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[/
(C) Copyright 2007-11 Anthony Williams.
(C) Copyright 2011-12 Vicente J. Botet Escriba.
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt).
]
[section:changes History]
[heading Version 4.0.0 - boost 1.53]
Breaking changes:
BOOST_THREAD_VERSION==3 by default since Boost 1.53. So that all the deprecated features since 1.50 are not included by default. You can change this by setting the appropriated define (see Configuration section).
Deprecated Features:
Deprecated features since boost 1.53 available only until boost 1.58:
* packaged_task<R> is deprecated, use instead packaged_task<R()>. See BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK and BOOST_THREAD_DONT_PROVIDE_SIGNATURE_PACKAGED_TASK
New Features:
* [@http://svn.boost.org/trac/boost/ticket/7281 #7281] C++11 compliance: Add ArgTypes to packaged_task template.
Provided when BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK is defined (Default value from Boost 1.55).
See BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK and BOOST_THREAD_DONT_PROVIDE_SIGNATURE_PACKAGED_TASK.
* [@http://svn.boost.org/trac/boost/ticket/6270 #6270] c++11 compliance: Add thread constructor from movable callable and movable arguments
Provided when BOOST_THREAD_PROVIDES_VARIADIC_THREAD is defined (Default value from Boost 1.55):
See BOOST_THREAD_PROVIDES_VARIADIC_THREAD and BOOST_THREAD_DONT_PROVIDE_VARIADIC_THREAD.
* [@http://svn.boost.org/trac/boost/ticket/7412 #7412] c++11 compliance: Add async from movable callable and movable arguments
Provided when BOOST_THREAD_PROVIDES_VARIADIC_THREAD and BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK are defined (Default value from Boost 1.55):
See BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK and BOOST_THREAD_DONT_PROVIDE_SIGNATURE_PACKAGED_TASK, BOOST_THREAD_PROVIDES_VARIADIC_THREAD and BOOST_THREAD_DONT_PROVIDE_VARIADIC_THREAD.
* [@http://svn.boost.org/trac/boost/ticket/7414 #7414] c++11 compliance: future::get post-condition should be valid()==false
* [@http://svn.boost.org/trac/boost/ticket/7414 #7444] Async: Add make_future/make_shared_future
[/* [@http://svn.boost.org/trac/boost/ticket/7413 #7413] c++11 compliance: Add async when the launch policy is deferred.]
Fixed Bugs:
[heading Version 3.1.0 - boost 1.52]
Deprecated Features:
Deprecated features since boost 1.50 available only until boost 1.55:
These deprecated features will be provided by default up to boost 1.52. If you don't want to include the deprecated features you could define BOOST_THREAD_DONT_PROVIDE_DEPRECATED_FEATURES_SINCE_V3_0_0. Since 1.53 these features will not be included any more by default. Since this version, if you want to include the deprecated features yet you could define BOOST_THREAD_PROVIDE_DEPRECATED_FEATURES_SINCE_V3_0_0. These deprecated features will be only available until boost 1.55, that is you have yet 1 year to move to the new features.
* Time related functions don't using the Boost.Chrono library, use the chrono overloads instead.
Breaking changes when BOOST_THREAD_VERSION==3 (Default value since Boost 1.53):
There are some new features which share the same interface but with different behavior. These breaking features are provided by default when BOOST_THREAD_VERSION is 3, but the user can however choose the version 2 behavior by defining the corresponding macro. As for the deprecated features, these broken features will be only available until boost 1.55.
* [@http://svn.boost.org/trac/boost/ticket/6229 #6229] Rename the unique_future to future following the c++11.
* [@http://svn.boost.org/trac/boost/ticket/6266 #6266] Breaking change: thread destructor should call terminate if joinable.
* [@http://svn.boost.org/trac/boost/ticket/6269 #6269] Breaking change: thread move assignment should call terminate if joinable.
New Features:
* [@http://svn.boost.org/trac/boost/ticket/2361 #2361] thread_specific_ptr: document nature of the key, complexity and rationale.
* [@http://svn.boost.org/trac/boost/ticket/4710 #4710] C++11 compliance: Missing async().
* [@http://svn.boost.org/trac/boost/ticket/7283 #7283] C++11 compliance: Add notify_all_at_thread_exit.
