PTHREAD_SWITCH_ADD_NP(3)                      FreeBSD Library Functions Manual

NAME
     pthread_switch_add_np, pthread_switch_delete_np - thread context switches
     debugging primitives

LIBRARY
     POSIX Threads Library (libpthread, -lpthread)

SYNOPSIS
     #include <pthread_np.h>

     int
     pthread_switch_add_np(pthread_switch_routine_t routine);

     int
     pthread_switch_delete_np(pthread_switch_routine_t routine);

DESCRIPTION
     An application is allowed to monitor the thread context switches inside
     the threading library.  An application can install a routine that gets
     called every time a thread (explicitly created by an application with the
     pthread_create(3) function) gets the context switched.  The routine is
     passed the thread IDs of the threads that are being switched in and out.
     Installation and removal of these hooks may be done using the
     pthread_switch_add_np() and pthread_switch_delete_np() functions
     respectively.

RETURN VALUES
     If successful, these functions return 0.  Otherwise, an error number is
     returned to indicate the error.

ERRORS
     The pthread_switch_add_np() may fail if:

     [EINVAL]           NULL pointer was passed in the routine argument.

     The pthread_switch_delete_np() may fail if:

     [EINVAL]           The routine argument is different from the argument
                        previously passed to the pthread_switch_add_np()
                        function.

SEE ALSO
     pthread_create(3), pthread_np(3)

AUTHORS
     This manual page was written by Alexey Zelkin <phantom@FreeBSD.org>.

FreeBSD 13.1-RELEASE-p6        October 12, 2021        FreeBSD 13.1-RELEASE-p6