88 lines
3 KiB
Racket
88 lines
3 KiB
Racket
#lang scribble/manual
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@(require (for-label racket))
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@title{Process}
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@section{categories}
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Core>Kernel
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Runtime environment for the virtual machine and interpreter.
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@section{description}
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A Process is the runtime environment for the virtual machine and interpreter.
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It has a subclass named link::Classes/Main:: which is where you should override the methods
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of Process. There are two methods of interest. One is named
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@racketblock[startup:: and is
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called after the class library has been compiled. The other is named ]
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@racketblock[run:: and
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is called when the user chooses the Run menu command.
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]
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@section{classMethods}
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@section{method}
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tailCallOptimize
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Get or set tail call optimization. The default is on. Setting this to
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@racketblock[false:: can help with debugging by including intermediate levels in an error backtrace.
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]
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@section{instanceMethods}
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@section{method}
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nowExecutingPath
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Usage:
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@racketblock[thisProcess.nowExecutingPath::
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Returns the full path to the file containing the code that is currently executing emphasis::interactively:: in the interpreter. Usually this is the current document. If the code block executes another file on disk, using link::Classes/String#-load:: or link::Classes/String#-loadPaths::, teletype::nowExecutingPath:: will be the location of the the executed file.
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teletype::nowExecutingPath:: is valid only for interactive code, i.e., code files with a teletype::.scd:: extension. It does not apply to class definitions (teletype::.sc::). For that, use ]
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@racketblock[thisMethod.filenameSymbol:: or ]
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@racketblock[this.class.filenameSymbol::.
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This method is supported in the SuperCollider IDE, the macOS-only SuperCollider.app, and the scel (SuperCollider-Emacs-Lisp) environment. In other editor environments, it will return ]
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@racketblock[nil::.
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]
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@section{WARNING}
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teletype::nowExecutingPath:: has a corresponding setter method, teletype::nowExecutingPath_::, for internal use only by the interpreter. Do not call the setter method!::
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@section{method}
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startup
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called after the class library has been compiled. Override this in class link::Classes/Main:: to do whatever you want.
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@section{method}
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run
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called when the user chooses the Run menu command. Override this in class link::Classes/Main:: to do whatever you want.
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@section{method}
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mainThread
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The top-level link::Classes/Thread::, i.e the link::Classes/Thread#-parent#parent:: of all
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other Threads. This instance of Thread always exists and is created with the Process when
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SuperCollider starts.
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@section{discussion}
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All SuperCollider code initially runs in the context of the main Thread:
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@section{list}
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## Code evaluated in code editor
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## Code evaluated on command line
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## Tasks scheduled on any link::Classes/Clock::
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## Functions evaluated in response to incoming OSC and MIDI messages
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::
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This means that link::Classes/Thread#.thisThread#thisThread:: will always initially point
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to the main Thread. However, when some code starts a link::Classes/Routine::, the Routine
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becomes the current Thread, with the main Thread as its parent.
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