1 files changed, 41 insertions, 0 deletions
diff --git a/CS3871/sync/assign.rst b/CS3871/sync/assign.rst
new file mode 100644
index 0000000..ea4a566
--- /dev/null
+++ b/CS3871/sync/assign.rst
@@ -0,0 +1,41 @@
+================
+Syncronization 1
+================
+
+Write a program that uses semaphores to implement a readers/writers solution. Your program should:
+
+    - be written in C and use the standard kernel IPC mechanisms (semget,semop,shmget etc)
+    - be written as a single top level source file compiled as:  gcc –o myprog  myprog.c
+    - take two arguments on the command line:   myprog NR NW  where NR,NW are each integers specifying the number of reader/writer processes respectively
+    - use fork/exec to create the readers/writers
+
+The shared memory segment should be 16k bytes in size, with all bytes initialized to 0x30
+
+Reader:
+
+.. code ::
+
+  open a file (for append) named reader.N, where N is the reader number
+  while (1) {
+        for (i=0; i<16k; i++) {
+                  read the next byte of the shared memory segment
+                  write that byte to the file
+                  flush the file
+        }
+        sleep a random number of seconds, between 0 and N inclusive
+  }
+
+Writer:
+
+.. code ::
+
+        while (1) {
+	        for (i=0; i<16k; i++)
+	        	shared memory segment[i] = N + 0x30;
+        	sleep a random number of seconds between 0 and 2*N inclusive
+        }
+
+readers and writers should be mutually exclusive
+multiple concurrent readers are allowed
+writers have priority over readers
+writers are mutually exclusive relative to each other