用Pthreads进行共享内存编程----HelloWorld

1、编译gcc -g -Wall -o pth_hello pth_hello.c -lpthread2、运行./pth_hello <number of threads>例：运行4个线程，./pth_hello 43、源代码#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>int thread_count;void * Hello（void * rank）;int main（int argc, char * argv[]）
{
long thread;
pthread_t * thread_handles; thread_count = strtol（argv[1], NULL, 10）; thread_handles = malloc（thread_count * sizeof（pthread_t））; for（thread=0 ; thread<thread_count; thread++）
pthread_create（&thread_handles[thread], NULL, Hello, （void *）thread）; printf（"Hello from the main thread "）; for（thread=0; thread<thread_count; thread++）
pthread_join（thread_handles[thread], NULL）; free（thread_handles）;
return 0;
}void * Hello（void * rank）
{
long my_rank = （long）rank;
printf（"Hello from thread %ld of %d ", my_rank, thread_count）;
return NULL;
}