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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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PTHREAD_EXIT(3P) POSIX Programmer's Manual PTHREAD_EXIT(3P)
This manual page is part of the POSIX Programmer's Manual. The
Linux implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior), or
the interface may not be implemented on Linux.
pthread_exit — thread termination
#include <pthread.h>
void pthread_exit(void *value_ptr);
The pthread_exit() function shall terminate the calling thread and
make the value value_ptr available to any successful join with the
terminating thread. Any cancellation cleanup handlers that have
been pushed and not yet popped shall be popped in the reverse
order that they were pushed and then executed. After all
cancellation cleanup handlers have been executed, if the thread
has any thread-specific data, appropriate destructor functions
shall be called in an unspecified order. Thread termination does
not release any application visible process resources, including,
but not limited to, mutexes and file descriptors, nor does it
perform any process-level cleanup actions, including, but not
limited to, calling any atexit() routines that may exist.
An implicit call to pthread_exit() is made when a thread other
than the thread in which main() was first invoked returns from the
start routine that was used to create it. The function's return
value shall serve as the thread's exit status.
The behavior of pthread_exit() is undefined if called from a
cancellation cleanup handler or destructor function that was
invoked as a result of either an implicit or explicit call to
pthread_exit().
After a thread has terminated, the result of access to local
(auto) variables of the thread is undefined. Thus, references to
local variables of the exiting thread should not be used for the
pthread_exit() value_ptr parameter value.
The process shall exit with an exit status of 0 after the last
thread has been terminated. The behavior shall be as if the
implementation called exit() with a zero argument at thread
termination time.
The pthread_exit() function cannot return to its caller.
No errors are defined.
The following sections are informative.
None.
None.
The normal mechanism by which a thread terminates is to return
from the routine that was specified in the pthread_create() call
that started it. The pthread_exit() function provides the
capability for a thread to terminate without requiring a return
from the start routine of that thread, thereby providing a
function analogous to exit().
Regardless of the method of thread termination, any cancellation
cleanup handlers that have been pushed and not yet popped are
executed, and the destructors for any existing thread-specific
data are executed. This volume of POSIX.1‐2017 requires that
cancellation cleanup handlers be popped and called in order. After
all cancellation cleanup handlers have been executed, thread-
specific data destructors are called, in an unspecified order, for
each item of thread-specific data that exists in the thread. This
ordering is necessary because cancellation cleanup handlers may
rely on thread-specific data.
As the meaning of the status is determined by the application
(except when the thread has been canceled, in which case it is
PTHREAD_CANCELED), the implementation has no idea what an illegal
status value is, which is why no address error checking is done.
None.
exit(3p), pthread_create(3p), pthread_join(3p)
The Base Definitions volume of POSIX.1‐2017, pthread.h(0p)
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 by the Institute of Electrical and Electronics Engineers,
Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard,
the original IEEE and The Open Group Standard is the referee
document. The original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
Any typographical or formatting errors that appear in this page
are most likely to have been introduced during the conversion of
the source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2017 PTHREAD_EXIT(3P)
Pages that refer to this page: pthread.h(0p), pthread_cancel(3p), pthread_create(3p)
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HTML rendering created 2025-02-02 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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