Semaphores

Collaboration diagram for Semaphores:

Functions
err_t	sys_sem_new (sys_sem_t *sem, u8_t count)
void	sys_sem_signal (sys_sem_t *sem)
u32_t	sys_arch_sem_wait (sys_sem_t *sem, u32_t timeout)
void	sys_sem_free (sys_sem_t *sem)
int	sys_sem_valid (sys_sem_t *sem)
void	sys_sem_set_invalid (sys_sem_t *sem)

Detailed Description

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 157 of file sys_arch.cc.

References Semaphore::acquire(), ERR_ARG, ERR_OK, and SYS_ARCH_TIMEOUT.

Referenced by sys_msleep(), tcpip_api_call(), and tcpip_send_msg_wait_sem().

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void sys_sem_free

(

sys_sem_t *

sem

)

Delete a semaphore

Parameters

sem	semaphore to delete

Definition at line 113 of file sys_arch.cc.

Referenced by sys_msleep(), and tcpip_api_call().

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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 95 of file sys_arch.cc.

References ERR_ARG, and ERR_OK.

Referenced by sys_msleep(), and tcpip_api_call().

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void sys_sem_set_invalid

(

sys_sem_t *

sem

)

Set a semaphore invalid so that sys_sem_valid returns 0

Definition at line 140 of file sys_arch.cc.

void sys_sem_signal

(

sys_sem_t *

sem

)

Signals a semaphore

Parameters

sem	the semaphore to signal

Definition at line 147 of file sys_arch.cc.

References Semaphore::release().

int sys_sem_valid

(

sys_sem_t *

sem

)

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

Definition at line 124 of file sys_arch.cc.

Referenced by tcpip_send_msg_wait_sem().

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