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}
+There are two types of threads in wxWidgets: {\it detached} and {\it joinable}
ones, just as in the POSIX thread API (but unlike Win32 threads where all threads
are joinable). The difference between the two is that only joinable threads
-can return a return code - this is returned by the Wait() function. Detached
+can return a return code -- this is returned by the Wait() function. Detached
threads (the default type) cannot be waited for.
You shouldn't hurry to create all the threads joinable, however, because this
\latexignore{\rtfignore{\wxheading{Members}}}
+
\membersection{wxThread::wxThread}\label{wxthreadctor}
\func{}{wxThread}{\param{wxThreadKind }{kind = wxTHREAD\_DETACHED}}
This constructor creates a new detached (default) or joinable C++ thread object. It
-does not create or start execution of the real thread - for this you should
+does not create or start execution of the real thread -- for this you should
use the \helpref{Create}{wxthreadcreate} and \helpref{Run}{wxthreadrun} methods.
The possible values for {\it kind} parameters are:
\twocolitem{{\bf wxTHREAD\_JOINABLE}}{Create a joinable thread}
\end{twocollist}
+
\membersection{wxThread::\destruct{wxThread}}
\func{}{\destruct{wxThread}}{\void}
The destructor frees the resources associated with the thread. Notice that you
-should never delete a detached thread - you may only call
+should never delete a detached thread -- you may only call
\helpref{Delete}{wxthreaddelete} on it or wait until it terminates (and auto
destructs) itself. Because the detached threads delete themselves, they can
only be allocated on the heap.
will not delete the C++ thread object. It is also safe to allocate them on
stack.
+
\membersection{wxThread::Create}\label{wxthreadcreate}
-\func{wxThreadError}{Create}{\void}
+\func{wxThreadError}{Create}{\param{unsigned int }{stackSize = 0}}
Creates a new thread. The thread object is created in the suspended state, and you
-should call \helpref{Run}{wxthreadrun} to start running it.
+should call \helpref{Run}{wxthreadrun} to start running it. You may optionally
+specify the stack size to be allocated to it (Ignored on platforms that don't
+support setting it explicitly, eg. Unix).
\wxheading{Return value}
\twocolitem{{\bf wxTHREAD\_RUNNING}}{The thread is already running.}
\end{twocollist}
+
\membersection{wxThread::Delete}\label{wxthreaddelete}
\func{void}{Delete}{\void}
written, the thread will terminate after the next call to
\helpref{TestDestroy}{wxthreadtestdestroy} which should happen quite soon.
-However, if the thread doesn't call \helpref{TestDestroy}{wxthreadtestdestroy}
+However, if the thread doesn't call \helpref{TestDestroy}{wxthreadtestdestroy}
often enough (or at all), the function will not return immediately, but wait
until the thread terminates. As it may take a long time, and the message processing
is not stopped during this function execution, message handlers may be
called from inside it!
-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} failed for a detached thread to free the memory
-occupied by the thread object. This cleanup will be done in the destructor for joinable
-threads.
-
-Delete() may be called for a 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.
+Delete() may be called for a 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 in order 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.
This function can only be called from another thread context.
+
\membersection{wxThread::Entry}\label{wxthreadentry}
\func{virtual ExitCode}{Entry}{\void}
The returned value is the thread exit code which is only useful for
joinable threads and is the value returned by \helpref{Wait}{wxthreadwait}.
-This function is called by wxWindows itself and should never be called
+This function is called by wxWidgets itself and should never be called
directly.
+
\membersection{wxThread::Exit}\label{wxthreadexit}
\func{void}{Exit}{\param{ExitCode }{exitcode = 0}}
thread, i.e. a thread can only exit from itself, not from another thread.
This function will terminate the OS thread (i.e. stop the associated path of
-execution) and also delete the associated C++ object for detached threads.
+execution) and also delete the associated C++ object for detached threads.
\helpref{wxThread::OnExit}{wxthreadonexit} will be called just before exiting.
+
\membersection{wxThread::GetCPUCount}\label{wxthreadgetcpucount}
\func{static int}{GetCPUCount}{\void}
\helpref{SetConcurrency}{wxthreadsetconcurrency}
+
+\membersection{wxThread::GetCurrentId}\label{wxthreadgetcurrentid}
+
+\func{static unsigned long}{GetCurrentId}{\void}
+
+Returns the platform specific thread ID of the current thread as a
+long. This can be used to uniquely identify threads, even if they are
+not wxThreads.
+
+
\membersection{wxThread::GetId}\label{wxthreadgetid}
\constfunc{unsigned long}{GetId}{\void}
Gets the thread identifier: this is a platform dependent number that uniquely identifies the
thread throughout the system during its existence (i.e. the thread identifiers may be reused).
+
\membersection{wxThread::GetPriority}\label{wxthreadgetpriority}
\constfunc{int}{GetPriority}{\void}
\twocolitem{{\bf WXTHREAD\_MAX\_PRIORITY}}{100}
\end{twocollist}
+
\membersection{wxThread::IsAlive}\label{wxthreadisalive}
\constfunc{bool}{IsAlive}{\void}
-Returns TRUE if the thread is alive (i.e. started and not terminating).
