cpython/Python/pytime.c at 1d1bb95abdcafe92c771fb3dc4722351b032cc24 · python/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

697

698

699

700

701

702

703

704

705

706

707

708

709

710

711

712

713

714

715

716

717

718

719

720

721

722

723

724

725

726

727

728

729

730

731

732

733

734

735

736

737

738

739

740

741

742

743

744

745

746

747

748

749

750

751

752

753

754

755

756

757

758

759

760

761

762

763

764

765

766

767

768

769

770

771

772

773

774

775

776

777

778

779

780

781

782

783

784

785

786

787

788

789

790

791

792

793

794

795

796

797

798

799

800

801

802

803

804

805

806

807

808

809

810

811

812

813

814

815

816

817

818

819

820

821

822

823

824

825

826

827

828

829

830

831

832

833

834

835

836

837

838

839

840

841

842

843

844

845

846

847

848

849

850

851

852

853

854

855

856

857

858

859

860

861

862

863

864

865

866

867

868

869

870

871

872

873

874

875

876

877

878

879

880

881

882

883

884

885

886

887

888

889

890

891

892

893

894

895

896

897

898

899

900

901

902

903

904

905

906

907

908

909

910

911

912

913

914

915

916

917

918

919

920

921

922

923

924

925

926

927

928

929

930

931

932

933

934

935

936

937

938

939

940

941

942

943

944

945

946

947

948

949

950

951

952

953

954

955

956

957

958

959

960

961

962

963

964

965

966

967

968

969

970

971

972

973

974

975

976

977

978

979

980

981

982

983

984

985

986

987

988

989

990

991

992

993

994

995

996

997

998

999

1000

#include "Python.h"

#include "pycore_pymath.h" // _Py_InIntegralTypeRange()

#ifdef MS_WINDOWS

# include <winsock2.h> // struct timeval

#endif

#if defined(__APPLE__)

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

#if defined(__APPLE__) && defined(__has_builtin)

# if __has_builtin(__builtin_available)

# define HAVE_CLOCK_GETTIME_RUNTIME __builtin_available(macOS 10.12, iOS 10.0, tvOS 10.0, watchOS 3.0, *)

# endif

#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)

#define NS_TO_100NS (100)

#if SIZEOF_TIME_T == SIZEOF_LONG_LONG

# define PY_TIME_T_MAX LLONG_MAX

# define PY_TIME_T_MIN LLONG_MIN

#elif SIZEOF_TIME_T == SIZEOF_LONG

# define PY_TIME_T_MAX LONG_MAX

# define PY_TIME_T_MIN LONG_MIN

#else

# error "unsupported time_t size"

#endif

static void

pytime_time_t_overflow(void)

{

PyErr_SetString(PyExc_OverflowError,

"timestamp out of range for platform time_t");

}

static void

pytime_overflow(void)

{

PyErr_SetString(PyExc_OverflowError,

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

}

static inline _PyTime_t

pytime_from_nanoseconds(_PyTime_t t)

{

// _PyTime_t is a number of nanoseconds

return t;

}

static inline _PyTime_t

pytime_as_nanoseconds(_PyTime_t t)

{

// _PyTime_t is a number of nanoseconds: see pytime_from_nanoseconds()

return t;

}

// Compute t1 + t2. Clamp to [_PyTime_MIN; _PyTime_MAX] on overflow.

static inline int

pytime_add(_PyTime_t *t1, _PyTime_t t2)

{

if (t2 > 0 && *t1 > _PyTime_MAX - t2) {

*t1 = _PyTime_MAX;

return -1;

}

else if (t2 < 0 && *t1 < _PyTime_MIN - t2) {

*t1 = _PyTime_MIN;

return -1;

}

else {

*t1 += t2;

return 0;

}

_PyTime_t

_PyTime_Add(_PyTime_t t1, _PyTime_t t2)

{

(void)pytime_add(&t1, t2);

return t1;

}

static inline int

pytime_mul_check_overflow(_PyTime_t a, _PyTime_t b)

{

if (b != 0) {

assert(b > 0);

return ((a < _PyTime_MIN / b) || (_PyTime_MAX / b < a));

}

else {

return 0;

}

// Compute t * k. Clamp to [_PyTime_MIN; _PyTime_MAX] on overflow.

