pthread_exit(3) - Linux manual page (original) (raw)

pthreadexit(3) Library Functions Manual pthreadexit(3)

NAME top

   pthread_exit - terminate calling thread

LIBRARY top

   POSIX threads library (_libpthread_, _-lpthread_)

SYNOPSIS top

   **#include <pthread.h>**

   **[[noreturn]] void pthread_exit(void ***_retval_**);**

DESCRIPTION top

   The **pthread_exit**() function terminates the calling thread and
   returns a value via _retval_ that (if the thread is joinable) is
   available to another thread in the same process that calls
   [pthread_join(3)](../man3/pthread%5Fjoin.3.html).

   Any clean-up handlers established by [pthread_cleanup_push(3)](../man3/pthread%5Fcleanup%5Fpush.3.html) that
   have not yet been popped, are popped (in the reverse of the order
   in which they were pushed) and executed.  If the thread has any
   thread-specific data, then, after the clean-up handlers have been
   executed, the corresponding destructor functions are called, in an
   unspecified order.

   When a thread terminates, process-shared resources (e.g., mutexes,
   condition variables, semaphores, and file descriptors) are not
   released, and functions registered using [atexit(3)](../man3/atexit.3.html) are not called.

   After the last thread in a process terminates, the process
   terminates as by calling [exit(3)](../man3/exit.3.html) with an exit status of zero;
   thus, process-shared resources are released and functions
   registered using [atexit(3)](../man3/atexit.3.html) are called.

RETURN VALUE top

   This function does not return to the caller.

ERRORS top

   This function always succeeds.

ATTRIBUTES top

   For an explanation of the terms used in this section, see
   [attributes(7)](../man7/attributes.7.html).
   ┌──────────────────────────────────────┬───────────────┬─────────┐
   │ **Interface** │ **Attribute** │ **Value** │
   ├──────────────────────────────────────┼───────────────┼─────────┤
   │ **pthread_exit**()                       │ Thread safety │ MT-Safe │
   └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS top

   POSIX.1-2008.

HISTORY top

   POSIX.1-2001.

NOTES top

   Performing a return from the start function of any thread other
   than the main thread results in an implicit call to
   **pthread_exit**(), using the function's return value as the thread's
   exit status.

   To allow other threads to continue execution, the main thread
   should terminate by calling **pthread_exit**() rather than [exit(3)](../man3/exit.3.html).

   The value pointed to by _retval_ should not be located on the
   calling thread's stack, since the contents of that stack are
   undefined after the thread terminates.

BUGS top

   Currently, there are limitations in the kernel implementation
   logic for [wait(2)](../man2/wait.2.html)ing on a stopped thread group with a dead thread
   group leader.  This can manifest in problems such as a locked
   terminal if a stop signal is sent to a foreground process whose
   thread group leader has already called **pthread_exit**().

SEE ALSO top

   [pthread_create(3)](../man3/pthread%5Fcreate.3.html), [pthread_join(3)](../man3/pthread%5Fjoin.3.html), [pthreads(7)](../man7/pthreads.7.html)

COLOPHON top

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   man-pages@man7.org

Linux man-pages 6.10 2024-07-23 pthreadexit(3)

Pages that refer to this page:PR_SET_PDEATHSIG(2const), pthread_cancel(3), pthread_cleanup_push(3), pthread_create(3), pthread_detach(3), pthread_join(3), pthread_key_create(3), pthread_tryjoin_np(3), proc_pid_cwd(5), proc_pid_exe(5), proc_pid_fd(5), proc_pid_root(5), proc_pid_task(5), pthreads(7)