sched.c 文件参考

浏览源代码.

函数
int	sched_get_priority_min (int policy)
int	sched_get_priority_max (int policy)
int	sched_setaffinity (pid_t pid, size_t set_size, const cpu_set_t *set)
int	sched_getaffinity (pid_t pid, size_t set_size, cpu_set_t *set)
int	__sched_cpucount (size_t set_size, const cpu_set_t *set)
int	sched_yield ()
	任务让出CPU 更多...

函数说明

__sched_cpucount()

int __sched_cpucount	(	size_t	set_size,
		const cpu_set_t *	set
	)

在文件 sched.c 第 126 行定义.

{
    INT32 count = 0;
    UINT32 i;
 
    if ((set_size != sizeof(cpu_set_t)) || (set == NULL)) {
        return 0;
    }
 
    for (i = 0; i < set_size / sizeof(__CPU_BITTYPE); i++) {
        count += __builtin_popcountl(set->__bits[i]);
    }
 
    return count;
}

sched_get_priority_max()

int sched_get_priority_max

(

int

policy

)

在文件 sched.c 第 49 行定义.

{
    if (policy != SCHED_RR) {
        errno = EINVAL;
        return -1;
    }
 
    return OS_TASK_PRIORITY_LOWEST;
}

sched_get_priority_min()

int sched_get_priority_min

(

int

policy

)

在文件 sched.c 第 39 行定义.

{
    if (policy != SCHED_RR) {
        errno = EINVAL;
        return -1;
    }
 
    return OS_TASK_PRIORITY_HIGHEST;
}

sched_getaffinity()

int sched_getaffinity	(	pid_t	pid,
		size_t	set_size,
		cpu_set_t *	set
	)

在文件 sched.c 第 95 行定义.

{
#ifdef LOSCFG_KERNEL_SMP
    UINT32 taskID = (UINT32)pid;
    UINT16 cpuAffiMask;
 
    if ((set == NULL) || (set_size != sizeof(cpu_set_t))) {
        errno = EINVAL;
        return -1;
    }
 
    if (taskID == 0) {
        taskID = LOS_CurTaskIDGet();
        if (taskID == LOS_ERRNO_TSK_ID_INVALID) {
            errno = EINVAL;
            return -1;
        }
    }
 
    cpuAffiMask = LOS_TaskCpuAffiGet(taskID);
    if (cpuAffiMask == 0) {
        errno = EINVAL;
        return -1;
    }
 
    set->__bits[0] = cpuAffiMask;
#endif
 
    return 0;
}

函数调用图:

这是这个函数的调用关系图:

sched_setaffinity()

int sched_setaffinity	(	pid_t	pid,
		size_t	set_size,
		const cpu_set_t *	set
	)

在文件 sched.c 第 63 行定义.

{
#ifdef LOSCFG_KERNEL_SMP
    UINT32 taskID = (UINT32)pid;
    UINT32 ret;
 
    if ((set == NULL) || (set_size != sizeof(cpu_set_t)) || (set->__bits[0] > LOSCFG_KERNEL_CPU_MASK)) {
        errno = EINVAL;
        return -1;
    }
 
    if (taskID == 0) {
        taskID = LOS_CurTaskIDGet();
        if (taskID == LOS_ERRNO_TSK_ID_INVALID) {
            errno = EINVAL;
            return -1;
        }
    }
 
    ret = LOS_TaskCpuAffiSet(taskID, (UINT16)set->__bits[0]);
    if (ret != LOS_OK) {
        errno = map_errno(ret);
        return -1;
    }
#endif
 
    return 0;
}

函数调用图:

这是这个函数的调用关系图:

sched_yield()

int sched_yield

(

)

任务让出CPU

在文件 sched.c 第 142 行定义.

{
    (void)LOS_TaskYield();
    return 0;
}

函数调用图: