>我已经创建了两个线程,我想在创建它们后查看它们的优先级:-为此,我编写了以下代码:-
#include <iostream>
#include <unistd.h>
#include <pthread.h>
#include <sched.h>
#include <string.h>
#include <errno.h>
int main()
{ //something
struct sched_param main_param, t1_param, t2_param;
pthread_t t1, t2;
int *sched1, *sched2;
if (pthread_create(&t1, NULL, fn1, NULL) != 0) // inside fn1 thread sleeps in loop
{
std::cout << "couldn't create t1" << std::endl;
return -1;
}
if (pthread_create(&t2, NULL, fn2, NULL) != 0) //inside fn2 thread sleeps in loop
{
std::cout << "couldn't create t2" << std::endl;
return -1;
}
if (pthread_getschedparam(t1, sched1, &t1_param) != 0)
{
std::cout << "error setting priority for T1: (" << errno << "), " <<
strerror(errno) << std::endl;
}
std::cout << "t1 thread will have a prio of " << t1_param.sched_priority << std::endl;
if (pthread_getschedparam(t1, sched2, &t1_param) != 0)
{
std::cout << "error setting priority for T1: (" << errno << "), " <<
strerror(errno) << std::endl;
}
std::cout << "t2 thread will have a prio of " << t2_param.sched_priority <<std::endl;
// something
}
只有当我添加与pthread_getschedparam
相关的代码时,我才得到分段错误,否则代码工作正常.我在这里做错了什么吗?我什至尝试用NULL
替换sched1
和sched2
您声明了指针sched1
和sched2
类型为 int*
,但从未初始化过这些指针。您需要分配int
变量,然后将指针传递给这些变量。
喜欢这个:
int sched1, sched2;
.....
if (pthread_getschedparam(t1, &sched1, ....
int *sched1;pthread_getschedparam(T1、Sched1 和 t1_param(;sched1 是未初始化的指针!
请考虑此更改:
国际调度1;pthread_getschedparam(T1, 和 Sched1, &t1_param(;