PAPI_attach (3)

@par C Interface:
\#include <papi.h> @n
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.

@param EventSet
    An integer handle for a PAPI EventSet as created by PAPI_create_eventset.
@param tid
    A thread id as obtained from, for example, PAPI_list_threads or PAPI_thread_id.

@retval PAPI_ECMP
    This feature is unsupported on this component.
@retval PAPI_EINVAL
    One or more of the arguments is invalid.
@retval PAPI_ENOEVST
    The event set specified does not exist.
@retval PAPI_EISRUN
    The event set is currently counting events.

@par Examples:

*   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:

PAPI_set_opt

PAPI_list_threads

PAPI_thread_id

PAPI_thread_init

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