pthread_create在构造函数段错误中

我发现，在下面的这个小例子中，如果我在结构的构造函数中调用pthread_create，我在调用 pthread_mutex_lock(( 时会随机得到一个段错误。

有时，对于第一位哲学家来说，名字字段是空的。

如果我pthread_create构造函数之后移动到 run(( 函数，则没有段错误。

似乎对所有成员初始化之前都会调用pthread_create。 类的成员初始化列表不应该在调用构造函数体之前完成吗？

感谢您的任何提示！

CLANG 版本 9.0.0 (标签/RELEASE_900/最终版( 目标：x86_64-苹果-达尔文17.7.0

真诚的，乔治

#include <array>
#include <iostream>
#include <pthread.h>
#include <string>
#include <vector>
using namespace std;

struct chopstick
{
pthread_mutex_t mutex;
chopstick()
{
pthread_mutex_init(&mutex,nullptr);
}
~chopstick()
{
pthread_mutex_destroy(&mutex);
}
};
void* feed(void* data);
struct philosopher
{
pthread_t thread;
string name;
unsigned mouthfuls;
chrono::seconds sec;
chopstick &left, &right;
pthread_t& get_thread() { return thread; }
philosopher(const string &s, chopstick &l, chopstick &r): name(move(s)), left(l), right(r), mouthfuls(0)
/*
enable below to avoid segfault
{}
void run()  
*/
{
pthread_create(&thread, nullptr, feed, this);
};
};
void* feed(void* data)
{
philosopher & a = *static_cast<philosopher*>(data);
while (a.mouthfuls < 20)
{
pthread_mutex_lock(&a.left.mutex);
pthread_mutex_lock(&a.right.mutex);
cout << "Apostle " << a.name << " thread id " << pthread_self() 
<< " acquired a chopstick at count: " << a.mouthfuls << endl;
++a.mouthfuls;
pthread_mutex_unlock(&a.right.mutex);
pthread_mutex_unlock(&a.left.mutex);
}
return nullptr;
}
int main (int argc, char const * argv[])
{
array<string, 12> names {"John", "Thaddeus", "Simon Peter", "James", "Judhas", "Bartholomew", "Matthew", "Philip", "Simon Zealot", "Thomas", "Andrew", "James the Lesser" };
array<chopstick,names.size()> sticks;
vector<philosopher> philosophers;
for (int i=0; i+1<names.size(); ++i)
philosophers.emplace_back( names[i],sticks[i],sticks[i+1] );
philosophers.emplace_back(names[names.size()-1], sticks[0],sticks[names.size()-1]);
//for (philosopher&  a: philosophers) a.run();  //<-- enable to avoid segfault
for (philosopher&  a: philosophers) pthread_join(a.get_thread(), nullptr);
return 0;
}