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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// Don't edit this file! It is auto-generated by frameworks/rs/api/generate.sh.
/*
* rs_atomic.rsh: Atomic Update Functions
*
* To update values shared between multiple threads, use the functions below.
* They ensure that the values are atomically updated, i.e. that the memory
* reads, the updates, and the memory writes are done in the right order.
*
* These functions are slower than their non-atomic equivalents, so use
* them only when synchronization is needed.
*
* Note that in RenderScript, your code is likely to be running in separate
* threads even though you did not explicitely create them. The RenderScript
* runtime will very often split the execution of one kernel across multiple
* threads. Updating globals should be done with atomic functions. If possible,
* modify your algorithm to avoid them altogether.
*/
#ifndef RENDERSCRIPT_RS_ATOMIC_RSH
#define RENDERSCRIPT_RS_ATOMIC_RSH
/*
* rsAtomicAdd: Thread-safe addition
*
* Atomicly adds a value to the value at addr, i.e. *addr += value.
*
* Parameters:
* addr: Address of the value to modify.
* value: Amount to add.
*
* Returns: Value of *addr prior to the operation.
*/
#if (defined(RS_VERSION) && (RS_VERSION >= 14))
extern int32_t __attribute__((overloadable))
rsAtomicAdd(volatile int32_t* addr, int32_t value);
#endif
#if (defined(RS_VERSION) && (RS_VERSION >= 20))
extern int32_t __attribute__((overloadable))
rsAtomicAdd(volatile uint32_t* addr, uint32_t value);
#endif
/*
* rsAtomicAnd: Thread-safe bitwise and
*
* Atomicly performs a bitwise and of two values, storing the result back at addr,
* i.e. *addr &= value.
*
* Parameters:
* addr: Address of the value to modify.
* value: Value to and with.
*
* Returns: Value of *addr prior to the operation.
*/
#if (defined(RS_VERSION) && (RS_VERSION >= 14))
extern int32_t __attribute__((overloadable))
rsAtomicAnd(volatile int32_t* addr, int32_t value);
#endif
#if (defined(RS_VERSION) && (RS_VERSION >= 20))
extern int32_t __attribute__((overloadable))
rsAtomicAnd(volatile uint32_t* addr, uint32_t value);
#endif
/*
* rsAtomicCas: Thread-safe compare and set
*
* If the value at addr matches compareValue then the newValue is written at addr,
* i.e. if (*addr == compareValue) { *addr = newValue; }.
*
* You can check that the value was written by checking that the value returned
* by rsAtomicCas() is compareValue.
*
* Parameters:
* addr: Address of the value to compare and replace if the test passes.
* compareValue: Value to test *addr against.
* newValue: Value to write if the test passes.
*
* Returns: Value of *addr prior to the operation.
*/
#if (defined(RS_VERSION) && (RS_VERSION >= 14))
extern int32_t __attribute__((overloadable))
rsAtomicCas(volatile int32_t* addr, int32_t compareValue, int32_t newValue);
#endif
#if (defined(RS_VERSION) && (RS_VERSION >= 14))
extern uint32_t __attribute__((overloadable))
rsAtomicCas(volatile uint32_t* addr, uint32_t compareValue, uint32_t newValue);
#endif
/*
* rsAtomicDec: Thread-safe decrement
*
* Atomicly subtracts one from the value at addr. This is equivalent to rsAtomicSub(addr, 1).
*
* Parameters:
* addr: Address of the value to decrement.
*
* Returns: Value of *addr prior to the operation.
*/
#if (defined(RS_VERSION) && (RS_VERSION >= 14))
extern int32_t __attribute__((overloadable))
rsAtomicDec(volatile int32_t* addr);
#endif
#if (defined(RS_VERSION) && (RS_VERSION >= 20))
extern int32_t __attribute__((overloadable))
rsAtomicDec(volatile uint32_t* addr);
#endif
/*
* rsAtomicInc: Thread-safe increment
*
* Atomicly adds one to the value at addr. This is equivalent to rsAtomicAdd(addr, 1).
*
* Parameters:
* addr: Address of the value to increment.
