...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Boost.Thread is configured following the conventions used to build libraries with separate source code. Boost.Thread will import/export the code only if the user has specifically asked for it, by defining either BOOST_ALL_DYN_LINK if they want all boost libraries to be dynamically linked, or BOOST_THREAD_DYN_LINK if they want just this one to be dynamically liked.
The definition of these macros determines whether BOOST_THREAD_USE_DLL is defined. If BOOST_THREAD_USE_DLL is not defined, the library will define BOOST_THREAD_USE_DLL or BOOST_THREAD_USE_LIB depending on whether the platform. On non windows platforms BOOST_THREAD_USE_LIB is defined if is not defined. In windows platforms, BOOST_THREAD_USE_LIB is defined if BOOST_THREAD_USE_DLL and the compiler supports auto-tss cleanup with Boost.Threads (for the time been Msvc and Intel)
The source code compiled when building the library defines a macros BOOST_THREAD_SOURCE that is used to import or export it. The user must not define this macro in any case.
Boost.Thread depends on some non header-only libraries.
It seems that there are some IDE (as e.g. Visual Studio) that deduce the libraries that a program needs to link to inspecting the sources. Such IDE could force to link to Boost.DateTime and/or Boost.Chrono.
As the single mandatory dependency is to Boost.System, the following
bjam toolset=msvc-11.0 --build-type=complete --with-thread
will install only boost_thread and boost_system.
Users of such IDE should force the Boost.Chrono and Boost.DateTime build using
bjam toolset=msvc-11.0 --build-type=complete --with-thread --with-chrono --with-date_time
The following section describes all the macros used to configure Boost.Thread.
boost::thread::operator==
deprecatedTable 33.1. Default Values for Configurable Features
Feature |
Anti-Feature |
V2 |
V3 |
V4 |
---|---|---|---|---|
USES_CHRONO |
DONT_USE_CHRONO |
YES/NO |
YES/NO |
YES/NO |
PROVIDES_INTERRUPTIONS |
DONT_PROVIDE_INTERRUPTIONS |
YES |
YES |
YES |
THROW_IF_PRECONDITION_NOT_SATISFIED |
- |
NO |
NO |
NO |
PROVIDES_PROMISE_LAZY |
DONT_PROVIDE_PROMISE_LAZY |
YES |
NO |
NO |
PROVIDES_BASIC_THREAD_ID |
DONT_PROVIDE_BASIC_THREAD_ID |
NO |
YES |
YES |
PROVIDES_GENERIC_SHARED_MUTEX_ON_WIN |
DONT_PROVIDE_GENERIC_SHARED_MUTEX_ON_WIN |
NO |
YES |
YES |
PROVIDES_SHARED_MUTEX_UPWARDS_CONVERSION |
DONT_PROVIDE_SHARED_MUTEX_UPWARDS_CONVERSION |
NO |
YES |
YES |
PROVIDES_EXECUTORS |
- |
NO |
NO |
NO |
PROVIDES_EXPLICIT_LOCK_CONVERSION |
DONT_PROVIDE_EXPLICIT_LOCK_CONVERSION |
NO |
YES |
YES |
PROVIDES_FUTURE |
DONT_PROVIDE_FUTURE |
NO |
YES |
YES |
PROVIDES_FUTURE_CTOR_ALLOCATORS |
DONT_PROVIDE_FUTURE_CTOR_ALLOCATORS |
NO |
YES |
YES |
PROVIDES_THREAD_DESTRUCTOR_CALLS_TERMINATE_IF_JOINABLE |
DONT_PROVIDE_THREAD_DESTRUCTOR_CALLS_TERMINATE_IF_JOINABLE |
NO |
YES |
YES |
PROVIDES_THREAD_MOVE_ASSIGN_CALLS_TERMINATE_IF_JOINABLE |
DONT_PROVIDE_THREAD_MOVE_ASSIGN_CALLS_TERMINATE_IF_JOINABLE |
NO |
YES |
YES |
PROVIDES_ONCE_CXX11 |
DONT_PROVIDE_ONCE_CXX11 |
NO |
YES |
YES |
USES_MOVE |
DONT_USE_MOVE |
NO |
YES |
YES |
USES_DATETIME |
DONT_USE_DATETIME |
YES/NO |
YES/NO |
YES/NO |
PROVIDES_THREAD_EQ |
DONT_PROVIDE_THREAD_EQ |
YES |
YES |
NO |
PROVIDES_CONDITION |
DONT_PROVIDE_CONDITION |
YES |
YES |
NO |
PROVIDES_NESTED_LOCKS |
DONT_PROVIDE_NESTED_LOCKS |
YES |
YES |
NO |
PROVIDES_SIGNATURE_PACKAGED_TASK |
DONT_PROVIDE_SIGNATURE_PACKAGED_TASK |
NO |
NO |
YES |
PROVIDES_FUTURE_INVALID_AFTER_GET |
DONT_PROVIDE_FUTURE_INVALID_AFTER_GET |
NO |
NO |
YES |
PROVIDES_VARIADIC_THREAD |
DONT_PROVIDE_VARIADIC_THREAD |
NO |
NO |
C++11 |
Boost.Thread uses by default Boost.Chrono for the time related functions
and define BOOST_THREAD_USES_CHRONO
if BOOST_THREAD_DONT_USE_CHRONO
is not defined. The user should define BOOST_THREAD_DONT_USE_CHRONO
for compilers that don't work well with Boost.Chrono.
