From 69d606de2cb171bef5936459e12fbc299c3c63fb Mon Sep 17 00:00:00 2001
From: Anton Khirnov <anton@khirnov.net>
Date: Thu, 6 Dec 2018 11:30:36 +0100
Subject: mg2d: define log levels

---
 mg2d.c | 12 +++++++-----
 mg2d.h | 35 +++++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+), 5 deletions(-)

diff --git a/mg2d.c b/mg2d.c
index eb4efaf..4b01ae6 100644
--- a/mg2d.c
+++ b/mg2d.c
@@ -380,7 +380,7 @@ int mg2d_solve(MG2DContext *ctx)
                           priv->root->solver->residual_stride * ctx->domain_size);
 
         if (res_cur < ctx->tol) {
-            mg2di_log(&priv->logger, 0, "converged on iteration %d, residual %g\n",
+            mg2di_log(&priv->logger, MG2D_LOG_INFO, "converged on iteration %d, residual %g\n",
                       i, res_cur);
 
             priv->time_solve += gettime() - time_start;
@@ -389,12 +389,13 @@ int mg2d_solve(MG2DContext *ctx)
             return 0;
         }
 
-        mg2di_log(&priv->logger, 0, "finished toplevel iteration %d, residual %g -> %g (%g)\n",
+        mg2di_log(&priv->logger, MG2D_LOG_VERBOSE,
+                  "finished toplevel iteration %d, residual %g -> %g (%g)\n",
                   i, res_prev, res_cur, res_prev / res_cur);
         res_prev = res_cur;
     }
 
-    mg2di_log(&priv->logger, 0, "The solver failed to converge\n");
+    mg2di_log(&priv->logger, MG2D_LOG_ERROR, "The solver failed to converge\n");
     return -EDOM;
 }
 
@@ -574,7 +575,7 @@ void mg2d_print_stats(MG2DContext *ctx, const char *prefix)
     if (!prefix)
         prefix = "";
 
-    mg2di_log(&priv->logger, 2, "%s%ld solves; %g s total time; %g ms avg per call\n",
+    mg2di_log(&priv->logger, MG2D_LOG_VERBOSE, "%s%ld solves; %g s total time; %g ms avg per call\n",
               prefix, priv->count_solve, priv->time_solve / 1e6, priv->time_solve / 1e3 / priv->count_solve);
 
     while (level) {
@@ -582,7 +583,8 @@ void mg2d_print_stats(MG2DContext *ctx, const char *prefix)
                               level->time_correct + level->time_reinit;
         int64_t relax_total = level->solver->time_correct + level->solver->time_res_calc + level->solver->time_boundaries;
 
-        mg2di_log(&priv->logger, 2, "%s%2.2f%% level %d: %ld cycles %g s total time %g ms avg per call || "
+        mg2di_log(&priv->logger, MG2D_LOG_VERBOSE,
+                  "%s%2.2f%% level %d: %ld cycles %g s total time %g ms avg per call || "
                   "%2.2f%% relax %2.2f%% prolong %2.2f%% restrict %2.2f%% correct %2.2f%% reinit || "
                   "%2.2f%% residual %2.2f%% correct %2.2f%% boundaries\n",
                   prefix, level_total * 100.0 / priv->time_solve, level->depth, level->count_cycles,
diff --git a/mg2d.h b/mg2d.h
index 4ccb5da..2682918 100644
--- a/mg2d.h
+++ b/mg2d.h
@@ -95,6 +95,41 @@ enum MG2DDiffCoeff {
     MG2D_DIFF_COEFF_NB,
 };
 
+enum MG2DLogLevel {
+    /**
+     * The log message indicates abnormal program failure. Should never happen
+     * unless there are bugs or grossly invaid user input.
+     * Will typically be followed by program termination.
+     */
+    MG2D_LOG_FATAL = 0x0,
+    /**
+     * The log message indicates an error state, so that requested operation
+     * cannot complete successfully.
+     * Will typically be followed by the API function being called returning an
+     * error.
+     */
+    MG2D_LOG_ERROR = 0x10,
+    /**
+     * The log message indicates a suspicious or suboptimal program state.
+     */
+    MG2D_LOG_WARNING = 0x20,
+    /**
+     * The log message provides commonly useful information about normal program
+     * behaviour.
+     */
+    MG2D_LOG_INFO = 0x30,
+    /**
+     * The log message provides detailed extra information about normal program
+     * behaviour.
+     */
+    MG2D_LOG_VERBOSE = 0x40,
+    /**
+     * The log message provides highly detailed extra information about normal
+     * program behaviour.
+     */
+    MG2D_LOG_DEBUG = 0x50,
+};
+
 typedef struct MG2DInternal MG2DInternal;
 
 /**
-- 
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