/usr/local/google/home/srhines/android_trees/jb-mr2-dev/frameworks/rs/scriptc/rs_atomic.rsh File Reference

Functions
int32_t	rsAtomicInc (volatile int32_t *addr)
uint32_t	rsAtomicInc (volatile uint32_t *addr)
int32_t	rsAtomicDec (volatile int32_t *addr)
uint32_t	rsAtomicDec (volatile uint32_t *addr)
int32_t	rsAtomicAdd (volatile int32_t *addr, int32_t value)
uint32_t	rsAtomicAdd (volatile uint32_t *addr, uint32_t value)
int32_t	rsAtomicSub (volatile int32_t *addr, int32_t value)
uint32_t	rsAtomicSub (volatile uint32_t *addr, uint32_t value)
int32_t	rsAtomicAnd (volatile int32_t *addr, int32_t value)
uint32_t	rsAtomicAnd (volatile uint32_t *addr, uint32_t value)
int32_t	rsAtomicOr (volatile int32_t *addr, int32_t value)
uint32_t	rsAtomicOr (volatile uint32_t *addr, uint32_t value)
uint32_t	rsAtomicXor (volatile uint32_t *addr, uint32_t value)
int32_t	rsAtomicXor (volatile int32_t *addr, int32_t value)
uint32_t	rsAtomicMin (volatile uint32_t *addr, uint32_t value)
int32_t	rsAtomicMin (volatile int32_t *addr, int32_t value)
uint32_t	rsAtomicMax (volatile uint32_t *addr, uint32_t value)
int32_t	rsAtomicMax (volatile int32_t *addr, int32_t value)
int32_t	rsAtomicCas (volatile int32_t *addr, int32_t compareValue, int32_t newValue)
uint32_t	rsAtomicCas (volatile uint32_t *addr, uint32_t compareValue, uint32_t newValue)

---

Detailed Description

Atomic routines.

Definition in file rs_atomic.rsh.

---

Function Documentation

int32_t rsAtomicAdd	(	volatile int32_t *	addr,
		int32_t	value
	)

Atomic add a value to the value at addr. addr[0] += value

Parameters:

addr	Address of value to modify
value	Amount to add to the value at addr

Returns:

old value

uint32_t rsAtomicAdd	(	volatile uint32_t *	addr,
		uint32_t	value
	)

Atomic add a value to the value at addr. addr[0] += value

Parameters:

addr	Address of value to modify
value	Amount to add to the value at addr

Returns:

old value

int32_t rsAtomicAnd	(	volatile int32_t *	addr,
		int32_t	value
	)

Atomic Bitwise and a value from the value at addr. addr[0] &= value

Parameters:

addr	Address of value to modify
value	Amount to and with the value at addr

Returns:

old value

uint32_t rsAtomicAnd	(	volatile uint32_t *	addr,
		uint32_t	value
	)

Atomic Bitwise and a value from the value at addr. addr[0] &= value

Parameters:

addr	Address of value to modify
value	Amount to and with the value at addr

Returns:

old value

int32_t rsAtomicCas	(	volatile int32_t *	addr,
		int32_t	compareValue,
		int32_t	newValue
	)

Compare-and-set operation with a full memory barrier.

If the value at addr matches compareValue then newValue is written.

Parameters:

addr	The address to compare and replace if the compare passes.
compareValue	The value to test addr[0] against.
newValue	The value to write if the test passes.

Returns:

old value

uint32_t rsAtomicCas	(	volatile uint32_t *	addr,
		uint32_t	compareValue,
		uint32_t	newValue
	)

Compare-and-set operation with a full memory barrier.

If the value at addr matches compareValue then newValue is written.

Parameters:

addr	The address to compare and replace if the compare passes.
compareValue	The value to test addr[0] against.
newValue	The value to write if the test passes.

Returns:

old value

int32_t rsAtomicDec

(

volatile int32_t *

addr

)

Atomic subtract one from the value at addr. Equal to rsAtomicSub(addr, 1)

Parameters:

addr	Address of value to decrement

Returns:

old value

uint32_t rsAtomicDec

(

volatile uint32_t *

addr

)

Atomic subtract one from the value at addr. Equal to rsAtomicSub(addr, 1)

Parameters:

addr	Address of value to decrement

Returns:

old value

int32_t rsAtomicInc

(

volatile int32_t *

addr

)

Atomic add one to the value at addr. Equal to rsAtomicAdd(addr, 1)

Parameters:

addr	Address of value to increment

Returns:

old value

uint32_t rsAtomicInc

(

volatile uint32_t *

addr

)

Atomic add one to the value at addr. Equal to rsAtomicAdd(addr, 1)

Parameters:

addr	Address of value to increment

Returns:

old value

uint32_t rsAtomicMax	(	volatile uint32_t *	addr,
		uint32_t	value
	)

Atomic Set the value at addr to the max of addr and value addr[0] = rsMax(addr[0], value)

Parameters:

addr	Address of value to modify
value	comparison value

Returns:

old value

int32_t rsAtomicMax	(	volatile int32_t *	addr,
		int32_t	value
	)

Atomic Set the value at addr to the max of addr and value addr[0] = rsMin(addr[0], value)

Parameters:

addr	Address of value to modify
value	comparison value

Returns:

old value

uint32_t rsAtomicMin	(	volatile uint32_t *	addr,
		uint32_t	value
	)

Atomic Set the value at addr to the min of addr and value addr[0] = rsMin(addr[0], value)

Parameters:

addr	Address of value to modify
value	comparison value

Returns:

old value

int32_t rsAtomicMin	(	volatile int32_t *	addr,
		int32_t	value
	)

Atomic Set the value at addr to the min of addr and value addr[0] = rsMin(addr[0], value)

Parameters:

addr	Address of value to modify
value	comparison value

Returns:

old value

int32_t rsAtomicOr	(	volatile int32_t *	addr,
		int32_t	value
	)

Atomic Bitwise or a value from the value at addr. addr[0] |= value

Parameters:

addr	Address of value to modify
value	Amount to or with the value at addr

Returns:

old value

uint32_t rsAtomicOr	(	volatile uint32_t *	addr,
		uint32_t	value
	)

Atomic Bitwise or a value from the value at addr. addr[0] |= value

Parameters:

addr	Address of value to modify
value	Amount to or with the value at addr

Returns:

old value

int32_t rsAtomicSub	(	volatile int32_t *	addr,
		int32_t	value
	)

Atomic Subtract a value from the value at addr. addr[0] -= value

Parameters:

addr	Address of value to modify
value	Amount to subtract from the value at addr

Returns:

old value

uint32_t rsAtomicSub	(	volatile uint32_t *	addr,
		uint32_t	value
	)

Atomic Subtract a value from the value at addr. addr[0] -= value

Parameters:

addr	Address of value to modify
value	Amount to subtract from the value at addr

Returns:

old value

uint32_t rsAtomicXor	(	volatile uint32_t *	addr,
		uint32_t	value
	)

Atomic Bitwise xor a value from the value at addr. addr[0] ^= value

Parameters:

addr	Address of value to modify
value	Amount to xor with the value at addr

Returns:

old value

int32_t rsAtomicXor	(	volatile int32_t *	addr,
		int32_t	value
	)

Atomic Bitwise xor a value from the value at addr. addr[0] ^= value

Parameters:

addr	Address of value to modify
value	Amount to xor with the value at addr

Returns:

old value