pthread_create创建线程失败，返回值22

yuzhong1992 2017-05-03 02:41:20

使用pthread_create创建线程，如果在之前加上这句代码（如下），就总是失败，返回值22。
pthread_attr_getschedparam(&attr, SCHED_RR);
我的想法就是需要创建实时调度的线程。用上sudo执行程序，也是不行的。

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LubinLew 2017-05-14

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设置了PTHREAD_EXPLICIT_SCHED ，就要手动设置参数（pthread_attr_setschedparam）


#include <stdio.h>
#include <stdlib.h> //for exit
#include <unistd.h> //for sleep
#include <string.h> //for strerror
#include <errno.h>
#include <pthread.h>

#define PTHREAD_RET_CHK(ret, func)  { \
	if (ret != 0) {	\
		if (ret == -1) { \
			printf("%s failed with code %d, %s\n", #func, ret, strerror(errno));\
		} else { \
			printf("%s failed with code %d, %s\n", #func, ret, strerror(ret)); \
		} \
	exit(EXIT_FAILURE); \
	} \
}


void* routine_entry(void* arg)
{
	sleep(1);
	printf("i am the new thread\n");
	sleep(1);
	pthread_exit(arg);
}

int main(void)
{
	int ret = 0;
	int status = 0;
	pthread_attr_t attr;
	struct sched_param param;
	pthread_t pid;

	ret = pthread_attr_init(&attr);
	PTHREAD_RET_CHK(ret, pthread_attr_init);

	ret = pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED);
	PTHREAD_RET_CHK(ret, pthread_attr_setinheritsched);

	ret = pthread_attr_setschedpolicy(&attr, SCHED_RR);
	PTHREAD_RET_CHK(ret, pthread_attr_setschedpolicy);

	param.sched_priority = sched_get_priority_max(SCHED_RR);
	ret = pthread_attr_setschedparam(&attr, ¶m);
	PTHREAD_RET_CHK(ret, pthread_attr_setschedparam);

	ret = pthread_create(&pid, &attr, routine_entry, (void*)123);
	PTHREAD_RET_CHK(ret, pthread_create);

	ret = pthread_attr_destroy(&attr);
	PTHREAD_RET_CHK(ret, retpthread_attr_destroy);	

	ret = pthread_join(pid, (void**)&status);
	PTHREAD_RET_CHK(ret, retpthread_join); 

	printf("new thread is finish with code %d\n", status);

	exit(EXIT_SUCCESS);
}

yuzhong1992 2017-05-09

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设置了线程不继承创建者的调度测试：PTHREAD_EXPLICIT_SCHED

LubinLew 2017-05-09

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使用流程对吗


#include <stdio.h>
#include <stdlib.h> //for exit
#include <unistd.h> //for sleep
#include <string.h> //for strerror
#include <errno.h>
#include <pthread.h>

#define PTHREAD_RET_CHK(ret, func)  { \
	if (ret != 0) {	\
		if (ret == -1) { \
			printf("%s failed with code %d\n, %s", #func, ret, strerror(errno));\
		} else { \
			printf("%s failed with code %d\n", #func, ret); \
		} \
	exit(EXIT_FAILURE); \
	} \
}


void* routine_entry(void* arg)
{
	sleep(1);
	printf("i am the new thread\n");
	sleep(1);
	pthread_exit(arg);
}

int main(void)
{
	int ret = 0;
	int status = 0;
	pthread_attr_t attr;
	pthread_t pid;

	ret = pthread_attr_init(&attr);
	PTHREAD_RET_CHK(ret, pthread_attr_init);

	ret = pthread_attr_setschedpolicy(&attr, SCHED_RR);
	PTHREAD_RET_CHK(ret, pthread_attr_setschedpolicy);	

	ret = pthread_create(&pid, &attr, routine_entry, (void*)123);
	PTHREAD_RET_CHK(ret, pthread_create);

	ret = pthread_attr_destroy(&attr);
	PTHREAD_RET_CHK(ret, retpthread_attr_destroy);	

	ret = pthread_join(pid, (void**)&status);
	PTHREAD_RET_CHK(ret, retpthread_join); 

	printf("new thread is finish with code %d\n", status);

	exit(EXIT_SUCCESS);
}

lyl_709156147 2017-05-09

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有没有使用pthread_attr_setinheritsched(pthread_attr_t *attr,int inheritsched)函数，设置线程是否继承创建者的调度策略。 inheritsched: PTHREAD_INHERIT_SCHED 继承创建者的调度策略 PTHREAD_EXPLICIT_SCHED 使用属性变量中的调度策略

yuzhong1992 2017-05-08

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发帖时，头晕，写错了。代码是这个： pthread_attr_setschedpolicy(&attr, SCHED_RR );

我用双手-成就你的梦想 2017-05-04

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int pthread_attr_setschedparam(pthread_attr_t *attr, const struct sched_param *param); int pthread_attr_getschedparam(pthread_attr_t *attr, struct sched_param *param); 你这个参数都写错了