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OmniWheels
by 
Gustav Atmel
Semaphores
[OS abstraction layer]
Functions | |
| err_t | sys_sem_new (sys_sem_t *sem, u8_t count) |
| Create a new semaphore. | |
| void | sys_sem_signal (sys_sem_t *sem) |
| Signals a semaphore. | |
| u32_t | sys_arch_sem_wait (sys_sem_t *sem, u32_t timeout) |
| Wait for a semaphore for the specified timeout. | |
| void | sys_sem_free (sys_sem_t *sem) |
| Delete a semaphore. | |
| int | sys_sem_valid (sys_sem_t *sem) |
| Check if a semaphore is valid/allocated: return 1 for valid, 0 for invalid. | |
| void | sys_sem_set_invalid (sys_sem_t *sem) |
| Set a semaphore invalid so that sys_sem_valid returns 0. | |
Function Documentation
| u32_t sys_arch_sem_wait | ( | sys_sem_t * | sem, |
| u32_t | timeout | ||
| ) |
Wait for a semaphore for the specified timeout.
- Parameters:
-
sem the semaphore to wait for timeout timeout in milliseconds to wait (0 = wait forever)
- Returns:
- time (in milliseconds) waited for the semaphore or SYS_ARCH_TIMEOUT on timeout
Definition at line 341 of file lwip_sys_arch.c.
| void sys_sem_free | ( | sys_sem_t * | sem ) |
Delete a semaphore.
- Parameters:
-
sem semaphore to delete
Definition at line 371 of file lwip_sys_arch.c.
| err_t sys_sem_new | ( | sys_sem_t * | sem, |
| u8_t | count | ||
| ) |
Create a new semaphore.
- Parameters:
-
sem pointer to the semaphore to create count initial count of the semaphore
- Returns:
- ERR_OK if successful, another err_t otherwise
Definition at line 307 of file lwip_sys_arch.c.
| void sys_sem_set_invalid | ( | sys_sem_t * | sem ) |
Set a semaphore invalid so that sys_sem_valid returns 0.
| void sys_sem_signal | ( | sys_sem_t * | sem ) |
Signals a semaphore.
- Parameters:
-
sem the semaphore to signal
Definition at line 358 of file lwip_sys_arch.c.
| int sys_sem_valid | ( | sys_sem_t * | sem ) |
Check if a semaphore is valid/allocated: return 1 for valid, 0 for invalid.
Generated on Fri Jul 22 2022 04:54:09 by
1.7.2