#include <papi.h> int PAPI_attach(int EventSet, unsigned long tid ); int PAPI_detach(int EventSet );
PAPI_attach() and PAPI_detach() are wrapper functions that access PAPI_set_opt() (3) to allow PAPI to monitor performance counts on a thread other than the one currently executing. This is sometimes referred to as third party monitoring. PAPI_attach() connects the specified EventSet to the specifed thread; PAPI_detach() breaks that connection and restores the EventSet to the original executing thread.
EventSet -- an integer handle for a PAPI Event Set as created by PAPI_create_eventset (3)
tid -- a thread id as obtained from, for example, PAPI_list_threads (3) or PAPI_thread_id (3).
PAPI_ESBSTR This feature is unsupported on this substrate.
PAPI_EINVAL One or more of the arguments is invalid.
PAPI_ENOEVST The event set specified does not exist.
PAPI_EISRUN The event set is currently counting events.
int EventSet = PAPI_NULL; unsigned long pid; pid = fork(); if (pid <= 0) exit(1); if (PAPI_create_eventset(&EventSet) != PAPI_OK) exit(1); /* Add Total Instructions Executed to our EventSet */ if (PAPI_add_event(EventSet, PAPI_TOT_INS) != PAPI_OK) exit(1); /* Attach this EventSet to the forked process */ if (PAPI_attach(EventSet, pid) != PAPI_OK) exit(1);
There are no known bugs in these functions.