From 508617ad41704ce539eb32a0d2c79d46174289ee Mon Sep 17 00:00:00 2001
From: WickedJack99 <github.0yiic@passmail.net>
Date: Sun, 29 Jun 2025 20:12:50 +0200
Subject: [PATCH] .

---
 lab12/exc4/jacobi.cpp | 32 ++++++++++++++++----------------
 lab12/exc4/jacobi.h   | 23 +++++++++++------------
 2 files changed, 27 insertions(+), 28 deletions(-)

diff --git a/lab12/exc4/jacobi.cpp b/lab12/exc4/jacobi.cpp
index e32aa71..2c7488e 100644
--- a/lab12/exc4/jacobi.cpp
+++ b/lab12/exc4/jacobi.cpp
@@ -92,28 +92,28 @@ void Jacobi::exchangeHaloLayersNodeMPIProcFirst(Matrix &phi)
   // Communication with lower partner
   if (!isFirstRank())
   {
-    SharedmemStates *states = reinterpret_cast<SharedmemStates *>(baseptr);
+    SharedmemStates *states = reinterpret_cast<SharedmemStates *>(baseptr_);
     double *shm0 = reinterpret_cast<double *>(states + 1); // row 0
-    double *shm1 = shm0 + cols;                            // row 1
+    double *shm1 = shm0 + sendSize;                            // row 1
 
     // communication with second rank on same node via shared memory
     // We write our send row to shared memory row 0
 
-    while (states[0] == SharedmemState::Unread)
+    while (states.shmStates[0] == SharedmemState::Unread)
     {MPI_Win_sync(win_);}
     
     for (int j = 0; j < sendSize; ++j)
-      shm0[j] = phi(n - 2, j); // our last inner row
-    states[0] = SharedmemState::Unread;
+      shm0[j] = phi(1, j);
+    states.shmStates[0] = SharedmemState::Unread;
     MPI_Win_sync(win_); // ensure memory visibility
 
     // Wait for second proc to write its row back to shared memory row 1
-    while (states[1] == SharedmemState::Read)
+    while (states.shmStates[1] == SharedmemState::Read)
     {MPI_Win_sync(win_);}
 
     for (int j = 0; j < sendSize; ++j)
-      phi(n - 1, j) = shm1[j]; // halo from second proc
-    states[1] = SharedmemState::Read;
+      phi(0, j) = shm1[j]; // halo from second proc
+    states.shmStates[1] = SharedmemState::Read;
   }
 
   // Wait for communication to finish
@@ -132,28 +132,28 @@ void Jacobi::exchangeHaloLayersNodeMPIProcSecond(Matrix &phi)
   // Communication with upper partner
   if (!isLastRank())
   {
-    SharedmemStates *states = reinterpret_cast<SharedmemStates *>(baseptr);
+    SharedmemStates *states = reinterpret_cast<SharedmemStates *>(baseptr_);
     double *shm0 = reinterpret_cast<double *>(states + 1); // row 0
-    double *shm1 = shm0 + cols;                            // row 1
+    double *shm1 = shm0 + sendSize;                            // row 1
 
     // communication with second rank on same node via shared memory
     // We write our send row to shared memory row 0
 
-    while (states[1] == SharedmemState::Unread)
+    while (states.shmStates[1] == SharedmemState::Unread)
     {MPI_Win_sync(win_);}
     
     for (int j = 0; j < sendSize; ++j)
-      shm1[j] = phi(1, j); // our last inner row
-    states[1] = SharedmemState::Unread;
+      shm1[j] = phi(n - 2, j); // our last inner row
+    states.shmStates[1] = SharedmemState::Unread;
     MPI_Win_sync(win_); // ensure memory visibility
     
     // Wait for first proc to write its row back to shared memory row 0
-    while (states[0] == SharedmemState::Read)
+    while (states.shmStates[0] == SharedmemState::Read)
     {MPI_Win_sync(win_);}
 
     for (int j = 0; j < sendSize; ++j)
-      phi(0, j) = shm0[j]; // halo from first proc
-    states[0] = SharedmemState::Read;
+      phi(n - 1, j) = shm0[j]; // halo from first proc
+    states.shmStates[0] = SharedmemState::Read;
   }
 
   // Communication with lower partner
diff --git a/lab12/exc4/jacobi.h b/lab12/exc4/jacobi.h
index e7a95d6..f03007a 100644
--- a/lab12/exc4/jacobi.h
+++ b/lab12/exc4/jacobi.h
@@ -3,6 +3,17 @@
 
 #include "matrix.h"
 
+enum SharedmemState
+{
+  Unread = 0,
+  Read = 1
+};
+
+struct SharedmemStates
+{
+  SharedmemState shmStates[2];        // Flags: one for each row
+};
+
 /**
  * Base class for Jacobi algorithms.
  * Defines a struct result which is returned by the algorithm.
@@ -70,18 +81,6 @@ class Jacobi {
   };
 };
 
-enum SharedmemState
-{
-  Unread = 0,
-  Read = 1
-};
-
-struct SharedmemStates
-{
-  SharedmemState shmStates[2];        // Flags: one for each row
-};
-
-
 // 4 times horizontal split | with mpi
 
 // 12 times vertical split - with openmp