JavaNative 使用C多线程库的问题
Java类文件package com.fangzhaoguo.primefinder;public class NativeConcurrentPrimeFinder {
static {
System.loadLibrary("libJavaNative_ConcurrentPrimeFinder");
}
public NativeConcurrentPrimeFinder() {
}
public native boolean isPrime(final long number);
public native int countPrime(final long number);
public native int countPrime(final long lower, final long upper);
}
javah后的C头文件，并且经过我的修改，加入了自定义的变量、数据结构以及函数/* DO NOT EDIT THIS FILE - it is machine generated */
#include "jni.h"
#include <pthread.h>
#include <stdio.h>
#include <malloc.h>
#include <math.h>
/* Header for class com_fangzhaoguo_primefinder_NativeConcurrentPrimeFinder */
jint total = 0;
typedef struct {
JNIEnv *env;
jobject obj;
jlong lower;
jlong upper;
} Message;
#ifndef _Included_com_fangzhaoguo_primefinder_NativeConcurrentPrimeFinder
#define _Included_com_fangzhaoguo_primefinder_NativeConcurrentPrimeFinder
#ifdef __cplusplus
extern "C" {
#endif
/*
* Class: com_fangzhaoguo_primefinder_NativeConcurrentPrimeFinder
* Method: isPrime
* Signature: (J)Z
*/
JNIEXPORT jboolean JNICALL Java_com_fangzhaoguo_primefinder_NativeConcurrentPrimeFinder_isPrime(
JNIEnv *, jobject, jlong);
/*
* Class: com_fangzhaoguo_primefinder_NativeConcurrentPrimeFinder
* Method: countPrime
* Signature: (J)I
*/
JNIEXPORT jint JNICALL Java_com_fangzhaoguo_primefinder_NativeConcurrentPrimeFinder_countPrime__J(
JNIEnv *, jobject, jlong);
/*
* Class: com_fangzhaoguo_primefinder_NativeConcurrentPrimeFinder
* Method: countPrime
* Signature: (JJ)I
*/
JNIEXPORT jint JNICALL Java_com_fangzhaoguo_primefinder_NativeConcurrentPrimeFinder_countPrime__JJ(
JNIEnv *, jobject, jlong, jlong);
void *countPrimeInRange(void* mess);
#ifdef __cplusplus
}
#endif
#endif
Mingw编译的C文件 ，使用了pthread头文件，并且在链接时使用了pthread，编译正常
线程调用时通过message来传递JavaNative特有的参数
/*
* com_fangzhaoguo_primefinder_NativeConcurrentPrimeFinder.c
*
*Created on: 2013年7月18日
* Author: root
*/
#include "com_fangzhaoguo_primefinder_NativeConcurrentPrimeFinder.h"
JNIEXPORT jboolean JNICALL Java_com_fangzhaoguo_primefinder_NativePrimeFinder_isPrime(
JNIEnv *env, jobject obj, jlong number) {
jlong i = 0;
if (1 >= number) {
return 0;
}
for (i = 2; i <= sqrt(number); i++) {
if (0 == number % i) {
return 0;
}
}
return 1;
}
void *countPrimeInRange(void* mess) {
jlong i = 0;
Message* message = (Message*) mess;
for (i = message->lower; i < message->upper; i++) {
if (Java_com_fangzhaoguo_primefinder_NativePrimeFinder_isPrime(
message->env, message->obj, i)) {
total++;
}
}
return NULL;
}
JNIEXPORT jint JNICALL Java_com_fangzhaoguo_primefinder_NativePrimeFinder_countPrime__J(
JNIEnv *env, jobject obj, jlong number) {
pthread_t thread;
Message* message = (Message*) malloc(sizeof(Message));
message->env = env;
message->obj = obj;
jlong start = 0, end = 0;
jlong range = number / 4;
jint i = 0;
for (i = 0; i < 4; i++) {
start = 0 + range * i;
if (i < 3) {
end = start + range;
} else {
end = number;
}
message->lower = start;
message->upper = end;
pthread_create(&thread, NULL, countPrimeInRange, (void*) message);
}
return total;
}
JNIEXPORT jint JNICALL Java_com_fangzhaoguo_primefinder_NativePrimeFinder_countPrime__JJ(
JNIEnv *env, jobject obj, jlong lower, jlong upper) {
jlong i = 0;
for (i = lower; i < upper; i++) {
if (Java_com_fangzhaoguo_primefinder_NativePrimeFinder_isPrime(env, obj,
i)) {
total++;
}
}
return total;
}
但是现在的问题是在java中运行时报错，不管使用C写还是加载boost类的C++写，都报相同的错误。有不使用C/C++多线程的例子，可以正常使用
以下是报错内容Exception in thread "main" java.lang.UnsatisfiedLinkError: com.fangzhaoguo.primefinder.NativeConcurrentPrimeFinder.countPrime(J)I
at com.fangzhaoguo.primefinder.NativeConcurrentPrimeFinder.countPrime(Native Method)
at com.fangzhaoguo.primefinder.Main.timeAndCompute(Main.java:58)
at com.fangzhaoguo.primefinder.Main.main(Main.java:6)
看看是不是编译的原因，strings看一下你的函数名的符号有没有多个@符号，如果有的话，改一下编译参数 使用nm看吗？有下划线数量的变化，没有发现@
不过boost版的问题多些
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