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April, 26th. 2006:
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proc_pid_task
Section: File Formats (5) Updated: 202-0-08 Index
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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)).
-
See also:
-
- proc_tid_children(5).
-
- /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.
SEE ALSO
proc(5)
Index
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-
- DESCRIPTION
-
- SEE ALSO
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