关于Matlab中用timer来实现多线程机制

浏览数：28 / 时间：2015年06月08日

Timer 计时器

MATLAB的计时器主要用于完成动画任务及定时任务。

Construct timer object 构造一个计时器对象

Syntax

T = timer
T = timer(‘PropertyName1‘, PropertyValue1, ‘PropertyName2‘, PropertyValue2,...)

Discription

T = timer constructs a timer object with default attributes.

利用默认属性构造一个计时器对象

T = timer(‘PropertyName1‘, PropertyValue1, ‘PropertyName2‘, PropertyValue2,...) constructs atimer object in which the given property name/value pairs are set on the object.

利用给定的属性名称/属性值对来构造一个计时器对象

See Timer Object Properties for a list of all the properties supported by the timer object.

可以通过计时器属性列表来了解所有计时器对象支持的属性

Note that the property name/property value pairs can be in any format supported by the setfunction, i.e., property/value string pairs, structures, and property/value cell array pairs.

注意属性名称/属性值对儿可以利用任何的set函数支持的形式设置，例如属性名称/属性值字符串对，结构体和属性名称/属性值原包数组对儿。

Examples

下面是无开始延迟，周期为1s，执行任务无限个，执行模式为固定延时模式，回调函数为显示“hello world”字符串的计时器设置。Cmd模式直接输入即可：

T=time(‘StartDelay‘,0,‘Period‘,1,‘TasksToExecute‘,inf,‘ExecutionMode‘,‘fixedDelay‘,‘TimerFcn‘,‘disp(‘‘Hello World!‘‘)‘);

初始化完成后,调用

start(t);

在CMD Window中显示(每秒输出一行)：

Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!
Hello World!

调用stop(t),则计时器停止。

Timer Object Properties

The timer object supports the following properties that control its attributes. The table includes information about the data type of each property and its default value.

To view the value of the properties of a particular timer object, use the get(timer) function. To set the value of the properties of a timer object, use the set(timer) function.

Property Name	Property Description	Data Types, Values, Defaults, Access
`AveragePeriod`	Average time between `TimerFcn`executions since the timer started. Note: Value is `NaN` until timerexecutes two timer callbacks. 计时器开始后的TimerFcn平均执行时间	Data type	`double`
		Default	`NaN`
		Read only	Always
`BusyMode`	Action taken when a timer has to execute `TimerFcn` before the completion of previous execution of`TimerFcn`. 当计时器执行TimerFcn时前面的执行未完成时采取的措施 `‘drop‘` — Do not execute the function. `‘error‘` — Generate an error. Requires `ErrorFcn` to be set. `‘queue‘` — Execute function at next opportunity.	Data type	Enumerated string
		Values	`‘drop‘` `‘error‘` `‘queue‘`
		Default	`‘drop‘`
		Read only	While `Running` = `‘on‘`
`ErrorFcn`	Function that the timer executes when an error occurs. This function executes before the `StopFcn`. SeeCreating Callback Functions for more information.	Data type	Text string, function handle, or cell array
		Default	None
		Read only	Never
`ExecutionMode`	Determines how the timer object schedules timer events. SeeTimer Object Execution Modes for more information. 决定计时器对象的计时事件的方式。	Data type	Enumerated string
		Values	`‘singleShot‘` `‘fixedDelay‘` `‘fixedRate‘` `‘fixedSpacing‘`
		Default	`‘singleShot‘`
		Read only	While `Running = ‘on‘`
`InstantPeriod`	The time between the last two executions of `TimerFcn`. 最后两次执行时间间隔	Data type	`double`
		Default	`NaN`
		Read only	Always
`Name`	User-supplied name. 用户提供的名称	Data type	Text string
		Default	`‘timer-``i``‘`, where `i` is a number indicating the `i`thtimer object created this session. To reset `i` to 1, execute the `clear classes`command.
		Read only	Never
`ObjectVisibility`	Provides a way for application developers to prevent end-user access to the timer objects created by their application. The`timerfind` function does not return an object whose `ObjectVisibility`property is set to `‘off‘`. Objects that are not visible are still valid. If you have access to the object (for example, from within the M-file that created it), you can set its properties.	Data type	Enumerated string
		Values	`‘off‘` `‘on‘`
		Default	`‘on‘`
		Read only	Never
`Period`	Specifies the delay, in seconds, between executions of `TimerFcn`. 指定两次执行回调的延迟，以秒为单位	Data type	`double`
		Value	Any number >= 0.001
		Default	1.0
		Read only	While `Running` = `‘on‘`
`Running`	Indicates whether the timer is currently executing. 标志计时器是否在工作	Data type	Enumerated string
		Values	`‘off‘` `‘on‘`
		Default	`‘off‘`
		Read only	Always
`StartDelay`	Specifies the delay, in seconds, between the start of the timer and the first execution of the function specified in `TimerFcn`.	Data type	`double`
		Values	Any number >= 0
		Default	0
		Read only	While `Running` =`‘on‘`
`StartFcn`	Function the timer calls when it starts. See Creating Callback Functions for more information.	Data type	Text string, function handle, or cell array
		Default	None
		Read only	Never
`StopFcn`	Function the timer calls when it stops. The timer stops when You call the timer `stop` function The timer finishes executing`TimerFcn`, i.e., the value of`TasksExecuted` reaches the limit set by `TasksToExecute`. An error occurs (The `ErrorFcn` is called first, followed by the `StopFcn`.) See Creating Callback Functions for more information.	Date type	Text string, function handle, or cell array
		Default	None
		Read only	Never
`Tag`	User supplied label.	Data type	Text string
		Default	Empty string (`‘‘`)
		Read only	Never
`TasksToExecute`	Specifies the number of times thetimer should execute the function specified in the `TimerFcn` property. 指定回调函数的执行次数	Data type	`double`
		Values	Any number > 0
		Default	`Inf`
		Read only	Never
`TasksExecuted`	The number of times the timer has called `TimerFcn` since the timer was started. 计时器开启后的执行次数	Data type	`double`
		Values	Any number >= 0
		Default	0
		Read only	Always
`TimerFcn`	Timer callback function. SeeCreating Callback Functions for more information.	Data type	Text string, function handle, or cell array
		Default	None
		Read only	Never