/**
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* \file
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*/
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#ifndef __MONO_UTILS_REFCOUNT_H__
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#define __MONO_UTILS_REFCOUNT_H__
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#include <glib.h>
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#include <config.h>
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#include "atomic.h"
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/*
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* Mechanism for ref-counting which tries to be as user-friendly as possible. Instead of being a wrapper around
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* user-provided data, it is embedded into the user data.
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*
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* This introduces some constraints on the MonoRefCount field:
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* - it needs to be called "ref"
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* - it cannot be a pointer
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*/
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typedef struct {
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guint32 ref;
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void (*destructor) (gpointer data);
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} MonoRefCount;
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#define mono_refcount_init(v,destructor) do { mono_refcount_initialize (&(v)->ref, (destructor)); } while (0)
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#define mono_refcount_inc(v) (mono_refcount_increment (&(v)->ref),(v))
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#define mono_refcount_tryinc(v) (mono_refcount_tryincrement (&(v)->ref))
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#define mono_refcount_dec(v) do { mono_refcount_decrement (&(v)->ref); } while (0)
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static inline void
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mono_refcount_initialize (MonoRefCount *refcount, void (*destructor) (gpointer data))
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{
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refcount->ref = 1;
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refcount->destructor = destructor;
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}
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static inline gboolean
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mono_refcount_tryincrement (MonoRefCount *refcount)
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{
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guint32 oldref, newref;
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g_assert (refcount);
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do {
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oldref = refcount->ref;
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if (oldref == 0)
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return FALSE;
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newref = oldref + 1;
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} while (mono_atomic_cas_i32 ((gint32*) &refcount->ref, (gint32)newref, (gint32)oldref) != (gint32)oldref);
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return TRUE;
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}
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static inline void
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mono_refcount_increment (MonoRefCount *refcount)
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{
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if (!mono_refcount_tryincrement (refcount))
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g_error ("%s: cannot increment a ref with value 0", __func__);
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}
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static inline void
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mono_refcount_decrement (MonoRefCount *refcount)
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{
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guint32 oldref, newref;
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g_assert (refcount);
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do {
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oldref = refcount->ref;
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if (oldref == 0)
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g_error ("%s: cannot decrement a ref with value 0", __func__);
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newref = oldref - 1;
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} while (mono_atomic_cas_i32 ((gint32*) &refcount->ref, (gint32)newref, (gint32)oldref) != (gint32)oldref);
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if (newref == 0 && refcount->destructor)
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refcount->destructor ((gpointer) refcount);
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}
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#endif /* __MONO_UTILS_REFCOUNT_H__ */
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