.net barcode scanner sdk The how and why of Shared MeMory in Software

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The how and why of Shared MeMory
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The program we write resides in main RAM in the hub. On startup, each cog downloads the interpreter from the main ROM to its RAM. When it is the cog s turn to access the system, it fetches tokens from its part of main RAM, as was assigned in the stack space for it, and executes these tokens in its memory space. In this way, all the cogs can be executing their part of the code at the same time. All the cogs have access to all the I/O lines at all times. All the variables we declare in the VAR block of the program listing are available to each of the cogs whenever they have access to the shared memory. The variables can be divided into two families as static and dynamic variables.
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If the selected variable can be considered to be valid at all times or if our interest is in the variable at the time when we read it (whenever that may be), the variable can be considered static. This would be true for a variable such as the temperature we were maintaining within a reactor vessel in a chemical plant. It does not particularly matter when exactly we read the variable because we are interested in the current temperature only. No handshake or other confirmations are required for reading variables that meet this requirement.
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A dynamic variable is a variable that changes from time to time and our interest is in the time history of this variable. We may want to know what the elevation of a rocket was for every millisecond of its assent. For such variables, it is necessary to set some sort of protocol that will make sure each data point was read at the appropriate time. Which cog does what at what time is decided by the programmer, so the storage of the data points is assigned as a critical task to one cog. The data is read by the other cogs as time allows. For data that changes slowly (say, once a minute), we can set up a simple handshake arrangement to transfer the information. The simplest scheme involves using a flag. Cog_one places the data and sets the data valid flag. Cog_two reads the data and then clears the data valid flag. The first cog waits for the data valid flag to be cleared, replaces the data, and resets the data valid flag. As soon as the flag is set again, the second cog reads the data again, and so on. Other variables have mixed characteristics and the techniques for reading them are mixtures of what we have discussed previously. If a variable of interest is changing extremely rapidly, the cog creating the data has to store the data in one or two arrays, and the data is read an array at a time (alternating arrays if necessary) as system resources allow time to get the job done. Appropriate flags are created and used as was done with single data points.
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The variables that we use have to be created and modified in such a way that they are always current. Let s look at an example. Suppose we want to read the value of a variable (X) for use in two cogs, where one cog determines X and the other cog displays it. In order for X to be valid at all times, it cannot be used in any calculations of formulas other than the one that sets it, and it has to be set in such a way that it is always valid. Suppose the value of Y was determined as the square of a number plus 1. You cannot write this code as the following:
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