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## Conformance and Extension

### C++11 standard Thread library

| Note
C++11 standard

Table 31.2. C++11 standard Conformance

Section | Description | Status | Comments | Ticket
--- | --- | --- | --- | ---
30 | Thread support library | Yes | - | -
30.1 | General | - | - | -
30.2 | Requirements | - | - | -
30.2.1 | Template parameter names | - | - | -
30.2.2 | Exceptions | Yes | - | -
30.2.3 | Native handles | Yes | - | -
30.2.4 | Timing specifications | Yes | - | -
30.2.5 | Requirements for Lockable types | Yes | - | -
30.2.5.1 | In general | - | - | -
30.2.5.2 | BasicLockable requirements | Yes | - | -
30.2.5.3 | Lockable requirements | yes | - | -
30.2.5.4 | TimedLockable requirements | Yes | - | -
30.2.6 | decay_copy | - | - | -
30.3 | Threads | Yes | - | -
30.3.1 | Class thread | Yes | - | -
30.3.1.1 | Class thread::id | Yes | - | -
30.3.1.2 | thread constructors | Partial | - | -
30.3.1.3 | thread destructor | Yes | - | -
30.3.1.4 | thread assignment | Yes | - | -
30.3.1.5 | thread members | Yes | - | -
30.3.1.6 | thread static members | Yes | - | -
30.3.1.7 | thread specialized algorithms | Yes | - | -
30.3.2 | Namespace this_thread | Yes | - | -
30.4 | Mutual exclusion | Partial | - | -
30.4.1 | Mutex requirements | Yes | - | -
30.4.1.1 | In general | Yes | - | -
30.4.1.2 | Mutex types | Yes | - | -
30.4.1.2.1 | Class mutex | Yes | - | -
30.4.1.2.2 | Class recursive_mutex | Yes | - | -
30.4.1.3 | Timed mutex types | Yes | - | -
30.4.1.3.1 | Class timed_mutex | Yes | - | -
30.4.1.3.1 | Class recursive_timed_mutex | Yes | - | -
30.4.2 | Locks | Yes | - | -
30.4.2.1 | Class template lock_guard | Yes | - | -
30.4.2.2 | Class template unique_lock | Yes | - | -
30.4.2.2.1 | unique_lock constructors, destructor, and assignment | Yes | - | -
30.4.2.2.2 | unique_lock locking | Yes | - | -
30.4.2.2.3 | unique_lock modifiers | Yes | - | -
30.4.2.2.4 | unique_lock observers | Yes | - | -
30.4.3 | Generic locking algorithms | Partial | variadic | #6227
30.4.4 | Call once | Yes | - | -
30.4.4.1 | Struct once_flag | Yes | - | -
30.4.4.2 | Function call_once | Yes | - | -
30.5 | Condition variables | Yes | - | -
30.5.1 | Class condition_variable | Yes | - | -
30.5.2 | Class condition_variable_any | Yes | - | -
30.6 | Futures | Yes | - | -
30.6.1 | Overview | Partial | - | -
30.6.2 | Error handling | Yes | - | -
30.6.3 | Class future_error | - | - | -
30.6.4 | Shared state | - | - | -
30.6.5 | Class template promise | Yes | - | -
30.6.6 | Class template future | Yes | - | -
30.6.7 | Class template shared_future | Yes | - | -
30.6.8 | Function template async | Yes | - | -
30.6.9 | Class template packaged_task | Yes | - | -

### C++14 standard Thread library - accepted changes

| Note
C++14 on-going standard

Table 31.3. [@http://isocpp.org/files/papers/N3659.html N3659 Shared locking in C++ revision 2] Conformance

Section | Description | Status | Comments
--- | --- | --- | ---
30.4.1.4 | Shared Lockables Types | Yes | -
30.4.1.4.1 | shared_mutex class | Yes | -
30.4.2.3 | Class template shared_lock | Yes | -

### C++1y TS Concurrency - On going proposals

#### C++ Latches and Barriers

| Note
N3659 C++ Latches and Barriers

| Note
N3659 C++ Latches and Barriers

Table 31.4. C++ Latches and Barriers Conformance

Section | Description | Status | Comments
--- | --- | --- | ---
X.1 | Class latch | Partial | A new class latch has been added. The interface is a super set of the one of the proposal, taking some of the functions of the class barrier.
X.2 | Class barrier | No | Even if Boost.Thread has a class boost:barrier it doesn't provides the same kind of services. There is an experimental completion_latch that could be used instead.

