Linux get thread id

Linux get thread id

Get process ID or thread ID under windows
Get the process or thread ID of the current program code runtime by calling GetCurProcessId or GetNowThreadID provided by the system.
sample code:

Get process or thread ID under linux
Get process or thread ID via getpid and gettid
sample code:

Cross-platform design

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как получить идентификатор потока pthread в программе linux c?

в программе linux c, Как распечатать идентификатор потока потока, созданного библиотекой pthread?
например: мы можем получить pid процесса по getpid()

9 ответов

pthread_self() функция даст идентификатор потока текущего потока.

на pthread_self() функция возвращает дескриптор pthread вызывающего потока. Функция pthread_self () не возвращает интегральный поток вызывающего потока. Вы должны использовать pthread_getthreadid_np() для возврата интегрального идентификатора потока.

значительно быстрее, чем эти звонки, но обеспечивает такое же поведение.

что? Человек попросил конкретный Linux и эквивалент getpid (). Не BSD или Apple. Ответ-gettid () и возвращает интегральный тип. Вам нужно будет вызвать его с помощью syscall (), например:

хотя это не может быть переносимо для систем, отличных от linux, threadid напрямую сопоставим и очень быстро приобретается. Он может быть напечатан (например, для журналов) как обычное целое число.

можно использовать pthread_self()

родитель узнает идентификатор потока после pthread_create() выполняется успешно, но при выполнении потока, если мы хотим получить доступ к идентификатору потока, мы должны использовать функцию pthread_self() .

Как отмечено в других ответах, pthreads не определяет независимый от платформы способ получения идентификатора интегрального потока.

в системах Linux вы можете получить идентификатор потока таким образом:

на многих платформах на основе BSD этот ответ https://stackoverflow.com/a/21206357/316487 дает не-портативный путь.

однако, если причина, по которой вы думаете, что вам нужен идентификатор потока, — это знать, работаете ли вы в одном или другом потоке с другим потоком вы контролируете, вы можете найти некоторую полезность в этом подходе

Если вам просто нужно знать, находитесь ли вы в основном потоке, есть дополнительные способы, задокументированные в ответах на этот вопрос как я могу сказать, является ли pthread_self основным (первым) потоком в процессе?.

Linux предоставляет такой системный вызов, чтобы вы могли получить идентификатор потока.

эта единственная строка дает вам pid, каждый threadid и spid.

pthread_getthreadid_np не было на моем Mac os x. pthread_t является непрозрачным типом. Не ломай над этим голову. Просто назначьте его void* и называйте это хорошо. Если вам нужно printf использовать %p .

существует также другой способ получения идентификатора потока. При создании потоков с помощью

int pthread_create(pthread_t * thread, const pthread_attr_t * attr, void * (*start_routine)(void *), void *arg);

вызов функции; первый параметр pthread_t * thread фактически является идентификатором потока (это беззнаковый длинный int, определенный в bits/pthreadtypes.ч.) Кроме того, последний аргумент void *arg является аргументом, который передается void * (*start_routine) функция, котор нужно продеть нитку.

вы можете создать структуру для передачи нескольких аргументов и отправки указателя на структуру.

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Linux get thread id

[Article Title]: Scribble C# Multithread 02 [Article Author]: Drunk 【Author’s Email】: [email protected] [Download address]: Search and download by yourself [Author’s Statement]: Just interested, no othe.

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The thread ID-LWP identified by the kernel is valid at the system level In Linux, threads are called light weighted processes. Each user-mode thread has a scheduling entity in the kernel, also known a.

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Get Thread ID in C

This article will demonstrate multiple methods about how to get thread ID in C.

Use the pthread_self Function to Get Thread ID in C

Threads are the cornerstone of performance on contemporary CPUs as the latter tend to add more virtual or physical cores nowadays to support better multi-threaded workflows. Generally, a thread is denoted as a single flow of control in a process (i.e., running program). Thus, threads are used to implement multiple logic flows that would execute concurrently and form a program that utilizes multiple CPU cores. Note that POSIX threads have been the oldest standard interface for accessing threading facilities in C programs. pthread_self is one of the functions provided by the pthreads API that can retrieve the ID of the calling thread. It takes zero arguments and returns the integer denoting the thread ID as the pthread_t type variable.

In the following example code, we implemented the basic multi-threaded scenario, where the main program(thread) creates additional four threads that execute the printHello function and terminate using the pthread_exit function call. Notice that five threads are running during this program, and all exit after the given code path is executed. In the printHello function, all of them print their thread ID using the pthread_self function.

Use the gettid Function to Get Thread ID in C

gettid is a Linux-specific system call that is provided using the function wrapper in the C program, and it returns the caller’s thread ID. The function takes no arguments similar to the pthread_self and returns the pid_t type integer value. Note that the value returned by the gettid call is not the same as the ID retrieved from the pthread_self function, which is called POSIX thread ID. If the program is single-threaded, gettid returns the same value as the getpid — equal to the process ID.

Use the thrd_current Function to Get Thread ID in C

thrd_current is part of ISO C threads API added to the standard language specification in 2011. Note that this API provides a standard interface for POSIX compatible operating systems and any platform that provides a standard-compliant C compiler. Thus, this method is recommended way of interacting with threads in the C language. We use the pthread functions for creating and exiting the threads in the following example, though, one should choose a single interface (Pthreads or ISO C) when working on a project.

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The thread ID-LWP identified by the kernel is valid at the system level In Linux, threads are called light weighted processes. Each user-mode thread has a scheduling entity in the kernel, also known a.

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