[libvirt] [PATCH v5 3/4] timer impl
Wen Congyang
wency at cn.fujitsu.com
Wed Jan 5 03:02:10 UTC 2011
* src/util/timer.c src/util/timer.h: timer implementation
* src/libvirt.c: Initialize timer
* src/Makefile.am: build timer
* src/libvirt_private.syms: Export public functions
Signed-off-by: Wen Congyang <wency at cn.fujitsu.com>
---
cfg.mk | 1 +
src/Makefile.am | 3 +-
src/libvirt.c | 2 +
src/libvirt_private.syms | 6 ++
src/util/timer.c | 158 ++++++++++++++++++++++++++++++++++++++++++++++
src/util/timer.h | 34 ++++++++++
6 files changed, 203 insertions(+), 1 deletions(-)
create mode 100644 src/util/timer.c
create mode 100644 src/util/timer.h
diff --git a/cfg.mk b/cfg.mk
index 03186b3..6909876 100644
--- a/cfg.mk
+++ b/cfg.mk
@@ -129,6 +129,7 @@ useless_free_options = \
--name=virStoragePoolSourceFree \
--name=virStorageVolDefFree \
--name=virThreadPoolFree \
+ --name=virTimerFree \
--name=xmlFree \
--name=xmlXPathFreeContext \
--name=xmlXPathFreeObject
diff --git a/src/Makefile.am b/src/Makefile.am
index c13724a..166a1b7 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -79,7 +79,8 @@ UTIL_SOURCES = \
util/util.c util/util.h \
util/xml.c util/xml.h \
util/virtaudit.c util/virtaudit.h \
- util/virterror.c util/virterror_internal.h
+ util/virterror.c util/virterror_internal.h \
+ util/timer.c util/timer.h
EXTRA_DIST += util/threads-pthread.c util/threads-win32.c
diff --git a/src/libvirt.c b/src/libvirt.c
index ee2495a..b938a60 100644
--- a/src/libvirt.c
+++ b/src/libvirt.c
@@ -40,6 +40,7 @@
#include "util.h"
#include "memory.h"
#include "configmake.h"
+#include "timer.h"
#ifndef WITH_DRIVER_MODULES
# ifdef WITH_TEST
@@ -332,6 +333,7 @@ virInitialize(void)
if (virThreadInitialize() < 0 ||
virErrorInitialize() < 0 ||
+ virTimerInitialize() < 0 ||
virRandomInitialize(time(NULL) ^ getpid()))
return -1;
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 08570ae..c222414 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -807,6 +807,12 @@ virThreadSelf;
virThreadSelfID;
+# timer.h
+virTimerNew;
+virSetTimeout;
+virTimerFree;
+
+
# usb.h
usbDeviceFileIterate;
usbDeviceGetBus;
diff --git a/src/util/timer.c b/src/util/timer.c
new file mode 100644
index 0000000..31d360a
--- /dev/null
+++ b/src/util/timer.c
@@ -0,0 +1,158 @@
+/*
+ * timer.c: timer functions
+ *
+ * Copyright (C) 2010, 2011 Fujitsu Limited
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Author: Wen Congyang <wency at cn.fujitsu.com>
+ */
+
+#include <config.h>
+
+#include "event.h"
+#include "memory.h"
+#include "threads.h"
+#include "timer.h"
+#include "virterror_internal.h"
+
+#define VIR_FROM_THIS VIR_FROM_NONE
+
+struct _virTimer {
+ int timer_id;
+
+ virTimerCallback function;
+ void *opaque;
+};
+
+/* use timerFunc to prevent the user know timer id. */
+static void timerFunc(int timer_id ATTRIBUTE_UNUSED, void *opaque)
+{
+ virTimerPtr timer = opaque;
+ timer->function(timer->opaque);
+}
+
+/**
+ * virTimerNew:
+ * @callback: the callback to call when timeout has expired
+ * @opaque: user data to pass to the callback
+ *
+ * Create a new timer object.
