PAPI_detach(3)

NAME
PAPI_detach - Detach PAPI event set from previously specified thread id and restore to executing thread.

SYNOPSIS

Detailed Description

C Interface:
    #include <papi.h>
    int PAPI_detach( int EventSet, unsigned long tid );

PAPI_detach 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.

Parameters
    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.

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

Author

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