# GSIOThreadPool class documentation

rfm@gnu.org
2010 Free Software Foundation, Inc.
Software documentation for the GSIOThreadPool class
GSIOThreadPool.h
This class provides a thread pool for performing methods which need to make use of a runloop for I/O and/or timers.
Operations are performed on these threads using the standard -performSelector:onThread:withObject:waitUntilDone: method... the pool is simply used to keep track of allocation of threads so that you can share jobs between them.
NB. The threading API in OSX 10.4 and earlier is incapable of supporting this functionality... in that case this class cannot be instantiated and initialised.
Description forthcoming.
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sharedPool
Returns an instance intended for sharing between sections of code which wish to make use of threading by performing operations in other threads, but which don't mind operations being interleaved with those belonging to other sections of code.
Always returns the same instance whenever the method is called.
The shared pool is created with an initial size as specified by the GSIOThreadPoolSize user default (zero if there is no such positive integer in the defauilts system, however, you can modify that using the -setThreads: method.
acquireThread
Selects a thread from the pool to be used for some job.
countForThread:
aThread
Returns the acquire count for the specified thread.
maxThreads
Returns the currently configured maximum number of threads in the pool.
setThreads:
max
Specify the maximum number of threads in the pool (the actual number used may be lower than this value).
Default is 0 (no thread pooling in use).
The pool creates threads on demand up to the specified limit (or a lower limit if dictated by system resources) but will not destroy idle threads unless the limit is subsequently lowered.
Setting a value of zero means that operations are performed in the main thread.
setTimeout:
t
Specifies the timeout allowed for a thread to close down when the pool is deallocated or has its size decreased. Any operations in progress in the thread need to close down within this period.
timeout
Returns the current timeout set for the pool.
unacquireThread:
aThread
Releases a thread previously selected from the pool.
GSIOThreadPool types

Description forthcoming.