Basic definitions

Basic definitions 的协作图:

函数
UINTPTR	LOS_Align (UINTPTR addr, UINT32 boundary)
	Align the value (addr) by some bytes (boundary) you specify. 更多...
VOID	LOS_Msleep (UINT32 msecs)
	Sleep the current task. 更多...

详细描述

函数说明

LOS_Align()

UINTPTR LOS_Align	(	UINTPTR	addr,
		UINT32	boundary
	)

Align the value (addr) by some bytes (boundary) you specify.

Description:

This API is used to align the value (addr) by some bytes (boundary) you specify.

注意

• the value of boundary usually is 4,8,16,32.

参数

addr	[IN] The variable what you want to align.
boundary	[IN] The align size what you want to align.

返回值

UINTPTR

The variable what have been aligned.

Dependency:

• los_base.h: the header file that contains the API declaration.

参见

在文件 los_misc.c 第 35 行定义.

{
    if ((addr + boundary - 1) > addr) {
        return (addr + boundary - 1) & ~((UINTPTR)(boundary - 1));
    } else {
        return addr & ~((UINTPTR)(boundary - 1));
    }
}

这是这个函数的调用关系图:

LOS_Msleep()

VOID LOS_Msleep

(

UINT32

msecs

)

Sleep the current task.

Description:

This API is used to delay the execution of the current task. The task is able to be scheduled after it is delayed for a specified number of Ticks.

注意

• The task fails to be delayed if it is being delayed during interrupt processing or it is locked.
• If 0 is passed in and the task scheduling is not locked, execute the next task in the queue of tasks with the priority of the current task. If no ready task with the priority of the current task is available, the task scheduling will not occur, and the current task continues to be executed.
• The parameter passed in can not be equal to LOS_WAIT_FOREVER(0xFFFFFFFF). If that happens, the task will not sleep 0xFFFFFFFF milliseconds or sleep forever but sleep 0xFFFFFFFF Ticks.

参数

msecs

[IN] Type UINT32 Number of MS for which the task is delayed.

返回值

None

Dependency:

• los_base.h: the header file that contains the API declaration.

参见

None

在文件 los_misc.c 第 44 行定义.

{
    UINT32 interval;
 
    if (msecs == 0) {
        interval = 0;
    } else {
        interval = LOS_MS2Tick(msecs);
        if (interval == 0) {
            interval = 1;
        }
    }
 
    (VOID)LOS_TaskDelay(interval);
}

函数调用图:

这是这个函数的调用关系图: