75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/**
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* PROJECT: ExectOS
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* COPYRIGHT: See COPYING.md in the top level directory
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* FILE: xtoskrnl/rtl/intrin.c
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* DESCRIPTION: Interlocked operations support
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* DEVELOPERS: Rafal Kupiec <belliash@codingworkshop.eu.org>
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*/
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#include <xtos.h>
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/**
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* Performs an atomic compare exchange operation on the pointer value.
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*
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* @param Destination
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* Supplues a pointer to the variable for the compare exchange operation.
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*
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* @param Comperand
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* Supplies a pointer value used in compare operation.
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*
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* @param Exchange
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* Supplies a pointer value used in exchange operation.
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*
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* @return This routine returns the initial pointer value of the Destination parameter.
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*
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* @since XT 1.0
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*/
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XTFASTCALL
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PVOID
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RtlInterlockedCompareExchangePointer(IN VOLATILE PVOID *Destination,
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IN PVOID Comperand,
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IN PVOID Exchange)
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{
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return (PVOID)__sync_val_compare_and_swap(Destination, Comperand, Exchange);
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}
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/**
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* Performs an atomic decrement of the 32-bit or 64bit value, depending on architecture.
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*
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* @param Addend
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* Specifies a pointer to the variable to be decremented.
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*
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* @return This routine returns the decremented value.
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*
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* @since XT 1.0
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*/
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XTFASTCALL
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LONG_PTR
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RtlInterlockedDecrement64(IN VOLATILE PLONG_PTR Addend)
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{
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return (LONG_PTR)__sync_sub_and_fetch(Addend, 1);
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}
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/**
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* Performs an atomic assignment of the value to the pointer variable.
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*
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* @param Destination
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* Supplies a pointer to the variable to be set.
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*
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* @param Value
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* Supplies a value to set.
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*
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* @return This routine returns the initial value of the pointer variable.
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*
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* @since XT 1.0
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*/
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XTFASTCALL
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PVOID
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RtlInterlockedExchangePointer(IN VOLATILE PVOID *Destination,
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IN PVOID Value)
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{
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__sync_synchronize();
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return (void *)__sync_lock_test_and_set(Destination, Value);
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}
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