*
* Returns: Value of *addr prior to the operation.
*/
#if (defined(RS_VERSION) && (RS_VERSION >= 14))
extern int32_t __attribute__((overloadable))
rsAtomicInc(volatile int32_t* addr);
#endif
#if (defined(RS_VERSION) && (RS_VERSION >= 20))
extern int32_t __attribute__((overloadable))
rsAtomicInc(volatile uint32_t* addr);
#endif
/*
* rsAtomicMax: Thread-safe maximum
*
* Atomicly sets the value at addr to the maximum of *addr and value, i.e.
* *addr = max(*addr, value).
*
* Parameters:
* addr: Address of the value to modify.
* value: Comparison value.
*
* Returns: Value of *addr prior to the operation.
*/
#if (defined(RS_VERSION) && (RS_VERSION >= 14))
extern uint32_t __attribute__((overloadable))
rsAtomicMax(volatile uint32_t* addr, uint32_t value);
#endif
#if (defined(RS_VERSION) && (RS_VERSION >= 14))
extern int32_t __attribute__((overloadable))
rsAtomicMax(volatile int32_t* addr, int32_t value);
#endif
/*
* rsAtomicMin: Thread-safe minimum
*
* Atomicly sets the value at addr to the minimum of *addr and value, i.e.
* *addr = min(*addr, value).
*
* Parameters:
* addr: Address of the value to modify.
* value: Comparison value.
*
* Returns: Value of *addr prior to the operation.
*/
#if (defined(RS_VERSION) && (RS_VERSION >= 14))
extern uint32_t __attribute__((overloadable))
rsAtomicMin(volatile uint32_t* addr, uint32_t value);
#endif
#if (defined(RS_VERSION) && (RS_VERSION >= 14))
extern int32_t __attribute__((overloadable))
rsAtomicMin(volatile int32_t* addr, int32_t value);
#endif
/*
* rsAtomicOr: Thread-safe bitwise or
*
* Atomicly perform a bitwise or two values, storing the result at addr,
* i.e. *addr |= value.
*
* Parameters:
* addr: Address of the value to modify.
* value: Value to or with.
*
* Returns: Value of *addr prior to the operation.
*/
#if (defined(RS_VERSION) && (RS_VERSION >= 14))
extern int32_t __attribute__((overloadable))
rsAtomicOr(volatile int32_t* addr, int32_t value);
#endif
#if (defined(RS_VERSION) && (RS_VERSION >= 20))
extern int32_t __attribute__((overloadable))
rsAtomicOr(volatile uint32_t* addr, uint32_t value);
#endif
/*
* rsAtomicSub: Thread-safe subtraction
*
* Atomicly subtracts a value from the value at addr, i.e. *addr -= value.
*
* Parameters:
* addr: Address of the value to modify.
* value: Amount to subtract.
*
* Returns: Value of *addr prior to the operation.
*/
#if (defined(RS_VERSION) && (RS_VERSION >= 14))
extern int32_t __attribute__((overloadable))
rsAtomicSub(volatile int32_t* addr, int32_t value);
#endif
#if (defined(RS_VERSION) && (RS_VERSION >= 20))
extern int32_t __attribute__((overloadable))
rsAtomicSub(volatile uint32_t* addr, uint32_t value);
#endif
/*
* rsAtomicXor: Thread-safe bitwise exclusive or
*
* Atomicly performs a bitwise xor of two values, storing the result at addr,
* i.e. *addr ^= value.
*
* Parameters:
* addr: Address of the value to modify.
* value: Value to xor with.
*
* Returns: Value of *addr prior to the operation.
*/
#if (defined(RS_VERSION) && (RS_VERSION >= 14))
extern int32_t __attribute__((overloadable))
rsAtomicXor(volatile int32_t* addr, int32_t value);
#endif
#if (defined(RS_VERSION) && (RS_VERSION >= 20))
extern int32_t __attribute__((overloadable))
rsAtomicXor(volatile uint32_t* addr, uint32_t value);
#endif
#endif // RENDERSCRIPT_RS_ATOMIC_RSH
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