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## Conformance and Extension

### C++11 standard Thread library

| Note
C++11 - Standard for Programming Language C++

]

Table 30.2. 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 | - | -

Table 30.3. Extension

Section | Description | Comments
--- | --- | ---
30.3.1.5.x | interrupt | -
30.3.2.x | Interruption | -
30.3.2.y | at_thread_exit | -
30.4.3.x | Generic locking algorithms begin/end | -

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

| Note
Working Draft, Standard for Programming Language C++

Table 30.4. [@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++14 TS Extensions for Concurrency V1

| Note
N4107-Extensions for Concurrency

Table 30.5. Improvements to std::future<T> and related APIs]

Section | Description | Status | Comments
--- | --- | --- | ---
2.1 | - | - | -
2.2 | Class template future | Partial | -
2.2 | then | Partial | without implicit unwrapping #10550 and blocking #10551
2.2 | is_ready | Yes | -
2.3 | Class template shared_future | Partial | -
2.3 | then | Partial | Without implicit unwrapping #10550 and blocking #10551
2.3 | is_ready | Yes | -
2.4 | Function template when_all | Partial | interface not complete #10426 and blocking #10551
2.5 | Function template when_any | Partial | interface not complete #10427 and blocking #10551
2.6 | Function template when_any_back | No | #XXXX
2.7 | Function template make_ready_future | Yes | -

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

#### C++ Latches and Barriers

| Note
N3600 C++ Latches and Barriers

| Note
N3817 C++ Latches and Barriers

Table 30.6. 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 30.7. 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 | renamed push_back.
X.1.1.2 | value_pop | no | renamed pull_front with two flavors.
X.1.2 | Non-waiting operations | - | -
X.1.2.1 | try_push | yes | renamed try_push_back
X.1.2.2 | try_pop | yes | renamed try_pull_back
X.1.3 | Non-blocking operations | - | -
X.1.3.1 | nonblocking_push | Yes | renamed nonblocking_push_back
X.1.3.2 | nonblocking_pop | Yes | renamed nonblocking_pull_front
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 | renamed closed
X.1.5.3 | wait_push | Yes | renamed wait_push_back
X.1.5.4 | wait_pop | Yes | renamed wait_pull_front
X.1.5.5 | wait_push_front | no | -
X.1.5.6 | wait_pop_back | no | -
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 considered 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 Boost.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 | waiting to stabilize the lock-based interface. Will use Boost.LockFree once it is Boost.Move aware.
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

| Note
N3785 Executors and Schedulers

Table 30.8. Asynchronous Executors

Section | Description | Status | Comments
--- | --- | --- | ---
V.1.1 | Class executor | Yes | -
V.1.1 | add | Yes | renamed with a function template submit
V.1.1 | num_of_pendin_closures | No |
V.1.2 | Class sceduled_executor | No | -
V.1.2 | add_at | No | renamed with a function template submit_at
V.1.2 | add_after | No | renamed with a function template submit_after
V.2 | Concrete executor classes | No | -
V.2.1 | thread_pool | Yes | static version Basic_thread_pool, dynamic one execduler_adaptor<basic_thread_pool>
V.2.2 | serial_executor | yes | -
V.2.3 | loop_executor | Yes | static version loop_scheduler, dynamic one execduler_adaptor<loop_scheduler>
V.2.4 | inline_executor | Yes | static version inline_executor, dynamic one execduler_adaptor<inline_executor>
V.2.5 | thread_executor | Yes | static version thread_executor, dynamic one execduler_adaptor<thread_executor>

| Note
N3784-Improvements to `std::future<T> and Related APIs

Table 30.9. `async, future/shared_future::then`and Executors

Section | Description | Status | Comments
--- | --- | --- | ---
30.6.6 | `future<T>::then` | Yes |
30.6.7 | `shared_future<T>::then` | Yes |
30.6.8 | `async` | Yes | -

#### 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
These functions are based on N3535 - C++ Stream Mutexes by Lawrence Crowl.

| Note
This proposal has been replaced already by N3678 - C++ Stream Guards, which has been replaced by N3665 - Uninterleaved String Output Streaming and N3750 - C++ Ostream Buffers

Table 30.10. C++ Stream Mutexes Conformance

Section | Description | Status | Comments
--- | --- | --- | ---
X.1 | Class template stream_mutex | Partial | Renamed externally_locked_stream<>
X.2.1 | constructor | Partial | externally_locked_stream needs a mutex in addition as argument.
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 | -