尽管尝试创建两个线程，但只创建一个线程

#include <pthread.h>
#include <stdio.h>
#include <unistd.h>
#include <vector>
#include <string>
#include <iostream>
FILE*            fp;
pthread_mutex_t demoMutex         = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t  conditionVariable = PTHREAD_COND_INITIALIZER;
unsigned int    condition         = 0;
struct serverInfo
{
    unsigned int serverId;
    pthread_t    threadId;
    std::vector<std::string> queue;
};
std::vector<serverInfo> serverInfoVector;
void* printHello(void* threadId)
{
    pthread_t* my_tid = (pthread_t*)threadId;
    pthread_mutex_lock(&demoMutex);
    while (condition == 0)
        pthread_cond_wait(&conditionVariable, &demoMutex);
    unsigned int i = 0;
    char found = false;
    if (serverInfoVector.size () > 0) {
       while ((i <= serverInfoVector.size()) && (found == false)) {
          if (*my_tid == serverInfoVector[i].threadId) {
             found = true;
             break;
          }
          else
             i++;
       }
    }
    while (!serverInfoVector[i].queue.empty()) {
       std::cout << "nThread: " << pthread_self() << ", poped from queue: " << serverInfoVector[i].queue.front();
       serverInfoVector[i].queue.pop_back();
    }
    pthread_mutex_unlock(&demoMutex);
    pthread_exit(NULL);
}
void checkServerExists(unsigned int serverNumber, std::string message)
{
    unsigned int i = 0;
    char found = false;
    pthread_mutex_lock(&demoMutex);
    if (serverInfoVector.size () > 0) {
       while ((i <= serverInfoVector.size()) && (found == false)) {
          if (serverNumber == serverInfoVector[i].serverId) {
             found = true;
             break;
          }
          else
             i++;
       }
    }
    if (found == false) {
       // This server doesn't exist, so create a thread for it, create a queue for it, push the message in the corresponding queue.
       // Push the server number in the serverNumberArray.
       // Create a thread for it.
       pthread_t newThread;
       int returnValue;
       if ((returnValue = pthread_create (&newThread, NULL, printHello, (void*) &newThread)) != 0) {
          printf("nerror: pthread_create failed with error number %d", returnValue);
       }
       printf("nIn checkServerExists()`: thread id %ldn", newThread);
       // Push the message in its queue.
       serverInfo obj;
       obj.serverId = serverNumber;
       obj.threadId = newThread;
       obj.queue.push_back(message);
       serverInfoVector.push_back(obj);
       condition++;
       pthread_cond_signal(&conditionVariable);
       pthread_mutex_unlock(&demoMutex);
       for (unsigned int i = 0; i < serverInfoVector.size(); i++)
          pthread_join(serverInfoVector[i].threadId, NULL);
    }
    else {
       // This server exists, so lookup its thread and queue, push the message in the corresponding queue.
       printf("nIn else ()`: thread id %ldn", serverInfoVector[i].threadId);
       serverInfoVector[i].queue.push_back(message);
       condition++;
       pthread_cond_signal(&conditionVariable);
       pthread_mutex_unlock(&demoMutex);
       for (unsigned int i = 0; i < serverInfoVector.size(); i++)
          pthread_join(serverInfoVector[i].threadId, NULL);
    }
}
int main()
{
   fp = fopen("xyz", "w");
   checkServerExists(1, "anisha");
   checkServerExists(2, "kaul");
   checkServerExists(1, "sanjeev");
   checkServerExists(2, "sharma");
}

输出：

In checkServerExists ()`: thread id 140233482061584
Thread: 140233482061584, poped from queue: anisha
In checkServerExists ()`: thread id 140233482061584
In else ()`: thread id 140233482061584
In else ()`: thread id 140233482061584

问题是似乎只创建了一个线程！我已经在main((中调用了该函数4 checkServerExists，使用不同的serverID调用了2次，所以应该创建两个线程吗？

我错过了什么？