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Warning |
---|---|
When defined BOOST_THREAD_PLATFORM_WIN32 BOOST_THREAD_USES_CHRONO is defined independently of user settings. |
Boost.Thread uses by default an internal move semantic implementation. Since version 3.0.0 you can use the move emulation emulation provided by Boost.Move.
When BOOST_THREAD_VERSION==2
define
BOOST_THREAD_USES_MOVE
if you want to use Boost.Move interface. When BOOST_THREAD_VERSION>=3
define
BOOST_THREAD_DONT_USE_MOVE
if you don't want to use Boost.Move interface.
The Boost.DateTime time related functions introduced in Boost 1.35.0, using the Boost.Date_Time library are deprecated. These include (but are not limited to):
When BOOST_THREAD_VERSION<=3
&&
defined BOOST_THREAD_PLATFORM_PTHREAD define BOOST_THREAD_DONT_USE_DATETIME
if you don't want to use Boost.DateTime related interfaces. When BOOST_THREAD_VERSION>3
&& defined BOOST_THREAD_PLATFORM_PTHREAD
define BOOST_THREAD_USES_DATETIME
if you want to use Boost.DateTime related interfaces.
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Warning |
---|---|
When defined BOOST_THREAD_PLATFORM_WIN32 BOOST_THREAD_USES_DATETIME is defined independently of user settings. |
Boost.Thread uses by default Boost.Atomic in POSIX platforms to implement call_once..
Define BOOST_THREAD_USES_ATOMIC
if you want to use Boost.Atomic. Define BOOST_THREAD_DONT_USE_ATOMIC
if you don't want to use Boost.Atomic or if it is not supported
in your platform.
The following operators are deprecated:
boost::thread::operator==
boost::thread::operator!=
When BOOST_THREAD_PROVIDES_THREAD_EQ
is defined Boost.Thread provides these deprecated feature.
Use instead
boost::thread::id::operator==
boost::thread::id::operator!=
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Warning |
---|---|
This is a breaking change respect to version 1.x. |
When BOOST_THREAD_VERSION>=4
define
BOOST_THREAD_PROVIDES_THREAD_EQ
if you want this feature. When BOOST_THREAD_VERSION<4
define
BOOST_THREAD_DONT_PROVIDE_THREAD_EQ
if you don't want this feature.
boost::condition
is deprecated. When BOOST_THREAD_PROVIDES_CONDITION
is defined
Boost.Thread provides this deprecated feature.
Use instead boost::condition_variable_any
.
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Warning |
---|---|
This is a breaking change respect to version 1.x. |
When BOOST_THREAD_VERSION>3
define
BOOST_THREAD_PROVIDES_CONDITION
if you want this feature. When BOOST_THREAD_VERSION<=3
define
BOOST_THREAD_DONT_PROVIDE_CONDITION
if you don't want this feature.
