Some other typos

[wxWidgets.git] / docs / latex / wx / thread.tex

diff --git a/docs/latex/wx/thread.tex b/docs/latex/wx/thread.tex
index b487d8178bbf19380a624352631c3a5fcc73c99c..001281e5fdbb3cf07c716f1694d207df40fd3e62 100644 (file)
--- a/docs/latex/wx/thread.tex
+++ b/docs/latex/wx/thread.tex
@@ -8,6 +8,25 @@ much easier to share common data between several threads, it also makes much
 easier to shoot oneself in the foot, so careful use of synchronization objects
 such as \helpref{mutexes}{wxmutex} and/or \helpref{critical sections}{wxcriticalsection} is recommended.
 
 easier to shoot oneself in the foot, so careful use of synchronization objects
 such as \helpref{mutexes}{wxmutex} and/or \helpref{critical sections}{wxcriticalsection} is recommended.
 

+There are two types of threads in wxWindows: {\it detached} and {\it joinable}
+ones, just as in POSIX thread API (but unlike Win32 threads where all threads
+are joinable). The difference between the two is that only joinbale threads
+can return a return code - it is returned by Wait() function. The detached
+threads (default) can not be waited for.
+
+You shouldn't hurry to create all the threads joinable, however, because this
+has a disadvantage as well: you {\bf must} Wait() for a joinable thread of the
+system resources used by it will never be freed and you also must delete the
+corresponding wxThread object yourself, while detached threads are of the
+"fire-and-forget" kind: you only have to start a detached thread and it will
+terminate and destroy itself.
+
+This means, of course, that all detached threads {\bf must} be created on the
+heap because the thread will call {\tt delete this;} upon termination. The
+joinable threads may be created on stack (don't create global thread objects
+because they allocate memory in their constructor which is a badthing to do),
+although usually they will be created on the heap as well.
+

 \wxheading{Derived from}
 
 None.
 \wxheading{Derived from}
 
 None.


@@ -84,6 +103,12 @@ created. Moreover, it must be called if \helpref{Create}{wxthreadcreate} or
 occupied by the thread object (it will be done in the destructor for joinable
 threads).
 
 occupied by the thread object (it will be done in the destructor for joinable
 threads).
 

+Delete() may be called for thread in any state: running, paused or even not yet created. Moreover,
+it must be called if \helpref{Create}{wxthreadcreate} or \helpref{Run}{wxthreadrun} fail to free
+the memory occupied by the thread object. However, you should not call Delete()
+on a detached thread which already terminated - doing so will probably result
+in a crash because the thread object doesn't exist any more.
+

 For detached threads Delete() will also delete the C++ thread object, but it
 will not do this for joinable ones.
 
 For detached threads Delete() will also delete the C++ thread object, but it
 will not do this for joinable ones.
 


@@ -102,6 +127,16 @@ joinable threads and is the value returned by \helpref{Wait}{wxthreadwait}.
 This function is called by wxWindows itself and should never be called
 directly.
 
 This function is called by wxWindows itself and should never be called
 directly.
 

+\membersection{wxThread::GetCPUCount}\label{wxthreadgetcpucount}
+
+\func{static int}{GetCPUCount}{\void}
+
+Returns the number of system CPUs or -1 if the value is unknown.
+
+\wxheading{See also}
+
+\helpref{SetConcurrency}{wxthreadsetconcurrency}
+

 \membersection{wxThread::GetId}\label{wxthreadgetid}
 
 \constfunc{unsigned long}{GetId}{\void}
 \membersection{wxThread::GetId}\label{wxthreadgetid}
 
 \constfunc{unsigned long}{GetId}{\void}


@@ -228,6 +263,17 @@ Resumes a thread suspended by the call to \helpref{Pause}{wxthreadpause}.
 
 This function can only be called from another thread context.
 
 
 This function can only be called from another thread context.
 

+\membersection{wxThread::SetConcurrency}\label{wxthreadsetconcurrency}
+
+\func{static bool}{SetConcurrency}{\param{size\_t }{level}}
+
+Sets the thread concurrency level for this process. This is, roughly, the
+number of threads that the system tries to schedule to run in parallel.
+The value of $0$ for {\it level} may be used to set the default one.
+
+Returns TRUE on success or FALSE otherwise (for example, if this function is
+not implemented for this platform (currently everything except Solaris)).
+

 \membersection{wxThread::TestDestroy}\label{wxthreadtestdestroy}
 
 \func{bool}{TestDestroy}{\void}
 \membersection{wxThread::TestDestroy}\label{wxthreadtestdestroy}
 
 \func{bool}{TestDestroy}{\void}


@@ -263,3 +309,4 @@ Waits until the thread terminates and returns its exit code or {\tt
 You can only Wait() for joinable (not detached) threads.
 
 This function can only be called from another thread context.
 You can only Wait() for joinable (not detached) threads.
 
 This function can only be called from another thread context.

+