개요

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pthread_join(3)

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



NAME
       pthread_join - join with a terminated thread

SYNOPSIS
       #include <pthread.h>

       int pthread_join(pthread_t thread, void **retval);

       Compile and link with -pthread.

DESCRIPTION
       The pthread_join() function waits for the thread specified by thread to
       terminate.  If that thread has already terminated, then  pthread_join()
       returns immediately.  The thread specified by thread must be joinable.

       If  retval  is  not NULL, then pthread_join() copies the exit status of
       the target thread (i.e., the value that the target thread  supplied  to
       pthread_exit(3)) into the location pointed to by retval.  If the target
       thread was canceled, then PTHREAD_CANCELED is placed  in  the  location
       pointed to by retval.

       If  multiple  threads  simultaneously try to join with the same thread,
       the results are undefined.  If the  thread  calling  pthread_join()  is
       canceled,  then  the  target thread will remain joinable (i.e., it will
       not be detached).

RETURN VALUE
       On success, pthread_join() returns 0; on error,  it  returns  an  error
       number.

ERRORS
       EDEADLK
              A  deadlock  was  detected (e.g., two threads tried to join with
              each other); or thread specifies the calling thread.

       EINVAL thread is not a joinable thread.

       EINVAL Another thread is already waiting to join with this thread.

       ESRCH  No thread with the ID thread could be found.

ATTRIBUTES
       For  an  explanation  of  the  terms  used   in   this   section,   see
       attributes(7).

       allbox;  lb  lb  lb l l l.  Interface Attribute Value T{ pthread_join()
       T}   Thread safety     MT-Safe


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

NOTES
       After a successful call to pthread_join(),  the  caller  is  guaranteed
       that  the  target thread has terminated.  The caller may then choose to
       do any clean-up that is required after termination of the thread (e.g.,
       freeing  memory  or  other  resources that were allocated to the target
       thread).

       Joining with a thread that has previously been joined results in  unde‐
       fined behavior.

       Failure  to  join with a thread that is joinable (i.e., one that is not
       detached), produces a "zombie thread".  Avoid doing  this,  since  each
       zombie  thread  consumes  some system resources, and when enough zombie
       threads have accumulated, it will no longer be possible to  create  new
       threads (or processes).

       There  is no pthreads analog of waitpid(-1, &status, 0), that is, "join
       with any terminated thread".  If you believe you need this  functional‐
       ity, you probably need to rethink your application design.

       All of the threads in a process are peers: any thread can join with any
       other thread in the process.

EXAMPLE
       See pthread_create(3).

SEE ALSO
       pthread_cancel(3),        pthread_create(3),         pthread_detach(3),
       pthread_exit(3), pthread_tryjoin_np(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_JOIN(3)