1 files changed, 16 insertions, 2 deletions

diff --git a/proj0.txt b/proj0.txt
index c4aa3dc..22939fc 100644
--- a/proj0.txt
+++ b/proj0.txt
@@ -34,6 +34,11 @@ TODO
 struct thread:
 int64_t wakeup_tick  ...absolute tick when to wake up the thread
 
+
+timer.c:
+static struct list wakeup_list  ...list of processes waiting for an 
+wakeup event and currently put to sleep
+
 ---- ALGORITHMS ----
 
 >> A2: Briefly describe what happens in a call to timer_sleep(),
@@ -56,7 +61,11 @@ Thus we can return as soon as the first thread doesn't need to get unblocked.
 >> A4: How are race conditions avoided when multiple threads call
 >> timer_sleep() simultaneously?
 
-TODO
+Each thread has its own variable for saving its sleep period 
+therefore no race conditions arise while setting the latter. Furthermore
+during the access to the static wakup_list, interrupts are disabled to prevent
+thread preemption.
+
 
 >> A5: How are race conditions avoided when a timer interrupt occurs
 >> during a call to timer_sleep()?
@@ -120,7 +129,12 @@ strtok() uses global data, so it is unsafe in threaded programs such as kernels.
 * Possible bugs in the code will either just break the shell or allow code
   execution with user privileges. Otherwise this could lead to a kernel oops
   or even worse code execution within the kernel.
-TODO
+
+Outsourcing command separation from the kernel leads to a leaner 
+less complex kernel implementation and reduces the kernel workload
+because tasks like searching for a command name in file system 
+can be delegated to the shell.
+
 
                            SURVEY QUESTIONS
                            ================