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author | Fred Drake <fdrake@acm.org> | 2002-03-19 14:37:44 (GMT) |
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committer | Fred Drake <fdrake@acm.org> | 2002-03-19 14:37:44 (GMT) |
commit | 1268678395ebad3d939b390c2de30974bf802ad9 (patch) | |
tree | cfcadbc295f2f9ea748e5e7bd7e96523475ac3ef /Doc/lib/libthreading.tex | |
parent | 2f31d561d5039dbe008c0a3d57f85d8a90423a63 (diff) | |
download | cpython-1268678395ebad3d939b390c2de30974bf802ad9.zip cpython-1268678395ebad3d939b390c2de30974bf802ad9.tar.gz cpython-1268678395ebad3d939b390c2de30974bf802ad9.tar.bz2 |
Adjust some poor wording in the text that explains what events are used
for (reported by Keith Briggs).
Wrap some very long lines.
Diffstat (limited to 'Doc/lib/libthreading.tex')
-rw-r--r-- | Doc/lib/libthreading.tex | 56 |
1 files changed, 29 insertions, 27 deletions
diff --git a/Doc/lib/libthreading.tex b/Doc/lib/libthreading.tex index cd77246..a152a4d 100644 --- a/Doc/lib/libthreading.tex +++ b/Doc/lib/libthreading.tex @@ -40,10 +40,10 @@ threads and threads that have not yet been started. \end{funcdesc} \begin{funcdesc}{Event}{} -A factory function that returns a new event object. An event -manages a flag that can be set to true with the \method{set()} method and -reset to false with the \method{clear()} method. The \method{wait()} method blocks -until the flag is true. +A factory function that returns a new event object. An event manages +a flag that can be set to true with the \method{set()} method and +reset to false with the \method{clear()} method. The \method{wait()} +method blocks until the flag is true. \end{funcdesc} \begin{funcdesc}{Lock}{} @@ -79,7 +79,8 @@ semaphore is released too many times it's a sign of a bug. If not given, \end{funcdesc} \begin{classdesc*}{Thread}{} -A class that represents a thread of control. This class can be safely subclassed in a limited fashion. +A class that represents a thread of control. This class can be safely +subclassed in a limited fashion. \end{classdesc*} \begin{classdesc*}{Timer}{} @@ -409,15 +410,15 @@ The use of a bounded semaphore reduces the chance that a programming error which causes the semaphore to be released more than it's acquired will go undetected. + \subsection{Event Objects \label{event-objects}} This is one of the simplest mechanisms for communication between -threads: one thread signals an event and one or more other threads -are waiting for it. +threads: one thread signals an event and other threads wait for it. An event object manages an internal flag that can be set to true with -the \method{set()} method and reset to false with the \method{clear()} method. The -\method{wait()} method blocks until the flag is true. +the \method{set()} method and reset to false with the \method{clear()} +method. The \method{wait()} method blocks until the flag is true. \begin{classdesc}{Event}{} @@ -437,8 +438,8 @@ at all. \begin{methoddesc}{clear}{} Reset the internal flag to false. -Subsequently, threads calling \method{wait()} will block until \method{set()} is -called to set the internal flag to true again. +Subsequently, threads calling \method{wait()} will block until +\method{set()} is called to set the internal flag to true again. \end{methoddesc} \begin{methoddesc}{wait}{\optional{timeout}} @@ -542,10 +543,10 @@ separate thread of control. Method representing the thread's activity. You may override this method in a subclass. The standard -\method{run()} method invokes the callable object passed to the object's constructor as the -\var{target} argument, if any, with sequential and keyword -arguments taken from the \var{args} and \var{kwargs} arguments, -respectively. +\method{run()} method invokes the callable object passed to the +object's constructor as the \var{target} argument, if any, with +sequential and keyword arguments taken from the \var{args} and +\var{kwargs} arguments, respectively. \end{methoddesc} \begin{methoddesc}{join}{\optional{timeout}} @@ -554,8 +555,8 @@ This blocks the calling thread until the thread whose \method{join()} method is called terminates -- either normally or through an unhandled exception -- or until the optional timeout occurs. -When the \var{timeout} argument is present and not \code{None}, it should -be a floating point number specifying a timeout for the +When the \var{timeout} argument is present and not \code{None}, it +should be a floating point number specifying a timeout for the operation in seconds (or fractions thereof). A thread can be \method{join()}ed many times. @@ -603,15 +604,16 @@ threads are left. \subsection{Timer Objects \label{timer-objects}} -This class represents an action that should be run only after a certain amount -of time has passed --- a timer. \class{Timer} is a subclass of \class{Thread} and -as such also functions as an example of creating custom threads. +This class represents an action that should be run only after a +certain amount of time has passed --- a timer. \class{Timer} is a +subclass of \class{Thread} and as such also functions as an example of +creating custom threads. -Timers are started, as with threads, by calling their \method{start()} method. The -timer can be stopped (before its action has begun) by calling the -\method{cancel()} method. The interval the timer will wait before executing -its action may not be exactly the same as the interval specified by the -user. +Timers are started, as with threads, by calling their \method{start()} +method. The timer can be stopped (before its action has begun) by +calling the \method{cancel()} method. The interval the timer will +wait before executing its action may not be exactly the same as the +interval specified by the user. For example: \begin{verbatim} @@ -628,6 +630,6 @@ keyword arguments \var{kwargs}, after \var{interval} seconds have passed. \end{classdesc} \begin{methoddesc}{cancel}{} -Stop the timer, and cancel the execution of the timer's action. This will only -work if the timer is still in its waiting stage. +Stop the timer, and cancel the execution of the timer's action. This +will only work if the timer is still in its waiting stage. \end{methoddesc} |