change configure to better detect gstreamer. Check create is valid in mediaplayer...

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

diff --git a/docs/latex/wx/conditn.tex b/docs/latex/wx/conditn.tex
index 426e551d7d45b188ad6f4799c632d1f2139511ff..2549e477f6c4945b1373dab5a0b9af06335ad006 100644 (file)
--- a/docs/latex/wx/conditn.tex
+++ b/docs/latex/wx/conditn.tex
@@ -13,8 +13,12 @@ worker threads it already makes much more sense).
 
 Note that a call to \helpref{Signal()}{wxconditionsignal} may happen before the
 other thread calls \helpref{Wait()}{wxconditionwait} and, just as with the
-pthread conditions, the signal is then lost and so if you want to be sure to
-get it you must use a mutex together with the condition variable.
+pthread conditions, the signal is then lost and so if you want to be sure that
+you don't miss it you must keep the mutex associated with the condition
+initially locked and lock it again before calling 
+\helpref{Signal()}{wxconditionsignal}. Of course, this means that this call is
+going to block until \helpref{Wait()}{wxconditionwait} is called by another
+thread.
 
 \wxheading{Example}
 
@@ -79,6 +83,20 @@ call \helpref{wxThread::Wait}{wxthreadwait} on it, but this example does
 illustrate the importance of properly locking the mutex when using
 wxCondition.
 
+\wxheading{Constants}
+
+The following return codes are returned by wxCondition member functions:
+
+\begin{verbatim}
+enum wxCondError
+{
+    wxCOND_NO_ERROR = 0,    // successful completion
+    wxCOND_INVALID,         // object hasn't been initialized successfully
+    wxCOND_TIMEOUT,         // WaitTimeout() has timed out
+    wxCOND_MISC_ERROR       // some other error
+};
+\end{verbatim}
+
 \wxheading{Derived from}
 
 None.
@@ -93,14 +111,17 @@ None.
 
 \latexignore{\rtfignore{\wxheading{Members}}}
 
-\membersection{wxCondition::wxCondition}\label{wxconditionconstr}
+\membersection{wxCondition::wxCondition}\label{wxconditionctor}
 
 \func{}{wxCondition}{\param{wxMutex\& }{mutex}}
 
 Default and only constructor. The {\it mutex} must be locked by the caller
 before calling \helpref{Wait}{wxconditionwait} function.
 
-\membersection{wxCondition::\destruct{wxCondition}}
+Use \helpref{IsOk}{wxconditionisok} to check if the object was successfully
+initialized.
+
+\membersection{wxCondition::\destruct{wxCondition}}\label{wxconditiondtor}
 
 \func{}{\destruct{wxCondition}}{\void}
 
@@ -119,6 +140,13 @@ not.
 
 \helpref{wxCondition::Signal}{wxconditionsignal}
 
+\membersection{wxCondition::IsOk}\label{wxconditionisok}
+
+\constfunc{bool}{IsOk}{\void}
+
+Returns {\tt true} if the object had been initialized successfully, {\tt false} 
+if an error occured.
+
 \membersection{wxCondition::Signal}\label{wxconditionsignal}
 
 \func{void}{Signal}{\void}
@@ -137,26 +165,46 @@ condition is locked or not.
 
 \membersection{wxCondition::Wait}\label{wxconditionwait}
 
-\func{void}{Wait}{\void}
+\func{wxCondError}{Wait}{\void}
 
 Waits until the condition is signalled.
 
-\func{bool}{Wait}{\param{unsigned long}{ sec}, \param{unsigned long}{ nsec}}
+This method atomically releases the lock on the mutex associated with this
+condition (this is why it must be locked prior to calling Wait) and puts the
+thread to sleep until \helpref{Signal}{wxconditionsignal} or 
+\helpref{Broadcast}{wxconditionbroadcast} is called.
+
+Note that even if \helpref{Signal}{wxconditionsignal} had been called before
+Wait without waking up any thread, the thread would still wait for another one
+and so it is important to ensure that the condition will be signalled after
+Wait or the thread may sleep forever.
+
+\wxheading{Return value}
+
+Returns {\tt wxCOND\_NO\_ERROR} on success, another value if an error occured.
+
+\wxheading{See also}
+
+\helpref{WaitTimeout}{wxconditionwaittimeout}
+
+
+\membersection{wxCondition::WaitTimeout}\label{wxconditionwaittimeout}
+
+\func{wxCondError}{Wait}{\param{unsigned long}{ milliseconds}}
 
 Waits until the condition is signalled or the timeout has elapsed.
 
-Note that the mutex associated with this condition {\bf must} be acquired by
-the thread before calling this method.
+This method is identical to \helpref{Wait}{wxconditionwait} except that it
+returns, with the return code of {\tt wxCOND\_TIMEOUT} as soon as the given
+timeout expires.
 
 \wxheading{Parameters}
 
-\docparam{sec}{Timeout in seconds}
-
-\docparam{nsec}{Timeout nanoseconds component (added to {\it sec}).}
+\docparam{milliseconds}{Timeout in milliseconds}
 
 \wxheading{Return value}
 
-The second form returns {\tt true} if the condition has been signalled, or
-{\tt false} if it returned because the timeout has elapsed.
-
+Returns {\tt wxCOND\_NO\_ERROR} if the condition was signalled, 
+{\tt wxCOND\_TIMEOUT} if the timeout elapsed before this happened or another
+error code from wxCondError enum.