52a3801208
git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10 a95241bf-73f2-0310-859d-f6bbb57e9c96
88 lines
2.2 KiB
C
Executable File
88 lines
2.2 KiB
C
Executable File
#ifndef _KERNEL_ATOMIC_H
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#define _KERNEL_ATOMIC_H
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/**
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* @file kernel/atomic.h
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* @brief Prototypes for kernel and user versions of atomic
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* functions.
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*/
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/**
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* @defgroup Kernel_Atomic Atomic Operations
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* @ingroup OpenBeOS_Kernel
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* @{
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* XXX - atomic_set is defined as using a volatile as this stops a
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* compiler warning, but is there any reason why they shouldn't all
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* be so defined? They were in arch/cpu.h...
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*/
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/**
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* Perform an atomic addition.
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* @param val Pointer to an integer
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* @param incr The increment to add (may be -ve)
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* @note Returns value of val before addition
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*/
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int atomic_add(int *val, int incr);
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/**
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* Atomic and operation
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* @param val Pointer to an integer
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* @param incr The increment to add (may be -ve)
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* @note Returns value of val before addition
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*/
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int atomic_and(int *val, int incr);
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/**
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* Atomic or operation
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* @param val Pointer to an integer
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* @param incr The increment to add (may be -ve)
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* @note Returns value of val before addition
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*/
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int atomic_or(int *val, int incr);
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int atomic_set(volatile int *val, int set_to);
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/* Compare the value of val with test_val. If they
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* are equal then set the value of 'val' to
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* 'set_to'
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*/
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int test_and_set(int *val, int set_to, int test_val);
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/**
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* Atomic add (user version)
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* @param val Pointer to an integer
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* @param incr The increment to add (may be -ve)
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* @note Returns value of val before addition
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*/
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int user_atomic_add(int *val, int incr);
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/**
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* Atomic and (user version)
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* @param val Pointer to an integer
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* @param incr The increment to add (may be -ve)
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* @note Returns value of val before addition
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*/
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int user_atomic_and(int *val, int incr);
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/**
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* Atomic or (user version)
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* @param val Pointer to an integer
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* @param incr The increment to add (may be -ve)
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* @note Returns value of val before addition
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*/
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int user_atomic_or(int *val, int incr);
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int user_atomic_set(int *val, int set_to);
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/* Compare the value of val with test_val. If they
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* are equal then set the value of 'val' to
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* 'set_to'
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* @note This is the user version and should not be used within
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* the kernel.
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*/
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int user_test_and_set(int *val, int set_to, int test_val);
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#ifdef __cplusplus
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}
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#endif
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/** @} */
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#endif /* _KERNEL_ATOMIC_H */
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