It is accomplished ...

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10 a95241bf-73f2-0310-859d-f6bbb57e9c96
2002-07-09 12:24:59 +00:00
commit 52a3801208
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+#ifndef _KERNEL_ATOMIC_H
+#define _KERNEL_ATOMIC_H
+
+/**
+ * @file kernel/atomic.h
+ * @brief Prototypes for kernel and user versions of atomic
+ *  functions.
+ */
+
+/**
+ * @defgroup Kernel_Atomic Atomic Operations
+ * @ingroup OpenBeOS_Kernel
+ * @{
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif 
+
+/* XXX - atomic_set is defined as using a volatile as this stops a 
+ * compiler warning, but is there any reason why they shouldn't all
+ * be so defined? They were in arch/cpu.h...
+ */
+/**
+ * Perform an atomic addition.
+ * @param val Pointer to an integer
+ * @param incr The increment to add (may be -ve)
+ * @note Returns value of val before addition
+ */
+int atomic_add(int *val, int incr);
+/**
+ * Atomic and operation
+ * @param val Pointer to an integer
+ * @param incr The increment to add (may be -ve)
+ * @note Returns value of val before addition
+ */
+int atomic_and(int *val, int incr);
+/**
+ * Atomic or operation
+ * @param val Pointer to an integer
+ * @param incr The increment to add (may be -ve)
+ * @note Returns value of val before addition
+ */
+int atomic_or(int *val, int incr);
+int atomic_set(volatile int *val, int set_to);
+/* Compare the value of val with test_val. If they
+ * are equal then set the value of 'val' to
+ * 'set_to'
+ */
+int test_and_set(int *val, int set_to, int test_val);
+
+/**
+ * Atomic add (user version)
+ * @param val Pointer to an integer
+ * @param incr The increment to add (may be -ve)
+ * @note Returns value of val before addition
+ */
+int user_atomic_add(int *val, int incr);
+/**
+ * Atomic and (user version)
+ * @param val Pointer to an integer
+ * @param incr The increment to add (may be -ve)
+ * @note Returns value of val before addition
+ */
+int user_atomic_and(int *val, int incr);
+/**
+ * Atomic or (user version)
+ * @param val Pointer to an integer
+ * @param incr The increment to add (may be -ve)
+ * @note Returns value of val before addition
+ */
+int user_atomic_or(int *val, int incr);
+int user_atomic_set(int *val, int set_to);
+/* Compare the value of val with test_val. If they
+ * are equal then set the value of 'val' to
+ * 'set_to'
+ * @note This is the user version and should not be used within
+ *       the kernel.
+ */
+int user_test_and_set(int *val, int set_to, int test_val);
+
+#ifdef __cplusplus
+}
+#endif 
+/** @} */
+
+#endif /* _KERNEL_ATOMIC_H */