отправить сигнал в поток (send a signal to a thread)
Пролог (Prolog)
This manual page is part of the POSIX Programmer's Manual. The
Linux implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
Имя (Name)
pthread_kill — send a signal to a thread
Синопсис (Synopsis)
#include <signal.h>
int pthread_kill(pthread_t thread, int sig);
Описание (Description)
The pthread_kill() function shall request that a signal be
delivered to the specified thread.
As in kill(), if sig is zero, error checking shall be performed
but no signal shall actually be sent.
Возвращаемое значение (Return value)
Upon successful completion, the function shall return a value of
zero. Otherwise, the function shall return an error number. If
the pthread_kill() function fails, no signal shall be sent.
Ошибки (Error)
The pthread_kill() function shall fail if:
EINVAL The value of the sig argument is an invalid or unsupported
signal number.
The pthread_kill() function shall not return an error code of
[EINTR].
The following sections are informative.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
The pthread_kill() function provides a mechanism for
asynchronously directing a signal at a thread in the calling
process. This could be used, for example, by one thread to affect
broadcast delivery of a signal to a set of threads.
Note that pthread_kill() only causes the signal to be handled in
the context of the given thread; the signal action (termination
or stopping) affects the process as a whole.
Обоснование (Rationale)
If an implementation detects use of a thread ID after the end of
its lifetime, it is recommended that the function should fail and
report an [ESRCH] error.
Existing implementations vary on the result of a pthread_kill()
with a thread ID indicating an inactive thread (a terminated
thread that has not been detached or joined). Some indicate
success on such a call, while others give an error of [ESRCH].
Since the definition of thread lifetime in this volume of
POSIX.1‐2017 covers inactive threads, the [ESRCH] error as
described is inappropriate in this case. In particular, this
means that an application cannot have one thread check for
termination of another with pthread_kill().
Будущие направления (Future directions)
A future version of this standard may require that pthread_kill()
not fail with [ESRCH] in the case of sending signals to an
inactive thread (a terminated thread not yet detached or joined),
even though no signal will be delivered because the thread is no
longer running.
Смотри также (See also)
kill(3p), pthread_self(3p), raise(3p)
The Base Definitions volume of POSIX.1‐2017, signal.h(0p)
