1 files changed, 66 insertions, 0 deletions
diff --git a/modules/benchmark/nqueens.c b/modules/benchmark/nqueens.c
new file mode 100644
index 00000000..a32ed8c1
--- /dev/null
+++ b/modules/benchmark/nqueens.c
@@ -0,0 +1,66 @@
+/*
+ * N-Queens Problem Solver
+ * Found somewhere on the Internet; can't remember where. Possibly Wikipedia.
+ */
+#include <stdio.h>
+#include <stdbool.h>
+#include <stdlib.h>
+
+#include "hardinfo.h"
+#include "benchmark.h"
+
+#define QUEENS 11
+
+int row[QUEENS];
+
+bool safe(int x, int y)
+{
+    int i;
+    for (i = 1; i <= y; i++)
+	if (row[y - i] == x || row[y - i] == x - i || row[y - i] == x + i)
+	    return false;
+    return true;
+}
+
+int nqueens(int y)
+{
+    int x;
+    
+    for (x = 0; x < QUEENS; x++) {
+	if (safe((row[y - 1] = x), y - 1)) {
+	    if (y < QUEENS) {
+		nqueens(y + 1);
+	    } else {
+	        break;
+            }
+        }
+    }
+    
+    return 0;
+}
+
+static gpointer nqueens_for(unsigned int start, unsigned int end, void *data, gint thread_number)
+{
+    unsigned int i;
+    
+    for (i = start; i <= end; i++) { 
+        nqueens(0);
+    }
+    
+    return NULL;
+}
+
+void
+benchmark_nqueens(void)
+{
+    gdouble elapsed = 0;
+    
+    shell_view_set_enabled(FALSE);
+    shell_status_update("Running N-Queens benchmark...");
+        
+    elapsed = benchmark_parallel_for(0, 10, nqueens_for, NULL);
+    
+    bench_results[BENCHMARK_NQUEENS] = elapsed;
+}
+
+