* [@http://svn.boost.org/trac/boost/ticket/7345 #7345] C++11 compliance: Add noexcept to recursive mutex try_lock.
Fixed Bugs:
* [@http://svn.boost.org/trac/boost/ticket/2797 #2797] Two problems with thread_specific_ptr.
* [@http://svn.boost.org/trac/boost/ticket/5274 #5274] failed to compile future.hpp with stlport 5.1.5 under msvc8.1, because of undefined class.
* [@http://svn.boost.org/trac/boost/ticket/5431 #5431] compile error in Windows CE 6.0(interlocked).
[/* [@http://svn.boost.org/trac/boost/ticket/5752 #5752] boost::call_once() is unreliable on some platforms.]
* [@http://svn.boost.org/trac/boost/ticket/5696 #5696] win32 detail::set_tss_data does nothing when tss_cleanup_function is NULL.
* [@http://svn.boost.org/trac/boost/ticket/6931 #6931] mutex waits forwever with Intel C++ Compiler XE 12.1.5.344 Build 20120612
* [@http://svn.boost.org/trac/boost/ticket/7045 #7045] Thread library does not automatically compile date_time.
* [@http://svn.boost.org/trac/boost/ticket/7173 #7173] wrong function name interrupt_point().
* [@http://svn.boost.org/trac/boost/ticket/7200 #7200] Unable to build boost.thread modularized.
* [@http://svn.boost.org/trac/boost/ticket/7220 #7220] gcc 4.6.2 warns about inline+dllimport functions.
* [@http://svn.boost.org/trac/boost/ticket/7238 #7238] this_thread::sleep_for() does not respond to interrupt().
* [@http://svn.boost.org/trac/boost/ticket/7245 #7245] Minor typos on documentation related to version 3.
* [@http://svn.boost.org/trac/boost/ticket/7272 #7272] win32/thread_primitives.hpp: (Unneccessary) Warning.
* [@http://svn.boost.org/trac/boost/ticket/7284 #7284] Clarify that there is no access priority between lock and shared_lock on shared mutex.
* [@http://svn.boost.org/trac/boost/ticket/7329 #7329] boost/thread/future.hpp does not compile on HPUX.
* [@http://svn.boost.org/trac/boost/ticket/7336 #7336] BOOST_THREAD_DONT_USE_SYSTEM doesn't work.
* [@http://svn.boost.org/trac/boost/ticket/7329 #7349] packaged_task holds reference to temporary.
* [@http://svn.boost.org/trac/boost/ticket/7350 #7350] allocator_destructor does not destroy object
* [@http://svn.boost.org/trac/boost/ticket/7360 #7360] Memory leak in pthread implementation of boost::thread_specific_ptr
* [@http://svn.boost.org/trac/boost/ticket/7370 #7370] Boost.Thread documentation
* [@http://svn.boost.org/trac/boost/ticket/7438 #7438] Segmentation fault in test_once regression test in group.join_all();
* [@http://svn.boost.org/trac/boost/ticket/7461 #7461] detail::win32::ReleaseSemaphore may be called with count_to_release equal to 0
* [@http://svn.boost.org/trac/boost/ticket/7499 #7499] call_once doesn't call even once
[heading Version 3.0.1 - boost 1.51]
Deprecated Features:
Deprecated features since boost 1.50 available only until boost 1.55:
These deprecated features will be provided by default up to boost 1.52. If you don't want to include the deprecated features you could define BOOST_THREAD_DONT_PROVIDE_DEPRECATED_FEATURES_SINCE_V3_0_0. Since 1.53 these features will not be included any more by default. Since this version, if you want to include the deprecated features yet you could define BOOST_THREAD_PROVIDE_DEPRECATED_FEATURES_SINCE_V3_0_0. These deprecated features will be only available until boost 1.55, that is you have 1 year and a half to move to the new features.
* Time related functions don't using the Boost.Chrono library, use the chrono overloads instead.
Breaking changes when BOOST_THREAD_VERSION==3:
There are some new features which share the same interface but with different behavior. These breaking features are provided by default when BOOST_THREAD_VERSION is 3, but the user can however choose the version 2 behavior by defining the corresponding macro. As for the deprecated features, these broken features will be only available until boost 1.55.
* [@http://svn.boost.org/trac/boost/ticket/6229 #6229] Rename the unique_future to future following the c++11.
* [@http://svn.boost.org/trac/boost/ticket/6266 #6266] Breaking change: thread destructor should call terminate if joinable.
* [@http://svn.boost.org/trac/boost/ticket/6269 #6269] Breaking change: thread move assignment should call terminate if joinable.
Fixed Bugs:
* [@http://svn.boost.org/trac/boost/ticket/4258 #4258] Linking with boost thread does not work on mingw/gcc 4.5.
* [@http://svn.boost.org/trac/boost/ticket/4885 #4885] Access violation in set_tss_data at process exit due to invalid assumption about TlsAlloc.
* [@http://svn.boost.org/trac/boost/ticket/6931 #6931] mutex waits forwever with Intel Compiler and /debug:parallel
* [@http://svn.boost.org/trac/boost/ticket/7044 #7044] boost 1.50.0 header missing.
* [@http://svn.boost.org/trac/boost/ticket/7052 #7052] Thread: BOOST_THREAD_PROVIDES_DEPRECATED_FEATURES_SINCE_V3_0_0 only masks thread::operator==, thread::operator!= forward declarations, not definitions.
* [@http://svn.boost.org/trac/boost/ticket/7066 #7066] An attempt to fix current_thread_tls_key static initialization order.
* [@http://svn.boost.org/trac/boost/ticket/7074 #7074] Multiply defined symbol boost::allocator_arg.
* [@http://svn.boost.org/trac/boost/ticket/7078 #7078] Trivial 64-bit warning fix on Windows for thread attribute stack size
* [@http://svn.boost.org/trac/boost/ticket/7089 #7089] BOOST_THREAD_WAIT_BUG limits functionality without solving anything
[/
#6787 boost::thread::sleep() hangs if system time is rolled back
#7045 Thread library does not automatically compile date_time
]
[heading Version 3.0.0 - boost 1.50]
Breaking changes when BOOST_THREAD_VERSION==3:
* [@http://svn.boost.org/trac/boost/ticket/6229 #6229] Breaking change: Rename the unique_future to future following the c++11.
* [@http://svn.boost.org/trac/boost/ticket/6266 #6266] Breaking change: thread destructor should call terminate if joinable.
* [@http://svn.boost.org/trac/boost/ticket/6269 #6269] Breaking change: thread move assignment should call terminate if joinable.
New Features:
* [@http://svn.boost.org/trac/boost/ticket/1850 #1850] Request for unlock_guard to compliment lock_guard.
* [@http://svn.boost.org/trac/boost/ticket/2637 #2637] Request for shared_mutex duration timed_lock and timed_lock_shared.
* [@http://svn.boost.org/trac/boost/ticket/2741 #2741] Proposal to manage portable and non portable thread attributes.
* [@http://svn.boost.org/trac/boost/ticket/3567 #3567] Request for shared_lock_guard.
* [@http://svn.boost.org/trac/boost/ticket/6194 #6194] Adapt to Boost.Move.
* [@http://svn.boost.org/trac/boost/ticket/6195 #6195] c++11 compliance: Provide the standard time related interface using Boost.Chrono.
* [@http://svn.boost.org/trac/boost/ticket/6217 #6217] Enhance Boost.Thread shared mutex interface following Howard Hinnant proposal.
* [@http://svn.boost.org/trac/boost/ticket/6224 #6224] c++11 compliance: Add the use of standard noexcept on compilers supporting them.
* [@http://svn.boost.org/trac/boost/ticket/6225 #6225] Add the use of standard =delete defaulted operations on compilers supporting them.
* [@http://svn.boost.org/trac/boost/ticket/6226 #6226] c++11 compliance: Add explicit bool conversion from locks.
* [@http://svn.boost.org/trac/boost/ticket/6228 #6228] Add promise constructor with allocator following the standard c++11.
* [@http://svn.boost.org/trac/boost/ticket/6230 #6230] c++11 compliance: Follows the exception reporting mechanism as defined in the c++11.
* [@http://svn.boost.org/trac/boost/ticket/6231 #6231] Add BasicLockable requirements in the documentation to follow c++11.
