use threadpool on C API

android/.cxx/cmake/debug/arm64-v8a/rules.ninja

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+# CMAKE generated file: DO NOT EDIT!
+# Generated by "Ninja" Generator, CMake Version 3.10
+
+# This file contains all the rules used to get the outputs files
+# built from the input files.
+# It is included in the main 'build.ninja'.
+
+# =============================================================================
+# Project: Project
+# Configuration: Debug
+# =============================================================================
+# =============================================================================
+
+#############################################
+# Rule for running custom commands.
+
+rule CUSTOM_COMMAND
+  command = $COMMAND
+  description = $DESC
+
+
+#############################################
+# Rule for compiling CXX files.
+
+rule CXX_COMPILER__filament_interop
+  depfile = $DEP_FILE
+  deps = gcc
+  command = /home/hydroxide/Android/Sdk/ndk/23.1.7779620/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ --target=aarch64-none-linux-android21 --gcc-toolchain=/home/hydroxide/Android/Sdk/ndk/23.1.7779620/toolchains/llvm/prebuilt/linux-x86_64 --sysroot=/home/hydroxide/Android/Sdk/ndk/23.1.7779620/toolchains/llvm/prebuilt/linux-x86_64/sysroot  $DEFINES $INCLUDES $FLAGS -MD -MT $out -MF $DEP_FILE -o $out -c $in
+  description = Building CXX object $out
+
+
+#############################################
+# Rule for linking CXX shared library.
+
+rule CXX_SHARED_LIBRARY_LINKER__filament_interop
+  command = $PRE_LINK && /home/hydroxide/Android/Sdk/ndk/23.1.7779620/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ --target=aarch64-none-linux-android21 --gcc-toolchain=/home/hydroxide/Android/Sdk/ndk/23.1.7779620/toolchains/llvm/prebuilt/linux-x86_64 --sysroot=/home/hydroxide/Android/Sdk/ndk/23.1.7779620/toolchains/llvm/prebuilt/linux-x86_64/sysroot -fPIC $LANGUAGE_COMPILE_FLAGS $ARCH_FLAGS $LINK_FLAGS -shared $SONAME_FLAG$SONAME -o $TARGET_FILE $in $LINK_PATH $LINK_LIBRARIES && $POST_BUILD
+  description = Linking CXX shared library $TARGET_FILE
+  restat = $RESTAT
+
+
+#############################################
+# Rule for re-running cmake.
+
+rule RERUN_CMAKE
+  command = /mnt/hdd_2tb/Android/Sdk/cmake/3.10.2.4988404/bin/cmake -H/mnt/hdd_2tb/home/hydroxide/projects/polyvox/polyvox_filament/android -B/mnt/hdd_2tb/home/hydroxide/projects/polyvox/polyvox_filament/android/.cxx/cmake/debug/arm64-v8a
+  description = Re-running CMake...
+  generator = 1
+
+
+#############################################
+# Rule for cleaning all built files.
+
+rule CLEAN
+  command = /home/hydroxide/Android/Sdk/cmake/3.10.2.4988404/bin/ninja -t clean
+  description = Cleaning all built files...
+
+
+#############################################
+# Rule for printing all primary targets available.
+
+rule HELP
+  command = /home/hydroxide/Android/Sdk/cmake/3.10.2.4988404/bin/ninja -t targets
+  description = All primary targets available:
+