我试图编译这个简单程序与android-ndk-r8b
:
JNI/hello_jni.cpp如何在Android NDK中使用C++ 0x线程?
#include <iostream>
#include <thread>
void hello()
{
std::cout << "Hi i'm a thread!!!" << std::endl;
}
int main()
{
std::thread th(hello);
th.join();
return 0;
}
JNI/Application.mk
APP_OPTIM := release
APP_MODULES := hello_thread
APP_STL := gnustl_static
JNI/Android.mk
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_CPPFLAGS += -std=c++0x -frtti
LOCAL_MODULE := hello_thread
LOCAL_LDLIBS := -L$(SYSROOT)/usr/lib -pthread
LOCAL_SRC_FILES := hello_thread.cpp
include $(BUILD_EXECUTABLE)
ndk-build给我一个错误,认为'线索'不是'std'的成员。 我发出NDK,建立-n使编译命令,并在我的壳单独发出它:
/home/evigier/android-ndk-r8b/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/arm-linux-androideabi-g++ -MMD -MP -MF /home/evigier/eclipse_workspace/hello_thread/obj/local/armeabi/objs/hello_thread/hello_thread.o.d -fpic -ffunction-sections -funwind-tables -fstack-protector -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__ -march=armv5te -mtune=xscale -msoft-float -fno-exceptions -fno-rtti -mthumb -Os -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64 -I/home/evigier/android-ndk-r8b/sources/cxx-stl/gnu-libstdc++/4.6/include -I/home/evigier/android-ndk-r8b/sources/cxx-stl/gnu-libstdc++/4.6/libs/armeabi/include -I/home/evigier/eclipse_workspace/hello_thread/jni -DANDROID -Wa,--noexecstack -std=c++0x -frtti -O2 -DNDEBUG -g -I/home/evigier/android-ndk-r8b/platforms/android-14/arch-arm/usr/include -c /home/evigier/eclipse_workspace/hello_thread/jni/hello_thread.cpp -o /home/evigier/eclipse_workspace/hello_thread/obj/local/armeabi/objs/hello_thread/hello_thread.o
Compile++ thumb : hello_thread <= hello_thread.cpp
In file included from /home/evigier/android-ndk-r8b/platforms/android-14/arch-arm/usr/include/stdio.h:55:0,
from /home/evigier/android-ndk-r8b/platforms/android-14/arch-arm/usr/include/wchar.h:33,
from /home/evigier/android-ndk-r8b/sources/cxx-stl/gnu-libstdc++/4.6/include/cwchar:46,
from /home/evigier/android-ndk-r8b/sources/cxx-stl/gnu-libstdc++/4.6/include/bits/postypes.h:42,
from /home/evigier/android-ndk-r8b/sources/cxx-stl/gnu-libstdc++/4.6/include/iosfwd:42,
from /home/evigier/android-ndk-r8b/sources/cxx-stl/gnu-libstdc++/4.6/include/ios:39,
from /home/evigier/android-ndk-r8b/sources/cxx-stl/gnu-libstdc++/4.6/include/ostream:40,
from /home/evigier/android-ndk-r8b/sources/cxx-stl/gnu-libstdc++/4.6/include/iostream:40,
from jni/hello_thread.cpp:4:
/home/evigier/android-ndk-r8b/platforms/android-14/arch-arm/usr/include/sys/types.h:124:9: error: 'uint64_t' does not name a type
/home/evigier/eclipse_workspace/hello_thread/jni/hello_thread.cpp: In function 'int main()':
/home/evigier/eclipse_workspace/hello_thread/jni/hello_thread.cpp:14:5: error: 'thread' is not a member of 'std'
/home/evigier/eclipse_workspace/hello_thread/jni/hello_thread.cpp:14:17: error: expected ';' before 'th'
/home/evigier/eclipse_workspace/hello_thread/jni/hello_thread.cpp:15:5: error: 'th' was not declared in this scope
我读了很多关于POSIX线程和C++线程的线程/问题,但仍无法找到我回答。我arm-linux-androideabi/include/c++/4.6/thread
文件中只std
定义class thread
:
#if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
他们似乎并不在我的SDK被定义(C++的config.h)。但是我怎么能安全地把它们打开?我是否需要编译自己的工具链才能使用(非-p)线程?我的主机是:
Linux evigier-ThinkPad-X220 3.0.0-17-generiC#30-Ubuntu SMP Thu Mar 8 20:45:39 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
谢谢谢尔盖。那么为什么android系统会在NDK中包含include/C++/4.6/thread头文件呢?如何在没有的情况下在android中使用NDK来执行一些多线程内容?你使用POSIX线程吗? –
2012-07-31 13:27:23
我在Android中使用POSIX线程。他们工作得很好。我不知道4.6工具链中的新标题。 – 2012-07-31 13:31:14
好的谢谢。 @ commoncpp @提供了类Thread,我会试试这个。 – 2012-07-31 13:45:12