* [@http://svn.boost.org/trac/boost/ticket/6272 #6272] c++11 compliance: Add thread::id hash specialization.
* [@http://svn.boost.org/trac/boost/ticket/6273 #6273] c++11 compliance: Add cv_status enum class and use it on the conditions wait functions.
* [@http://svn.boost.org/trac/boost/ticket/6342 #6342] c++11 compliance: Adapt the one_flag to the c++11 interface.
* [@http://svn.boost.org/trac/boost/ticket/6671 #6671] upgrade_lock: missing mutex and release functions.
* [@http://svn.boost.org/trac/boost/ticket/6672 #6672] upgrade_lock:: missing constructors from time related types.
* [@http://svn.boost.org/trac/boost/ticket/6675 #6675] upgrade_lock:: missing non-member swap.
* [@http://svn.boost.org/trac/boost/ticket/6676 #6676] lock conversion should be explicit.
* Added missing packaged_task::result_type and packaged_task:: constructor with allocator.
* Added packaged_task::reset()
Fixed Bugs:
* [@http://svn.boost.org/trac/boost/ticket/2380 #2380] boost::move from lvalue does not work with gcc.
* [@http://svn.boost.org/trac/boost/ticket/2430 #2430] shared_mutex for win32 doesn't have timed_lock_upgrade.
* [@http://svn.boost.org/trac/boost/ticket/2575 #2575] Bug- Boost 1.36.0 on Itanium platform.
* [@http://svn.boost.org/trac/boost/ticket/3160 #3160] Duplicate tutorial code in boost::thread.
* [@http://svn.boost.org/trac/boost/ticket/4345 #4345] thread::id and joining problem with cascade of threads.
* [@http://svn.boost.org/trac/boost/ticket/4521 #4521] Error using boost::move on packaged_task (MSVC 10).
* [@http://svn.boost.org/trac/boost/ticket/4711 #4711] Must use implementation details to return move-only types.
* [@http://svn.boost.org/trac/boost/ticket/4921 #4921] BOOST_THREAD_USE_DLL and BOOST_THREAD_USE_LIB are crucial and need to be documented.
* [@http://svn.boost.org/trac/boost/ticket/5013 #5013] documentation: boost::thread: pthreas_exit causes terminate().
* [@http://svn.boost.org/trac/boost/ticket/5173 #5173] boost::this_thread::get_id is very slow.
* [@http://svn.boost.org/trac/boost/ticket/5351 #5351] interrupt a future get boost::unknown_exception.
* [@http://svn.boost.org/trac/boost/ticket/5516 #5516] Upgrade lock is not acquired when previous upgrade lock releases if another read lock is present.
* [@http://svn.boost.org/trac/boost/ticket/5990 #5990] shared_future<T>::get() has wrong return type.
* [@http://svn.boost.org/trac/boost/ticket/6174 #6174] packaged_task doesn't correctly handle moving results.
* [@http://svn.boost.org/trac/boost/ticket/6222 #6222] Compile error with SunStudio: unique_future move.
* [@http://svn.boost.org/trac/boost/ticket/6354 #6354] PGI: Compiler threading support is not turned on.
* [@http://svn.boost.org/trac/boost/ticket/6673 #6673] shared_lock: move assign doesn't works with c++11.
* [@http://svn.boost.org/trac/boost/ticket/6674 #6674] shared_mutex: try_lock_upgrade_until doesn't works.
* [@http://svn.boost.org/trac/boost/ticket/6908 #6908] Compile error due to unprotected definitions of _WIN32_WINNT and WINVER.
* [@http://svn.boost.org/trac/boost/ticket/6940 #6940] TIME_UTC is a macro in C11.
* [@http://svn.boost.org/trac/boost/ticket/6959 #6959] call of abs is ambiguous.
* Fix issue signaled on the ML with task_object(task_object const&) in presence of task_object(task_object &&)
[heading Version 2.1.1 - boost 1.49]
Fixed Bugs:
* [@http://svn.boost.org/trac/boost/ticket/2309 #2309] Lack of g++ symbol visibility support in Boost.Thread.
