
| 16 | * conditions:
|
|---|
| 17 | *
|
|---|
| 18 | * The above copyright notice and this permission notice shall be
|
|---|
| 19 | * included in all copies or substantial portions of the Software.
|
|---|
| 20 | *
|
|---|
| 21 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|---|
| 22 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
|
|---|
| 23 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|---|
| 24 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
|
|---|
| 25 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
|
|---|
| 26 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|---|
| 27 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
|
|---|
| 28 | * OTHER DEALINGS IN THE SOFTWARE.
|
|---|
| 29 | */
|
|---|
| 30 |
|
|---|
| 31 |
|
|---|
| 32 | /*******************************************************************************
|
|---|
| 33 | * Header Files *
|
|---|
| 34 | *******************************************************************************/
|
|---|
| 35 | #include "the-os2-kernel.h"
|
|---|
| 36 |
|
|---|
| 37 | #include <iprt/timer.h>
|
|---|
| 38 | #include <iprt/time.h>
|
|---|
| 39 | #include <iprt/spinlock.h>
|
|---|
| 40 | #include <iprt/err.h>
|
|---|
| 41 | #include <iprt/asm.h>
|
|---|
| 42 | #include <iprt/assert.h>
|
|---|
| 43 | #include <iprt/alloc.h>
|
|---|
| 44 |
|
|---|
| 45 | #include "internal/magics.h"
|
|---|
| 46 |
|
|---|
| 47 |
|
|---|
| 48 | /*******************************************************************************
|
|---|
| 49 | * Structures and Typedefs *
|
|---|
| 50 | *******************************************************************************/
|
|---|
| 51 | /**
|
|---|
| 52 | * The internal representation of an OS/2 timer handle.
|
|---|
| 53 | */
|
|---|
| 54 | typedef struct RTTIMER
|
|---|
| 55 | {
|
|---|
| 56 | /** Magic.
|
|---|
| 57 | * This is RTTIMER_MAGIC, but changes to something else before the timer
|
|---|
| 58 | * is destroyed to indicate clearly that thread should exit. */
|
|---|
| 59 | uint32_t volatile u32Magic;
|
|---|
| 60 | /** The next timer in the timer list. */
|
|---|
| 61 | PRTTIMER pNext;
|
|---|
| 62 | /** Flag indicating the the timer is suspended. */
|
|---|
| 63 | uint8_t volatile fSuspended;
|
|---|
| 64 | /** Cleared at the start of timer processing, set when calling pfnTimer.
|
|---|
| 65 | * If any timer changes occures while doing the callback this will be used to resume the cycle. */
|
|---|
| 66 | bool fDone;
|
|---|
| 67 | /** Callback. */
|
|---|
| 68 | PFNRTTIMER pfnTimer;
|
|---|
| 69 | /** User argument. */
|
|---|
| 70 | void *pvUser;
|
|---|
| 71 | /** The timer interval. 0 if one-shot. */
|
|---|
| 72 | uint64_t u64NanoInterval;
|
|---|
| 73 | /** The start of the current run.
|
|---|
| 74 | * This is used to calculate when the timer ought to fire the next time. */
|
|---|
| 75 | uint64_t volatile u64StartTS;
|
|---|
| 76 | /** The start of the current run.
|
|---|
| 77 | * This is used to calculate when the timer ought to fire the next time. */
|
|---|
| 78 | uint64_t volatile u64NextTS;
|
|---|
| 79 | /** The current tick number (since u64StartTS). */
|
|---|
| 80 | uint64_t volatile iTick;
|
|---|
| 81 | } RTTIMER;
|
|---|
| 82 |
|
|---|
| 83 |
|
|---|
| 84 | /*******************************************************************************
|
|---|
| 85 | * Global Variables *
|
|---|
| 86 | *******************************************************************************/
|
|---|
| 87 | /** Spinlock protecting the timers. */
|
|---|
| 88 | static RTSPINLOCK g_Spinlock = NIL_RTSPINLOCK;
|
|---|
| 89 | /** The timer head. */
|
|---|
| 90 | static PRTTIMER volatile g_pTimerHead = NULL;
|
|---|
| 91 | /** The number of active timers. */
|
|---|
| 92 | static uint32_t volatile g_cActiveTimers = 0;
|
|---|
| 93 | /** The number of active timers. */
|
|---|
| 94 | static uint32_t volatile g_cTimers = 0;
|
|---|
| 95 | /** The change number.
