Pithikos
My variables is not change
the problem is that I defined a struct to store the variable i changed in a foop loop, but after I added all works, then I use function thpool_wait() to wait the work done, but the result is not as expected, the result should be a list of numbers from 0-99, maybe the sequence is variant, but the result of mine is always 99, hope your help,thanks the code `#include "thpool.h"
struct param { int i; }; void subfunc(void *arg) { struct param *p = (struct param *)arg; printf("i = %d\n", p->i); } int main() { threadpool tp = thpool_init(4); int i = 0; struct param p; for (i = 0; i < 100; i++) { p.i = i; thpool_add_work(tp, subfunc, (void *)&p); } thpool_wait(tp); thpool_destroy(tp); }`
the result as follow
~/Code/1010$ ./test.o i = 3 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99
Because all threads share one parameter. At last, p->i is 99, so most output is 99.
On Nov 17, 2019, at 18:26, huyeeeee [email protected] wrote:
the problem is that I defined a struct to store the variable i changed in a foop loop, but after I added all works, then I use function thpool_wait() to wait the work done, but the result is not as expected, the result should be a list of numbers from 0-99, maybe the sequence is variant, but the result of mine is always 99, hope your help,thank you `#include "thpool.h"
struct param { int i; }; void subfunc(void *arg) { struct param *p = (struct param *)arg; printf("i = %d\n", p->i); } int main() { threadpool tp = thpool_init(4); int i = 0; struct param p; for (i = 0; i < 100; i++) { p.i = i; thpool_add_work(tp, subfunc, (void *)&p); } thpool_wait(tp); thpool_destroy(tp); }`
the result as follow ~/Code/1010$ ./test.o i = 3 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99
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Because all threads share one parameter. At last, p->i is 99, so most output is 99. … Thanks for your help! 1.But the first " i " is 3 and there is also a situation that the result formed as some 99s then a different number such as 12 or some other numbers, every time the result is different. 2.Besides, what should I do to avoid the situation, I want to make every number show one time in this threadpool
Thanks for your help! 1.But the first " i " is 3 and there is also a situation that the result formed as some 99s then a different number such as 12 or some other numbers, every time the result is different. 2.Besides, what should I do to avoid the situation, I want to make every number show one time in this threadpool
------------------ 原始邮件 ------------------ 发件人: "iamxiaojin"<[email protected]>; 发送时间: 2019年11月18日(星期一) 中午1:12 收件人: "Pithikos/C-Thread-Pool"<[email protected]>; 抄送: "胡江平"<[email protected]>; "Author"<[email protected]>; 主题: Re: [Pithikos/C-Thread-Pool] My variables is not change (#80)
Because all threads share one parameter. At last, p->i is 99, so most output is 99.
> On Nov 17, 2019, at 18:26, huyeeeee <[email protected]> wrote:
>
> the problem is that I defined a struct to store the variable i changed in a foop loop, but after I added all works, then I use function thpool_wait() to wait the work done, but the result is not as expected, the result should be a list of numbers from 0-99, maybe the sequence is variant, but the result of mine is always 99, hope your help,thank you
> #include "thpool.h" > > struct param > { > int i; > }; > void subfunc(void *arg) > { > struct param *p = (struct param *)arg; > printf("i = %d\n", p->i); > } > int main() > { > threadpool tp = thpool_init(4); > int i = 0; > struct param p; > for (i = 0; i < 100; i++) > { > p.i = i; > thpool_add_work(tp, subfunc, (void *)&p); > } > thpool_wait(tp); > thpool_destroy(tp); > }
>
> the result as follow
> ~/Code/1010$ ./test.o i = 3 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99 i = 99
>
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