* [@http://svn.boost.org/trac/boost/ticket/2639 #2639] documentation should be extended(defer_lock, try_to_lock, ...).
* [@http://svn.boost.org/trac/boost/ticket/3639 #3639] Boost.Thread doesn't build with Sun-5.9 on Linux.
* [@http://svn.boost.org/trac/boost/ticket/3762 #3762] Thread can't be compiled with winscw (Codewarrior by Nokia).
* [@http://svn.boost.org/trac/boost/ticket/3885 #3885] document about mix usage of boost.thread and native thread api.
* [@http://svn.boost.org/trac/boost/ticket/3975 #3975] Incorrect precondition for promise::set_wait_callback().
* [@http://svn.boost.org/trac/boost/ticket/4048 #4048] thread::id formatting involves locale
* [@http://svn.boost.org/trac/boost/ticket/4315 #4315] gcc 4.4 Warning: inline ... declared as dllimport: attribute ignored.
* [@http://svn.boost.org/trac/boost/ticket/4480 #4480] OpenVMS patches for compiler issues workarounds.
* [@http://svn.boost.org/trac/boost/ticket/4819 #4819] boost.thread's documentation misprints.
* [@http://svn.boost.org/trac/boost/ticket/5423 #5423] thread issues with C++0x.
* [@http://svn.boost.org/trac/boost/ticket/5617 #5617] boost::thread::id copy ctor.
* [@http://svn.boost.org/trac/boost/ticket/5739 #5739] set-but-not-used warnings with gcc-4.6.
* [@http://svn.boost.org/trac/boost/ticket/5826 #5826] threads.cpp: resource leak on threads creation failure.
* [@http://svn.boost.org/trac/boost/ticket/5839 #5839] thread.cpp: ThreadProxy leaks on exceptions.
* [@http://svn.boost.org/trac/boost/ticket/5859 #5859] win32 shared_mutex constructor leaks on exceptions.
* [@http://svn.boost.org/trac/boost/ticket/6100 #6100] Compute hardware_concurrency() using get_nprocs() on GLIBC systems.
* [@http://svn.boost.org/trac/boost/ticket/6168 #6168] recursive_mutex is using wrong config symbol (possible typo).
* [@http://svn.boost.org/trac/boost/ticket/6175 #6175] Compile error with SunStudio.
* [@http://svn.boost.org/trac/boost/ticket/6200 #6200] patch to have condition_variable and mutex error better handle EINTR.
* [@http://svn.boost.org/trac/boost/ticket/6207 #6207] shared_lock swap compiler error on clang 3.0 c++11.
* [@http://svn.boost.org/trac/boost/ticket/6208 #6208] try_lock_wrapper swap compiler error on clang 3.0 c++11.
[heading Version 2.1.0 - Changes since boost 1.40]
The 1.41.0 release of Boost adds futures to the thread library. There are also a few minor changes.
[heading Changes since boost 1.35]
The 1.36.0 release of Boost includes a few new features in the thread library:
* New generic __lock_multiple_ref__ and __try_lock_multiple_ref__ functions for locking multiple mutexes at once.
* Rvalue reference support for move semantics where the compilers supports it.
* A few bugs fixed and missing functions added (including the serious win32 condition variable bug).
* `scoped_try_lock` types are now backwards-compatible with Boost 1.34.0 and previous releases.
* Support for passing function arguments to the thread function by supplying additional arguments to the __thread__ constructor.
* Backwards-compatibility overloads added for `timed_lock` and `timed_wait` functions to allow use of `xtime` for timeouts.
[heading Version 2.0.0 - Changes since boost 1.34]
Almost every line of code in __boost_thread__ has been changed since the 1.34 release of boost. However, most of the interface
changes have been extensions, so the new code is largely backwards-compatible with the old code. The new features and breaking
changes are described below.
[heading New Features]
* Instances of __thread__ and of the various lock types are now movable.
* Threads can be interrupted at __interruption_points__.
* Condition variables can now be used with any type that implements the __lockable_concept__, through the use of
`boost::condition_variable_any` (`boost::condition` is a `typedef` to `boost::condition_variable_any`, provided for backwards
compatibility). `boost::condition_variable` is provided as an optimization, and will only work with
`boost::unique_lock<boost::mutex>` (`boost::mutex::scoped_lock`).
