android 单例Singleton可否用于多进程？

[wangcong02345]

如题!
自己编了个demo程序
root@abc:/ # main_in
one.val = 100
root@abc:/ # main_out
one.val = 0
one.val = 200
singleton不是类似于全局变量吗？ 为什么同一个实例的两个val的值不一样？

cong@msi:/work/nv/git_r17/packages/test$ tree
t_in
Android.mk
main_in.cpp
oneExample.cpp
oneExample.h
t_out
Android.mk
main_out.cpp
代码如下：

cong@msi:/work/nv/git_r17/packages/test$ cat t_in/main_in.cpp 
#include  <stdio.h>
#include <stdlib.h>
#include  "oneExample.h"
using namespace android ;
int main ( int argc, char *argv[] )
{
    oneExample& one(oneExample::getInstance());
    one.val = 100;
    printf("one.val = %d \n", one.val);
    return EXIT_SUCCESS;
}

cong@msi:/work/nv/git_r17/packages/test$ cat t_in/oneExample.cpp 
#include    "oneExample.h"
namespace android {
    ANDROID_SINGLETON_STATIC_INSTANCE(oneExample)

oneExample::oneExample() {
}
oneExample::~oneExample() {

}
}

cong@msi:/work/nv/git_r17/packages/test$ cat t_in/oneExample.h 
#ifndef _ONE_EXAMPLE_H__
#define _ONE_EXAMPLE_H__
#include <utils/Singleton.h>
namespace android {
class oneExample: public Singleton<oneExample>
{
    friend class Singleton<oneExample>;
public:
    oneExample();
    ~oneExample();
    int val;
};
}
#endif

cong@msi:/work/nv/git_r17/packages/test$ cat t_in/Android.mk
LOCAL_PATH:= $(call my-dir)

include $(CLEAR_VARS)

LOCAL_SRC_FILES := \
	oneExample.cpp 

LOCAL_C_INCLUDES := 

LOCAL_MODULE := liboneExample

LOCAL_MODULE_TAGS := optional

include $(BUILD_SHARED_LIBRARY)


include $(CLEAR_VARS)

LOCAL_SRC_FILES := \
	oneExample.cpp \
	main_in.cpp
LOCAL_C_INCLUDES := 

LOCAL_SHARED_LIBRARIES := \
	libcutils \
	liblog \
	libc \
	liboneExample

LOCAL_MODULE := main_in

include $(BUILD_EXECUTABLE)

cong@msi:/work/nv/git_r17/packages/test$ cat t_out/main_out.cpp 
#include  <stdio.h>
#include <stdlib.h>
#include  "oneExample.h"
using namespace android ;
int main ( int argc, char *argv[] )
{
    oneExample& one(oneExample::getInstance());
    printf("one.val = %d \n", one.val);
    one.val = 200;
    printf("one.val = %d \n", one.val);
    return EXIT_SUCCESS;
}

cong@msi:/work/nv/git_r17/packages/test$ cat t_out/Android.mk 
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)

LOCAL_SRC_FILES := \
	main_out.cpp

LOCAL_C_INCLUDES := $(JNI_H_INCLUDE) \
		packages/test/t_in


LOCAL_SHARED_LIBRARIES := \
	libcutils \
	liblog \
	libc \
	liboneExample

LOCAL_MODULE := main_out

include $(BUILD_EXECUTABLE)