From 11614b4a2dd326c7c1e8a0d771dea0fa77339387 Mon Sep 17 00:00:00 2001
From: WickedJack99 <github.0yiic@passmail.net>
Date: Sun, 29 Jun 2025 21:45:29 +0200
Subject: [PATCH] .

---
 lab12/exc4/jacobi.cpp | 25 ++++++++++++-------------
 1 file changed, 12 insertions(+), 13 deletions(-)

diff --git a/lab12/exc4/jacobi.cpp b/lab12/exc4/jacobi.cpp
index 62ce24c..f976d49 100644
--- a/lab12/exc4/jacobi.cpp
+++ b/lab12/exc4/jacobi.cpp
@@ -104,25 +104,25 @@ void Jacobi::exchangeHaloLayersNodeMPIProcSecond(Matrix &phi)
     // communication with second rank on same node via shared memory
     // We write our send row to shared memory row 0
 
-    while (states->shmStates[0] == SharedmemState::Unread)
+    while (states->shmStates[1] == SharedmemState::Unread)
     {
       MPI_Win_sync(win_);
     }
 
     for (int j = 0; j < sendSize; ++j)
-      shm0[j] = phi(1, j);
-    states->shmStates[0] = SharedmemState::Unread;
+      shm1[j] = phi(1, j);
+    states->shmStates[1] = 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->shmStates[1] == SharedmemState::Read)
+    while (states->shmStates[0] == SharedmemState::Read)
     {
       MPI_Win_sync(win_);
     }
 
     for (int j = 0; j < sendSize; ++j)
-      phi(0, j) = shm1[j]; // halo from second proc
-    states->shmStates[1] = SharedmemState::Read;
+      phi(0, j) = shm0[j]; // halo from second proc
+    states->shmStates[0] = SharedmemState::Read;
     MPI_Win_sync(win_);
   }
 
@@ -157,7 +157,7 @@ void Jacobi::exchangeHaloLayersNodeMPIProcFirst(Matrix &phi)
     // communication with second rank on same node via shared memory
     // We write our send row to shared memory row 0
 
-    while (states->shmStates[1] == SharedmemState::Unread)
+    while (states->shmStates[0] == SharedmemState::Unread)
     {
       MPI_Win_sync(win_);
     }
@@ -167,14 +167,13 @@ void Jacobi::exchangeHaloLayersNodeMPIProcFirst(Matrix &phi)
     }
 
     for (int j = 0; j < sendSize; ++j)
-      shm1[j] = phi(n - 2, j); // our last inner row
-    states->shmStates[1] = SharedmemState::Unread;
+      shm0[j] = phi(n - 2, j); // our last inner row
+    states->shmStates[0] = 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->shmStates[0] == SharedmemState::Read)
+    while (states->shmStates[1] == SharedmemState::Read)
     {
-
       MPI_Win_sync(win_);
     }
     if (rank_ == (numProc_ - 2))
@@ -182,12 +181,12 @@ void Jacobi::exchangeHaloLayersNodeMPIProcFirst(Matrix &phi)
       std::cout << "t2" << std::endl;
     }
     for (int j = 0; j < sendSize; ++j)
-      phi(n - 1, j) = shm0[j]; // halo from first proc
+      phi(n - 1, j) = shm1[j]; // halo from second proc
     if (rank_ == (numProc_ - 2))
     {
       std::cout << "t3" << std::endl;
     }
-    states->shmStates[0] = SharedmemState::Read;
+    states->shmStates[1] = SharedmemState::Read;
     MPI_Win_sync(win_);
   }