PTHREAD_SWITCH_ADD_NP(3)				   BSD Library Functions Manual 				  PTHREAD_SWITCH_ADD_NP(3)

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)

AUTHORS

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

BSD
								 February 13, 2003							       BSD