Requested changes

-Remove g_displaylevel/setNotificationLevel function
-Add extern "C"
-Remove averaging
-Reorder arguments

More fixes

-Added BMK_return_t (result + possible error)
-Correct comment'
-Nullcheck ctx, dctx when allocated
-Remove extra assert

programs/bench.h

@@ -8,6 +8,9 @@
  * You may select, at your option, one of the above-listed licenses.
  */
 
+#if defined (__cplusplus)
+extern "C" {
+#endif
 
 #ifndef BENCH_H_121279284357
 #define BENCH_H_121279284357
@@ -22,21 +25,25 @@ typedef struct {
     double dSpeed;
 } BMK_result_t;
 
+/* 0 = no Error */
+typedef struct {
+	int errorCode;
+	BMK_result_t result;
+} BMK_return_t;
+
 /* called in cli */
 int BMK_benchFiles(const char** fileNamesTable, unsigned nbFiles, const char* dictFileName,
-                   int cLevel, int cLevelLast, const ZSTD_compressionParameters* compressionParams);
-
-/* more options */
-BMK_result_t BMK_benchFilesFull(const char** fileNamesTable, unsigned nbFiles, const char* dictFileName,
-                   int cLevel, int cLevelLast, const ZSTD_compressionParameters* compressionParams,
-                   int printable);
+                   int cLevel, int cLevelLast, const ZSTD_compressionParameters* compressionParams, 
+                   int displayLevel);
 
 /* basic benchmarking function, called in paramgrill
- * results, cctx, dctx, dictbuffer can be null or passed in */
-BMK_result_t BMK_benchMem(const void* srcBuffer, size_t srcSize, const char* displayName, int cLevel,
-                 const size_t* fileSizes, unsigned nbFiles, const void* dictBuffer, size_t dictBufferSize,
-                 const ZSTD_compressionParameters* const comprParams, ZSTD_CCtx* ctx, ZSTD_DCtx* dctx,
-                 int printable);
+ * ctx, dctx must be valid */
+BMK_return_t BMK_benchMem(const void* srcBuffer, size_t srcSize,
+                        const size_t* fileSizes, unsigned nbFiles,
+                        const int cLevel, const ZSTD_compressionParameters* comprParams,
+                        const void* dictBuffer, size_t dictBufferSize,
+                        ZSTD_CCtx* ctx, ZSTD_DCtx* dctx,
+                        int displayLevel, const char* displayName);
 
 /* Set Parameters */
 void BMK_setNbSeconds(unsigned nbLoops);
@@ -54,3 +61,7 @@ void BMK_setLdmBucketSizeLog(unsigned ldmBucketSizeLog);
 void BMK_setLdmHashEveryLog(unsigned ldmHashEveryLog);
 
 #endif   /* BENCH_H_121279284357 */
+
+#if defined (__cplusplus)
+}
+#endif