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Concurrent Systems/notes/Lezione1.md

@@ -18,4 +18,12 @@ We can assume many features:
 - Shared memory vs Channel-based communication
 
 **Reliable** system: every process correctly executes its program
-**Async**
+
+**Asynchronous:** no timing assumption (every process has its own clock, which are independent one from the other)
+
+**Shared medium:** A way is through a shared memory area, another way is through message passing.
+For this part of the course we assume that every process has a local memory but can access a shared part of the memory. We will assume that memory is split into registers (will see later).
+
+For now, we will assume that processes won't fail.
+We also assume that we have one processor per process. But actually the processor can be a shared resource (more processes than processors).
+