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       noreturn 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  an‐
18       other 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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ATTRIBUTES

42       For an  explanation  of  the  terms  used  in  this  section,  see  at‐
43       tributes(7).
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45       ┌────────────────────────────────────────────┬───────────────┬─────────┐
46       │Interface                                   │ Attribute     │ Value   │
47       ├────────────────────────────────────────────┼───────────────┼─────────┤
48       │pthread_exit()                              │ Thread safety │ MT-Safe │
49       └────────────────────────────────────────────┴───────────────┴─────────┘
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CONFORMING TO

52       POSIX.1-2001, POSIX.1-2008.
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NOTES

55       Performing  a  return  from the start function of any thread other than
56       the main thread results in an implicit call  to  pthread_exit(),  using
57       the function's return value as the thread's exit status.
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59       To  allow  other  threads to continue execution, the main thread should
60       terminate by calling pthread_exit() rather than exit(3).
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62       The value pointed to by retval should not be  located  on  the  calling
63       thread's  stack,  since  the contents of that stack are undefined after
64       the thread terminates.
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BUGS

67       Currently, there are limitations in the kernel implementation logic for
68       wait(2)ing  on  a stopped thread group with a dead thread group leader.
69       This can manifest in problems such as a locked terminal if a stop  sig‐
70       nal  is  sent to a foreground process whose thread group leader has al‐
71       ready called pthread_exit().
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COLOPHON

77       This page is part of release 5.12 of the Linux  man-pages  project.   A
78       description  of  the project, information about reporting bugs, and the
79       latest    version    of    this    page,    can     be     found     at
80       https://www.kernel.org/doc/man-pages/.
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84Linux                             2021-03-22                   PTHREAD_EXIT(3)