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inverse Semaphores

Lightweight inverse semaphore implementation More...

Detailed Description

Lightweight inverse semaphore implementation

Files

file  sema_inv.h
 Inverse Semaphore definitions.
 

Data Structures

struct  sema_inv_t
 An Inverse Semaphore. More...
 

Functions

bool sema_inv_post (sema_inv_t *s)
 Signal semaphore (counter mode).
 
bool sema_inv_post_mask (sema_inv_t *s, uint32_t mask)
 Signal semaphore (mask mode).
 
static void sema_inv_init (sema_inv_t *s, uint32_t value)
 Initialize an inverse semaphore.
 
static void sema_inv_wait (sema_inv_t *s)
 Wait for the inverse semaphore value to reach zero.
 
static int sema_inv_try_wait (sema_inv_t *s)
 Check if the inverse semaphore value has reached zero.
 
static int sema_inv_wait_timeout (sema_inv_t *s, uint32_t us)
 Wait for the inverse semaphore value to reach zero or a timeout being reached.
 

Function Documentation

◆ sema_inv_init()

static void sema_inv_init ( sema_inv_t * s,
uint32_t value )
inlinestatic

Initialize an inverse semaphore.

Parameters
san inverse semaphore
valuestart value, either a counter or a bit mask

Definition at line 99 of file sema_inv.h.

◆ sema_inv_post()

bool sema_inv_post ( sema_inv_t * s)

Signal semaphore (counter mode).

     Decrements the semaphore counter by one.
     If the counter reaches zero, the waiting thread is woken.
Parameters
san inverse semaphore
Return values
`true`the value of the semaphore has reached zero and the waiting thread has been woken
`false`the semaphore has not reached zero yet

◆ sema_inv_post_mask()

bool sema_inv_post_mask ( sema_inv_t * s,
uint32_t mask )

Signal semaphore (mask mode).

     Clears the bits specified by @p mask from the semaphore value.
     If the value reaches zero, the waiting thread is woken.
Parameters
san inverse semaphore
maskbit mask to clear from the semaphore value
Return values
`true`the value of the semaphore has reached zero and the waiting thread has been woken
`false`the semaphore has not reached zero yet

◆ sema_inv_try_wait()

static int sema_inv_try_wait ( sema_inv_t * s)
inlinestatic

Check if the inverse semaphore value has reached zero.

Parameters
sAn inverse semaphore.
Returns
1 if the semaphore value has reached zero 0 otherwise

Definition at line 124 of file sema_inv.h.

◆ sema_inv_wait()

static void sema_inv_wait ( sema_inv_t * s)
inlinestatic

Wait for the inverse semaphore value to reach zero.

Parameters
sAn inverse semaphore.

Definition at line 111 of file sema_inv.h.

◆ sema_inv_wait_timeout()

static int sema_inv_wait_timeout ( sema_inv_t * s,
uint32_t us )
inlinestatic

Wait for the inverse semaphore value to reach zero or a timeout being reached.

Parameters
sAn inverse semaphore.
usTime in microseconds until the semaphore times out.
Returns
0 if the semaphore value has reached zero -1 when the timeout occurred

Definition at line 140 of file sema_inv.h.