|
|---|
| 96 | * This is used to detect list changes during the timer callback loop. */
|
|---|
| 97 | static uint32_t volatile g_u32ChangeNo;
|
|---|
| 98 |
|
|---|
| 99 |
|
|---|
| 100 | /*******************************************************************************
|
|---|
| 101 | * Internal Functions *
|
|---|
| 102 | *******************************************************************************/
|
|---|
| 103 | __BEGIN_DECLS
|
|---|
| 104 | DECLASM(void) rtTimerOs2Tick(void);
|
|---|
| 105 | DECLASM(int) rtTimerOs2Arm(void);
|
|---|
| 106 | DECLASM(int) rtTimerOs2Dearm(void);
|
|---|
| 107 | __END_DECLS
|
|---|
| 108 |
|
|---|
| 109 |
|
|---|
| 110 |
|
|---|
| 111 | RTDECL(int) RTTimerCreateEx(PRTTIMER *ppTimer, uint64_t u64NanoInterval, unsigned fFlags, PFNRTTIMER pfnTimer, void *pvUser)
|
|---|
| 112 | {
|
|---|
| 113 | *ppTimer = NULL;
|
|---|
| 114 |
|
|---|
| 115 | /*
|
|---|
| 116 | * We don't support the fancy MP features.
|
|---|
| 117 | */
|
|---|
| 118 | if (fFlags & RTTIMER_FLAGS_CPU_SPECIFIC)
|
|---|
| 119 | return VERR_NOT_SUPPORTED;
|
|---|
| 120 |
|
|---|
| 121 | /*
|
|---|
| 122 | * Lazy initialize the spinlock.
|
|---|
| 123 | */
|
|---|
| 124 | if (g_Spinlock == NIL_RTSPINLOCK)
|
|---|
| 125 | {
|
|---|
| 126 | RTSPINLOCK Spinlock;
|
|---|
| 127 | int rc = RTSpinlockCreate(&Spinlock);
|
|---|
| 128 | AssertRCReturn(rc, rc);
|
|---|
| 129 | //bool fRc;
|
|---|
| 130 | //ASMAtomicCmpXchgSize(&g_Spinlock, Spinlock, NIL_RTSPINLOCK, fRc);
|
|---|
| 131 | //if (!fRc)
|
|---|
| 132 | if (!ASMAtomicCmpXchgPtr((void * volatile *)&g_Spinlock, Spinlock, NIL_RTSPINLOCK))
|
|---|
| 133 | RTSpinlockDestroy(Spinlock);
|
|---|
| 134 | }
|
|---|
| 135 |
|
|---|
| 136 | /*
|
|---|
| 137 | * Allocate and initialize the timer handle.
|
|---|
| 138 | */
|
|---|
| 139 | PRTTIMER pTimer = (PRTTIMER)RTMemAlloc(sizeof(*pTimer));
|
|---|
| 140 | if (!pTimer)
|
|---|
| 141 | return VERR_NO_MEMORY;
|
|---|
| 142 |
|
|---|
| 143 | pTimer->u32Magic = RTTIMER_MAGIC;
|
|---|
| 144 | pTimer->pNext = NULL;
|
|---|
| 145 | pTimer->fSuspended = true;
|
|---|
| 146 | pTimer->pfnTimer = pfnTimer;
|
|---|
| 147 | pTimer->pvUser = pvUser;
|
|---|
| 148 | pTimer->u64NanoInterval = u64NanoInterval;
|
|---|
| 149 | pTimer->u64StartTS = 0;
|
|---|
| 150 |
|
|---|
| 151 | /*
|
|---|
| 152 | * Insert the timer into the list (LIFO atm).
