Cygdrvspinlocktry, Cygdrvspinlocktest, Cyg_drv_spinlock_try – Comtrol eCos User Manual

Page 395: Cyg_drv_spinlock_test

Chapter 18. Device Driver Interface to the Kernel

Arguments:

lock

- pointer to spinlock to clear

Result:

None

Level:

ISR

Description:

Clear a spinlock. This clears the spinlock and allows another CPU to claim it. If there is more than one CPU

waiting in

cyg_drv_spinlock_spin()

then just one of them will be allowed to proceed.

cyg_drv_spinlock_try

Function:

cyg_bool_t cyg_drv_spinlock_try(cyg_spinlock_t *lock )

Arguments:

lock

- pointer to spinlock to try

Result:

TRUE

if the spinlock was claimed,

FALSE

otherwise.

Level:

ISR

Description:

Try to claim the spinlock without waiting. If the spinlock could be claimed immediately then

TRUE

is returned.

If the spinlock is already claimed then the result is

FALSE

cyg_drv_spinlock_test

Function:

cyg_bool_t cyg_drv_spinlock_test(cyg_spinlock_t *lock )

Arguments:

lock

- pointer to spinlock to test

Result:

TRUE

if the spinlock is available,

FALSE

otherwise.

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