add infrastructure so that timing source can be a loadable module... next steps are to convert channel.c and chan_iax2.c to use this new API, and to move all the DAHDI-specific timing source code into a new res_timing_dahdi module

git-svn-id: http://svn.digium.com/svn/asterisk/trunk@122062 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 174 insertions, 0 deletions

diff --git a/main/timing.c b/main/timing.c
new file mode 100644
index 000000000..d87ebcc15
--- /dev/null
+++ b/main/timing.c
@@ -0,0 +1,174 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 2008, Digium, Inc.
+ *
+ * Kevin P. Fleming <kpfleming@digium.com>
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+/*! \file
+ *
+ * \brief Timing source management
+ *
+ * \author Kevin P. Fleming <kpfleming@digium.com>
+ */
+
+#include "asterisk.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+
+#include "asterisk/timing.h"
+#include "asterisk/lock.h"
+
+AST_MUTEX_DEFINE_STATIC(lock);
+
+static struct ast_timing_functions timer_funcs;
+
+void *ast_install_timing_functions(struct ast_timing_functions *funcs)
+{
+	if (!funcs->timer_open ||
+	    !funcs->timer_close ||
+	    !funcs->timer_ack ||
+	    !funcs->timer_get_event ||
+	    !funcs->timer_enable_continuous ||
+	    !funcs->timer_disable_continuous) {
+		return NULL;
+	}
+
+	ast_mutex_lock(&lock);
+
+	if (timer_funcs.timer_open) {
+		ast_mutex_unlock(&lock);
+		return NULL;
+	}
+	
+	timer_funcs = *funcs;
+
+	ast_mutex_unlock(&lock);
+
+	return &timer_funcs;
+}
+
+void ast_uninstall_timing_functions(void *handle)
+{
+	ast_mutex_lock(&lock);
+
+	if (handle != &timer_funcs) {
+		ast_mutex_unlock(&lock);
+		return;
+	}
+
+	memset(&timer_funcs, 0, sizeof(timer_funcs));
+
+	ast_mutex_unlock(&lock);
+}
+
+int ast_timer_open(unsigned int rate)
+{
+	int timer;
+
+	ast_mutex_lock(&lock);
+
+	if (!timer_funcs.timer_open) {
+		ast_mutex_unlock(&lock);
+		return -1;
+	}
+
+	timer = timer_funcs.timer_open(rate);
+
+	ast_mutex_unlock(&lock);
+
+	return timer;
+}
+
+void ast_timer_close(int timer)
+{
+	ast_mutex_lock(&lock);
+
+	if (!timer_funcs.timer_close) {
+		ast_mutex_unlock(&lock);
+		return;
+	}
+
+	timer_funcs.timer_close(timer);
+
+	ast_mutex_unlock(&lock);
+}
+
+void ast_timer_ack(int handle, unsigned int quantity)
+{
+	ast_mutex_lock(&lock);
+
+	if (!timer_funcs.timer_ack) {
+		ast_mutex_unlock(&lock);
+		return;
+	}
+
+	timer_funcs.timer_ack(handle, quantity);
+
+	ast_mutex_unlock(&lock);
+}
+
+int ast_timer_enable_continuous(int handle)
+{
+	int result;
+
+	ast_mutex_lock(&lock);
+
+	if (!timer_funcs.timer_enable_continuous) {
+		ast_mutex_unlock(&lock);
+		return -1;
+	}
+
+	result = timer_funcs.timer_enable_continuous(handle);
+
+	ast_mutex_unlock(&lock);
+
+	return result;
+}
+
+int ast_timer_disable_continous(int handle)
+{
+	int result;
+
+	ast_mutex_lock(&lock);
+
+	if (!timer_funcs.timer_disable_continuous) {
+		ast_mutex_unlock(&lock);
+		return -1;
+	}
+
+	result = timer_funcs.timer_disable_continuous(handle);
+
+	ast_mutex_unlock(&lock);
+
+	return result;
+}
+
+enum ast_timing_event ast_timer_get_event(int handle)
+{
+	enum ast_timing_event result;
+
+	ast_mutex_lock(&lock);
+
+	if (!timer_funcs.timer_get_event) {
+		ast_mutex_unlock(&lock);
+		return -1;
+	}
+
+	result = timer_funcs.timer_get_event(handle);
+
+	ast_mutex_unlock(&lock);
+
+	return result;
+}