|
|---|
| 153 | */
|
|---|
| 154 | RTSPINLOCKTMP Tmp = RTSPINLOCKTMP_INITIALIZER;
|
|---|
| 155 | RTSpinlockAcquireNoInts(g_Spinlock, &Tmp);
|
|---|
| 156 | g_u32ChangeNo++;
|
|---|
| 157 | pTimer->pNext = g_pTimerHead;
|
|---|
| 158 | g_pTimerHead = pTimer;
|
|---|
| 159 | g_cTimers++;
|
|---|
| 160 | RTSpinlockReleaseNoInts(g_Spinlock, &Tmp);
|
|---|
| 161 |
|
|---|
| 162 | *ppTimer = pTimer;
|
|---|
| 163 | return VINF_SUCCESS;
|
|---|
| 164 | }
|
|---|
| 165 |
|
|---|
| 166 |
|
|---|
| 167 | /**
|
|---|
| 168 | * Validates the timer handle.
|
|---|
| 169 | *
|
|---|
| 170 | * @returns true if valid, false if invalid.
|
|---|
| 171 | * @param pTimer The handle.
|
|---|
| 172 | */
|
|---|
| 173 | DECLINLINE(bool) rtTimerIsValid(PRTTIMER pTimer)
|
|---|
| 174 | {
|
|---|
| 175 | AssertReturn(VALID_PTR(pTimer), false);
|
|---|
| 176 | AssertReturn(pTimer->u32Magic == RTTIMER_MAGIC, false);
|
|---|
| 177 | return true;
|
|---|
| 178 | }
|
|---|
| 179 |
|
|---|
| 180 |
|
|---|
| 181 | RTDECL(int) RTTimerDestroy(PRTTIMER pTimer)
|
|---|
| 182 | {
|
|---|
| 183 | /* It's ok to pass NULL pointer. */
|
|---|
| 184 | if (pTimer == /*NIL_RTTIMER*/ NULL)
|
|---|
| 185 | return VINF_SUCCESS;
|
|---|
| 186 | if (!rtTimerIsValid(pTimer))
|
|---|
| 187 | return VERR_INVALID_HANDLE;
|
|---|
| 188 |
|
|---|
| 189 | /*
|
|---|
| 190 | * Remove it from the list.
|
|---|
| 191 | */
|
|---|
| 192 | RTSPINLOCKTMP Tmp = RTSPINLOCKTMP_INITIALIZER;
|
|---|
| 193 | RTSpinlockAcquireNoInts(g_Spinlock, &Tmp);
|
|---|
| 194 | g_u32ChangeNo++;
|
|---|
| 195 | if (g_pTimerHead == pTimer)
|
|---|
| 196 | g_pTimerHead = pTimer->pNext;
|
|---|
| 197 | else
|
|---|
| 198 | {
|
|---|
| 199 | PRTTIMER pPrev = g_pTimerHead;
|
|---|
| 200 | while (pPrev->pNext != pTimer)
|
|---|
| 201 | {
|
|---|
| 202 | pPrev = pPrev->pNext;
|
|---|
| 203 | if (RT_UNLIKELY(!pPrev))
|
|---|
| 204 | {
|
|---|
| 205 | RTSpinlockReleaseNoInts(g_Spinlock, &Tmp);
|
|---|
| 206 | return VERR_INVALID_HANDLE;
|
|---|
| 207 | }
|
|---|
| 208 | }
|
|---|
| 209 | pPrev->pNext = pTimer->pNext;
|
|---|
| 210 | }
|
|---|
| 211 | Assert(g_cTimers > 0);
|
|---|
| 212 | g_cTimers--;
|
|---|
| 213 | if (!pTimer->fSuspended)
|
|---|
| 214 | {
|
|---|
| 215 | Assert(g_cActiveTimers > 0);
|
|---|
| 216 | g_cActiveTimers--;
|
|---|
| 217 | if (!g_cActiveTimers)
|
|---|
| 218 | rtTimerOs2Dearm();
|
|---|
| 219 | }
|
|---|
| 220 | RTSpinlockReleaseNoInts(g_Spinlock, &Tmp);
|
|---|
| 221 |
|
|---|
| 222 | /*
|
|---|
| 223 | * Free the associated resources.