The following nested typedefs are deprecated:
boost::mutex::scoped_lock
,
boost::mutex::scoped_try_lock
,
boost::timed_mutex::scoped_lock
boost::timed_mutex::scoped_try_lock
boost::timed_mutex::timed_scoped_timed_lock
boost::recursive_mutex::scoped_lock
,
boost::recursive_mutex::scoped_try_lock
,
boost::recursive_timed_mutex::scoped_lock
boost::recursive_timed_mutex::scoped_try_lock
boost::recursive_timed_mutex::timed_scoped_timed_lock
When BOOST_THREAD_PROVIDES_NESTED_LOCKS
is defined Boost.Thread provides these deprecated feature.
Use instead * boost::unique_lock<boost::mutex>
,
* boost::unique_lock<boost::mutex>
with the try_to_lock_t
constructor, * boost::unique_lock<boost::timed_mutex>
* boost::unique_lock<boost::timed_mutex>
with the try_to_lock_t
constructor * boost::unique_lock<boost::timed_mutex>
* boost::unique_lock<boost::recursive_mutex>
,
* boost::unique_lock<boost::recursive_mutex>
with the try_to_lock_t
constructor, * boost::unique_lock<boost::recursive_timed_mutex>
* boost::unique_lock<boost::recursive_timed_mutex>
with the try_to_lock_t
constructor * boost::unique_lock<boost::recursive_timed_mutex>
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Warning |
---|---|
This is a breaking change respect to version 1.x. |
When BOOST_THREAD_VERSION>=4
define
BOOST_THREAD_PROVIDES_NESTED_LOCKS
if you want these features. When BOOST_THREAD_VERSION<4
define
BOOST_THREAD_DONT_PROVIDE_NESTED_LOCKS
if you don't want thes features.
Boost.Thread uses by default a thread::id on Posix based on the pthread
type (BOOST_THREAD_PROVIDES_BASIC_THREAD_ID). For backward compatibility
and also for compilers that don't work well with this modification the
user can define BOOST_THREAD_DONT_PROVIDE_BASIC_THREAD_ID
.
Define BOOST_THREAD_DONT_PROVIDE_BASIC_THREAD_ID
if you don't want these features.
The shared mutex implementation on Windows platform provides currently
less functionality than the generic one that is used for PTheads based
platforms. In order to have access to these functions, the user needs to
define BOOST_THREAD_PROVIDES_GENERIC_SHARED_MUTEX_ON_WIN
to use the generic implementation, that while could be less efficient,
provides all the functions.
When BOOST_THREAD_VERSION==2
define
BOOST_THREAD_PROVIDES_GENERIC_SHARED_MUTEX_ON_WIN
if you want these features. When BOOST_THREAD_VERSION>=3
define
BOOST_THREAD_DONT_PROVIDE_GENERIC_SHARED_MUTEX_ON_WIN
if you don't want these features.
Boost.Threads includes in version 3 the Shared Locking Upwards Conversion
as defined in Shared
Locking. These conversions need to be used carefully to avoid deadlock
or livelock. The user need to define explicitly BOOST_THREAD_PROVIDES_SHARED_MUTEX_UPWARDS_CONVERSION
to get these upwards conversions.
When BOOST_THREAD_VERSION==2
define
BOOST_THREAD_PROVIDES_SHARED_MUTEX_UPWARDS_CONVERSION
if you want these features. When BOOST_THREAD_VERSION>=3
define
BOOST_THREAD_DONT_PROVIDE_SHARED_MUTEX_UPWARDS_CONVERSION
if you don't want these features.
In Shared
Locking the lock conversions are explicit. As this explicit conversion
breaks the lock interfaces, it is provided only if the BOOST_THREAD_PROVIDES_EXPLICIT_LOCK_CONVERSION
is defined.
When BOOST_THREAD_VERSION==2
define
BOOST_THREAD_PROVIDES_EXPLICIT_LOCK_CONVERSION
if you want these features. When BOOST_THREAD_VERSION==3
define
BOOST_THREAD_DONT_PROVIDE_EXPLICIT_LOCK_CONVERSION
if you don't want these features.
C++11 uses std::future
. Versions of Boost.Thread previous
to version 3.0.0 uses boost:unique_future
.
Since version 3.0.0 boost::future
replaces boost::unique_future
when BOOST_THREAD_PROVIDES_FUTURE
is defined. The documentation doesn't contains anymore however boost::unique_future
.