static inline int

pytime_mul(_PyTime_t *t, _PyTime_t k)

{

assert(k >= 0);

if (pytime_mul_check_overflow(*t, k)) {

*t = (*t >= 0) ? _PyTime_MAX : _PyTime_MIN;

return -1;

}

else {

*t *= k;

return 0;

}

// Compute t * k. Clamp to [_PyTime_MIN; _PyTime_MAX] on overflow.

static inline _PyTime_t

_PyTime_Mul(_PyTime_t t, _PyTime_t k)

{

(void)pytime_mul(&t, k);

return t;

}

_PyTime_t

_PyTime_MulDiv(_PyTime_t ticks, _PyTime_t mul, _PyTime_t div)

{

/* Compute (ticks * mul / div) in two parts to reduce the risk of integer

overflow: compute the integer part, and then the remaining part.

(ticks * mul) / div == (ticks / div) * mul + (ticks % div) * mul / div

_PyTime_t intpart, remaining;

intpart = ticks / div;

ticks %= div;

remaining = _PyTime_Mul(ticks, mul) / div;

// intpart * mul + remaining

return _PyTime_Add(_PyTime_Mul(intpart, mul), remaining);

}

time_t

_PyLong_AsTime_t(PyObject *obj)

{

#if SIZEOF_TIME_T == SIZEOF_LONG_LONG

long long val = PyLong_AsLongLong(obj);

#elif SIZEOF_TIME_T <= SIZEOF_LONG

long val = PyLong_AsLong(obj);

#else

# error "unsupported time_t size"

#endif

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

if (PyErr_ExceptionMatches(PyExc_OverflowError)) {

pytime_time_t_overflow();

}

return -1;

}

return (time_t)val;

}

PyObject *

_PyLong_FromTime_t(time_t t)

{

#if SIZEOF_TIME_T == SIZEOF_LONG_LONG

return PyLong_FromLongLong((long long)t);

#elif SIZEOF_TIME_T <= SIZEOF_LONG

return PyLong_FromLong((long)t);

#else

# error "unsupported time_t size"

#endif

}

// Convert _PyTime_t to time_t.

// Return 0 on success. Return -1 and clamp the value on overflow.

static int

_PyTime_AsTime_t(_PyTime_t t, time_t *t2)

{

#if SIZEOF_TIME_T < _SIZEOF_PYTIME_T

if ((_PyTime_t)PY_TIME_T_MAX < t) {

*t2 = PY_TIME_T_MAX;

return -1;

}

if (t < (_PyTime_t)PY_TIME_T_MIN) {

*t2 = PY_TIME_T_MIN;

return -1;

}

#endif

*t2 = (time_t)t;

return 0;

}

#ifdef MS_WINDOWS

// Convert _PyTime_t to long.

// Return 0 on success. Return -1 and clamp the value on overflow.

static int

_PyTime_AsLong(_PyTime_t t, long *t2)

{

#if SIZEOF_LONG < _SIZEOF_PYTIME_T

if ((_PyTime_t)LONG_MAX < t) {

*t2 = LONG_MAX;

return -1;

}

if (t < (_PyTime_t)LONG_MIN) {

*t2 = LONG_MIN;

return -1;

}

#endif

*t2 = (long)t;

return 0;

}

#endif

/* Round to nearest with ties going to nearest even integer

(_PyTime_ROUND_HALF_EVEN) */

static double

pytime_round_half_even(double x)

{

double rounded = round(x);

if (fabs(x-rounded) == 0.5) {

/* halfway case: round to even */

rounded = 2.0 * round(x / 2.0);

}

return rounded;

}

static double

pytime_round(double x, _PyTime_round_t round)

{

/* volatile avoids optimization changing how numbers are rounded */

volatile double d;

d = x;

if (round == _PyTime_ROUND_HALF_EVEN) {

d = pytime_round_half_even(d);

}

else if (round == _PyTime_ROUND_CEILING) {

d = ceil(d);

}

else if (round == _PyTime_ROUND_FLOOR) {

d = floor(d);

}

else {

assert(round == _PyTime_ROUND_UP);

d = (d >= 0.0) ? ceil(d) : floor(d);

}

return d;

}

static int

pytime_double_to_denominator(double d, time_t *sec, long *numerator,

long idenominator, _PyTime_round_t round)

{

double denominator = (double)idenominator;

double intpart;

/* volatile avoids optimization changing how numbers are rounded */

volatile double floatpart;

floatpart = modf(d, &intpart);

floatpart *= denominator;

floatpart = pytime_round(floatpart, round);

if (floatpart >= denominator) {

floatpart -= denominator;

intpart += 1.0;

}

else if (floatpart < 0) {

floatpart += denominator;

intpart -= 1.0;

}

assert(0.0 <= floatpart && floatpart < denominator);

if (!_Py_InIntegralTypeRange(time_t, intpart)) {

pytime_time_t_overflow();

return -1;

}

*sec = (time_t)intpart;

*numerator = (long)floatpart;

assert(0 <= *numerator && *numerator < idenominator);

return 0;

}

static int

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

long denominator, _PyTime_round_t round)

{

assert(denominator >= 1);

if (PyFloat_Check(obj)) {

double d = PyFloat_AsDouble(obj);

if (Py_IS_NAN(d)) {

*numerator = 0;

PyErr_SetString(PyExc_ValueError, "Invalid value NaN (not a number)");

return -1;

}

return pytime_double_to_denominator(d, sec, numerator,

denominator, round);

}

else {

*sec = _PyLong_AsTime_t(obj);

*numerator = 0;

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

return -1;

}

return 0;

}

int

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

{

if (PyFloat_Check(obj)) {

double intpart;

/* volatile avoids optimization changing how numbers are rounded */

volatile double d;

d = PyFloat_AsDouble(obj);

if (Py_IS_NAN(d)) {

PyErr_SetString(PyExc_ValueError, "Invalid value NaN (not a number)");

return -1;

}

d = pytime_round(d, round);

(void)modf(d, &intpart);

if (!_Py_InIntegralTypeRange(time_t, intpart)) {

pytime_time_t_overflow();

return -1;

}

*sec = (time_t)intpart;

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_object_to_denominator(obj, sec, nsec, SEC_TO_NS, round);

}

int

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

_PyTime_round_t round)

{

return pytime_object_to_denominator(obj, sec, usec, SEC_TO_US, round);

}

_PyTime_t

_PyTime_FromSeconds(int seconds)

{

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

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

bits). */

static_assert(INT_MAX <= _PyTime_MAX / SEC_TO_NS, "_PyTime_t overflow");

static_assert(INT_MIN >= _PyTime_MIN / SEC_TO_NS, "_PyTime_t underflow");

_PyTime_t t = (_PyTime_t)seconds;

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

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

t *= SEC_TO_NS;

return pytime_from_nanoseconds(t);

}

_PyTime_t

_PyTime_FromNanoseconds(_PyTime_t ns)

{

return pytime_from_nanoseconds(ns);

}

_PyTime_t

_PyTime_FromMicrosecondsClamp(_PyTime_t us)

{

_PyTime_t ns = _PyTime_Mul(us, US_TO_NS);

return pytime_from_nanoseconds(ns);

}

int

_PyTime_FromNanosecondsObject(_PyTime_t *tp, PyObject *obj)

{

if (!PyLong_Check(obj)) {

PyErr_Format(PyExc_TypeError, "expect int, got %s",

Py_TYPE(obj)->tp_name);

return -1;

}

static_assert(sizeof(long long) == sizeof(_PyTime_t),

"_PyTime_t is not long long");

long long nsec = PyLong_AsLongLong(obj);

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

if (PyErr_ExceptionMatches(PyExc_OverflowError)) {

pytime_overflow();

}

return -1;

}

_PyTime_t t = (_PyTime_t)nsec;

*tp = pytime_from_nanoseconds(t);

return 0;

}

#ifdef HAVE_CLOCK_GETTIME

static int

pytime_fromtimespec(_PyTime_t *tp, struct timespec *ts, int raise_exc)

{

_PyTime_t t, tv_nsec;

static_assert(sizeof(ts->tv_sec) <= sizeof(_PyTime_t),

"timespec.tv_sec is larger than _PyTime_t");

t = (_PyTime_t)ts->tv_sec;

int res1 = pytime_mul(&t, SEC_TO_NS);

tv_nsec = ts->tv_nsec;

int res2 = pytime_add(&t, tv_nsec);

*tp = pytime_from_nanoseconds(t);

if (raise_exc && (res1 < 0 || res2 < 0)) {

pytime_overflow();

return -1;

