如何使用c ++ 0x线程在Android NDK？ [英] How to use c++0x thread in Android NDK?
问题描述
我试图用 android-ndk-r8b 编译这个简单的程序：
jni / hello_jni.cpp
#include< iostream>
#include< thread>
void hello（）
{
std :: cout< 你好我是一个线程!!! << 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目录-pthread
LOCAL_SRC_FILES：= hello_thread.cpp
$包括（BUILD_EXECUTABLE）
ndk-build 返回一个错误，认为'thread'不是成员的'std'。
我发出 ndk-build -n 以获得编译命令并在我的shell中单独发出：/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 /本地/ armeabi / OBJ文件/ hello_thread / hello_thread.od -fpic -ffunction截面-funwind桌-fstack保护器-D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__ -march =的ARMv5TE -mtune =的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-的libstdc ++ / 4.6 /包括-I /家庭/ evigier / Android的NDK-R8B /来源/ CXX-STL / GNU-的libstdc ++ / 4.6 /库/ armeabi /包括-I /家庭/ 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
++编译大拇指：hello_thread< = hello_thread.cpp
在/home/evigier/android-ndk-r8b/platforms/android-14/arch-arm/usr/include/stdio.h:55:0中包含的文件中，
从/home/evigier/android-ndk-r8b/platforms/android-14/arch-arm/usr/include/wchar.h:33，
来自/ home / evigier / android-ndk-r8b / sources / cxx -stl / gnu-libstdc ++ / 4.6 / include / cwchar：46，
从/home/evigier/android-ndk-r8b/sources/cxx-stl/gnu-libstdc++/4.6/include/bits/postypes.h ：42，
从/home/evigier/android-ndk-r8b/sources/cxx-stl/gnu-libstdc++/4.6/include/iosfwd:42，从/家/ evigier / Android的NDK
-r8b / sources / cxx-stl / gnu-libstdc ++ / 4.6 / include / ios：39，
来自/home/evigier/android-ndk-r8b/sources/cxx-stl/gnu-libstdc++/4.6/include / ostream的：40，从/home/evigier/android-ndk-r8b/sources/cxx-stl/gnu-libstdc++/4.6/include/iostream:40
，从JNI / hello_thread.cpp
： 4：
/home/evigier/android-ndk-r8b/platforms/android-14/arch-man/usr/include/sys/types.h:124:9：错误：'uint64_t'不命名类型
/home/evigier/eclipse_workspace/hello_thread/jni/hello_thread.cpp：在函数'廉政的main（）'：
/home/evigier/eclipse_workspace/hello_thread/jni/hello_thread.cpp:14： 5：错误：'thread'不是'std'的成员
/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：错误：'th'未在此范围中声明
我读了很多关于POSIX线程和C ++线程的线程/问题，但仍然找不到我的答案。我的
arm-linux-androideabi / include / c ++ / 4.6 / thread文件定义类线程> std only：#if defined（_GLIBCXX_HAS_GTHREADS）&&定义（_GLIBCXX_USE_C99_STDINT_TR1）
它们似乎没有在我的sdk H）。但我怎么可能安全地把他们？我需要编译自己的工具链使用（非P）线程吗？我的主机是：
Linux evigier- ThinkPad X220 3.0.0-17-通用＃30- Ubuntu SMP 3月8日20:45:39 UTC 2012 x86_64 x86_64 x86_64 GNU / Linux
解决方案p> Android NDK r8b自带gcc 4.6，不包含任何C ++ 11线程的实现。你必须提供自己的实现，并可能建立自己独立的gcc工具
检查这些网页中的gcc C ++ 11的支持：
- http://gcc.gnu.org/projects/ cxx0x.html
- http://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.200x
POSIX线程是一个完全不同的故事，你可以在Android NDK中使用它们。您将需要至少
pthread_create（），pthread_detach（）和pthread_join code>调用。I am trying to compile this simple program with
android-ndk-r8b:
jni/hello_jni.cpp#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_staticjni/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 returns me an error arguin that 'thread' is not a member of 'std'. I issued ndk-build -n to get the compilation command and issued it alone in my shell:
/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 scopeI read a lot of threads/questions about POSIX threads and C++ threads, but still cannot find my answer. My
arm-linux-androideabi/include/c++/4.6/threadfile definesclass threadinstdonly:#if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)They don't seem to be defined in my sdk (c++config.h). But how can I possibly turn them on safely? Do i need to compile my own toolchain to use (non-p)threads? My host computer is :
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
解决方案Android NDK r8b comes with gcc 4.6 and does not contain any implementation of C++11 threads. You will have to provide your own implementations and possibly build your own standalone gcc toolchain.
Check these pages for C++11 support in gcc:
- http://gcc.gnu.org/projects/cxx0x.html
- http://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.200x
POSIX threads is a completely different story and you can use them in Android NDK. You will need at least
pthread_create(),pthread_detach()andpthread_join()calls to do it.这篇关于如何使用c ++ 0x线程在Android NDK？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
