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Published online by Cambridge University Press: 07 October 2009
This chapter is the first of three tutorial chapters on the basic features and programming techniques of CML. This chapter focuses on the features that make up CML's semantic core. The next chapter continues with a discussion of the two most important styles of CML programming: process networks and client-server protocols. Chapter 5 completes the tutorial with further discussion of CML's synchronization and communication mechanisms.
Sequential programming
As is the case with most concurrent languages, CML consists of a sequential core language — Standard ML — extended with concurrency primitives. The individual processes in a CML program are programmed using the features of SML. While we conceptually view CML as a programming language, it is actually implemented as a collection of modules on top of SML/NJ. The aspects of CML described in this chapter all belong to the core structure of this library, which is named CML. To reduce notational clutter, most of the examples in this chapter are assumed to be given in an environment where the CML structure has been pre-opened (i.e., all of its bindings are at top-level). The CML structure's interface is described in Appendix A, which contains an abridged version of the CML Reference Manual.
CML is a message-passing language, which means that processes are viewed as executing in independent address spaces with their only communication being via messages. But, since SML provides updatable references, this is a fiction that must be maintained by programming style and convention.
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