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-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include <__thread/support/windows.h>
10#include <chrono>
11
12#define NOMINMAX
13#define WIN32_LEAN_AND_MEAN
14#include <windows.h>
15#include <process.h>
16#include <fibersapi.h>
17
18_LIBCPP_BEGIN_NAMESPACE_STD
19
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// Mutex
42int __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 Variable
84int __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 Once
120static inline _LIBCPP_HIDE_FROM_ABI BOOL CALLBACK
121__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 ID
138bool __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// Thread
143struct __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 millisecond
192 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 Storage
198int __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_STD
215

source code of libcxx/src/support/win32/thread_win32.cpp