pthread_kill(3) - Linux manual page (original) (raw)
pthreadkill(3) Library Functions Manual pthreadkill(3)
NAME top
pthread_kill - send a signal to a threadLIBRARY top
POSIX threads library (_libpthread_, _-lpthread_)SYNOPSIS top
**#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 >= 500DESCRIPTION top
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 top
On success, **pthread_kill**() returns 0; on error, it returns an
error number, and no signal is sent.ERRORS top
**EINVAL** An invalid signal was specified.ATTRIBUTES top
For an explanation of the terms used in this section, see
[attributes(7)](../man7/attributes.7.html).
┌──────────────────────────────────────┬───────────────┬─────────┐
│ **Interface** │ **Attribute** │ **Value** │
├──────────────────────────────────────┼───────────────┼─────────┤
│ **pthread_kill**() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘VERSIONS top
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)](../man7/nptl.7.html) 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 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 thread _thread_, but
if the disposition of the signal is "stop", "continue", or
"terminate", this action will affect the whole process.SEE ALSO top
[kill(2)](../man2/kill.2.html), [sigaction(2)](../man2/sigaction.2.html), [sigpending(2)](../man2/sigpending.2.html), [pthread_self(3)](../man3/pthread%5Fself.3.html),
[pthread_sigmask(3)](../man3/pthread%5Fsigmask.3.html), [raise(3)](../man3/raise.3.html), [pthreads(7)](../man7/pthreads.7.html), [signal(7)](../man7/signal.7.html)COLOPHON top
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man-pages@man7.orgLinux man-pages 6.10 2024-07-23 pthreadkill(3)
Pages that refer to this page:pthread_sigmask(3), raise(3), nptl(7), pthreads(7), signal(7), signal-safety(7)