- 论坛徽章:
- 0
|
http://forum.ubuntu.org.cn/viewtopic.php?t=87963&sid=261ef286c2534e841396c66f7f40022c
今天早上看信号锁时,出现问题, google一把,搜出上面的帖子,楼主估计是在编译该UNIX网络编程 2 的时候出现了问题, 而且不知道怎么解决,看了一下的头文件
#ifdef __USE_UNIX98
/* Determine level of concurrency. */
extern int pthread_getconcurrency (void) __THROW;
/* Set new concurrency level to LEVEL. */
extern int pthread_setconcurrency (int __level) __THROW;
#endif
估计楼主并没有看所以出现了该问题,而且最后也没有回复搞定的帖子,不管怎样,楼主肯定郁闷了好一阵子^_^,不过还好,小学语文课本就已经教育过我们说,做事情要有耐心,^_^,希望那位楼主解决了那个问题。下面是我编译通过的源码:
#define __USE_UNXI98
#include /* basic system data types */
#include /* timeval{} for select() */
#include /* timespec{} for pselect() */
#include
#include /* for nonblocking */
#include /* PIPE_BUF */
#include
#include
#include
#include
#include /* for S_xxx file mode constants */
#include
#include
#include
#define MAXNITEMS 1000000
#define MAXNTHREADS 100
#define min(a,b) ((a)
int nitems; /* read-only by producer and consumer */
struct {
pthread_mutex_t mutex;
int buff[MAXNITEMS];
int nput;
int nval;
} shared = { PTHREAD_MUTEX_INITIALIZER };
void *produce(void *), *consume(void *);
int
main(int argc, char **argv)
{
int i, nthreads, count[MAXNTHREADS];
pthread_t tid_produce[MAXNTHREADS], tid_consume;
if (argc != 3)
{
printf("usage: prodcons2 ");
exit(0);
}
nitems = min(atoi(argv[1]), MAXNITEMS);
nthreads = min(atoi(argv[2]), MAXNTHREADS);
pthread_setconcurrency(nthreads);
/* 4start all the producer threads */
for (i = 0; i
/* 4wait for all the producer threads */
for (i = 0; i
/* 4start, then wait for the consumer thread */
pthread_create(&tid_consume, NULL, consume, NULL);
pthread_join(tid_consume, NULL);
exit(0);
}
/* end main */
/* include producer */
void *
produce(void *arg)
{
for ( ; ; ) {
pthread_mutex_lock(&shared.mutex);
if (shared.nput >= nitems) {
pthread_mutex_unlock(&shared.mutex);
return(NULL); /* array is full, we're done */
}
shared.buff[shared.nput] = shared.nval;
shared.nput++;
shared.nval++;
pthread_mutex_unlock(&shared.mutex);
*((int *) arg) += 1;
}
}
void *
consume(void *arg)
{
int i;
for (i = 0; i
当然这个在编译的时候也是有一些问题的,建议另存为prodcons2.c
编译时命令:cc prodcons2.c -lpthread
其中 -lpthread 是参数,一定要添加,要不然就会出现错误,原因?我也没有明白。。。。sorry!
./a.out 1000000 5
可以通过编译,并运行,网上搜索是有好处的,因为在时间不够的情况下,可以让你更好的选择学习的重点,正如帖子里面所说, system V才是现在的主流,所以,切换先。^_^,看system V信号灯。以后回过头来看这一章吧。
本文来自ChinaUnix博客,如果查看原文请点:http://blog.chinaunix.net/u2/83146/showart_1336300.html |
|