}

return 0;

}

int

_PyTime_FromTimespec(_PyTime_t *tp, struct timespec *ts)

{

return pytime_fromtimespec(tp, ts, 1);

}

#endif

#ifndef MS_WINDOWS

static int

pytime_fromtimeval(_PyTime_t *tp, struct timeval *tv, int raise_exc)

{

static_assert(sizeof(tv->tv_sec) <= sizeof(_PyTime_t),

"timeval.tv_sec is larger than _PyTime_t");

_PyTime_t t = (_PyTime_t)tv->tv_sec;

int res1 = pytime_mul(&t, SEC_TO_NS);

_PyTime_t usec = (_PyTime_t)tv->tv_usec * US_TO_NS;

int res2 = pytime_add(&t, usec);

*tp = pytime_from_nanoseconds(t);

if (raise_exc && (res1 < 0 || res2 < 0)) {

pytime_overflow();

return -1;

}

return 0;

}

int

_PyTime_FromTimeval(_PyTime_t *tp, struct timeval *tv)

{

return pytime_fromtimeval(tp, tv, 1);

}

#endif

static int

pytime_from_double(_PyTime_t *tp, double value, _PyTime_round_t round,

long unit_to_ns)

{

/* volatile avoids optimization changing how numbers are rounded */

volatile double d;

/* convert to a number of nanoseconds */

d = value;

d *= (double)unit_to_ns;

d = pytime_round(d, round);

if (!_Py_InIntegralTypeRange(_PyTime_t, d)) {

pytime_overflow();

return -1;

}

_PyTime_t ns = (_PyTime_t)d;

*tp = pytime_from_nanoseconds(ns);

return 0;

}

static int

pytime_from_object(_PyTime_t *tp, PyObject *obj, _PyTime_round_t round,

long unit_to_ns)

{

if (PyFloat_Check(obj)) {

double d;

d = PyFloat_AsDouble(obj);

if (Py_IS_NAN(d)) {

PyErr_SetString(PyExc_ValueError, "Invalid value NaN (not a number)");

return -1;

}

return pytime_from_double(tp, d, round, unit_to_ns);

}

else {

long long sec = PyLong_AsLongLong(obj);

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

if (PyErr_ExceptionMatches(PyExc_OverflowError)) {

pytime_overflow();

}

return -1;

}

static_assert(sizeof(long long) <= sizeof(_PyTime_t),

"_PyTime_t is smaller than long long");

_PyTime_t ns = (_PyTime_t)sec;

if (pytime_mul(&ns, unit_to_ns) < 0) {

pytime_overflow();

return -1;

}

*tp = pytime_from_nanoseconds(ns);

return 0;

}

int

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

{

return pytime_from_object(tp, obj, round, SEC_TO_NS);

}

int

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

{

return pytime_from_object(tp, obj, round, MS_TO_NS);

}

double

_PyTime_AsSecondsDouble(_PyTime_t t)

{

/* volatile avoids optimization changing how numbers are rounded */

volatile double d;

_PyTime_t ns = pytime_as_nanoseconds(t);

if (ns % SEC_TO_NS == 0) {

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

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

_PyTime_t secs = ns / SEC_TO_NS;

d = (double)secs;

}

else {

d = (double)ns;

d /= 1e9;

}

return d;

}

PyObject *

_PyTime_AsNanosecondsObject(_PyTime_t t)

{

_PyTime_t ns = pytime_as_nanoseconds(t);

static_assert(sizeof(long long) >= sizeof(_PyTime_t),

"_PyTime_t is larger than long long");

return PyLong_FromLongLong((long long)ns);

}

static _PyTime_t

pytime_divide_round_up(const _PyTime_t t, const _PyTime_t k)

{

assert(k > 1);

if (t >= 0) {

// Don't use (t + k - 1) / k to avoid integer overflow

// if t is equal to _PyTime_MAX

_PyTime_t q = t / k;

if (t % k) {

q += 1;

}

return q;

}

else {

// Don't use (t - (k - 1)) / k to avoid integer overflow

// if t is equals to _PyTime_MIN.

