pthread_sigqueue(3)

1PTHREAD_SIGQUEUE(3)        Linux Programmer's Manual       PTHREAD_SIGQUEUE(3)
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NAME

6       pthread_sigqueue - queue a signal and data to a thread
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SYNOPSIS

9       #include <signal.h>
10       #include <pthread.h>
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12       int pthread_sigqueue(pthread_t thread, int sig,
13                            const union sigval value);
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15       Compile and link with -pthread.
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17   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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19       pthread_sigqueue(): _GNU_SOURCE
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DESCRIPTION

22       The pthread_sigqueue() function performs a similar task to sigqueue(3),
23       but, rather than sending a signal to a process, it sends a signal to  a
24       thread in the same process as the calling thread.
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26       The  thread  argument  is the ID of a thread in the same process as the
27       caller.  The sig argument specifies the signal to be sent.   The  value
28       argument  specifies  data  to accompany the signal; see sigqueue(3) for
29       details.
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RETURN VALUE

32       On success, pthread_sigqueue() returns 0; on error, it returns an error
33       number.
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ERRORS

36       EAGAIN The limit of signals which may be queued has been reached.  (See
37              signal(7) for further information.)
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39       EINVAL sig was invalid.
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41       ENOSYS pthread_sigqueue() is not supported on this system.
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43       ESRCH  thread is not valid.
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VERSIONS

46       The pthread_sigqueue() function first appeared in glibc 2.11.
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ATTRIBUTES

49       For  an  explanation  of  the  terms  used   in   this   section,   see
50       attributes(7).
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52       ┌───────────────────┬───────────────┬─────────┐
53       │Interface          │ Attribute     │ Value   │
54       ├───────────────────┼───────────────┼─────────┤
55       │pthread_sigqueue() │ Thread safety │ MT-Safe │
56       └───────────────────┴───────────────┴─────────┘

CONFORMING TO

58       This function is a GNU extension.
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NOTES

61       The  glibc implementation of pthread_sigqueue() gives an error (EINVAL)
62       on attempts to send either of the real-time signals used internally  by
63       the NPTL threading implementation.  See nptl(7) for details.
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COLOPHON

70       This page is part of release 5.02 of the Linux  man-pages  project.   A
71       description  of  the project, information about reporting bugs, and the
72       latest    version    of    this    page,    can     be     found     at
73       https://www.kernel.org/doc/man-pages/.
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77Linux                             2017-09-15               PTHREAD_SIGQUEUE(3)