Fixed tbb hang in Android apps

3rdparty/tbb/CMakeLists.txt

@@ -92,16 +92,16 @@ list(APPEND lib_srcs "${tbb_src_dir}/src/rml/client/rml_tbb.cpp")
 
 add_definitions(-D__TBB_DYNAMIC_LOAD_ENABLED=0         #required
                 -D__TBB_BUILD=1                        #required
-                -D__TBB_USE_GENERIC_DWORD_LOAD_STORE=1 #needed by TBB 4.0 update 1,2
-                -D__TBB_TASK_CPP_DIRECTLY_INCLUDED=1   #needed by TBB 4.0 update 3
+                -D__TBB_SURVIVE_THREAD_SWITCH=0        #no cilk on Android
+                -D__TBB_USE_GENERIC_DWORD_LOAD_STORE=1 #needed by TBB 4.0 update 1,2; fixed in TBB 4.0 update 3 but it has 2 new problems
+                -DUSE_PTHREAD                          #required
                 -DTBB_USE_GCC_BUILTINS=1               #required
                 -DTBB_USE_DEBUG=0                      #just ot be sure
                 -DTBB_NO_LEGACY=1                      #don't need backward compatibility
-                -DUSE_PTHREAD                          #required
                 -DDO_ITT_NOTIFY=0                      #it seems that we don't need these notifications
                )
 
-add_library(tbb STATIC ${lib_srcs} ${lib_hdrs})
+add_library(tbb STATIC ${lib_srcs} ${lib_hdrs} "${CMAKE_CURRENT_SOURCE_DIR}/android_additional.h" "${CMAKE_CURRENT_SOURCE_DIR}/version_string.tmp")
 target_link_libraries(tbb c m dl)
 
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -w -include \"${CMAKE_CURRENT_SOURCE_DIR}/android_additional.h\"")

3rdparty/tbb/android_additional.h

@@ -1,27 +1,41 @@
-#include <sys/syscall.h>
-#include <pthread.h>
+#include <cstdio>
 
-typedef unsigned long cpu_set_t;
-#define __NCPUBITS      (8 * sizeof (unsigned long))
-
-
-#define CPU_SET(cpu, cpusetp) \
-	        ((*(cpusetp)) |= (1UL << ((cpu) % __NCPUBITS)))
-
-#define CPU_ISSET(cpu, cpusetp) \
-	        ((*(cpusetp)) & (1UL << ((cpu) % __NCPUBITS)))
-
-#define CPU_ZERO(cpusetp) \
-	        memset((cpusetp), 0, sizeof(cpu_set_t))
-
-inline static int
-sched_setaffinity(pid_t pid, size_t len, cpu_set_t const * cpusetp)
+static inline int getPossibleCPUs()
 {
-	return syscall(__NR_sched_setaffinity, pid, len, cpusetp);
+   FILE* cpuPossible = fopen("/sys/devices/system/cpu/possible", "r");
+   if(!cpuPossible)
+       return 1;
+
+   char buf[2000]; //big enough for 1000 CPUs in worst possible configuration
+   char* pbuf = fgets(buf, sizeof(buf), cpuPossible);
+   fclose(cpuPossible);
+   if(!pbuf)
+      return 1;
+
+   //parse string of form "0-1,3,5-7,10,13-15"
+   int cpusAvailable = 0;
+
+   while(*pbuf)
+   {
+      const char* pos = pbuf;
+      bool range = false;
+      while(*pbuf && *pbuf != ',')
+      {
+          if(*pbuf == '-') range = true;
+          ++pbuf;
+      }
+      if(*pbuf) *pbuf++ = 0;
+      if(!range)
+        ++cpusAvailable;
+      else
+      {
+          int rstart = 0, rend = 0;
+          sscanf(pos, "%d-%d", &rstart, &rend);
+          cpusAvailable += rend - rstart + 1;
       }
       
-inline static int
-sched_getaffinity(pid_t pid, size_t len, cpu_set_t const * cpusetp)
-{
-	return syscall(__NR_sched_getaffinity, pid, len, cpusetp);
    }
+   return cpusAvailable ? cpusAvailable : 1;
+}
+
+#define __TBB_HardwareConcurrency() getPossibleCPUs()

cmake/OpenCVCompilerOptions.cmake

@@ -108,7 +108,7 @@ if(CMAKE_COMPILER_IS_GNUCXX)
     # Profiling?
     if(ENABLE_PROFILING)
         set(OPENCV_EXTRA_C_FLAGS_RELEASE "${OPENCV_EXTRA_C_FLAGS_RELEASE} -pg -g")
-    elseif(NOT APPLE)
+    elseif(NOT APPLE AND NOT ANDROID)
         # Remove unreferenced functions: function level linking
         set(OPENCV_EXTRA_C_FLAGS "${OPENCV_EXTRA_C_FLAGS} -ffunction-sections")
     endif()