When BOOST_THREAD_VERSION==2
define
BOOST_THREAD_PROVIDES_FUTURE
if you want to use boost::future. When BOOST_THREAD_VERSION>=3
define
BOOST_THREAD_DONT_PROVIDE_FUTURE
if you want to use boost::unique_future.
C++11 promise initialize the associated state at construction time. Versions of Boost.Thread previous to version 3.0.0 initialize it lazily at any point in time in which this associated state is needed.
Since version 3.0.0 this difference in behavior can be configured. When
BOOST_THREAD_PROVIDES_PROMISE_LAZY
is defined the backward compatible behavior is provided.
When BOOST_THREAD_VERSION==2
define
BOOST_THREAD_DONT_PROVIDE_PROMISE_LAZY
if you want to use boost::future. When BOOST_THREAD_VERSION>=3
define
BOOST_THREAD_PROVIDES_PROMISE_LAZY
if you want to use boost::unique_future.
C++11 std::promise provides constructors with allocators.
template <typename R> class promise { public: template <class Allocator> explicit promise(allocator_arg_t, Allocator a); // ... }; template <class R, class Alloc> struct uses_allocator<promise<R>,Alloc>: true_type {};
where
struct allocator_arg_t { }; constexpr allocator_arg_t allocator_arg = allocator_arg_t(); template <class T, class Alloc> struct uses_allocator;
Since version 3.0.0 Boost.Thread implements this constructor using the following interface
namespace boost { typedef container::allocator_arg_t allocator_arg_t; constexpr allocator_arg_t allocator_arg = {}; namespace container { template <class R, class Alloc> struct uses_allocator<promise<R>,Alloc>: true_type {}; } template <class T, class Alloc> struct uses_allocator : public container::uses_allocator<T, Alloc> {}; }
which introduces a dependency on Boost.Container. This feature is provided
only if BOOST_THREAD_PROVIDES_FUTURE_CTOR_ALLOCATORS
is defined.
When BOOST_THREAD_VERSION==2
define
BOOST_THREAD_PROVIDES_FUTURE_CTOR_ALLOCATORS
if you want these features. When BOOST_THREAD_VERSION>=3
define
BOOST_THREAD_DONT_PROVIDE_FUTURE_CTOR_ALLOCATORS
if you don't want these features.
C++11 has a different semantic for the thread destructor and the move assignment.
Instead of detaching the thread, calls to terminate() if the thread was
joinable. When BOOST_THREAD_PROVIDES_THREAD_DESTRUCTOR_CALLS_TERMINATE_IF_JOINABLE
and BOOST_THREAD_PROVIDES_THREAD_MOVE_ASSIGN_CALLS_TERMINATE_IF_JOINABLE
is defined Boost.Thread provides the C++ semantic.
When BOOST_THREAD_VERSION==2
define
BOOST_THREAD_PROVIDES_THREAD_DESTRUCTOR_CALLS_TERMINATE_IF_JOINABLE
if you want these features. When BOOST_THREAD_VERSION>=3
define
BOOST_THREAD_DONT_PROVIDE_THREAD_DESTRUCTOR_CALLS_TERMINATE_IF_JOINABLE
if you don't want these features.
When BOOST_THREAD_VERSION==2
define
BOOST_THREAD_PROVIDES_THREAD_MOVE_ASSIGN_CALLS_TERMINATE_IF_JOINABLE
if you want these features. When BOOST_THREAD_VERSION>=3
define
BOOST_THREAD_DONT_PROVIDE_THREAD_MOVE_ASSIGN_CALLS_TERMINATE_IF_JOINABLE
if you don't want these features.
C++11 defines a default constructor for once_flag. When BOOST_THREAD_PROVIDES_ONCE_CXX11
is defined Boost.Thread provides this C++ semantics. In this case,
the previous aggregate syntax is not supported.
boost::once_flag once = BOOST_ONCE_INIT;
You should now just do
boost::once_flag once;
When BOOST_THREAD_VERSION==2
define
BOOST_THREAD_PROVIDES_ONCE_CXX11
if you want these features. When BOOST_THREAD_VERSION>=3
define
BOOST_THREAD_DONT_PROVIDE_ONCE_CXX11
if you don't want these features.
