artdaq::detail Namespace Reference

artdaq implementation details namespace More...

Classes
class	hasMemoryUsed
struct	RawFragmentHeader
	The RawFragmentHeader class contains the basic fields used by artdaq for routing Fragment objects through the system. More...
struct	RawFragmentHeaderV0
	The RawFragmentHeaderV0 class contains the basic fields used by artdaq for routing Fragment objects through the system. More...
struct	RawEventHeader
	The header information used to identify key properties of the RawEvent object. More...

Typedefs
typedef std::chrono::duration < double >	seconds
typedef size_t	MemoryType
	Basic unit of data storage and pointer types.

Functions
template<typename T >
MemoryType	memoryUsage (const std::pair< T, size_t > &t)
	Returns the memory used by an object. More...
template<typename T >
std::enable_if< hasMemoryUsed < T >::value, MemoryType > ::type	memoryUsage (const T &t)
	Returns the memory used by an object. Uses hasMemoryUsed to determine if there is a memoryUsed function in object. More...
template<typename T >
std::enable_if<!hasMemoryUsed < T >::value, MemoryType > ::type	memoryUsage (const T &t)
	Returns the memory used by an object, as obtained through sizeof. More...

Detailed Description

artdaq implementation details namespace

Class template ConcurrentQueue provides a FIFO that can be used to communicate data between multiple producer and consumer threads in an application.

The template policy EnqPolicy determines the behavior of the enqNowait function. In all cases, this function will return promptly (that is, it will not wait for a full queue to become not-full). However, what is done in the case of the queue being full depends on the policy chosen:

FailIfFull: a std::exeption is thrown if the queue is full.

KeepNewest: the head of the FIFO is popped (and destroyed), and the new item is added to the FIFO. The function returns the number of popped (dropped) element.

RejectNewest: the new item is not put onto the FIFO. The function returns the dropped event count (1) if the item cannot be added.

Typedef Documentation

typedef std::chrono::duration<double> artdaq::detail::seconds

We shall use artdaq::detail::seconds as our "standard" duration type. Note that this differs from std::chrono::seconds, which has a representation in some integer type of at least 35 bits.

daqrate::duration dur(1.0) represents a duration of 1 second. daqrate::duration dur2(0.001) represents a duration of 1 millisecond.

Definition at line 62 of file ConcurrentQueue.hh.

Function Documentation

template<typename T >

MemoryType artdaq::detail::memoryUsage

(

const std::pair< T, size_t > &

t

)

Returns the memory used by an object.

Template Parameters

T	The type of the object

Parameters

t	A pair of object and size_t

Returns

If the object has a memoryUsed function, the result of that function. Otherwise 0.

Definition at line 111 of file ConcurrentQueue.hh.

template<typename T >

std::enable_if<hasMemoryUsed<T>::value, MemoryType>::type artdaq::detail::memoryUsage

(

const T &

t

)

Returns the memory used by an object. Uses hasMemoryUsed to determine if there is a memoryUsed function in object.

Template Parameters

T	Type of object t

Parameters

t	Object to retrieve memory usage from

Returns

Self-reported memory usage of object

Definition at line 130 of file ConcurrentQueue.hh.

template<typename T >

std::enable_if<!hasMemoryUsed<T>::value, MemoryType>::type artdaq::detail::memoryUsage

(

const T &

t

)

Returns the memory used by an object, as obtained through sizeof.

Template Parameters

T	Type of object t

Parameters

t	Object to retrieve memory usage from

Returns

sizeof(t)

Definition at line 149 of file ConcurrentQueue.hh.