refcount: convert to C++

Makefile.am

@@ -99,7 +99,6 @@ mpd_headers = \
 	src/poison.h \
 	src/riff.h \
 	src/aiff.h \
-	src/refcount.h \
 	src/replay_gain_config.h \
 	src/replay_gain_info.h \
 	src/replay_gain_ape.h \
@@ -310,6 +309,7 @@ endif
 # Generic utility library
 
 libutil_a_SOURCES = \
+	src/util/RefCount.hxx \
 	src/util/fifo_buffer.c src/util/fifo_buffer.h \
 	src/util/growing_fifo.c src/util/growing_fifo.h \
 	src/util/LazyRandomEngine.cxx src/util/LazyRandomEngine.hxx \

src/archive/Bzip2ArchivePlugin.cxx

@@ -29,7 +29,7 @@
 #include "InputInternal.hxx"
 #include "InputStream.hxx"
 #include "InputPlugin.hxx"
-#include "refcount.h"
+#include "util/RefCount.hxx"
 
 #include <stdint.h>
 #include <stddef.h>
@@ -45,18 +45,17 @@
 struct Bzip2ArchiveFile {
 	struct archive_file base;
 
-	struct refcount ref;
+	RefCount ref;
 
 	char *name;
 	struct input_stream *istream;
 
 	Bzip2ArchiveFile() {
 		archive_file_init(&base, &bz2_archive_plugin);
-		refcount_init(&ref);
 	}
 
 	void Unref() {
-		if (!refcount_dec(&ref))
+		if (!ref.Decrement())
 			return;
 
 		g_free(name);
@@ -174,7 +173,7 @@ Bzip2InputStream::Bzip2InputStream(Bzip2ArchiveFile &_context, const char *uri,
 	:base(bz2_inputplugin, uri, mutex, cond),
 	 archive(&_context), eof(false)
 {
-	refcount_inc(&archive->ref);
+	archive->ref.Increment();
 }
 
 Bzip2InputStream::~Bzip2InputStream()

src/archive/Iso9660ArchivePlugin.cxx

@@ -29,7 +29,7 @@
 #include "InputInternal.hxx"
 #include "InputStream.hxx"
 #include "InputPlugin.hxx"
-#include "refcount.h"
+#include "util/RefCount.hxx"
 
 #include <cdio/cdio.h>
 #include <cdio/iso9660.h>
@@ -44,14 +44,13 @@
 struct Iso9660ArchiveFile {
 	struct archive_file base;
 
-	struct refcount ref;
+	RefCount ref;
 
 	iso9660_t *iso;
 
 	Iso9660ArchiveFile(iso9660_t *_iso)
 		:iso(_iso) {
 		archive_file_init(&base, &iso9660_archive_plugin);
-		refcount_init(&ref);
 	}
 
 	~Iso9660ArchiveFile() {
@@ -59,7 +58,7 @@ struct Iso9660ArchiveFile {
 	}
 
 	void Unref() {
-		if (refcount_dec(&ref))
+		if (ref.Decrement())
 			delete this;
 	}
 
@@ -161,7 +160,7 @@ struct Iso9660InputStream {
 		base.ready = true;
 		base.size = statbuf->size;
 
-		refcount_inc(&archive->ref);
+		archive->ref.Increment();
 	}
 
 	~Iso9660InputStream() {

src/archive/ZzipArchivePlugin.cxx

@@ -29,7 +29,7 @@
 #include "InputInternal.hxx"
 #include "InputStream.hxx"
 #include "InputPlugin.hxx"
-#include "refcount.h"
+#include "util/RefCount.hxx"
 
 #include <zzip/zzip.h>
 #include <glib.h>
@@ -38,17 +38,16 @@
 struct ZzipArchiveFile {
 	struct archive_file base;
 
-	struct refcount ref;
+	RefCount ref;
 
 	ZZIP_DIR *dir;
 
 	ZzipArchiveFile() {
 		archive_file_init(&base, &zzip_archive_plugin);
-		refcount_init(&ref);
 	}
 
 	void Unref() {
-		if (!refcount_dec(&ref))
+		if (!ref.Decrement())
 			return;
 
 		//close archive
@@ -136,7 +135,7 @@ struct ZzipInputStream {
 		zzip_file_stat(file, &z_stat);
 		base.size = z_stat.st_size;
 
-		refcount_inc(&archive->ref);
+		archive->ref.Increment();
 	}
 
 	~ZzipInputStream() {

src/input/CdioParanoiaInputPlugin.cxx

@@ -26,7 +26,6 @@
 #include "InputInternal.hxx"
 #include "InputStream.hxx"
 #include "InputPlugin.hxx"
-#include "refcount.h"
 
 #include <stdio.h>
 #include <stdint.h>

src/util/RefCount.hxx

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2011 The Music Player Daemon Project
+ * Copyright (C) 2003-2013 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * Redistribution and use in source and binary forms, with or without
@@ -33,35 +33,27 @@
  * A very simple reference counting library.
  */
 
-#ifndef MPD_REFCOUNT_H
-#define MPD_REFCOUNT_H
+#ifndef MPD_REFCOUNT_HXX
+#define MPD_REFCOUNT_HXX
 
-#include <glib.h>
-#include <stdbool.h>
+#include <atomic>
 
-struct refcount {
-	gint n;
+class RefCount {
+	std::atomic_uint n;
+
+public:
+	constexpr RefCount():n(1) {}
+
+	void Increment() {
+		++n;
+	}
+
+	/**
+	 * @return true if the number of references has been dropped to 0
+	 */
+	bool Decrement() {
+		return --n == 0;
+	}
 };
 
-static inline void
-refcount_init(struct refcount *r)
-{
-	r->n = 1;
-}
-
-static inline void
-refcount_inc(struct refcount *r)
-{
-	g_atomic_int_inc(&r->n);
-}
-
-/**
- * @return true if the number of references has been dropped to 0
- */
-static inline bool
-refcount_dec(struct refcount *r)
-{
-	return g_atomic_int_dec_and_test(&r->n);
-}
-
 #endif