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This top-down structuring approach often starts with a pseudocode sketch refined into executable code. Pseudocode is also used in standardization; for example, the MPEG standards rely on formal C-like pseudocode, these standards cannot be understood without grasping the details of the code. [4]
Machine code is generally different from bytecode (also known as p-code), which is either executed by an interpreter or itself compiled into machine code for faster (direct) execution. An exception is when a processor is designed to use a particular bytecode directly as its machine code, such as is the case with Java processors .
PSeInt is designed to assist students who start in the construction of computer algorithms or programs. The pseudocode is usually used as the first contact to introduce basic concepts such as the use of control structures, expressions, variables, etc., without having to deal with the particularities of the syntax of a real language.
Pseudo code serves the function of real code in expressing algorithms. Technically source code is pseudo code. It must be translated into machine code. Assembly macros are pseudo assembly insttuctions. They appear in assembly source as a single instruction. On translation to machine code a macro may expand to any number of lines of assembly.
Skeleton code is used to assist programmers to develop their code with the fewest errors during the time of compilation. Skeleton code is most commonly found in parallel programming, but is also applied in other situations, like documentation in programming languages. This helps to simplify the core functionality of a potentially confusing method.
The following pseudocode [1] [3] shows the operations for initializing the lock, acquiring the lock, and releasing the lock. A call to ticketLock_acquire would precede the critical section of the code and ticketLock_release would follow it. Each processor will keep track of its turn via the value of each processor's my_ticket.
The algorithm uses two variables: flag and turn. A flag[n] value of true indicates that the process n wants to enter the critical section. Entrance to the critical section is granted for process P0 if P1 does not want to enter its critical section or if P1 has given priority to P0 by setting turn to 0. Peterson's algorithm
The S/SL processor compiles this pseudocode into a table (byte-codes) that is interpreted by the S/SL table-walker (interpreter). The pseudocode language processes the input language in LL(1) recursive descent style but extensions allow it to process any LR(k) language relatively easily. [2]