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/*
* Copyright (c) 2012, ARM Limited. All rights reserved.
*
* Redistribution and use in source and binary forms, with
* or without modification, are permitted provided that the
* following conditions are met:
*
* Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
*
* Redistributions in binary form must reproduce the
* above copyright notice, this list of conditions and
* the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of ARM nor the names of its
* contributors may be used to endorse or promote products
* derived from this software without specific prior written
* permission.
*/
#ifndef _BAKERY_H_
#define _BAKERY_H_
#define MAX_CPUS 4
/*
* Bakery structure - declare/allocate one of these for each lock.
* A pointer to this struct is passed to the lock/unlock functions.
*/
typedef struct {
volatile char entering[MAX_CPUS];
volatile unsigned number[MAX_CPUS];
} bakery_t;
/*
* Initialize a bakery - only required if the bakery_t is
* on the stack or heap, as static data is zeroed anyway.
*/
extern void init_bakery_spinlock(bakery_t * bakery);
/*
* Claim a bakery lock. Function does not return until
* lock has been obtained.
*/
extern void get_bakery_spinlock(unsigned cpuid, bakery_t * bakery);
/*
* Release a bakery lock.
*/
extern void release_bakery_spinlock(unsigned cpuid, bakery_t * bakery);
#endif /* _BAKERY_H_ */
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