pthread_kill — send a signal to a thread
Compile and link with
sends the signal
thread, a thread
in the same process as the caller. The signal is
asynchronously directed to
sig is 0, then
no signal is sent, but error checking is still performed.
returns 0; on error, it returns an error number, and no
signal is sent.
For an explanation of the terms used in this section, see attributes(7).
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
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