cpython/Python/pytime.c at 3.5 · python-emscripten/cpython · GitHub

Repository navigation

History

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

320

321

322

323

324

325

326

327

328

329

330

331

332

333

334

335

336

337

338

339

340

341

342

343

344

345

346

347

348

349

350

351

352

353

354

355

356

357

358

359

360

361

362

363

364

365

366

367

368

369

370

371

372

373

374

375

376

377

378

379

380

381

382

383

384

385

386

387

388

389

390

391

392

393

394

395

396

397

398

399

400

401

402

403

404

405

406

407

408

409

410

411

412

413

414

415

416

417

418

419

420

421

422

423

424

425

426

427

428

429

430

431

432

433

434

435

436

437

438

439

440

441

442

443

444

445

446

447

448

449

450

451

452

453

454

455

456

457

458

459

460

461

462

463

464

465

466

467

468

469

470

471

472

473

474

475

476

477

478

479

480

481

482

483

484

485

486

487

488

489

490

491

492

493

494

495

496

497

498

499

500

501

502

503

504

505

506

507

508

509

510

511

512

513

514

515

516

517

518

519

520

521

522

523

524

525

526

527

528

529

530

531

532

533

534

535

536

537

538

539

540

541

542

543

544

545

546

547

548

549

550

551

552

553

554

555

556

557

558

559

560

561

562

563

564

565

566

567

568

569

570

571

572

573

574

575

576

577

578

579

580

581

582

583

584

585

586

587

588

589

590

591

592

593

594

595

596

597

598

599

600

601

602

603

604

605

606

607

608

609

610

611

612

613

614

615

616

617

618

619

620

621

622

623

624

625

626

627

628

629

630

631

632

633

634

635

636

637

638

639

640

641

642

643

644

645

646

647

648

649

650

651

652

653

654

655

656

657

658

659

660

661

662

663

664

665

666

667

668

669

670

671

672

673

674

675

676

677

678

679

680

681

682

683

684

685

686

687

688

689

690

691

692

693

694

695

696

#include "Python.h"

#ifdef MS_WINDOWS

#include <windows.h>

#endif

#if defined(__APPLE__)

#include <mach/mach_time.h> /* mach_absolute_time(), mach_timebase_info() */

#endif

/* To millisecond (10^-3) */

#define SEC_TO_MS 1000

/* To microseconds (10^-6) */

#define MS_TO_US 1000

#define SEC_TO_US (SEC_TO_MS * MS_TO_US)

/* To nanoseconds (10^-9) */

#define US_TO_NS 1000

#define MS_TO_NS (MS_TO_US * US_TO_NS)

#define SEC_TO_NS (SEC_TO_MS * MS_TO_NS)

/* Conversion from nanoseconds */

#define NS_TO_MS (1000 * 1000)

#define NS_TO_US (1000)

static void

error_time_t_overflow(void)

{

PyErr_SetString(PyExc_OverflowError,

"timestamp out of range for platform time_t");

}

time_t

_PyLong_AsTime_t(PyObject *obj)

{

#if defined(HAVE_LONG_LONG) && SIZEOF_TIME_T == SIZEOF_LONG_LONG

PY_LONG_LONG val;

val = PyLong_AsLongLong(obj);

#else

long val;

assert(sizeof(time_t) <= sizeof(long));

val = PyLong_AsLong(obj);

#endif

if (val == -1 && PyErr_Occurred()) {

if (PyErr_ExceptionMatches(PyExc_OverflowError))

error_time_t_overflow();

return -1;

}

return (time_t)val;

}

PyObject *

_PyLong_FromTime_t(time_t t)

{

#if defined(HAVE_LONG_LONG) && SIZEOF_TIME_T == SIZEOF_LONG_LONG

return PyLong_FromLongLong((PY_LONG_LONG)t);

#else

assert(sizeof(time_t) <= sizeof(long));

return PyLong_FromLong((long)t);

#endif

}

static int

_PyTime_ObjectToDenominator(PyObject *obj, time_t *sec, long *numerator,

double denominator, _PyTime_round_t round)

{

assert(denominator <= LONG_MAX);

if (PyFloat_Check(obj)) {

double d, intpart, err;

/* volatile avoids unsafe optimization on float enabled by gcc -O3 */

volatile double floatpart;

d = PyFloat_AsDouble(obj);

floatpart = modf(d, &intpart);

if (floatpart < 0) {

floatpart = 1.0 + floatpart;

intpart -= 1.0;

