我正在尝试解决哲学家进餐问题。所以我几乎编写了整个代码，但问题是我无法初始化监视器（我已经制作了我用 C++ 重写的伪代码）所以我真的无法测试程序. 谁能帮我说说 monitor/mutex_init 的初始化有什么问题？
我在第 18 行收到错误，它类似于：错误：'int pthread_mutex_init' redeclared as different kind of symbol
将其更改为 int pthread_mutex_init(&monitor,NULL); 不行！
通过添加 int pthread_mutex_init(pthread_mutex_t *monitor, NULL);
我收到错误：“__null”之前的预期标识符</p>
#include <iostream>
#include <cstdio>
#include <pthread.h>
#include <cstdlib>
#include <unistd.h>
using namespace std;
char v_filozofi[5]={'O'}; //vizualni prikaz filozofa
int stapic[5]={1}; //stapici za filozofe
int broj[5]; //shema koju sam mora sloziti da imam broj filozofa
pthread_t d_filozofi[5]; //dretve filozofa,philosopher's thread
pthread_cond_t red_uvjeta[5];
pthread_mutex_t monitor; //deklariramo monitor,tj mymutex
int pthread_mutex_init(*monitor,NULL);
void ispisi_stanje(int n){
for(int i = 0; i < 5 ;i++) cout<< v_filozofi[i];
cout<<"("<< n+1 << ")" <<endl;
}
void misliti(int n){
cout<<"Mislim " << endl;
sleep(4);
}
void jesti(int n){
pthread_mutex_lock(&monitor);
v_filozofi[n]='o';
while(stapic[n]==0 || stapic[n+1]%5==0){//gleda ima li lijevi i desni
//stapic na raspolaganju
pthread_cond_wait(&red_uvjeta[n],&monitor);
}
stapic[n] = stapic[(n+1)%5] = 0;
v_filozofi[n] = 'X';
ispisi_stanje(n);
pthread_mutex_unlock(&monitor);
sleep(2);
pthread_mutex_lock(&monitor);
v_filozofi[n] = 'O';
stapic[n] = stapic[(n+1)%5] = 1;
pthread_cond_signal(&red_uvjeta[(n-1)%5]);
pthread_cond_signal(&red_uvjeta[(n+1)%5]);
ispisi_stanje(n);
pthread_mutex_unlock(&monitor);
}
void * filozof(void *n){
int br_fil = *((int *)n);
while(1){
misliti(br_fil);
jesti(br_fil);
}
return 0;
}
//MAIN
int main(){
for(int i=0;i<5;i++){
broj[i] = i;
pthread_cond_init(&red_uvjeta[i],NULL);
}
for(int i=0;i<5;i++){
sleep(1);
pthread_create( &d_filozofi[i],NULL,filozof,&broj[i]);
}
for(int i=0;i<5;i++) pthread_join(d_filozofi[i],NULL);
pthread_mutex_destroy(&monitor);
return 0;
}