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26 .Dt PTHREAD_SWITCH_ADD_NP 3
29 .Nm pthread_switch_add_np ,
30 .Nm pthread_switch_delete_np
31 .Nd thread context switches debugging primitives
37 .Fn pthread_switch_add_np "pthread_switch_routine_t routine"
39 .Fn pthread_switch_delete_np "pthread_switch_routine_t routine"
41 An application is allowed to monitor the thread context switches inside
42 the threading library.
43 An application can install a routine that gets called every time a thread
44 (explicitly created by an application with the
46 function) gets the context switched.
47 The routine is passed the thread IDs of the threads that are
48 being switched in and out.
49 Installation and removal of these hooks may be done using the
50 .Fn pthread_switch_add_np
52 .Fn pthread_switch_delete_np
53 functions respectively.
56 these functions return 0.
57 Otherwise, an error number is returned to indicate the error.
60 .Fn pthread_switch_add_np
65 pointer was passed in the
71 .Fn pthread_switch_delete_np
77 argument is different from the argument previously passed to the
78 .Fn pthread_switch_add_np
82 .Xr pthread_create 3 ,
85 This manual page was written by
86 .An Alexey Zelkin Aq Mt phantom@FreeBSD.org .