vn-verdnaturachat/ios/Pods/Flipper-Folly/folly/system/ThreadId.h

96 lines
3.1 KiB
C
Raw Normal View History

/*
* Copyright (c) Facebook, Inc. and its affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <cstdint>
#include <folly/portability/PThread.h>
#include <folly/portability/SysSyscall.h>
#include <folly/portability/Unistd.h>
#include <folly/portability/Windows.h>
namespace folly {
/**
* Get a process-specific identifier for the current thread.
*
* The return value will uniquely identify the thread within the current
* process.
*
* Note that the return value does not necessarily correspond to an operating
* system thread ID. The return value is also only unique within the current
* process: getCurrentThreadID() may return the same value for two concurrently
* running threads in separate processes.
*
* The thread ID may be reused once the thread it corresponds to has been
* joined.
*/
inline uint64_t getCurrentThreadID() {
#if __APPLE__
return uint64_t(pthread_mach_thread_np(pthread_self()));
#elif defined(_WIN32)
return uint64_t(GetCurrentThreadId());
#else
return uint64_t(pthread_self());
#endif
}
/**
* Get the operating-system level thread ID for the current thread.
*
* The returned value will uniquely identify this thread on the system.
*
* This makes it more suitable for logging or displaying in user interfaces
* than the result of getCurrentThreadID().
*
* There are some potential caveats about this API, however:
*
* - In theory there is no guarantee that application threads map one-to-one to
* kernel threads. An application threading implementation could potentially
* share one OS thread across multiple application threads, and/or it could
* potentially move application threads between different OS threads over
* time. However, in practice all of the platforms we currently support have
* a one-to-one mapping between userspace threads and operating system
* threads.
*
* - This API may also be slightly slower than getCurrentThreadID() on some
* platforms. This API may require a system call, where getCurrentThreadID()
* may only need to read thread-local memory.
*
* On Linux the returned value is a pid_t, and can be used in contexts
* requiring a thread pid_t.
*
* The thread ID may be reused once the thread it corresponds to has been
* joined.
*/
inline uint64_t getOSThreadID() {
#if __APPLE__
uint64_t tid;
pthread_threadid_np(nullptr, &tid);
return tid;
#elif defined(_WIN32)
return uint64_t(GetCurrentThreadId());
#elif defined(__FreeBSD__)
long tid;
thr_self(&tid);
return uint64_t(tid);
#else
return uint64_t(syscall(FOLLY_SYS_gettid));
#endif
}
} // namespace folly