pthread_exit(3)

1PTHREAD_EXIT(3)            Linux Programmer's Manual           PTHREAD_EXIT(3)
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NAME

6       pthread_exit - terminate calling thread
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SYNOPSIS

9       #include <pthread.h>
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11       void pthread_exit(void *retval);
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13       Compile and link with -pthread.
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DESCRIPTION

16       The pthread_exit() function terminates the calling thread and returns a
17       value via retval that (if the  thread  is  joinable)  is  available  to
18       another thread in the same process that calls pthread_join(3).
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20       Any  clean-up handlers established by pthread_cleanup_push(3) that have
21       not yet been popped, are popped (in the reverse of the order  in  which
22       they  were pushed) and executed.  If the thread has any thread-specific
23       data, then, after the clean-up handlers have been executed, the  corre‐
24       sponding destructor functions are called, in an unspecified order.
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26       When a thread terminates, process-shared resources (e.g., mutexes, con‐
27       dition variables, semaphores, and file descriptors) are  not  released,
28       and functions registered using atexit(3) are not called.
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30       After  the  last thread in a process terminates, the process terminates
31       as by calling exit(3) with an exit status of zero; thus, process-shared
32       resources  are  released  and  functions registered using atexit(3) are
33       called.
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RETURN VALUE

36       This function does not return to the caller.
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ERRORS

39       This function always succeeds.
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CONFORMING TO

42       POSIX.1-2001.
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NOTES

45       Performing a return from the start function of any  thread  other  than
46       the  main  thread  results in an implicit call to pthread_exit(), using
47       the function's return value as the thread's exit status.
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49       To allow other threads to continue execution, the  main  thread  should
50       terminate by calling pthread_exit() rather than exit(3).
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52       The  value  pointed  to  by retval should not be located on the calling
53       thread's stack, since the contents of that stack  are  undefined  after
54       the thread terminates.
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BUGS

57       Currently, there are limitations in the kernel implementation logic for
58       wait(2)ing on a stopped thread group with a dead thread  group  leader.
59       This  can manifest in problems such as a locked terminal if a stop sig‐
60       nal is sent to a foreground  process  whose  thread  group  leader  has
61       already called pthread_exit().
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COLOPHON

67       This  page  is  part of release 3.53 of the Linux man-pages project.  A
68       description of the project, and information about reporting  bugs,  can
69       be found at http://www.kernel.org/doc/man-pages/.
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73Linux                             2009-03-30                   PTHREAD_EXIT(3)