Mutexes

Functions
err_t	sys_mutex_new (sys_mutex_t *mutex)
void	sys_mutex_lock (sys_mutex_t *mutex)
void	sys_mutex_unlock (sys_mutex_t *mutex)
void	sys_mutex_free (sys_mutex_t *mutex)
int	sys_mutex_valid (sys_mutex_t *mutex)
void	sys_mutex_set_invalid (sys_mutex_t *mutex)

Detailed Description

Mutexes are recommended to correctly handle priority inversion, especially if you use LWIP_CORE_LOCKING .

Function Documentation

sys_mutex_free()

void sys_mutex_free

(

sys_mutex_t *

mutex

)

Delete a semaphore

Parameters

mutex

the mutex to delete

sys_mutex_lock()

void sys_mutex_lock

(

sys_mutex_t *

mutex

)

Lock a mutex

Parameters

mutex

the mutex to lock

sys_mutex_new()

err_t sys_mutex_new

(

sys_mutex_t *

mutex

)

Create a new mutex. Note that mutexes are expected to not be taken recursively by the lwIP code, so both implementation types (recursive or non-recursive) should work.

Parameters

mutex

pointer to the mutex to create

Returns

ERR_OK if successful, another err_t otherwise

sys_mutex_set_invalid()

void sys_mutex_set_invalid

(

sys_mutex_t *

mutex

)

Set a mutex invalid so that sys_mutex_valid returns 0

sys_mutex_unlock()

void sys_mutex_unlock

(

sys_mutex_t *

mutex

)

Unlock a mutex

Parameters

mutex

the mutex to unlock

sys_mutex_valid()

int sys_mutex_valid

(

sys_mutex_t *

mutex

)

Check if a mutex is valid/allocated: return 1 for valid, 0 for invalid