Blog Archive for / 2010 / 05 /

Enforcing Correct Mutex Usage with Synchronized Values

Friday, 28 May 2010

My latest article, Enforcing Correct Mutex Usage with Synchronized Values has been published on the Dr Dobb's website.

This article expands on the SynchronizedValue<T> template I mentioned in my presentation on Concurrency in the Real World at ACCU 2010, and deals with the problem of ensuring that the mutex associated with some data is locked whenever the data is accessed.

The basic idea is that you use SynchronizedValue<T> wherever you have an object of type T that you wish to be protected with its own mutex. The SynchronizedValue<T> then behaves like a pointer-to-T for simple uses.

Read the article for the full details.

Posted by Anthony Williams
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Tags: mutex, cplusplus
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just::thread C++0x Thread Library V1.4 (FCD Edition) Released

Thursday, 06 May 2010

I am pleased to announce that version 1.4 (the FCD edition) of just::thread, our C++0x Thread Library has just been released.

With the release of the "FCD edition", just::thread provides the first complete implementation of the multithreading facilities from the Final Committee Draft (FCD) of the C++0x standard.

Changes include:

• New promise::set_value_at_thread_exit, promise::set_exception_at_thread_exit, and packaged_task::make_ready_at_thread_exit member functions to defer unblocking waiting threads until the notifying thread exits
• New notify_all_at_thread_exit function for notifying condition variables when the notifying thread exits
• The wait_for and wait_until member functions of future, shared_future and atomic_future return a future_status enum rather than bool to indicate whether the future is ready, the wait timed out, or the future contains a deferred async function
• The destructor of the last future associated with an async function waits for that function to complete.
• New ATOMIC_VAR_INIT macro for initializing atomic objects
• The callable object for a packaged_task is destroyed with the packaged_task rather than being kept alive until the future is destroyed

As usual, existing customers are entitled to a free upgrade to V1.4.0 from all earlier versions.

Posted by Anthony Williams
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Tags: multithreading, concurrency, C++0x
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