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GUY (1 Reply)
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--------------------------------------------------------------------------------
Hi,
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multithreading_support(3) Coin multithreading_support(3)
NAME
multithreading_support - Multithreading Support in Coin The support in Coin for using multiple threads in application programs and the Coin
library itself, consists of two main features:
o Coin provides platform-independent thread-handling abstraction classes. These are classes that the application programmer can freely use
in her application code to start new threads, control their execution, work with mutexes and do other tasks related to handling multiple
threads.
The classes in question are SbThread, SbMutex, SbStorage, SbBarrier, SbCondVar, SbFifo, SbThreadAutoLock, SbRWMutex, and SbTypedStorage.
See their respective documentation for the detailed information.
The classes fully hides the system-specific implementation, which is either done on top of native Win32 (if on Microsoft Windows), or over
POSIX threads (on UNIX and UNIX-like systems).
o The other aspect of our multi-threading support is that Coin can be specially configured so that rendering traversals of the scene graph
are done in a thread-safe manner. This means e.g. that it is possible to have Coin render the scene in parallel on multiple CPUs for
multiple rendering pipes, to better take advantage of such high-end systems (like CAVE environments, for instance).
Thread-safe render traversals are off by default, because there is a small overhead involved which would make rendering (very) slightly
slower on single-threaded invocations.
To get a Coin library built with thread-safe rendering, one must actively re-configure Coin and build a special, local version. For
configure-based builds (UNIX and UNIX-like systems, or with Cygwin on Microsoft Windows) this is done with the option '--enable-threadsafe'
to Autoconf configure. For how to change the configuration and re-build with Visual Studio, get in touch with us at 'coin-
support@coin3d.org'.
There are some restrictions and other issues which it is important to be aware of:
o We do not yet provide any support for binding the multi-threaded rendering support into the SoQt / SoWin / etc GUI bindings, and neither
do we provide bindings against any specific library that handles multi-pipe rendering. This means the application programmer will have to
possess some expertise, and put in some effort, to be able to utilize multi-pipe rendering with Coin.
o Rendering traversals is currently the only operation which we publicly support to be thread-safe. There are other aspects of Coin that we
know are thread-safe, like most other action traversals beside just rendering, but we make no guarantees in this regard.
o Be careful about using a separate thread for changing Coin structures versus what is used for the application's GUI event thread.
We are aware of at least issues with Qt (and thereby SoQt), where you should not modify the scene graph in any way in a thread separate
from the main Qt thread. This because it will trigger operations where Qt is not thread-safe.
Since:
Coin 2.0
Version 3.1.3 Wed May 23 2012 multithreading_support(3)