Comtrol eCos - Manual (Page 396)

Chapter 18. Device Driver Interface to the Kernel
Level:
ISR
Description:
Inspect the state of the spinlock. If the spinlock is not locked then the result is TRUE . If it is locked then the
result will be FALSE .
cyg_drv_spinlock_spin_intsave
Function:
void cyg_drv_spinlock_spin_intsave(cyg_spinlock_t *lock,
cyg_addrword_t *istate )
Arguments:
lock - pointer to spinlock to claim
istate - pointer to interrupt state save location
Result:
None
Level:
ISR
Description:
This function behaves exactly like cyg_drv_spinlock_spin() except that it also disables interrupts
before attempting to claim the lock. The current interrupt enable state is saved in *istate .
Interrupts remain disabled once the spinlock had been claimed and must be restored by calling
cyg_drv_spinlock_clear_intsave() .
In general, device drivers should use this function to claim and release spinlocks rather than the
non-
_intsave() variants, to ensure proper exclusion with code running on both other CPUs and this CPU.
cyg_drv_spinlock_clear_intsave
Function:
void cyg_drv_spinlock_clear_intsave( cyg_spinlock_t *lock,
cyg_addrword_t istate )
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