C++11 packaged task class has a Signature template parameter. When BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK
is defined Boost.Thread provides this C++ feature.
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Warning |
---|---|
This is a breaking change respect to version 3.x. |
When BOOST_THREAD_VERSION<4
define
BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK
if you want this feature. When BOOST_THREAD_VERSION>=4
define
BOOST_THREAD_DONT_PROVIDE_SIGNATURE_PACKAGED_TASK
if you don't want this feature.
C++11 thread constructor accep a variable number of rvalue argumentshas.
When BOOST_THREAD_PROVIDES_VARIADIC_THREAD
is defined Boost.Thread provides this C++ feature if the following
are not defined
When BOOST_THREAD_VERSION>4
define
BOOST_THREAD_DONT_PROVIDE_VARIADIC_THREAD
if you don't want this feature.
C++11 future<>::get() invalidates the future once its value has been
obtained. When BOOST_THREAD_PROVIDES_FUTURE_INVALID_AFTER_GET
is defined Boost.Thread provides this C++ feature.
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Warning |
---|---|
This is a breaking change respect to version 3.x. |
When BOOST_THREAD_VERSION<4
define
BOOST_THREAD_PROVIDES_FUTURE_INVALID_AFTER_GET
if you want this feature. When BOOST_THREAD_VERSION>=4
define
BOOST_THREAD_DONT_PROVIDE_FUTURE_INVALID_AFTER_GET
if you don't want this feature.
Thread interruption, while useful, makes any interruption point less efficient than if the thread were not interruptible.
When BOOST_THREAD_PROVIDES_INTERRUPTIONS
is defined Boost.Thread provides interruptions. When BOOST_THREAD_DONT_PROVIDE_INTERRUPTIONS
is defined Boost.Thread don't provide interruption.
Boost.Thread defines BOOST_THREAD_PROVIDES_INTERRUPTIONS if neither BOOST_THREAD_PROVIDES_INTERRUPTIONS nor BOOST_THREAD_DONT_PROVIDE_INTERRUPTIONS are defined, so that there is no compatibility break.
BOOST_THREAD_VERSION
defines
the Boost.Thread version. The default version is 2. In this case the following
breaking or extending macros are defined if the opposite is not requested:
BOOST_THREAD_PROVIDES_PROMISE_LAZY
The user can request the version 3 by defining BOOST_THREAD_VERSION
to 3. In this case the following breaking or extending macros are defined
if the opposite is not requested:
BOOST_THREAD_PROVIDES_EXPLICIT_LOCK_CONVERSION
BOOST_THREAD_PROVIDES_FUTURE
BOOST_THREAD_PROVIDES_GENERIC_SHARED_MUTEX_ON_WIN
BOOST_THREAD_PROVIDES_SHARED_MUTEX_UPWARDS_CONVERSION
BOOST_THREAD_PROVIDES_FUTURE_CTOR_ALLOCATORS
BOOST_THREAD_PROVIDES_ONCE_CXX11
BOOST_THREAD_DONT_PROVIDE_PROMISE_LAZY
The user can request the version 4 by defining BOOST_THREAD_VERSION
to 4. In this case the following breaking or extending macros are defined
if the opposite is not requested:
BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK
BOOST_THREAD_PROVIDES_FUTURE_INVALID_AFTER_GET
BOOST_THREAD_PROVIDES_VARIADIC_THREAD
BOOST_THREAD_DONT_PROVIDE_THREAD_EQ
BOOST_THREAD_DONT_USE_DATETIME
Some compilers don't work correctly with some of the added features.
If __SUNPRO_CC < 0x5100 the library defines
BOOST_THREAD_DONT_USE_MOVE
If __SUNPRO_CC < 0x5100 the library defines
BOOST_THREAD_DONT_PROVIDE_FUTURE_CTOR_ALLOCATORS
If __IBMCPP__ < 1100 the library defines
BOOST_THREAD_DONT_USE_CHRONO
BOOST_THREAD_USES_DATE
And Boost.Thread doesn't links with Boost.Chrono.
If _WIN32_WCE && _WIN32_WCE==0x501 the library defines
BOOST_THREAD_DONT_PROVIDE_FUTURE_CTOR_ALLOCATORS