Semaphores

Collaboration diagram for Semaphores:

Functions
uint32_t	sys_arch_sem_wait (struct sys_sem **s, uint32_t timeout)
void	sys_sem_free (sys_sem_t **sem)
err_t	sys_sem_new (sys_sem_t **sem, u8_t count)
void	sys_sem_set_invalid (struct sys_sem **s)
void	sys_sem_signal (struct sys_sem **s)
int	sys_sem_valid (struct sys_sem **s)

Detailed Description

Function Documentation

sys_arch_sem_wait()

uint32_t sys_arch_sem_wait	(	struct sys_sem **	s,
		uint32_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 104 of file sys_arch.c.

References LWIP_ASSERT, mutex, NULL, signaled, and ubthread_mutex_lock().

Referenced by sys_msleep().

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sys_sem_free()

void sys_sem_free

(

sys_sem_t **

sem

)

Delete a semaphore

Parameters

sem	semaphore to delete

Definition at line 75 of file sys_arch.c.

References NULL, sem_destroy(), and SYS_SEM_NULL.

Referenced by sys_msleep().

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sys_sem_new()

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 52 of file sys_arch.c.

References cond, ERR_OK, kmalloc(), kprintf(), mutex, NULL, sem_init(), signaled, ubthread_cond_init(), and ubthread_mutex_init().

Referenced by sys_msleep(), and tcpip_api_call().

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sys_sem_set_invalid()

void sys_sem_set_invalid

(

struct sys_sem **

s

)

Set a semaphore invalid so that sys_sem_valid returns 0

Definition at line 139 of file sys_arch.c.

sys_sem_signal()

void sys_sem_signal

(

struct sys_sem **

s

)

Signals a semaphore

Parameters

sem	the semaphore to signal

Definition at line 88 of file sys_arch.c.

References cond, LWIP_ASSERT, mutex, NULL, signaled, ubthread_cond_broadcast(), ubthread_mutex_lock(), and ubthread_mutex_unlock().

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sys_sem_valid()

int sys_sem_valid

(

struct sys_sem **

s

)

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

Definition at line 131 of file sys_arch.c.

Referenced by tcpip_send_msg_wait_sem().