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kernel: Add sequential lock implementation

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This commit is contained in:
Pawel Dziepak
2013-11-05 04:16:13 +01:00
parent 958f6d00aa
commit 4824f7630b
4 changed files with 158 additions and 0 deletions
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headers/os/drivers/KernelExport.h
+17
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@@ -40,6 +40,17 @@ typedef ulong cpu_status;
# define B_SPINLOCK_IS_LOCKED(lock) (*(lock) > 0)
#endif
typedef struct {
spinlock lock;
uint32 count;
} seqlock;
#define B_SEQLOCK_INITIALIZER { B_SPINLOCK_INITIALIZER, 0 }
#define B_INITIALIZE_SEQLOCK(seqlock) do { \
B_INITIALIZE_SPINLOCK((seqlock)->lock); \
(seqlock)->count = 0; \
} while (false)
/* interrupt handling support for device drivers */
typedef int32 (*interrupt_handler)(void *data);
@@ -126,6 +137,12 @@ extern void restore_interrupts(cpu_status status);
extern void acquire_spinlock(spinlock *lock);
extern void release_spinlock(spinlock *lock);
extern bool try_acquire_write_seqlock(seqlock* lock);
extern void acquire_write_seqlock(seqlock* lock);
extern void release_write_seqlock(seqlock* lock);
extern uint32 acquire_read_seqlock(seqlock* lock);
extern bool release_read_seqlock(seqlock* lock, uint32 count);
extern status_t install_io_interrupt_handler(long interrupt_number,
interrupt_handler handler, void *data, ulong flags);
extern status_t remove_io_interrupt_handler(long interrupt_number,