* Thread IDs are separated from __thread__, so a thread can obtain it's own ID (using `boost::this_thread::get_id()`), and IDs can
be used as keys in associative containers, as they have the full set of comparison operators.
* Timeouts are now implemented using the Boost DateTime library, through a typedef `boost::system_time` for absolute timeouts, and
with support for relative timeouts in many cases. `boost::xtime` is supported for backwards compatibility only.
* Locks are implemented as publicly accessible templates `boost::lock_guard`, `boost::unique_lock`, `boost::shared_lock`, and
`boost::upgrade_lock`, which are templated on the type of the mutex. The __lockable_concept__ has been extended to include publicly
available __lock_ref__ and __unlock_ref__ member functions, which are used by the lock types.
[heading Breaking Changes]
The list below should cover all changes to the public interface which break backwards compatibility.
* __try_mutex__ has been removed, and the functionality subsumed into __mutex__. __try_mutex__ is left as a `typedef`,
but is no longer a separate class.
* __recursive_try_mutex__ has been removed, and the functionality subsumed into
__recursive_mutex__. __recursive_try_mutex__ is left as a `typedef`, but is no longer a separate class.
* `boost::detail::thread::lock_ops` has been removed. Code that relies on the `lock_ops` implementation detail will no longer work,
as this has been removed, as it is no longer necessary now that mutex types now have public __lock_ref__ and __unlock_ref__ member
functions.
* `scoped_lock` constructors with a second parameter of type `bool` are no longer provided. With previous boost releases,
``boost::mutex::scoped_lock some_lock(some_mutex,false);`` could be used to create a lock object that was associated with a mutex,
but did not lock it on construction. This facility has now been replaced with the constructor that takes a
`boost::defer_lock_type` as the second parameter: ``boost::mutex::scoped_lock some_lock(some_mutex,boost::defer_lock);``
* The `locked()` member function of the `scoped_lock` types has been renamed to __owns_lock_ref__.
* You can no longer obtain a __thread__ instance representing the current thread: a default-constructed __thread__ object is not
associated with any thread. The only use for such a thread object was to support the comparison operators: this functionality has
been moved to __thread_id__.
* The broken `boost::read_write_mutex` has been replaced with __shared_mutex__.
* __mutex__ is now never recursive. For Boost releases prior to 1.35 __mutex__ was recursive on Windows and not on POSIX platforms.
* When using a __recursive_mutex__ with a call to [cond_any_wait_link `boost::condition_variable_any::wait()`], the mutex is only
unlocked one level, and not completely. This prior behaviour was not guaranteed and did not feature in the tests.
[endsect]
[section:future Future]
The following features will be included in next releases.
# Complete the C++11 missing features, in particular
* [@http://svn.boost.org/trac/boost/ticket/7413 #7413] c++11 compliance: Add async when the launch policy is deferred.
* [@http://svn.boost.org/trac/boost/ticket/7280 #7280] C++11 compliance: Add promise::...at_thread_exit functions.
* [@http://svn.boost.org/trac/boost/ticket/7282 #7282] C++11 compliance: Add packaged_task::make_ready_at_thread_exit function.
* [@http://svn.boost.org/trac/boost/ticket/7285 #7285] C++11 compliance: Allow to pass movable arguments for call_once.
* [@http://svn.boost.org/trac/boost/ticket/6227 #6227] C++11 compliance: Use of variadic templates on Generic Locking Algorithms on compilers providing them.
# Add some of the extension proposed in [@http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3428.pdf A Standardized Representation of Asynchronous Operations], in particular
* [@http://svn.boost.org/trac/boost/ticket/7445 #7445] Async: Add future<>.then
* [@http://svn.boost.org/trac/boost/ticket/7446 #7446] Async: Add when_any
* [@http://svn.boost.org/trac/boost/ticket/7447 #7447] Async: Add when_all
* [@http://svn.boost.org/trac/boost/ticket/7448 #7448] Async: Add async taking a scheduler parameter
# Add a synchronized value class following the design in [@http://www.drdobbs.com/cpp/enforcing-correct-mutex-usage-with-synch/225200269 Enforcing Correct Mutex Usage with Synchronized Values]
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