[libcxx-commits] [libcxxabi] [libcxx] [libc++] Split the monolithic __threading_support header (PR #79654)

[Nikolas Klauser via libcxx-commits]

================
@@ -0,0 +1,119 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___THREAD_SUPPORT_H
+#define _LIBCPP___THREAD_SUPPORT_H
+
+#include <__config>
+
+#ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER
+#  pragma GCC system_header
+#endif
+
+/*
+
+//
+// The library supports multiple implementations of the basic threading functionality.
+// The following functionality must be provided by any implementation:
+//
+
+using __libcpp_timespec_t = ...;
+
+//
+// Mutex
+//
+using __libcpp_mutex_t = ...;
+#define _LIBCPP_MUTEX_INITIALIZER ...
+
+using __libcpp_recursive_mutex_t = ...;
+
+int __libcpp_recursive_mutex_init(__libcpp_recursive_mutex_t*);
+_LIBCPP_NO_THREAD_SAFETY_ANALYSIS int __libcpp_recursive_mutex_lock(__libcpp_recursive_mutex_t*);
+_LIBCPP_NO_THREAD_SAFETY_ANALYSIS bool __libcpp_recursive_mutex_trylock(__libcpp_recursive_mutex_t*);
+_LIBCPP_NO_THREAD_SAFETY_ANALYSIS int __libcpp_recursive_mutex_unlock(__libcpp_recursive_mutex_t*);
+int __libcpp_recursive_mutex_destroy(__libcpp_recursive_mutex_t*);
+
+_LIBCPP_NO_THREAD_SAFETY_ANALYSIS int __libcpp_mutex_lock(__libcpp_mutex_t*);
+_LIBCPP_NO_THREAD_SAFETY_ANALYSIS bool __libcpp_mutex_trylock(__libcpp_mutex_t*);
+_LIBCPP_NO_THREAD_SAFETY_ANALYSIS int __libcpp_mutex_unlock(__libcpp_mutex_t*);
+int __libcpp_mutex_destroy(__libcpp_mutex_t*);
+
+//
+// Condition Variable
+//
+using __libcpp_condvar_t = ...;
+#define _LIBCPP_CONDVAR_INITIALIZER ...
+
+int __libcpp_condvar_signal(__libcpp_condvar_t*);
+int __libcpp_condvar_broadcast(__libcpp_condvar_t*);
+_LIBCPP_NO_THREAD_SAFETY_ANALYSIS int __libcpp_condvar_wait(__libcpp_condvar_t*, __libcpp_mutex_t*);
+_LIBCPP_NO_THREAD_SAFETY_ANALYSIS
+int __libcpp_condvar_timedwait(__libcpp_condvar_t*, __libcpp_mutex_t*, __libcpp_timespec_t*);
+int __libcpp_condvar_destroy(__libcpp_condvar_t*);
+
+//
+// Execute once
+//
+using __libcpp_exec_once_flag = ...;
+#define _LIBCPP_EXEC_ONCE_INITIALIZER ...
+
+int __libcpp_execute_once(__libcpp_exec_once_flag*, void (*__init_routine)());
+
+//
+// Thread id
+//
+using __libcpp_thread_id = ...;
+
+bool __libcpp_thread_id_equal(__libcpp_thread_id, __libcpp_thread_id);
+bool __libcpp_thread_id_less(__libcpp_thread_id, __libcpp_thread_id);
+
+//
+// Thread
+//
+#define _LIBCPP_NULL_THREAD ...
+using __libcpp_thread_t = ...;
+
+bool __libcpp_thread_isnull(const __libcpp_thread_t*);
+int __libcpp_thread_create(__libcpp_thread_t*, void* (*__func)(void*), void* __arg);
+__libcpp_thread_id __libcpp_thread_get_current_id();
+__libcpp_thread_id __libcpp_thread_get_id(const __libcpp_thread_t*);
+int __libcpp_thread_join(__libcpp_thread_t*);
+int __libcpp_thread_detach(__libcpp_thread_t*);
+void __libcpp_thread_yield();
+void __libcpp_thread_sleep_for(const chrono::nanoseconds&);
+
+//
+// Thread local storage
+//
+#define _LIBCPP_TLS_DESTRUCTOR_CC ...
+using __libcpp_tls_key = ...;
+
+int __libcpp_tls_create(__libcpp_tls_key*, void (*__at_exit)(void*));
+void* __libcpp_tls_get(__libcpp_tls_key);
+int __libcpp_tls_set(__libcpp_tls_key, void*);
+
+*/
+
+#if !defined(_LIBCPP_HAS_NO_THREADS)
+
+#  if defined(_LIBCPP_HAS_THREAD_API_EXTERNAL)
+#    include <__thread/support/external.h>
----------------
philnik777 wrote:

Maybe just include the `<__external_threading>` header directly? There doesn't seem to be much reason not to.

https://github.com/llvm/llvm-project/pull/79654