pthread_kill - send a signal to a thread
POSIX threads library (
libpthread,
-lpthread)
#include <signal.h>
int pthread_kill(pthread_t thread, int sig);
pthread_kill():
_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 to
thread.
If
sig is 0, then no signal is sent, but error checking is still
performed.
On success,
pthread_kill() returns 0; on error, it returns an error
number, and no signal is sent.
- EINVAL
- An invalid signal was specified.
For an explanation of the terms used in this section, see
attributes(7).
Interface |
Attribute |
Value |
pthread_kill () |
Thread safety |
MT-Safe |
POSIX.1-2001, POSIX.1-2008.
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.
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.
kill(2),
sigaction(2),
sigpending(2),
pthread_self(3),
pthread_sigmask(3),
raise(3),
pthreads(7),
signal(7)