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pthread_switch_add_np(3)

NAME

     pthread_switch_add_np, pthread_switch_delete_np -- thread context
     switches debugging primitives

LIBRARY

     Reentrant C Library (libc_r, -lc_r)

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 respec-
     tively.

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() func-
			tion.

SEE ALSO

     pthread_create(3)

AUTHORS

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

FreeBSD 5.4		       February 13, 2003		   FreeBSD 5.4

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