SampleRate float64
	Programs   []*ProgramConfig
}

type ProgramConfig struct {
	// the counter names may have to be
	// repeated for each program. (e.g., if the counters are in a package
	// that is used in more than one program.)
	Name     string
	Versions []string        // versions present in a counterconfig
	Counters []CounterConfig `json:",omitempty"`
	Stacks   []CounterConfig `json:",omitempty"`
}

	}
	p.FuncIdx, err = rdu32()
	if err != nil {
		return false, err
	}
	if cap(p.Counters) < 1024 {
		p.Counters = make([]uint32, 0, 1024)
	}
	p.Counters = p.Counters[:0]
	for i := uint32(0); i < nc; i++ {
		v, err := rdu32()
		if err != nil {
			return false, err
		}
		p.Counters = append(p.Counters, v)
	}
	return true, nil

				}
				return
			}

			// There are some counters that we can't expect to see any non-zero values, like the
			// networking-related counters.
			if tc.skipCheck {
				return
			}

			// Wait until we get a non-zero perf counter data.
			if pollErr := wait.Poll(100*time.Millisecond, 5*perfCounterUpdatePeriod, func() (bool, error) {
				data, err := counter.getData()
				if err != nil {
					return false, err

				// validate response
				if tc.err != nil {
					assert.Nil(t, counter)
					assert.ErrorContains(t, err, tc.err.Error())
				} else {
					assert.NotNil(t, counter)
					assert.NoError(t, err)
					assert.Equal(t, tc.counter.Name, counter.Name)
					assert.Equal(t, tc.counter.Packets, counter.Packets)
					assert.Equal(t, tc.counter.Bytes, counter.Bytes)
				}
			}
		})
	}
}

	//       if alwaysTrue() {
	//         XYZ()                // counter update here
	//       }
	//     }
	//
	// In the instrumented version of ABC, the prolog of the function
	// will contain a series of stores to the initial portion of the
	// counter array to write number-of-counters, pkgid, funcid. Later
	// in the function there is also a store to increment a counter
	// for the block containing the call to XYZ(). If the CPU is

		if s.mode == subtractMode {
			for i := 0; i < len(data.Counters); i++ {
				if data.Counters[i] != 0 {
					val.Counters[i] = 0
				}
			}
		} else if s.mode == intersectMode {
			s.imm[key] = struct{}{}
			for i := 0; i < len(data.Counters); i++ {
				if data.Counters[i] == 0 {
					val.Counters[i] = 0
				}
			}
		}
	}
}

			towr = len(buf)
		} else {
			panic("internal error: bad counter flavor")
		}
		if sz, err := ws.Write(buf); err != nil {
			return err
		} else if sz != towr {
			return fmt.Errorf("writing counters: short write")
		}
		return nil
	}

	// Write out entries for each live function.
	emitter := func(pkid uint32, funcid uint32, counters []uint32) error {
		cfw.csh.FcnEntries++

			}
			wroteNext = true
		} else {
			c.next.Store(next)
		}
		if f.counters.CompareAndSwap(head, c) {
			debugPrintf("registered %s %p\n", c.Name(), f.counters.Load())
			return
		}
		debugPrintf("register %s cas2 failed %p %p\n", c.Name(), f.counters.Load(), head)
	}
}

// invalidateCounters marks as invalid all the pointers
// held by f's counters and then refreshes them.
//

	Add(name string) error
	// Get retrieves the nfacct counter with the specified name, returning an error if it doesn't exist.
	Get(name string) (*Counter, error)
	// List retrieves all nfacct counters.
	List() ([]*Counter, error)

		if err != nil {
			return nil, handleError(err)
		}
		counters = append(counters, counter)
	}
	return counters, nil
}

var ErrObjectNotFound = errors.New("object not found")
var ErrObjectAlreadyExists = errors.New("object already exists")
var ErrNameExceedsMaxLength = fmt.Errorf("object name exceeds the maximum allowed length of %d characters", MaxLength)
var ErrEmptyName = errors.New("object name cannot be empty")