fixed GPU samples and MultiGpuMgr

modules/gpu/include/opencv2/gpu/gpu.hpp

@@ -139,9 +139,6 @@ namespace cv
         public:
             MultiGpuMgr();
 
-            // Returns the current GPU id (or BAD_GPU_ID if no GPU is active)
-            int currentGpuId() const;
-
             // Makes the given GPU active
             void gpuOn(int gpu_id);
 

modules/gpu/src/multi_gpu_mgr.cpp

@@ -48,7 +48,6 @@ namespace cv { namespace gpu {
 
 class MultiGpuMgr::Impl {};
 MultiGpuMgr::MultiGpuMgr() { throw_nogpu(); }
-int MultiGpuMgr::currentGpuId() const { throw_nogpu(); return 0; }
 void MultiGpuMgr::gpuOn(int) { throw_nogpu(); }
 void MultiGpuMgr::gpuOff() { throw_nogpu(); }
 
@@ -78,31 +77,15 @@ public:
             cuSafeCall(cuCtxDestroy(contexts_[i]));
     }
 
-    int currentGpuId() const
-    {
-        if (gpu_id_stack_.empty())
-            return MultiGpuMgr::BAD_GPU_ID;
-        return gpu_id_stack_.top();
-    }
-
     void gpuOn(int gpu_id)
     {
-        if (gpu_id != currentGpuId())
-        {
-            cuSafeCall(cuCtxPushCurrent(contexts_[gpu_id]));
-            gpu_id_stack_.push(gpu_id);
-        }
+        cuSafeCall(cuCtxPushCurrent(contexts_[gpu_id]));
     }
 
     void gpuOff()
     {
-        if (gpu_id_stack_.empty())
-            return;
-
         CUcontext prev_context;
         cuSafeCall(cuCtxPopCurrent(&prev_context));
-
-        gpu_id_stack_.pop();
     }
 
 private:
@@ -113,7 +96,6 @@ private:
     }
 
     int num_devices_;
-    stack<int> gpu_id_stack_;
     vector<CUcontext> contexts_;
 };
 
@@ -134,16 +116,9 @@ MultiGpuMgr::Impl::Impl(): num_devices_(0)
 }
 
 
-
 MultiGpuMgr::MultiGpuMgr(): impl_(new Impl()) {}
 
 
-int MultiGpuMgr::currentGpuId() const
-{
-    return impl_->currentGpuId();
-}
-
-
 void MultiGpuMgr::gpuOn(int gpu_id)
 {
     impl_->gpuOn(gpu_id);

samples/gpu/multi.cpp

@@ -39,11 +39,13 @@ using namespace cv::gpu;
 struct Worker { void operator()(int device_id) const; };
 void destroyContexts();
 
-#define safeCall(code) if (code != CUDA_SUCCESS) { \
-    cout << "CUDA driver API error: code " << code \
-        << ", file " << __FILE__ << ", line " << __LINE__ << endl; \
-    destroyContexts(); \
-    exit(-1); \
+#define safeCall(expr) safeCall_(expr, #expr, __FILE__, __LINE__)
+inline void safeCall_(int code, const char* expr, const char* file, int line)
+{
+    cout << "CUDA driver API error: code " << code << ", expr " << expr
+        << ", file " << file << ", line " << line << endl;
+    destroyContexts();
+    exit(-1);
 }
 
 // Each GPU is associated with its own context

samples/gpu/stereo_multi.cpp

@@ -41,11 +41,13 @@ using namespace cv::gpu;
 struct Worker { void operator()(int device_id) const; };
 void destroyContexts();
 
-#define safeCall(code) if (code != CUDA_SUCCESS) { \
-    cout << "CUDA driver API error: code " << code \
-        << ", file " << __FILE__ << ", line " << __LINE__ << endl; \
-    destroyContexts(); \
-    exit(-1); \
+#define safeCall(expr) safeCall_(expr, #expr, __FILE__, __LINE__)
+inline void safeCall_(int code, const char* expr, const char* file, int line)
+{
+    cout << "CUDA driver API error: code " << code << ", expr " << expr
+        << ", file " << file << ", line " << line << endl;
+    destroyContexts();
+    exit(-1);
 }
 
 // Each GPU is associated with its own context