}

floatpart *= denominator;

if (round == _PyTime_ROUND_CEILING) {

floatpart = ceil(floatpart);

if (floatpart >= denominator) {

floatpart = 0.0;

intpart += 1.0;

}

else {

floatpart = floor(floatpart);

}

*sec = (time_t)intpart;

err = intpart - (double)*sec;

if (err <= -1.0 || err >= 1.0) {

error_time_t_overflow();

return -1;

}

*numerator = (long)floatpart;

return 0;

}

else {

*sec = _PyLong_AsTime_t(obj);

if (*sec == (time_t)-1 && PyErr_Occurred())

return -1;

*numerator = 0;

return 0;

}

int

_PyTime_ObjectToTime_t(PyObject *obj, time_t *sec, _PyTime_round_t round)

{

if (PyFloat_Check(obj)) {

double d, intpart, err;

d = PyFloat_AsDouble(obj);

if (round == _PyTime_ROUND_CEILING)

d = ceil(d);

else

d = floor(d);

(void)modf(d, &intpart);

*sec = (time_t)intpart;

err = intpart - (double)*sec;

if (err <= -1.0 || err >= 1.0) {

error_time_t_overflow();

return -1;

}

return 0;

}

else {

*sec = _PyLong_AsTime_t(obj);

if (*sec == (time_t)-1 && PyErr_Occurred())

return -1;

return 0;

}

int

_PyTime_ObjectToTimespec(PyObject *obj, time_t *sec, long *nsec,

_PyTime_round_t round)

{

return _PyTime_ObjectToDenominator(obj, sec, nsec, 1e9, round);

}

int

_PyTime_ObjectToTimeval(PyObject *obj, time_t *sec, long *usec,

_PyTime_round_t round)

{

return _PyTime_ObjectToDenominator(obj, sec, usec, 1e6, round);

}

static void

_PyTime_overflow(void)

{

PyErr_SetString(PyExc_OverflowError,

"timestamp too large to convert to C _PyTime_t");

}

_PyTime_t

_PyTime_FromSeconds(int seconds)

{

_PyTime_t t;

/* ensure that integer overflow cannot happen, int type should have 32

bits, whereas _PyTime_t type has at least 64 bits (SEC_TO_MS takes 30

bits). */

assert((seconds >= 0 && seconds <= _PyTime_MAX / SEC_TO_NS)

|| (seconds < 0 && seconds >= _PyTime_MIN / SEC_TO_NS));

t = (_PyTime_t)seconds * SEC_TO_NS;

return t;

}

_PyTime_t

_PyTime_FromNanoseconds(PY_LONG_LONG ns)

{

_PyTime_t t;

assert(sizeof(PY_LONG_LONG) <= sizeof(_PyTime_t));

t = Py_SAFE_DOWNCAST(ns, PY_LONG_LONG, _PyTime_t);

return t;

}

#ifdef HAVE_CLOCK_GETTIME

static int

_PyTime_FromTimespec(_PyTime_t *tp, struct timespec *ts, int raise)

{

_PyTime_t t;

int res = 0;

t = (_PyTime_t)ts->tv_sec * SEC_TO_NS;

if (t / SEC_TO_NS != ts->tv_sec) {

if (raise)

_PyTime_overflow();

res = -1;

}

t += ts->tv_nsec;

*tp = t;

return res;

}

#elif !defined(MS_WINDOWS)

static int

_PyTime_FromTimeval(_PyTime_t *tp, struct timeval *tv, int raise)

{

_PyTime_t t;

int res = 0;

t = (_PyTime_t)tv->tv_sec * SEC_TO_NS;

if (t / SEC_TO_NS != tv->tv_sec) {

if (raise)

_PyTime_overflow();

res = -1;

}

t += (_PyTime_t)tv->tv_usec * US_TO_NS;

*tp = t;

return res;

}

#endif

static int

_PyTime_FromObject(_PyTime_t *t, PyObject *obj, _PyTime_round_t round,

long to_nanoseconds)

{

if (PyFloat_Check(obj)) {

/* volatile avoids unsafe optimization on float enabled by gcc -O3 */

volatile double d, err;

