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pthread_exit(3)

PTHREAD_EXIT(3)            Linux Programmer's Manual           PTHREAD_EXIT(3)

NAME
       pthread_exit - terminate calling thread

SYNOPSIS
       #include <pthread.h>

       void pthread_exit(void *retval);

       Compile and link with -pthread.

DESCRIPTION
       The pthread_exit() function terminates the calling thread and returns a
       value  via  retval that (if the thread is joinable) is available to an‐
       other thread in the same process that calls pthread_join(3).

       Any clean-up handlers established by pthread_cleanup_push(3) 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 corre‐
       sponding destructor functions are called, in an unspecified order.

       When a thread terminates, process-shared resources (e.g., mutexes, con‐
       dition variables, semaphores, and file descriptors) are  not  released,
       and functions registered using atexit(3) are not called.

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

RETURN VALUE
       This function does not return to the caller.

ERRORS
       This function always succeeds.

ATTRIBUTES
       For  an  explanation  of  the  terms  used in this section, see attrib‐
       utes(7).  allbox;  lb  lb  lb  l  l  l.   Interface Attribute Value  T{
       pthread_exit() T}   Thread safety  MT-Safe

CONFORMING TO
       POSIX.1-2001, POSIX.1-2008.

NOTES
       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).

       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
       Currently, there are limitations in the kernel implementation logic for
       wait(2)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 sig‐
       nal is sent to a foreground process whose thread group leader  has  al‐
       ready called pthread_exit().

SEE ALSO
       pthread_create(3), pthread_join(3), pthreads(7)

COLOPHON
       This  page  is  part of release 5.02 of the Linux man-pages project.  A
       description of the project, information about reporting bugs,  and  the
       latest     version     of     this    page,    can    be    found    at
       https://www.kernel.org/doc/man-pages/.

Linux                             2017-09-15                   PTHREAD_EXIT(3)
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