#### C++ Concurrent Queues

| Note
N3533 C++ Concurrent Queues

Table 31.5. C++ Concurrent Queues Conformance

Section | Description | Status | Comments
--- | --- | --- | ---
X.1 | Conceptual interface | Partial | The interface provided has some differences respect to this proposal. All the functions having a queue_op_status are not provided. No lock-free concrete classes
X.1.1 | Basic Operations | Partial | -
X.1.1.1 | push | yes | -
X.1.1.2 | value_pop | no | renamed pull with two flavors + a ptr_pull that returns a sharted_ptr<>.
X.1.2 | Non-waiting operations | - | -
X.1.2.1 | try_push | Partial | return bool instead
X.1.2.2 | try_pop | Partial | renamed try_pull, returns null
X.1.3 | Non-blocking operations | - | -
X.1.3.1 | nonblocking_push | Partial | renamed try_push(no_block,
X.1.3.2 | nonblocking_pop | Partial | renamed try_pop(no_block,
X.1.4 | Push-front operations | No | -
X.1.5 | Closed queues | Partial | -
X.1.5.1 | close | Yes | -
X.1.5.2 | is_closed | Yes | -
X.1.5.3 | wait_push | Partial | -
X.1.5.4 | wait_pop | Partial | -
X.1.5.5 | wait_push_front | no | -
X.1.5.6 | wait_pop | Partial | -
X.1.5.6 | open | no | -
X.1.6 | Empty and Full Queues | Yes | -
X.1.6.1 | is_empty | Yes | -
X.1.6.2 | is_full | Yes | Added capacity
X.1.7 | Queue Names | No | Not considere a must for the time been.
X.1.8 | Element Type Requirements | Yes? | -
X.1.9 | Exception Handling | Yes? | -
X.1.10 | Queue Ordering | Yes? | -
X.1.11 | Lock-Free Implementations | No | waiting to stabilize the lock-based interface. Will use Boost.LockFree once it is Move aware.
X.2 | Concrete queues | Partial | -
X.2.1 | Locking Buffer Queue | Partial | classes sync_queue and a sync_bounded_queue.
X.2.1 | Lock-Free Buffer Queue | No | -
X.3 | Additional Conceptual Tools | No | -
X.3.1 | Fronts and Backs | No | -
X.3.2 | Streaming Iterators | No | -
X.3.3 | Storage Iterators | No | -
X.3.4 | Binary Interfaces | No | -
X.3.4 | Managed Indirection | No | -

#### Asynchronous Executors

While Boost.Thread implementation of executors would not use dynamic polymorphism, it is worth comparing with the current trend on the standard.

| Note
N3378 A preliminary proposal for work executors

Table 31.6. Asynchronous Executors

Section | Description | Status | Comments
--- | --- | --- | ---
30.X.1 | Class executor | No | -
30.X.1.1 | add | No | renamed with a function template submit
30.X.1.1 | num_of_pendin_closures | ?? |
30.X.2 | Class sceduled_executor | No | -
30.X.2.1 | add_at | No | renamed with a function template submit_at
30.X.2.2 | add_after | No | renamed with a function template submit_after
30.X.3 | Executor utilities functions | No | -
30.X.3.1 | default_executor | No | -
30.X.3.2 | set_default_executor | No | -
30.X.3.3 | singleton_inline_executor | No | -
30.X.4 | Concrete executor classes | No | -
30.X.4.1 | loop_executor | No | -
30.X.4.1 | serial_executor | No | -
30.X.4.1 | thread_pool | No | #8513

#### A Standardized Representation of Asynchronous Operations

| Note
N3558 A Standardized Representation of Asynchronous Operations

| Note
These functions are based on the N3634 - Improvements to std::future<T> and related APIs C++1y proposal by N. Gustafsson, A. Laksberg, H. Sutter, S. Mithani.

Table 31.7. Improvements to std::future<T> and related APIs]

Section | Description | Status | Comments
--- | --- | --- | ---
30.6.6 | Class template future | Partial | -
30.6.6.1 | then | Partial | executor interface missing #8516
30.6.6.2 | unwrap | Yes | -
30.6.6.3 | ready | Partial | is_ready
30.6.7 | Class template shared_future | Partial | -
30.6.7.1 | then | Yes | executor interface missing #8516
30.6.7.2 | unwrap | No | #XXXX
30.6.7.3 | ready | Partial | is_ready
30.6.X | Function template when_any | No | #7446
30.6.X | Function template when_all | No | #7447
30.6.X | Function template make_ready_future | Yes | -
30.6.8 | Function template async | No | executor interface missing #7448

#### C++ Stream Mutexes - C++ Stream Guards

While Boost.Thread implementation of stream mutexes differ in the approach, it is worth comparing with the current trend on the standard.

| Note
N3535 - C++ Stream Mutexes. This has been replaced already by N3678 - C++ Stream Guards.

Table 31.8. C++ C++ Stream MutexesConformance

Section | Description | Status | Comments
--- | --- | --- | ---
X.1 | Class template stream_mutex | Partial | externally_locked_stream<>
X.2.1 | constructor | Partial | externally_locked_stream needs a mutex in addition as argumement.
X.2.2 | lock | yes | -
X.2.3 | unlock | yes | -
X.2.4 | try_lock | yes | -
X.2.5 | hold | Yes | -
X.2.6 | bypass | Yes | -
X.2 | Class template stream_guard | Yes | -
X.2.1 | stream_guard | Yes | -
X.2.2 | ~stream_guard | Yes | -
X.2.3 | bypass | Yes | -
X.3 | Stream Operators | Yes | .
X.4 | Predefined Objects | No | .

| Note
N3678 - C++ Stream Guards