parallel for on pthreads initial commit

removing trailing whitespaces

Compilation error on Mac fix & warning on android

Warnings fixed on iOs

modules/core/src/parallel.cpp

@@ -125,6 +125,8 @@
 #  define CV_PARALLEL_FRAMEWORK "winrt-concurrency"
 #elif defined HAVE_CONCURRENCY
 #  define CV_PARALLEL_FRAMEWORK "ms-concurrency"
+#elif defined HAVE_PTHREADS
+#  define CV_PARALLEL_FRAMEWORK "pthreads"
 #endif
 
 namespace cv
@@ -298,6 +300,10 @@ void cv::parallel_for_(const cv::Range& range, const cv::ParallelLoopBody& body,
             Concurrency::CurrentScheduler::Detach();
         }
 
+#elif defined HAVE_PTHREADS
+        void parallel_for_pthreads(const Range& range, const ParallelLoopBody& body, double nstripes);
+        parallel_for_pthreads(range, body, nstripes);
+
 #else
 
 #error You have hacked and compiling with unsupported parallel framework
@@ -353,6 +359,12 @@ int cv::getNumThreads(void)
         ? Concurrency::CurrentScheduler::Get()->GetNumberOfVirtualProcessors()
         : pplScheduler->GetNumberOfVirtualProcessors());
 
+#elif defined HAVE_PTHREADS
+
+        size_t parallel_pthreads_get_threads_num();
+
+        return parallel_pthreads_get_threads_num();
+
 #else
 
     return 1;
@@ -410,6 +422,12 @@ void cv::setNumThreads( int threads )
                        Concurrency::MaxConcurrency, threads-1));
     }
 
+#elif defined HAVE_PTHREADS
+
+    void parallel_pthreads_set_threads_num(int num);
+
+    parallel_pthreads_set_threads_num(threads);
+
 #endif
 }