pthread_kill(3) — Linux manual page

pthread_kill(3)         Library Functions Manual         pthread_kill(3)

NAME

       pthread_kill - send a signal to a thread

LIBRARY

       POSIX threads library (libpthread, -lpthread)

SYNOPSIS

       #include <signal.h>

       int pthread_kill(pthread_t thread, int sig);

   Feature Test Macro Requirements for glibc (see
   feature_test_macros(7)):

       pthread_kill():
           _POSIX_C_SOURCE >= 199506L || _XOPEN_SOURCE >= 500

DESCRIPTION

       The pthread_kill() function sends the signal sig to thread, a
       thread in the same process as the caller.  The signal is
       asynchronously directed to thread.

       If sig is 0, then no signal is sent, but error checking is still
       performed.

RETURN VALUE

       On success, pthread_kill() returns 0; on error, it returns an
       error number, and no signal is sent.

ERRORS

       EINVAL An invalid signal was specified.

ATTRIBUTES

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

VERSIONS

       The glibc implementation of pthread_kill() gives an error
       (EINVAL) on attempts to send either of the real-time signals used
       internally by the NPTL threading implementation.  See nptl(7) for
       details.

       POSIX.1-2008 recommends that if an implementation detects the use
       of a thread ID after the end of its lifetime, pthread_kill()
       should return the error ESRCH.  The glibc implementation returns
       this error in the cases where an invalid thread ID can be
       detected.  But note also that POSIX says that an attempt to use a
       thread ID whose lifetime has ended produces undefined behavior,
       and an attempt to use an invalid thread ID in a call to
       pthread_kill() can, for example, cause a segmentation fault.

STANDARDS

       POSIX.1-2008.

HISTORY

       POSIX.1-2001.

NOTES

       Signal dispositions are process-wide: if a signal handler is
       installed, the handler will be invoked in the thread thread, but
       if the disposition of the signal is "stop", "continue", or
       "terminate", this action will affect the whole process.

SEE ALSO

       kill(2), sigaction(2), sigpending(2), pthread_self(3),
       pthread_sigmask(3), raise(3), pthreads(7), signal(7)

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Linux man-pages 6.9.1          2024-05-02                pthread_kill(3)

Pages that refer to this page: pthread_sigmask(3), raise(3), nptl(7), pthreads(7), signal(7), signal-safety(7)

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