|
|---|
| 224 | */
|
|---|
| 225 | pTimer->u32Magic++;
|
|---|
| 226 | RTMemFree(pTimer);
|
|---|
| 227 | return VINF_SUCCESS;
|
|---|
| 228 | }
|
|---|
| 229 |
|
|---|
| 230 |
|
|---|
| 231 | RTDECL(int) RTTimerStart(PRTTIMER pTimer, uint64_t u64First)
|
|---|
| 232 | {
|
|---|
| 233 | if (!rtTimerIsValid(pTimer))
|
|---|
| 234 | return VERR_INVALID_HANDLE;
|
|---|
| 235 | if (!pTimer->fSuspended)
|
|---|
| 236 | return VERR_TIMER_ACTIVE;
|
|---|
| 237 |
|
|---|
| 238 | /*
|
|---|
| 239 | * Calc when it should start fireing and give the thread a kick so it get going.
|
|---|
| 240 | */
|
|---|
| 241 | u64First += RTTimeNanoTS();
|
|---|
| 242 |
|
|---|
| 243 | RTSPINLOCKTMP Tmp = RTSPINLOCKTMP_INITIALIZER;
|
|---|
| 244 | RTSpinlockAcquireNoInts(g_Spinlock, &Tmp);
|
|---|
| 245 | g_u32ChangeNo++;
|
|---|
| 246 | if (!g_cActiveTimers)
|
|---|
| 247 | {
|
|---|
| 248 | int rc = rtTimerOs2Arm();
|
|---|
| 249 | if (RT_FAILURE(rc))
|
|---|
| 250 | {
|
|---|
| 251 | RTSpinlockReleaseNoInts(g_Spinlock, &Tmp);
|
|---|
| 252 | return rc;
|
|---|
| 253 | }
|
|---|
| 254 | }
|
|---|
| 255 | g_cActiveTimers++;
|
|---|
| 256 | pTimer->fSuspended = false;
|
|---|
| 257 | pTimer->fDone = true; /* next tick, not current! */
|
|---|
| 258 | pTimer->iTick = 0;
|
|---|
| 259 | pTimer->u64StartTS = u64First;
|
|---|
| 260 | pTimer->u64NextTS = u64First;
|
|---|
| 261 | RTSpinlockReleaseNoInts(g_Spinlock, &Tmp);
|
|---|
| 262 |
|
|---|
| 263 | return VINF_SUCCESS;
|
|---|
| 264 | }
|
|---|
| 265 |
|
|---|
| 266 |
|
|---|
| 267 | RTDECL(int) RTTimerStop(PRTTIMER pTimer)
|
|---|
| 268 | {
|
|---|
| 269 | if (!rtTimerIsValid(pTimer))
|
|---|
| 270 | return VERR_INVALID_HANDLE;
|
|---|
| 271 | if (pTimer->fSuspended)
|
|---|
| 272 | return VERR_TIMER_SUSPENDED;
|
|---|
| 273 |
|
|---|
| 274 | /*
|
|---|
| 275 | * Suspend the timer.
|
|---|
| 276 | */
|
|---|
| 277 | RTSPINLOCKTMP Tmp = RTSPINLOCKTMP_INITIALIZER;
|
|---|
| 278 | RTSpinlockAcquireNoInts(g_Spinlock, &Tmp);
|
|---|
| 279 | g_u32ChangeNo++;
|
|---|
| 280 | pTimer->fSuspended = true;
|
|---|
| 281 | Assert(g_cActiveTimers > 0);
|
|---|
| 282 | g_cActiveTimers--;
|
|---|
| 283 | if (!g_cActiveTimers)
|
|---|
| 284 | rtTimerOs2Dearm();
|
|---|
| 285 | RTSpinlockReleaseNoInts(g_Spinlock, &Tmp);
|
|---|
| 286 |
|
|---|
| 287 | return VINF_SUCCESS;
|
|---|
| 288 | }
|
|---|
| 289 |
|
|---|
| 290 |
|
|---|
| 291 | DECLASM(void) rtTimerOs2Tick(void)
|
|---|
| 292 | {
|
|---|
| 293 | /*
|
|---|
| 294 | * Query the current time and then take the lock.
|
|---|
| 295 | */
|
|---|
| 296 | const uint64_t u64NanoTS = RTTimeNanoTS();
|
|---|
| 297 |
|
|---|
| 298 | RTSPINLOCKTMP Tmp = RTSPINLOCKTMP_INITIALIZER;
|
|---|
| 299 | RTSpinlockAcquireNoInts(g_Spinlock, &Tmp);
|
|---|
| 300 |
|
|---|
| 301 | /*
|
|---|
| 302 | * Clear the fDone flag.
