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PTHREAD_SIGQUEUE(3)        Linux Programmer's ManualPTHREAD_SIGQUEUE(3)NAME       pthread_sigqueue - queue a signal and data to a threadSYNOPSIS       #include <signal.h>       #include <pthread.h>       int pthread_sigqueue(pthread_t thread, int sig,                            const union sigval value);       Compile and link with -pthread.   Feature Test Macro Requirements for glibc (seefeature_test_macros(7)):       pthread_sigqueue(): _GNU_SOURCEDESCRIPTION       The pthread_sigqueue() function performs a similar task tosigqueue(3),       but, rather than sending a signal to a process, it sends a signal to  a       thread in the same process as the calling thread.       The  thread  argument  is the ID of a thread in the same process as the       caller.  The sig argument specifies the signal to be sent.   The  value       argument  specifies  data  to accompany the signal; seesigqueue(3) for       details.RETURN VALUE       On success, pthread_sigqueue() returns 0; on error, it returns an error       number.ERRORS       EAGAIN The limit of signals which may be queued has been reached.  (Seesignal(7) for further information.)       EINVAL sig was invalid.       ENOSYS pthread_sigqueue() is not supported on this system.       ESRCH  thread is not valid.VERSIONS       The pthread_sigqueue() function first appeared in glibc 2.11.ATTRIBUTES       For an  explanation  of  the  terms  used  in  this  section,  see  at-tributes(7).       +-------------------+---------------+---------+       |Interface          | Attribute     | Value   |       +-------------------+---------------+---------+       |pthread_sigqueue() | Thread safety | MT-Safe |       +-------------------+---------------+---------+CONFORMING TO       This function is a GNU extension.NOTES       The  glibc implementation of pthread_sigqueue() gives an error (EINVAL)       on attempts to send either of the real-time signals used internally  by       the NPTL threading implementation.  Seenptl(7) for details.SEE ALSOrt_tgsigqueueinfo(2),sigaction(2),pthread_sigmask(3),sigqueue(3),sigwait(3),pthreads(7),signal(7)COLOPHON       This page is part of release 5.05 of the Linux  man-pages  project.   A       description  of  the project, information about reporting bugs, and the       latest    version    of    this    page,    can     be     found     at       https://www.kernel.org/doc/man-pages/.Linux                             2017-09-15PTHREAD_SIGQUEUE(3)