+ *
+ * Returns the poitner to new timer object, or NULL upon error
+ */
+virTimerPtr virTimerNew(virTimerCallback callback, void *opaque)
+{
+ virTimerPtr timer = NULL;
+
+ if (VIR_ALLOC(timer) < 0) {
+ virReportOOMError();
+ return NULL;
+ }
+
+ timer->timer_id = -1;
+ timer->function = callback;
+ timer->opaque = opaque;
+
+ return timer;
+}
+
+/**
+ * virSetTimeout:
+ * @timer: pointer to timer object
+ * @expire_time: the new timeout value(must be 0 or above)
+ *
+ * Alarm or disalarm the timer. When expire_time is more than 0, alarm the
+ * timer with the new timeout value. When expire_time is 0, disalarm the timer.
+ *
+ * Returns 0 in case of success or -1 in case of error.
+ */
+int virSetTimeout(virTimerPtr timer, int expire_time)
+{
+ if (expire_time < 0) {
+ /* expire_time is invalid */
+ return -1;
+ }
+
+ if (expire_time == 0) {
+ /* delete the timer */
+ if (timer->timer_id == -1)
+ return 0;
+
+ if (virEventRemoveTimeout(timer->timer_id) < 0)
+ return -1;
+
+ timer->timer_id = -1;
+ return 0;
+ }
+
+ if (timer->timer_id == -1) {
+ /* add new timer */
+ int ret;
+
+ if ((ret = virEventAddTimeout(expire_time, timerFunc,
+ timer, NULL)) < 0) {
+ return -1;
+ }
+ timer->timer_id = ret;
+ return 0;
+ }
+
+ /* update the timer */
+ virEventUpdateTimeout(timer->timer_id, expire_time);
+ return 0;
+}
+
+/**
+ * virTimerFree:
+ * @timer: pointer to timer object
+ *
+ * Free the associated timer object.
+ */
+void virTimerFree(virTimerPtr timer)
+{
+ if (!timer)
+ return;
+
+ VIR_FREE(timer);
+}
+
+static int timer_initialized = 0;
+static virThread timer_thread;
+static bool timer_quit = false;
+
+static void timerThreadFunc(void *opaque ATTRIBUTE_UNUSED)
+{
+ while(!timer_quit) {
+ virEventRunOnce();
+ }
+}
+
+/* This init function requires:
+ * 1. single-thread environment.
+ * 2. it must be called after virThreadInitialize().
+ */
+int virTimerInitialize(void)
+{
+ if (timer_initialized)
+ return 0;
+
+ if (virThreadCreate(&timer_thread, true, timerThreadFunc, NULL) < 0)
+ return -1;
+
+ timer_initialized = 1;
+ timer_quit = false;
+ return 0;
+}
diff --git a/src/util/timer.h b/src/util/timer.h
new file mode 100644
index 0000000..e5817a5
--- /dev/null
+++ b/src/util/timer.h
@@ -0,0 +1,34 @@
+/*
+ * timer.h: structure and entry points for timer support
+ *
+ * Copyright (C) 2010, 2011 Fujitsu Limited
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Author: Wen Congyang <wency at cn.fujitsu.com>
+ */
+
+#ifndef __VIR_TIMER_H__
+# define __VIR_TIMER_H__
+
+typedef struct _virTimer virTimer;
+typedef virTimer *virTimerPtr;
+typedef void (*virTimerCallback)(void *);
+
+extern virTimerPtr virTimerNew(virTimerCallback, void *);
+extern int virSetTimeout(virTimerPtr, int) ATTRIBUTE_NONNULL(1);
+extern void virTimerFree(virTimerPtr);
+extern int virTimerInitialize(void) ATTRIBUTE_RETURN_CHECK;
+#endif /* __VIR_TIMER_H__ */
--
1.7.1
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