|
|---|
| 303 | */
|
|---|
| 304 | PRTTIMER pTimer;
|
|---|
| 305 | for (pTimer = g_pTimerHead; pTimer; pTimer = pTimer->pNext)
|
|---|
| 306 | pTimer->fDone = false;
|
|---|
| 307 |
|
|---|
| 308 | /*
|
|---|
| 309 | * Walk the timer list and do the callbacks for any active timer.
|
|---|
| 310 | */
|
|---|
| 311 | uint32_t u32CurChangeNo = g_u32ChangeNo;
|
|---|
| 312 | pTimer = g_pTimerHead;
|
|---|
| 313 | while (pTimer)
|
|---|
| 314 | {
|
|---|
| 315 | PRTTIMER pNext = pTimer->pNext;
|
|---|
| 316 | if ( !pTimer->fSuspended
|
|---|
| 317 | && !pTimer->fDone
|
|---|
| 318 | && pTimer->u64NextTS <= u64NanoTS)
|
|---|
| 319 | {
|
|---|
| 320 | pTimer->fDone = true;
|
|---|
| 321 | pTimer->iTick++;
|
|---|
| 322 |
|
|---|
| 323 | /* calculate the next timeout */
|
|---|
| 324 | if (!pTimer->u64NanoInterval)
|
|---|
| 325 | pTimer->fSuspended = true;
|
|---|
| 326 | else
|
|---|
| 327 | {
|
|---|
| 328 | pTimer->u64NextTS = pTimer->u64StartTS + pTimer->iTick * pTimer->u64NanoInterval;
|
|---|
| 329 | if (pTimer->u64NextTS < u64NanoTS)
|
|---|
| 330 | pTimer->u64NextTS = u64NanoTS + RTTimerGetSystemGranularity() / 2;
|
|---|
| 331 | }
|
|---|
| 332 |
|
|---|
| 333 | /* do the callout */
|
|---|
| 334 | PFNRTTIMER pfnTimer = pTimer->pfnTimer;
|
|---|
| 335 | void *pvUser = pTimer->pvUser;
|
|---|
| 336 | RTSpinlockReleaseNoInts(g_Spinlock, &Tmp);
|
|---|
| 337 | pfnTimer(pTimer, pvUser, pTimer->iTick);
|
|---|
| 338 |
|
|---|
| 339 | RTSpinlockAcquireNoInts(g_Spinlock, &Tmp);
|
|---|
| 340 |
|
|---|
| 341 | /* check if anything changed. */
|
|---|
| 342 | if (u32CurChangeNo != g_u32ChangeNo)
|
|---|
| 343 | {
|
|---|
| 344 | u32CurChangeNo = g_u32ChangeNo;
|
|---|
| 345 | pNext = g_pTimerHead;
|
|---|
| 346 | }
|
|---|
| 347 | }
|
|---|
| 348 |
|
|---|
| 349 | /* next */
|
|---|
| 350 | pTimer = pNext;
|
|---|
| 351 | }
|
|---|
| 352 |
|
|---|
| 353 | RTSpinlockReleaseNoInts(g_Spinlock, &Tmp);
|
|---|
| 354 | }
|
|---|
| 355 |
|
|---|
| 356 |
|
|---|
| 357 | RTDECL(uint32_t) RTTimerGetSystemGranularity(void)
|
|---|
| 358 | {
|
|---|
| 359 | return 32000000; /* 32ms */
|
|---|
| 360 | }
|
|---|
| 361 |
|
|---|
| 362 |
|
|---|
| 363 | RTDECL(int) RTTimerRequestSystemGranularity(uint32_t u32Request, uint32_t *pu32Granted)
|
|---|
| 364 | {
|
|---|
| 365 | return VERR_NOT_SUPPORTED;
|
|---|
| 366 | }
|
|---|
| 367 |
|
|---|
| 368 |
|
|---|
| 369 | RTDECL(int) RTTimerReleaseSystemGranularity(uint32_t u32Granted)
|
|---|
| 370 | {
|
|---|
| 371 | return VERR_NOT_SUPPORTED;
|
|---|
| 372 | }
|
|---|
| 373 |
|
|---|
