[FMFP] Modelling

semester4/fmfp/code/promela/00_basics.pml

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+// --- Constants -----------------------------------------------
+// As C preprocessor macros
+#define N 5
+
+// Symbolic constant
+mtype = { ack, req };
+
+
+// --- Typedef -------------------------------------------------
+// Structure declarations
+typedef vector { int x; int y };
+
+
+// --- Channels ------------------------------------------------
+// Channels are used to exchange messages between processes
+chan buf = [2] of { int }; // can store up to 2 integers
+chan buf2 = [2] of { mtype, bit, chan }; // Messages are Triples
+chan channel = [0] of { int }; // No buffer
+chan unassigned_chan; // This channel is unassigned
+
+
+// --- Variables -----------------------------------------------
+// Note that there are no floats and unbounded integers.
+// Variables are initialized to 0 (ish) values
+// If defined outside a process, they are global, if inside,
+// they are scoped to said process
+bit bit_val; // 1 bit
+bool bool_val; // Equivalent to bit, also 1 bit
+byte counter; // 1 byte (0...255)
+short short_val; // 2 bytes (-2^15 ... 2^15 - 1)
+int val; // 4 bytes
+int arr[4]; // 16 bytes, array of four integers
+vector v; // using the custom vector type
+mtype msg = ack; // Using the symbolic constant
+
+
+// --- Processes -----------------------------------------------
+// Process declarations
+proctype myProc(int p) {
+    // Like the init body, any promela statements go in here
+    // This includes any variable or channel declarations
+    printf("My process");
+}
+
+active [N] proctype myActiveProc(int p) {
+    // Body goes here
+}
+
+
+// --- Initial state -------------------------------------------
+init {
+    printf("Hello World");
+}