_PyTime_t q = t / k;

if (t % k) {

q -= 1;

}

return q;

}

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_HALF_EVEN) {

_PyTime_t x = t / k;

_PyTime_t r = t % k;

_PyTime_t abs_r = Py_ABS(r);

if (abs_r > k / 2 || (abs_r == k / 2 && (Py_ABS(x) & 1))) {

if (t >= 0) {

x++;

}

else {

x--;

}

return x;

}

else if (round == _PyTime_ROUND_CEILING) {

if (t >= 0) {

return pytime_divide_round_up(t, k);

}

else {

return t / k;

}

else if (round == _PyTime_ROUND_FLOOR){

if (t >= 0) {

return t / k;

}

else {

return pytime_divide_round_up(t, k);

}

else {

assert(round == _PyTime_ROUND_UP);

return pytime_divide_round_up(t, k);

}

// Compute (t / k, t % k) in (pq, pr).

// Make sure that 0 <= pr < k.

// Return 0 on success.

// Return -1 on underflow and store (_PyTime_MIN, 0) in (pq, pr).

static int

pytime_divmod(const _PyTime_t t, const _PyTime_t k,

_PyTime_t *pq, _PyTime_t *pr)

{

assert(k > 1);

_PyTime_t q = t / k;

_PyTime_t r = t % k;

if (r < 0) {

if (q == _PyTime_MIN) {

*pq = _PyTime_MIN;

*pr = 0;

return -1;

}

r += k;

q -= 1;

}

assert(0 <= r && r < k);

*pq = q;

*pr = r;

return 0;

}

_PyTime_t

_PyTime_AsNanoseconds(_PyTime_t t)

{

return pytime_as_nanoseconds(t);

}

#ifdef MS_WINDOWS

_PyTime_t

_PyTime_As100Nanoseconds(_PyTime_t t, _PyTime_round_t round)

{

_PyTime_t ns = pytime_as_nanoseconds(t);

return pytime_divide(ns, NS_TO_100NS, round);

}

#endif

_PyTime_t

_PyTime_AsMicroseconds(_PyTime_t t, _PyTime_round_t round)

{

_PyTime_t ns = pytime_as_nanoseconds(t);

return pytime_divide(ns, NS_TO_US, round);

}

_PyTime_t

_PyTime_AsMilliseconds(_PyTime_t t, _PyTime_round_t round)

{

_PyTime_t ns = pytime_as_nanoseconds(t);

return pytime_divide(ns, NS_TO_MS, round);

}

static int

pytime_as_timeval(_PyTime_t t, _PyTime_t *ptv_sec, int *ptv_usec,

_PyTime_round_t round)

{

_PyTime_t ns = pytime_as_nanoseconds(t);

_PyTime_t us = pytime_divide(ns, US_TO_NS, round);

_PyTime_t tv_sec, tv_usec;

int res = pytime_divmod(us, SEC_TO_US, &tv_sec, &tv_usec);

*ptv_sec = tv_sec;

*ptv_usec = (int)tv_usec;

return res;

}

static int

pytime_as_timeval_struct(_PyTime_t t, struct timeval *tv,

_PyTime_round_t round, int raise_exc)

{

_PyTime_t tv_sec;

int tv_usec;

int res = pytime_as_timeval(t, &tv_sec, &tv_usec, round);

int res2;

#ifdef MS_WINDOWS

// On Windows, timeval.tv_sec type is long

res2 = _PyTime_AsLong(tv_sec, &tv->tv_sec);

#else

res2 = _PyTime_AsTime_t(tv_sec, &tv->tv_sec);

#endif

if (res2 < 0) {

tv_usec = 0;

}

tv->tv_usec = tv_usec;

if (raise_exc && (res < 0 || res2 < 0)) {

pytime_time_t_overflow();

return -1;

}

return 0;

}

int

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

{

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

}

void

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

{

(void)pytime_as_timeval_struct(t, tv, round, 0);

}

int

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

_PyTime_round_t round)

{

_PyTime_t secs;

if (pytime_as_timeval(t, &secs, us, round) < 0) {

pytime_time_t_overflow();

return -1;

}

if (_PyTime_AsTime_t(secs, p_secs) < 0) {

pytime_time_t_overflow();

return -1;

}

return 0;

}

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

static int

pytime_as_timespec(_PyTime_t t, struct timespec *ts, int raise_exc)

{

_PyTime_t ns = pytime_as_nanoseconds(t);

