From c7e69beb52c2c47182eaf8295025a668d0eefd80 Mon Sep 17 00:00:00 2001
From: Sameer Agarwal <sameeragarwal@google.com>
Date: Tue, 16 Apr 2013 09:39:16 -0700
Subject: [PATCH] Add a missing mutex lock in the SchurEliminator. This was
 lost somewhere along in the BLAS based refactoring.

Change-Id: I90b94fa9c3a8ea1b900a18f76ef6a7d0dbf24318
---
 internal/ceres/schur_eliminator_impl.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/internal/ceres/schur_eliminator_impl.h b/internal/ceres/schur_eliminator_impl.h
index 5afb2f2e1..050b1cf60 100644
--- a/internal/ceres/schur_eliminator_impl.h
+++ b/internal/ceres/schur_eliminator_impl.h
@@ -676,6 +676,7 @@ EBlockRowOuterProduct(const BlockSparseMatrixBase* A,
                                          &row_stride, &col_stride);
       if (cell_info != NULL) {
         // block += b1.transpose() * b2;
+        CeresMutexLock l(&cell_info->m);
         MatrixTransposeMatrixMultiply
             <kRowBlockSize, kFBlockSize, kRowBlockSize, kFBlockSize, 1>(
                 row_values + row.cells[i].position, row.block.size, block1_size,