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pthread_kill(3) — Linux manual page

pthread_kill(3)          Library Functions Manualpthread_kill(3)

NAME        top

       pthread_kill - send a signal to a thread

LIBRARY        top

       POSIX threads library (libpthread,-lpthread)

SYNOPSIS        top

#include <signal.h>int pthread_kill(pthread_tthread, intsig);   Feature Test Macro Requirements for glibc (seefeature_test_macros(7)):pthread_kill():           _POSIX_C_SOURCE >= 199506L || _XOPEN_SOURCE >= 500

DESCRIPTION        top

       Thepthread_kill() function sends the signalsig tothread, a       thread in the same process as the caller.  The signal is       asynchronously directed tothread.       Ifsig is 0, then no signal is sent, but error checking is still       performed.

RETURN VALUE        top

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

ERRORS        top

EINVALAn invalid signal was specified.

ATTRIBUTES        top

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

VERSIONS        top

       The glibc implementation ofpthread_kill() gives an error (EINVAL)       on attempts to send either of the real-time signals used       internally by the NPTL threading implementation.  Seenptl(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 errorESRCH.  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 topthread_kill() can, for example, cause a segmentation fault.

STANDARDS        top

       POSIX.1-2008.

HISTORY        top

       POSIX.1-2001.

NOTES        top

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

SEE ALSO        top

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

COLOPHON        top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17pthread_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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