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1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include <__thread/support/windows.h>10#include <chrono>11 12#define NOMINMAX13#define WIN32_LEAN_AND_MEAN14#include <windows.h>15#include <process.h>16#include <fibersapi.h>17 18_LIBCPP_BEGIN_NAMESPACE_STD19 20static_assert(sizeof(__libcpp_mutex_t) == sizeof(SRWLOCK), "");21static_assert(alignof(__libcpp_mutex_t) == alignof(SRWLOCK), "");22 23static_assert(sizeof(__libcpp_recursive_mutex_t) == sizeof(CRITICAL_SECTION), "");24static_assert(alignof(__libcpp_recursive_mutex_t) == alignof(CRITICAL_SECTION), "");25 26static_assert(sizeof(__libcpp_condvar_t) == sizeof(CONDITION_VARIABLE), "");27static_assert(alignof(__libcpp_condvar_t) == alignof(CONDITION_VARIABLE), "");28 29static_assert(sizeof(__libcpp_exec_once_flag) == sizeof(INIT_ONCE), "");30static_assert(alignof(__libcpp_exec_once_flag) == alignof(INIT_ONCE), "");31 32static_assert(sizeof(__libcpp_thread_id) == sizeof(DWORD), "");33static_assert(alignof(__libcpp_thread_id) == alignof(DWORD), "");34 35static_assert(sizeof(__libcpp_thread_t) == sizeof(HANDLE), "");36static_assert(alignof(__libcpp_thread_t) == alignof(HANDLE), "");37 38static_assert(sizeof(__libcpp_tls_key) == sizeof(DWORD), "");39static_assert(alignof(__libcpp_tls_key) == alignof(DWORD), "");40 41// Mutex42int __libcpp_recursive_mutex_init(__libcpp_recursive_mutex_t* __m) {43  InitializeCriticalSection((LPCRITICAL_SECTION)__m);44  return 0;45}46 47int __libcpp_recursive_mutex_lock(__libcpp_recursive_mutex_t* __m) {48  EnterCriticalSection((LPCRITICAL_SECTION)__m);49  return 0;50}51 52bool __libcpp_recursive_mutex_trylock(__libcpp_recursive_mutex_t* __m) {53  return TryEnterCriticalSection((LPCRITICAL_SECTION)__m) != 0;54}55 56int __libcpp_recursive_mutex_unlock(__libcpp_recursive_mutex_t* __m) {57  LeaveCriticalSection((LPCRITICAL_SECTION)__m);58  return 0;59}60 61int __libcpp_recursive_mutex_destroy(__libcpp_recursive_mutex_t* __m) {62  DeleteCriticalSection((LPCRITICAL_SECTION)__m);63  return 0;64}65 66int __libcpp_mutex_lock(__libcpp_mutex_t* __m) {67  AcquireSRWLockExclusive((PSRWLOCK)__m);68  return 0;69}70 71bool __libcpp_mutex_trylock(__libcpp_mutex_t* __m) { return TryAcquireSRWLockExclusive((PSRWLOCK)__m) != 0; }72 73int __libcpp_mutex_unlock(__libcpp_mutex_t* __m) {74  ReleaseSRWLockExclusive((PSRWLOCK)__m);75  return 0;76}77 78int __libcpp_mutex_destroy(__libcpp_mutex_t* __m) {79  static_cast<void>(__m);80  return 0;81}82 83// Condition Variable84int __libcpp_condvar_signal(__libcpp_condvar_t* __cv) {85  WakeConditionVariable((PCONDITION_VARIABLE)__cv);86  return 0;87}88 89int __libcpp_condvar_broadcast(__libcpp_condvar_t* __cv) {90  WakeAllConditionVariable((PCONDITION_VARIABLE)__cv);91  return 0;92}93 94int __libcpp_condvar_wait(__libcpp_condvar_t* __cv, __libcpp_mutex_t* __m) {95  SleepConditionVariableSRW((PCONDITION_VARIABLE)__cv, (PSRWLOCK)__m, INFINITE, 0);96  return 0;97}98 99int __libcpp_condvar_timedwait(__libcpp_condvar_t* __cv, __libcpp_mutex_t* __m, __libcpp_timespec_t* __ts) {100  using namespace std::chrono;101 102  auto duration   = seconds(__ts->tv_sec) + nanoseconds(__ts->tv_nsec);103  auto abstime    = system_clock::time_point(duration_cast<system_clock::duration>(duration));104  auto timeout_ms = duration_cast<milliseconds>(abstime - system_clock::now());105 106  if (!SleepConditionVariableSRW(107          (PCONDITION_VARIABLE)__cv, (PSRWLOCK)__m, timeout_ms.count() > 0 ? timeout_ms.count() : 0, 0)) {108    auto __ec = GetLastError();109    return __ec == ERROR_TIMEOUT ? ETIMEDOUT : __ec;110  }111  return 0;112}113 114int __libcpp_condvar_destroy(__libcpp_condvar_t* __cv) {115  static_cast<void>(__cv);116  return 0;117}118 119// Execute Once120static inline _LIBCPP_HIDE_FROM_ABI BOOL CALLBACK121__libcpp_init_once_execute_once_thunk(PINIT_ONCE __init_once, PVOID __parameter, PVOID* __context) {122  static_cast<void>(__init_once);123  static_cast<void>(__context);124 125  void (*init_routine)(void) = reinterpret_cast<void (*)(void)>(__parameter);126  init_routine();127  return TRUE;128}129 130int __libcpp_execute_once(__libcpp_exec_once_flag* __flag, void (*__init_routine)(void)) {131  if (!InitOnceExecuteOnce(132          (PINIT_ONCE)__flag, __libcpp_init_once_execute_once_thunk, reinterpret_cast<void*>(__init_routine), nullptr))133    return GetLastError();134  return 0;135}136 137// Thread ID138bool __libcpp_thread_id_equal(__libcpp_thread_id __lhs, __libcpp_thread_id __rhs) { return __lhs == __rhs; }139 140bool __libcpp_thread_id_less(__libcpp_thread_id __lhs, __libcpp_thread_id __rhs) { return __lhs < __rhs; }141 142// Thread143struct __libcpp_beginthreadex_thunk_data {144  void* (*__func)(void*);145  void* __arg;146};147 148static inline _LIBCPP_HIDE_FROM_ABI unsigned WINAPI __libcpp_beginthreadex_thunk(void* __raw_data) {149  auto* __data = static_cast<__libcpp_beginthreadex_thunk_data*>(__raw_data);150  auto* __func = __data->__func;151  void* __arg  = __data->__arg;152  delete __data;153  return static_cast<unsigned>(reinterpret_cast<uintptr_t>(__func(__arg)));154}155 156bool __libcpp_thread_isnull(const __libcpp_thread_t* __t) { return *__t == 0; }157 158int __libcpp_thread_create(__libcpp_thread_t* __t, void* (*__func)(void*), void* __arg) {159  auto* __data   = new __libcpp_beginthreadex_thunk_data;160  __data->__func = __func;161  __data->__arg  = __arg;162 163  *__t = reinterpret_cast<HANDLE>(_beginthreadex(nullptr, 0, __libcpp_beginthreadex_thunk, __data, 0, nullptr));164 165  if (*__t)166    return 0;167  return GetLastError();168}169 170__libcpp_thread_id __libcpp_thread_get_current_id() { return GetCurrentThreadId(); }171 172__libcpp_thread_id __libcpp_thread_get_id(const __libcpp_thread_t* __t) { return GetThreadId(*__t); }173 174int __libcpp_thread_join(__libcpp_thread_t* __t) {175  if (WaitForSingleObjectEx(*__t, INFINITE, FALSE) == WAIT_FAILED)176    return GetLastError();177  if (!CloseHandle(*__t))178    return GetLastError();179  return 0;180}181 182int __libcpp_thread_detach(__libcpp_thread_t* __t) {183  if (!CloseHandle(*__t))184    return GetLastError();185  return 0;186}187 188void __libcpp_thread_yield() { SwitchToThread(); }189 190void __libcpp_thread_sleep_for(const chrono::nanoseconds& __ns) {191  // round-up to the nearest millisecond192  chrono::milliseconds __ms = chrono::ceil<chrono::milliseconds>(__ns);193  // FIXME(compnerd) this should be an alertable sleep (WFSO or SleepEx)194  Sleep(__ms.count());195}196 197// Thread Local Storage198int __libcpp_tls_create(__libcpp_tls_key* __key, void(_LIBCPP_TLS_DESTRUCTOR_CC* __at_exit)(void*)) {199  DWORD index = FlsAlloc(__at_exit);200  if (index == FLS_OUT_OF_INDEXES)201    return GetLastError();202  *__key = index;203  return 0;204}205 206void* __libcpp_tls_get(__libcpp_tls_key __key) { return FlsGetValue(__key); }207 208int __libcpp_tls_set(__libcpp_tls_key __key, void* __p) {209  if (!FlsSetValue(__key, __p))210    return GetLastError();211  return 0;212}213 214_LIBCPP_END_NAMESPACE_STD215