/* convert to a number of nanoseconds */

d = PyFloat_AsDouble(obj);

d *= to_nanoseconds;

if (round == _PyTime_ROUND_CEILING)

d = ceil(d);

else

d = floor(d);

*t = (_PyTime_t)d;

err = d - (double)*t;

if (fabs(err) >= 1.0) {

_PyTime_overflow();

return -1;

}

return 0;

}

else {

#ifdef HAVE_LONG_LONG

PY_LONG_LONG sec;

sec = PyLong_AsLongLong(obj);

assert(sizeof(PY_LONG_LONG) <= sizeof(_PyTime_t));

#else

long sec;

sec = PyLong_AsLong(obj);

assert(sizeof(PY_LONG_LONG) <= sizeof(_PyTime_t));

#endif

if (sec == -1 && PyErr_Occurred()) {

if (PyErr_ExceptionMatches(PyExc_OverflowError))

_PyTime_overflow();

return -1;

}

*t = sec * to_nanoseconds;

if (*t / to_nanoseconds != sec) {

_PyTime_overflow();

return -1;

}

return 0;

}

int

_PyTime_FromSecondsObject(_PyTime_t *t, PyObject *obj, _PyTime_round_t round)

{

return _PyTime_FromObject(t, obj, round, SEC_TO_NS);

}

int

_PyTime_FromMillisecondsObject(_PyTime_t *t, PyObject *obj, _PyTime_round_t round)

{

return _PyTime_FromObject(t, obj, round, MS_TO_NS);

}

double

_PyTime_AsSecondsDouble(_PyTime_t t)

{

_PyTime_t sec, ns;

/* Divide using integers to avoid rounding issues on the integer part.

1e-9 cannot be stored exactly in IEEE 64-bit. */

sec = t / SEC_TO_NS;

ns = t % SEC_TO_NS;

return (double)sec + (double)ns * 1e-9;

}

PyObject *

_PyTime_AsNanosecondsObject(_PyTime_t t)

{

#ifdef HAVE_LONG_LONG

assert(sizeof(PY_LONG_LONG) >= sizeof(_PyTime_t));

return PyLong_FromLongLong((PY_LONG_LONG)t);

#else

assert(sizeof(long) >= sizeof(_PyTime_t));

return PyLong_FromLong((long)t);

#endif

}

static _PyTime_t

_PyTime_Divide(const _PyTime_t t, const _PyTime_t k,

const _PyTime_round_t round)

{

assert(k > 1);

if (round == _PyTime_ROUND_CEILING) {

if (t >= 0)

return (t + k - 1) / k;

else

return t / k;

}

else {

if (t >= 0)

return t / k;

else

return (t - (k - 1)) / k;

}

_PyTime_t

_PyTime_AsMilliseconds(_PyTime_t t, _PyTime_round_t round)

{

return _PyTime_Divide(t, NS_TO_MS, round);

}

_PyTime_t

_PyTime_AsMicroseconds(_PyTime_t t, _PyTime_round_t round)

{

return _PyTime_Divide(t, NS_TO_US, round);

}

static int

_PyTime_AsTimeval_impl(_PyTime_t t, _PyTime_t *p_secs, int *p_us,

_PyTime_round_t round)

{

_PyTime_t secs, ns;

int usec;

int res = 0;

secs = t / SEC_TO_NS;

ns = t % SEC_TO_NS;

usec = (int)_PyTime_Divide(ns, US_TO_NS, round);

if (usec < 0) {

usec += SEC_TO_US;

if (secs != _PyTime_MIN)

secs -= 1;

else

res = -1;

}

else if (usec >= SEC_TO_US) {

usec -= SEC_TO_US;

if (secs != _PyTime_MAX)

secs += 1;

else

res = -1;

}

assert(0 <= usec && usec < SEC_TO_US);

*p_secs = secs;

*p_us = usec;

return res;

}

static int

_PyTime_AsTimevalStruct_impl(_PyTime_t t, struct timeval *tv,

_PyTime_round_t round, int raise)

{

_PyTime_t secs;

int us;

int res;

res = _PyTime_AsTimeval_impl(t, &secs, &us, round);

#ifdef MS_WINDOWS

tv->tv_sec = (long)secs;

#else

tv->tv_sec = secs;

#endif

tv->tv_usec = us;

if (res < 0 || (_PyTime_t)tv->tv_sec != secs) {

if (raise)

error_time_t_overflow();

return -1;

}

return 0;

