thread/Cond: new wrapper for pthread_cond_t or GCond

Makefile.am

@@ -164,6 +164,9 @@ src_mpd_SOURCES = \
 	src/thread/Mutex.hxx \
 	src/thread/PosixMutex.hxx \
 	src/thread/GLibMutex.hxx \
+	src/thread/Cond.hxx \
+	src/thread/PosixCond.hxx \
+	src/thread/GLibCond.hxx \
 	src/glib_socket.h \
 	src/clock.c src/clock.h \
 	src/notify.c \

src/thread/Cond.hxx

+/*
+ * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_THREAD_COND_HXX
+#define MPD_THREAD_COND_HXX
+
+#ifdef WIN32
+
+/* mingw-w64 4.6.3 lacks a std::cond implementation */
+
+#include "GLibCond.hxx"
+typedef GLibCond Cond;
+
+#else
+
+#include "PosixCond.hxx"
+typedef PosixCond Cond;
+
+#endif
+
+#endif

src/thread/GLibCond.hxx

+/*
+ * Copyright (C) 2013 Max Kellermann <max@duempel.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+ * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef MPD_THREAD_GLIB_COND_HXX
+#define MPD_THREAD_GLIB_COND_HXX
+
+#include "GLibMutex.hxx"
+
+/**
+ * A wrapper for GCond.
+ */
+class GLibCond {
+#if GLIB_CHECK_VERSION(2,32,0)
+	GCond cond;
+#else
+	GCond *cond;
+#endif
+
+public:
+	GLibCond() {
+#if GLIB_CHECK_VERSION(2,32,0)
+		g_cond_init(&cond);
+#else
+		cond = g_cond_new();
+#endif
+	}
+
+	~GLibCond() {
+#if GLIB_CHECK_VERSION(2,32,0)
+		g_cond_clear(&cond);
+#else
+		g_cond_free(cond);
+#endif
+	}
+
+	GLibCond(const GLibCond &other) = delete;
+	GLibCond &operator=(const GLibCond &other) = delete;
+
+private:
+	GCond *GetNative() {
+#if GLIB_CHECK_VERSION(2,32,0)
+		return &cond;
+#else
+		return cond;
+#endif
+	}
+
+public:
+	void signal() {
+		g_cond_signal(GetNative());
+	}
+
+	void broadcast() {
+		g_cond_broadcast(GetNative());
+	}
+
+	void wait(GLibMutex &mutex) {
+		g_cond_wait(GetNative(), mutex.GetNative());
+	}
+};
+
+#endif

src/thread/GLibMutex.hxx

@@ -36,6 +36,8 @@
  * A wrapper for GMutex.
  */
 class GLibMutex {
+	friend class GLibCond;
+
 #if GLIB_CHECK_VERSION(2,32,0)
 	GMutex mutex;
 #else

src/thread/PosixCond.hxx

+/*
+ * Copyright (C) 2009-2013 Max Kellermann <max@duempel.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+ * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef MPD_THREAD_POSIX_COND_HXX
+#define MPD_THREAD_POSIX_COND_HXX
+
+#include "PosixMutex.hxx"
+
+/**
+ * Low-level wrapper for a pthread_cond_t.
+ */
+class PosixCond {
+	pthread_cond_t cond;
+
+public:
+	constexpr PosixCond():cond(PTHREAD_COND_INITIALIZER) {}
+
+	PosixCond(const PosixCond &other) = delete;
+	PosixCond &operator=(const PosixCond &other) = delete;
+
+	void signal() {
+		pthread_cond_signal(&cond);
+	}
+
+	void broadcast() {
+		pthread_cond_broadcast(&cond);
+	}
+
+	void wait(PosixMutex &mutex) {
+		pthread_cond_wait(&cond, &mutex.mutex);
+	}
+};
+
+#endif

src/thread/PosixMutex.hxx

@@ -36,6 +36,8 @@
  * Low-level wrapper for a pthread_mutex_t.
  */
 class PosixMutex {
+	friend class PosixCond;
+
 	pthread_mutex_t mutex;
 
 public: