函数
aos_status_t	aos_sem_create (aos_sem_t *sem, uint32_t count, uint32_t options)

void	aos_sem_free (aos_sem_t *sem)

aos_status_t	aos_sem_wait (aos_sem_t *sem, uint32_t timeout)

void	aos_sem_signal (aos_sem_t *sem)

void	aos_sem_signal_all (aos_sem_t *sem)

aos_status_t	aos_sem_new (aos_sem_t *sem, uint32_t count)

bool	aos_sem_is_valid (aos_sem_t *sem)

详细描述

提供AliOS Things系统内核信号量功能的基础API.

类型定义说明

AOS信号量对象句柄类型

在文件 kernel.h 第 118 行定义.

Alloc a semaphore.

参数

[out]	sem	pointer of semaphore object, semaphore object must be alloced, hdl pointer in aos_sem_t will refer a kernel obj internally.
[in]	count	initial semaphore counter.
[in]	options	reserved.

void aos_sem_free ( aos_sem_t * sem )

Destroy a semaphore.

参数

[in] sem pointer of semaphore object, mem refered by hdl pointer in aos_sem_t will be freed internally.

bool aos_sem_is_valid ( aos_sem_t * sem )

This function will check if semaphore is valid. Deprecated, not Recommended.

参数

[in] sem pointer to the sem.

Alloc a semaphore. Deprecated, not Recommended.

参数

[out]	sem	pointer of semaphore object, semaphore object must be alloced, hdl pointer in aos_sem_t will refer a kernel obj internally.
[in]	count	initial semaphore counter.

void aos_sem_signal ( aos_sem_t * sem )

Release a semaphore.

参数

[in] sem semaphore object, it contains kernel obj pointer which aos_sem_new alloced.

void aos_sem_signal_all ( aos_sem_t * sem )

Release all semaphore.

参数

[in] sem semaphore object, it contains kernel obj pointer which aos_sem_new alloced.

Acquire a semaphore.

参数

[in]	sem	semaphore object, it contains kernel obj pointer which aos_sem_new alloced.
[in]	timeout	waiting until timeout in milliseconds.