}

int

_PyTime_AsTimeval(_PyTime_t t, struct timeval *tv, _PyTime_round_t round)

{

return _PyTime_AsTimevalStruct_impl(t, tv, round, 1);

}

int

_PyTime_AsTimeval_noraise(_PyTime_t t, struct timeval *tv, _PyTime_round_t round)

{

return _PyTime_AsTimevalStruct_impl(t, tv, round, 0);

}

int

_PyTime_AsTimevalTime_t(_PyTime_t t, time_t *p_secs, int *us,

_PyTime_round_t round)

{

_PyTime_t secs;

int res;

res = _PyTime_AsTimeval_impl(t, &secs, us, round);

*p_secs = secs;

if (res < 0 || (_PyTime_t)*p_secs != secs) {

error_time_t_overflow();

return -1;

}

return 0;

}

#if defined(HAVE_CLOCK_GETTIME) || defined(HAVE_KQUEUE)

int

_PyTime_AsTimespec(_PyTime_t t, struct timespec *ts)

{

_PyTime_t secs, nsec;

secs = t / SEC_TO_NS;

nsec = t % SEC_TO_NS;

if (nsec < 0) {

nsec += SEC_TO_NS;

secs -= 1;

}

ts->tv_sec = (time_t)secs;

if ((_PyTime_t)ts->tv_sec != secs) {

_PyTime_overflow();

return -1;

}

ts->tv_nsec = nsec;

assert(0 <= ts->tv_nsec && ts->tv_nsec <= 999999999);

return 0;

}

#endif

static int

pygettimeofday(_PyTime_t *tp, _Py_clock_info_t *info, int raise)

{

#ifdef MS_WINDOWS

FILETIME system_time;

ULARGE_INTEGER large;

assert(info == NULL || raise);

GetSystemTimeAsFileTime(&system_time);

large.u.LowPart = system_time.dwLowDateTime;

large.u.HighPart = system_time.dwHighDateTime;

/* 11,644,473,600,000,000,000: number of nanoseconds between

the 1st january 1601 and the 1st january 1970 (369 years + 89 leap

days). */

*tp = large.QuadPart * 100 - 11644473600000000000;

if (info) {

DWORD timeAdjustment, timeIncrement;

BOOL isTimeAdjustmentDisabled, ok;

info->implementation = "GetSystemTimeAsFileTime()";

info->monotonic = 0;

ok = GetSystemTimeAdjustment(&timeAdjustment, &timeIncrement,

&isTimeAdjustmentDisabled);

if (!ok) {

PyErr_SetFromWindowsErr(0);

return -1;

}

info->resolution = timeIncrement * 1e-7;

info->adjustable = 1;

}

#else /* MS_WINDOWS */

int err;

#ifdef HAVE_CLOCK_GETTIME

struct timespec ts;

#else

struct timeval tv;

#endif

assert(info == NULL || raise);

#ifdef HAVE_CLOCK_GETTIME

err = clock_gettime(CLOCK_REALTIME, &ts);

if (err) {

if (raise)

PyErr_SetFromErrno(PyExc_OSError);

return -1;

}

if (_PyTime_FromTimespec(tp, &ts, raise) < 0)

return -1;

if (info) {

struct timespec res;

info->implementation = "clock_gettime(CLOCK_REALTIME)";

info->monotonic = 0;

info->adjustable = 1;

if (clock_getres(CLOCK_REALTIME, &res) == 0)

info->resolution = res.tv_sec + res.tv_nsec * 1e-9;

else

info->resolution = 1e-9;

}

#else /* HAVE_CLOCK_GETTIME */

/* test gettimeofday() */

#ifdef GETTIMEOFDAY_NO_TZ

err = gettimeofday(&tv);

#else

err = gettimeofday(&tv, (struct timezone *)NULL);

#endif

if (err) {

if (raise)

PyErr_SetFromErrno(PyExc_OSError);

return -1;

}

if (_PyTime_FromTimeval(tp, &tv, raise) < 0)

return -1;

if (info) {

info->implementation = "gettimeofday()";

info->resolution = 1e-6;

info->monotonic = 0;

info->adjustable = 1;

}

#endif /* !HAVE_CLOCK_GETTIME */

#endif /* !MS_WINDOWS */

return 0;

}

_PyTime_t

_PyTime_GetSystemClock(void)

