int PAPI_attach( int EventSet, unsigned long tid );
PAPI_attach is a wrapper function that calls PAPI_set_opt 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 specified thread; PAPI_detach breaks that connection and restores the EventSet to the original executing thread.
EventSet An integer handle for a PAPI EventSet as created by PAPI_create_eventset.
tid A thread id as obtained from, for example, PAPI_list_threads or PAPI_thread_id.
- Return values
PAPI_ECMP This feature is unsupported on this component.
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 );
- See also
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