PTHREAD_KILL(3) Linux Programmer's Manual PTHREAD_KILL(3)NAMEpthread_kill - send a signal to a thread
int pthread_kill(pthread_t thread, int sig);
Compile and link with -pthread.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
_POSIX_C_SOURCE >= 199506L || _XOPEN_SOURCE >= 500
The pthread_kill() function sends the signal sig to thread, a thread in
the same process as the caller. The signal is asynchronously directed
If sig is 0, then no signal is sent, but error checking is still per‐
On success, pthread_kill() returns 0; on error, it returns an error
number, and no signal is sent.
EINVAL An invalid signal was specified.
Signal dispositions are process-wide: if a signal handler is installed,
the handler will be invoked in the thread thread, but if the disposi‐
tion of the signal is "stop", "continue", or "terminate", this action
will affect the whole process.
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
SEE ALSOkill(2), sigaction(2), sigpending(2), pthread_self(3), pthread_sig‐
mask(3), raise(3), pthreads(7), signal(7)COLOPHON
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Linux 2014-02-04 PTHREAD_KILL(3)