{

_PyTime_t t;

if (pygettimeofday(&t, NULL, 0) < 0) {

/* should not happen, _PyTime_Init() checked the clock at startup */

assert(0);

/* use a fixed value instead of a random value from the stack */

t = 0;

}

return t;

}

int

_PyTime_GetSystemClockWithInfo(_PyTime_t *t, _Py_clock_info_t *info)

{

return pygettimeofday(t, info, 1);

}

static int

pymonotonic(_PyTime_t *tp, _Py_clock_info_t *info, int raise)

{

#if defined(MS_WINDOWS)

ULONGLONG result;

assert(info == NULL || raise);

result = GetTickCount64();

*tp = result * MS_TO_NS;

if (*tp / MS_TO_NS != result) {

if (raise) {

_PyTime_overflow();

return -1;

}

/* Hello, time traveler! */

assert(0);

}

if (info) {

DWORD timeAdjustment, timeIncrement;

BOOL isTimeAdjustmentDisabled, ok;

info->implementation = "GetTickCount64()";

info->monotonic = 1;

ok = GetSystemTimeAdjustment(&timeAdjustment, &timeIncrement,

&isTimeAdjustmentDisabled);

if (!ok) {

PyErr_SetFromWindowsErr(0);

return -1;

}

info->resolution = timeIncrement * 1e-7;

info->adjustable = 0;

}

#elif defined(__APPLE__)

static mach_timebase_info_data_t timebase;

uint64_t time;

if (timebase.denom == 0) {

/* According to the Technical Q&A QA1398, mach_timebase_info() cannot

fail: https://developer.apple.com/library/mac/#qa/qa1398/ */

(void)mach_timebase_info(&timebase);

}

time = mach_absolute_time();

/* apply timebase factor */

time *= timebase.numer;

time /= timebase.denom;

*tp = time;

if (info) {

info->implementation = "mach_absolute_time()";

info->resolution = (double)timebase.numer / timebase.denom * 1e-9;

info->monotonic = 1;

info->adjustable = 0;

}

#else

struct timespec ts;

#ifdef CLOCK_HIGHRES

const clockid_t clk_id = CLOCK_HIGHRES;

const char *implementation = "clock_gettime(CLOCK_HIGHRES)";

#else

const clockid_t clk_id = CLOCK_MONOTONIC;

const char *implementation = "clock_gettime(CLOCK_MONOTONIC)";

#endif

assert(info == NULL || raise);

if (clock_gettime(clk_id, &ts) != 0) {

if (raise) {

PyErr_SetFromErrno(PyExc_OSError);

return -1;

}

return -1;

}

if (info) {

struct timespec res;

info->monotonic = 1;

info->implementation = implementation;

info->adjustable = 0;

if (clock_getres(clk_id, &res) != 0) {

PyErr_SetFromErrno(PyExc_OSError);

return -1;

}

info->resolution = res.tv_sec + res.tv_nsec * 1e-9;

}

if (_PyTime_FromTimespec(tp, &ts, raise) < 0)

return -1;

#endif

return 0;

}

_PyTime_t

_PyTime_GetMonotonicClock(void)

{

_PyTime_t t;

if (pymonotonic(&t, NULL, 0) < 0) {

/* should not happen, _PyTime_Init() checked that monotonic clock at

startup */

assert(0);

/* use a fixed value instead of a random value from the stack */

t = 0;

}

return t;

}

int

_PyTime_GetMonotonicClockWithInfo(_PyTime_t *tp, _Py_clock_info_t *info)

{

return pymonotonic(tp, info, 1);

}

int

_PyTime_Init(void)

{

_PyTime_t t;

/* ensure that the system clock works */

if (_PyTime_GetSystemClockWithInfo(&t, NULL) < 0)

return -1;

/* ensure that the operating system provides a monotonic clock */

if (_PyTime_GetMonotonicClockWithInfo(&t, NULL) < 0)

return -1;

/* check that _PyTime_FromSeconds() cannot overflow */

assert(INT_MAX <= _PyTime_MAX / SEC_TO_NS);

assert(INT_MIN >= _PyTime_MIN / SEC_TO_NS);

return 0;

}

cpython/Python/pytime.c at 3.5 · python-emscripten/cpython · GitHub

Repository navigation

Expand file tree

Breadcrumbs

pytime.c

Latest commit

History

Breadcrumbs

pytime.c

File metadata and controls