c-简单多线程（委托模型）
委托模型，即有一个BOSS线程，就是主线程，产生woker线程，boss线程和worker线程并发执行。
BOSS线程的主要任务是创建worker线程，将工作线程放入队列中，当有工作可处理时，唤醒 工作线程。
/* Create a new thread, starting with execution of START-ROUTINE getting passed ARG. Creation attributed come from ATTR. The new handle is stored in *NEWTHREAD. */
extern int pthread_create (pthread_t *__restrict __newthread,
__const pthread_attr_t *__restrict __attr,
void *(*__start_routine) (void *),
void *__restrict __arg) __THROW __nonnull ((1, 3));
/* Obtain the identifier of the current thread. */
extern pthread_t pthread_self (void) __THROW __attribute__ ((__const__));
//返回调用该函数的当前线程的pthread_t结构指针
/* Make calling thread wait for termination of the thread TH. The
exit status of the thread is stored in *THREAD_RETURN, if THREAD_RETURN
is not NULL.
This function is a cancellation point and therefore not marked with
__THROW. */
extern int pthread_join (pthread_t __th, void **__thread_return);//__thread_return退出状态
//pthread_join导致调用线程挂起它的执行，直到目标线程的结束。
main.c
#include <pthread.h>
#include <stdio.h>
//2个工作线程，分别是累加和累乘
void *mycompadd(void *xx){//参数必须为void *，然后进行强制类型转换
int sum=0;
int *x=(int *)(xx);
for (int i=0;i<*x;i++){
sum+=i;
}
printf("add%d\n",sum);
}
void *mycompchen(void *xx){//参数必须为void *，然后进行强制类型转换
int sum=1;
int *x=(int *)(xx);
for (int i=1;i<=*x;i++){
sum*=i;
}
printf("chen%d\n",sum);
}
int main(){
//main为boss线程，
pthread_t threada,threadb;
//创建worker线程，并执行线程
int n=3;
pthread_create(&threada,NULL,mycompadd,&n);//线程，线程属性，函数，参数。如果有多个参数，必须传结构指针
pthread_create(&threadb,NULL,mycompchen,&n);//线程，线程属性，函数，参数
//wait worker线程，并合并到BOSS线程来
pthread_join(threada,NULL);
pthread_join(threadb,NULL);
return(0);
}
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