ModuleSDK update + C++-related changes (#525)

* Updated redismodule.h

* C++-related changes

* Small fix in torch_c.cpp

* Added REDISMODULE_MAIN to backends

Author: rafie

src/backends/onnxruntime.c

@@ -1,3 +1,4 @@
+#define REDISMODULE_MAIN
 #include <cuda_provider_factory.h>
 #include "backends/onnxruntime.h"
 #include "backends/util.h"

src/backends/tensorflow.c

@@ -1,3 +1,4 @@
+#define REDISMODULE_MAIN
 #include "backends/tensorflow.h"
 #include "backends/util.h"
 #include "tensor.h"

src/backends/tflite.c

@@ -1,3 +1,4 @@
+#define REDISMODULE_MAIN
 #include "backends/tflite.h"
 #include "backends/util.h"
 #include "tensor.h"

src/backends/torch.c

@@ -1,3 +1,4 @@
+#define REDISMODULE_MAIN
 #include "backends/torch.h"
 #include "backends/util.h"
 #include "tensor.h"

src/background_workers.h

@@ -9,13 +9,13 @@
  *
  */
 
-#if defined(__linux__)
-#define _GNU_SOURCE
-#endif
-
 #ifndef SRC_BACKGROUND_WORKERS_H_
 #define SRC_BACKGROUND_WORKERS_H_
 
+#if defined(__linux__) && !defined(_GNU_SOURCE)
+#define _GNU_SOURCE
+#endif
+
 #include <pthread.h>
 
 #include "config.h"

src/redisai.c

@@ -1,3 +1,4 @@
+#define REDISMODULE_MAIN
 #include "redismodule.h"
 #include "tensor.h"
 

src/redisai.h

@@ -118,12 +118,22 @@ RedisModuleType *MODULE_API_FUNC(RedisAI_ScriptRedisType)(void);
 
 int MODULE_API_FUNC(RedisAI_GetLLAPIVersion)();
 
+#ifndef __cplusplus
 #define REDISAI_MODULE_INIT_FUNCTION(ctx, name)                                                    \
     RedisAI_##name = RedisModule_GetSharedAPI(ctx, "RedisAI_" #name);                              \
     if (!RedisAI_##name) {                                                                         \
         RedisModule_Log(ctx, "warning", "could not initialize RedisAI_" #name "\r\n");             \
         return REDISMODULE_ERR;                                                                    \
     }
+#else
+#define REDISAI_MODULE_INIT_FUNCTION(ctx, name)                                                    \
+    RedisAI_##name = reinterpret_cast<decltype(RedisAI_##name)>(                                   \
+        RedisModule_GetSharedAPI((RedisModuleCtx *)(ctx), "RedisAI_" #name));                      \
+    if (!RedisAI_##name) {                                                                         \
+        RedisModule_Log(ctx, "warning", "could not initialize RedisAI_" #name "\r\n");             \
+        return REDISMODULE_ERR;                                                                    \
+    }
+#endif
 
 static int RedisAI_Initialize(RedisModuleCtx *ctx) {