Add the rest of university notes

docs/lectures/osc/02_threads.md

@@ -10,7 +10,7 @@ A process consists of two **fundamental** units
 
 A process can share its resources between multiple execution traces, e.g multiple threads running in the same resource environment.
 
-![Image](/lectures/osc/assets/9.png)
+![Image](assets/9.png)
 
 Every thread has its own *execution context* (e.g. program counter, stack, registers).
 All threads have **access** to the process' **shared resources**
@@ -22,7 +22,7 @@ All threads have **access** to the process' **shared resources**
 Similar to processes, threads have:
 **States**, **transitions** and a **thread control block**
 
-![Image](/lectures/osc/assets/a.png)
+![Image](assets/A.png)
 
 The *registers*, *stack* and *state* are all specific to the registers. When a context switch occurs they must be stored in the **thread control block**.
 
@@ -60,7 +60,7 @@ Such activities should be carried out in parallel on threads. e.g. web-servers,
 **Kernel** threads - ask the OS to create a tread for the user and give it to the user.
 **Hybrid** implementations - is what is used in windows 10
 
-![Image](/lectures/osc/assets/d.png)
+![Image](assets/d.png)
 
 **Pros and cons of user threads**
 
@@ -85,7 +85,7 @@ Advantages:
 
 However frequent **mode switches** take place, resulting in a lower performance.
 
-![Image](/lectures/osc/assets/e.png)
+![Image](assets/E.png)
 
 Kernel threads are slower to create and sync that user level however user level cannot exploit parallelism.
 
@@ -96,7 +96,7 @@ Kernel threads are slower to create and sync that user level however user level
 >
 >User application sees user threads and creates/schedules these (an unrestricted number)
 
-![Image](/lectures/osc/assets/f.png)
+![Image](assets/f.png)
 
 Thread libraries provide an API for managing threads
 Thread libraries can be implemented
@@ -113,9 +113,9 @@ Examples of thread APIs include **POSIX PThreads**, windows threads and Java thr
 `pthread_attr_init`   - Thread Attributes (e.g. priority)
 `pthread_attr_destroy`   - Release Attributes
 
-$ ~ man `pthread_create` returns the help page
+`$ ~ man pthread_create` returns the help page
 
-![img](/lectures/osc/assets/g.png)
+![img](assets/G.png)
 
 ```
 $ ~ HELLO from thread 10