我尝试使用OpenAl编写Beep函数。但是只能运行该函数的几个线程。一段时间后，以下代码失败：
package test;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.Socket;
public class Client {
public Client() {
// TODO Auto-generated constructor stub
}
public static void main(String args[]) throws Exception
{
System.out.println("Client started");
Socket sk=new Socket("localhost",8888);
System.out.println("Client Connected");
BufferedReader sin=new BufferedReader(new InputStreamReader(sk.getInputStream()));
PrintStream sout=new PrintStream(sk.getOutputStream());
BufferedReader stdin=new BufferedReader(new InputStreamReader(System.in));
String s;
while ( true )
{
System.out.print("Client : ");
s=stdin.readLine();
sout.println(s);
s=sin.readLine();
System.out.print("Server : "+s+"\n");
if ( s.equalsIgnoreCase("BYE") )
break;
}
sk.close();
sin.close();
sout.close();
stdin.close();
}
}
#include <cmath>
#include <iostream>
#include <thread>
using namespace std;
#include <AL/alut.h> // OpenAl
void init_al()
{
const char *defname = alcGetString(NULL, ALC_DEFAULT_DEVICE_SPECIFIER);
ALCdevice* dev = alcOpenDevice(defname);
ALCcontext *ctx = alcCreateContext(dev, NULL);
alcMakeContextCurrent(ctx);
}
void exit_al()
{
ALCcontext* ctx = alcGetCurrentContext();
ALCdevice* dev = alcGetContextsDevice(ctx);
alcMakeContextCurrent(0);
alcDestroyContext(ctx);
alcCloseDevice(dev);
}
void Beep(float freq = 440, float seconds = 0.5)
{
init_al();
ALuint buf;
alGenBuffers(1, &buf);
unsigned sample_rate = 10000;
size_t buf_size = seconds * sample_rate;
short* samples = new short[buf_size];
if(samples == 0)
{
cout<< "It seems there is no more heap memory. Sorry we cannot make a beep!";
}
for(unsigned i = 0; i < buf_size; i++)
samples[i] = 32760*sin(2*M_PI*i*freq/sample_rate);
alBufferData(buf,AL_FORMAT_MONO16,samples,buf_size,sample_rate);
ALuint src;
alGenSources(1,&src);
alSourcei(src,AL_BUFFER,buf);
alSourcePlay(src);
alutSleep(seconds + 0.5);
delete[] samples;
exit_al();
}
int main()
{
for(int i = 1; i < 1000; i++)
{
thread t(Beep, 440,0.5);
t.detach();
alutSleep(0.01);
}
}
功能出了什么问题？我该如何解决？
我在发生问题的正常程序中使用了此Beep函数。我在上面的程序中重现了错误。问题是Beep在一段时间后变得没有响应，即使你不管它几秒钟来完成它以前的任务。所以它使用了一些东西，并没有返回它。如果更改1000到20没有任何更改。