+Returns \true if the thread is alive (i.e. started and not terminating).
+
+Note that this function can only be saely used with joinable threads, not
+detached ones as the latter delete themselves and so when the real thread is
+not alive any longer it is not possible to call this function neither because
+the wxThread object doesn't exist any more as well.
+
\membersection{wxThread::IsDetached}\label{wxthreadisdetached}
\constfunc{bool}{IsDetached}{\void}
-Returns TRUE if the thread is of the detached kind, FALSE if it is a joinable one.
+Returns \true if the thread is of the detached kind, \false if it is a joinable
+one.
+
\membersection{wxThread::IsMain}\label{wxthreadismain}
\func{static bool}{IsMain}{\void}
-Returns TRUE if the calling thread is the main application thread.
+Returns \true if the calling thread is the main application thread.
+
\membersection{wxThread::IsPaused}\label{wxthreadispaused}
\constfunc{bool}{IsPaused}{\void}
-Returns TRUE if the thread is paused.
+Returns \true if the thread is paused.
+
\membersection{wxThread::IsRunning}\label{wxthreadisrunning}
\constfunc{bool}{IsRunning}{\void}
-Returns TRUE if the thread is running.
+Returns \true if the thread is running.
+
+This method may only be safely used for joinable threads, see the remark in
+\helpref{IsAlive}{wxthreadisalive}.
+
\membersection{wxThread::Kill}\label{wxthreadkill}
cannot kill itself.
It is also an error to call this function for a thread which is not running or
-paused (in the latter case, the thread will be resumed first) - if you do it,
+paused (in the latter case, the thread will be resumed first) -- if you do it,
a {\tt wxTHREAD\_NOT\_RUNNING} error will be returned.
+
\membersection{wxThread::OnExit}\label{wxthreadonexit}
\func{void}{OnExit}{\void}
Called when the thread exits. This function is called in the context of the
thread associated with the wxThread object, not in the context of the main
-thread. This function will not be called if the thread was
+thread. This function will not be called if the thread was
\helpref{killed}{wxthreadkill}.
This function should never be called directly.
+
\membersection{wxThread::Pause}\label{wxthreadpause}
\func{wxThreadError}{Pause}{\void}
Suspends the thread. Under some implementations (Win32), the thread is
-suspended immediately, under others it will only be suspended when it calls
+suspended immediately, under others it will only be suspended when it calls
\helpref{TestDestroy}{wxthreadtestdestroy} for the next time (hence, if the
thread doesn't call it at all, it won't be suspended).
This function can only be called from another thread context.
+
\membersection{wxThread::Run}\label{wxthreadrun}
\func{wxThreadError}{Run}{\void}
-Starts the thread execution. Should be called after
+Starts the thread execution. Should be called after
\helpref{Create}{wxthreadcreate}.
This function can only be called from another thread context.
+
\membersection{wxThread::SetPriority}\label{wxthreadsetpriority}
\func{void}{SetPriority}{\param{int}{ priority}}
-Sets the priority of the thread, between zero and 100. This must be set before the thread is created.
+Sets the priority of the thread, between $0$ and $100$. It can only be set
+after calling \helpref{Create()}{wxthreadcreate} but before calling
+\helpref{Run()}{wxthreadrun}.
The following priorities are already defined:
\twocolitem{{\bf WXTHREAD\_MAX\_PRIORITY}}{100}
\end{twocollist}
+
\membersection{wxThread::Sleep}\label{wxthreadsleep}
\func{static void}{Sleep}{\param{unsigned long }{milliseconds}}
This function should be used instead of \helpref{wxSleep}{wxsleep} by all worker
threads (i.e. all except the main one).
+
\membersection{wxThread::Resume}\label{wxthreadresume}
\func{wxThreadError}{Resume}{\void}
This function can only be called from another thread context.
+
\membersection{wxThread::SetConcurrency}\label{wxthreadsetconcurrency}
\func{static bool}{SetConcurrency}{\param{size\_t }{level}}
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).
+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}
+\func{virtual bool}{TestDestroy}{\void}
This function should be called periodically by the thread to ensure that calls
to \helpref{Pause}{wxthreadpause} and \helpref{Delete}{wxthreaddelete} will
-work. If it returns TRUE, the thread should exit as soon as possible.
+work. If it returns \true, the thread should exit as soon as possible.
+
+Notice that under some platforms (POSIX), implementation of
+\helpref{Pause}{wxthreadpause} also relies on this function being called, so
+not calling it would prevent both stopping and suspending thread from working.
+
\membersection{wxThread::This}\label{wxthreadthis}
not created with wxThread class. Generally speaking, the return value for such a thread
is undefined.
+
\membersection{wxThread::Yield}\label{wxthreadyield}
\func{void}{Yield}{\void}
Give the rest of the thread time slice to the system allowing the other threads to run.
See also \helpref{Sleep()}{wxthreadsleep}.
+
\membersection{wxThread::Wait}\label{wxthreadwait}
\constfunc{ExitCode}{Wait}{\void}
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