ubuntu18.04 使用pthread库

不需要安装包，但是编译的时候需要手动包含pthread包：g++ threadtest1.cpp -lpthread -o threadtest1

测试代码：

#include <pthread.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
//#include <unistd.h>
#define NUM_THREADS 20

//thread argument struct
typedef struct _thread_data {
int tid;
double studff;
} thread_data;

//thread function
void* thr_func(void* arg) {
thread_data* data = (thread_data*)arg;

printf("from thr_func, thread id:%d ", data->tid);

pthread_exit(NULL);
return NULL;
}

int main() {
pthread_t thr[NUM_THREADS];
int i, rc;

//thread_data argument array
thread_data thr_data[NUM_THREADS];

//initialize and set thread datached
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
//create threads
for (i = 0; i < NUM_THREADS; ++i) {
thr_data[i].tid = i;
if ((rc = pthread_create(&thr[i], &attr, thr_func, &thr_data[i]))) {
fprintf(stderr, "error:pthread_create,rc: %d ", rc);
return EXIT_FAILURE;
}
}

pthread_attr_destroy(&attr);

while (1) {}
return 0;
}