Man page - proc_tid(5)

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Manual

proc_pid_task

NAME
DESCRIPTION
SEE ALSO

NAME

/proc/pid/task/, /proc/tid/, /proc/thread-self/ - thread information

DESCRIPTION

/proc/ pid /task/ (since Linux 2.6.0)

This is a directory that contains one subdirectory for each thread in the process. The name of each subdirectory is the numerical thread ID ( tid ) of the thread (see gettid (2)).

Within each of these subdirectories, there is a set of files with the same names and contents as under the /proc/ pid directories. For attributes that are shared by all threads, the contents for each of the files under the task/ tid subdirectories will be the same as in the corresponding file in the parent /proc/ pid directory (e.g., in a multithreaded process, all of the task/ tid /cwd files will have the same value as the /proc/ pid /cwd file in the parent directory, since all of the threads in a process share a working directory). For attributes that are distinct for each thread, the corresponding files under task/ tid may have different values (e.g., various fields in each of the task/ tid /status files may be different for each thread), or they might not exist in /proc/ pid at all.

In a multithreaded process, the contents of the /proc/ pid /task directory are not available if the main thread has already terminated (typically by calling pthread_exit (3)).

/proc/ tid /

There is a numerical subdirectory for each running thread that is not a thread group leader (i.e., a thread whose thread ID is not the same as its process ID); the subdirectory is named by the thread ID. Each one of these subdirectories contains files and subdirectories exposing information about the thread with the thread ID tid . The contents of these directories are the same as the corresponding /proc/ pid /task/ tid directories.

The /proc/ tid subdirectories are not visible when iterating through /proc with getdents (2) (and thus are not visible when one uses ls (1) to view the contents of /proc ). However, the pathnames of these directories are visible to (i.e., usable as arguments in) system calls that operate on pathnames.

/proc/thread-self/ (since Linux 3.17)

This directory refers to the thread accessing the /proc filesystem, and is identical to the /proc/self/task/ tid directory named by the process thread ID ( tid ) of the same thread.