sem.h File Reference

#include "pico/lock_core.h"

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Data Structures
struct	semaphore
	A semaphore for controlling access to a shared resource. More...

Typedefs
typedef struct semaphore	semaphore_t
	A semaphore for controlling access to a shared resource.

Functions
void	sem_init (semaphore_t *sem, int16_t initial_permits, int16_t max_permits)
	Initialise a semaphore structure.
int	sem_available (semaphore_t *sem)
	Return number of available permits on the semaphore.
bool	sem_release (semaphore_t *sem)
	Release a permit on a semaphore.
void	sem_reset (semaphore_t *sem, int16_t permits)
	Reset semaphore to a specific number of available permits.
void	sem_acquire_blocking (semaphore_t *sem)
	Acquire a permit from the semaphore.
bool	sem_acquire_timeout_ms (semaphore_t *sem, uint32_t timeout_ms)
	Acquire a permit from a semaphore, with timeout.
bool	sem_acquire_timeout_us (semaphore_t *sem, uint32_t timeout_us)
	Acquire a permit from a semaphore, with timeout.
bool	sem_acquire_block_until (semaphore_t *sem, absolute_time_t until)
	Wait to acquire a permit from a semaphore until a specific time.
bool	sem_try_acquire (semaphore_t *sem)
	Attempt to acquire a permit from a semaphore without blocking.