_PyTime_t tv_sec, tv_nsec;

int res = pytime_divmod(ns, SEC_TO_NS, &tv_sec, &tv_nsec);

int res2 = _PyTime_AsTime_t(tv_sec, &ts->tv_sec);

if (res2 < 0) {

tv_nsec = 0;

}

ts->tv_nsec = tv_nsec;

if (raise_exc && (res < 0 || res2 < 0)) {

pytime_time_t_overflow();

return -1;

}

return 0;

}

void

_PyTime_AsTimespec_clamp(_PyTime_t t, struct timespec *ts)

{

(void)pytime_as_timespec(t, ts, 0);

}

int

_PyTime_AsTimespec(_PyTime_t t, struct timespec *ts)

{

return pytime_as_timespec(t, ts, 1);

}

#endif

static int

py_get_system_clock(_PyTime_t *tp, _Py_clock_info_t *info, int raise_exc)

{

assert(info == NULL || raise_exc);

#ifdef MS_WINDOWS

FILETIME system_time;

ULARGE_INTEGER large;

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). */

_PyTime_t ns = large.QuadPart * 100 - 11644473600000000000;

*tp = pytime_from_nanoseconds(ns);

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;

#if defined(HAVE_CLOCK_GETTIME)

struct timespec ts;

#endif

#if !defined(HAVE_CLOCK_GETTIME) || defined(__APPLE__)

struct timeval tv;

#endif

#ifdef HAVE_CLOCK_GETTIME

#ifdef HAVE_CLOCK_GETTIME_RUNTIME

if (HAVE_CLOCK_GETTIME_RUNTIME) {

#endif

err = clock_gettime(CLOCK_REALTIME, &ts);

if (err) {

if (raise_exc) {

PyErr_SetFromErrno(PyExc_OSError);

}

return -1;

}

if (pytime_fromtimespec(tp, &ts, raise_exc) < 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;

}

#ifdef HAVE_CLOCK_GETTIME_RUNTIME

}

else {

#endif

#if !defined(HAVE_CLOCK_GETTIME) || defined(HAVE_CLOCK_GETTIME_RUNTIME)

/* test gettimeofday() */

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

if (err) {

if (raise_exc) {

PyErr_SetFromErrno(PyExc_OSError);

}

return -1;

}

if (pytime_fromtimeval(tp, &tv, raise_exc) < 0) {

return -1;

}

if (info) {

info->implementation = "gettimeofday()";

info->resolution = 1e-6;

info->monotonic = 0;

info->adjustable = 1;

}

#if defined(HAVE_CLOCK_GETTIME_RUNTIME) && defined(HAVE_CLOCK_GETTIME)

} /* end of availibity block */

#endif

#endif /* !HAVE_CLOCK_GETTIME */

#endif /* !MS_WINDOWS */

return 0;

}

_PyTime_t

_PyTime_GetSystemClock(void)

{

_PyTime_t t;

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

// If clock_gettime(CLOCK_REALTIME) or gettimeofday() fails:

// silently ignore the failure and return 0.

t = 0;

}

return t;

}

int

_PyTime_GetSystemClockWithInfo(_PyTime_t *t, _Py_clock_info_t *info)

{

return py_get_system_clock(t, info, 1);

}

#ifdef __APPLE__

static int

py_mach_timebase_info(_PyTime_t *pnumer, _PyTime_t *pdenom, int raise)

{

static mach_timebase_info_data_t timebase;

/* 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);

/* Sanity check: should never occur in practice */

if (timebase.numer < 1 || timebase.denom < 1) {

if (raise) {

PyErr_SetString(PyExc_RuntimeError,

"invalid mach_timebase_info");

}

return -1;

}

/* Check that timebase.numer and timebase.denom can be casted to

_PyTime_t. In practice, timebase uses uint32_t, so casting cannot

overflow. At the end, only make sure that the type is uint32_t

(_PyTime_t is 64-bit long). */

static_assert(sizeof(timebase.numer) <= sizeof(_PyTime_t),

View remainder of file in raw view

cpython/Python/pytime.c at 1d1bb95abdcafe92c771fb3dc4722351b032cc24 · python/cpython · GitHub

Repository navigation

Expand file tree

Breadcrumbs

pytime.c

Latest commit

History

Breadcrumbs

pytime.c

File metadata and controls