A first test of workqueues.

They've changed significantly since LDDv3.

diff --git a/workqueue/Makefile b/workqueue/Makefile
new file mode 100644 (file)
index 0000000..f2266eb
--- /dev/null
+++ b/workqueue/Makefile
@@ -0,0 +1,12 @@
+ifneq ($(KERNELRELEASE),)
+       obj-m := wq.o
+else
+       KERNELDIR ?= /lib/modules/$(shell uname -r)/build
+       PWD := $(shell pwd)
+
+default:
+       $(MAKE) -C $(KERNELDIR) M=$(PWD) modules
+
+clean:
+       $(MAKE) -C $(KERNELDIR) M=$(PWD) clean
+endif

diff --git a/workqueue/wq.c b/workqueue/wq.c
new file mode 100644 (file)
index 0000000..1d5fe38
--- /dev/null
+++ b/workqueue/wq.c
@@ -0,0 +1,49 @@
+/*
+ *  Copyright (C) 2009  Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
+ *
+ *  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.
+ */
+
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/workqueue.h>
+
+MODULE_LICENSE("GPL");
+
+static void do_mywork(struct work_struct *data)
+{
+       printk(KERN_INFO "I've been scheduled.\n");
+}
+
+DECLARE_DELAYED_WORK(mywork, do_mywork);
+static struct workqueue_struct *mywq;
+
+static int mywq_init(void)
+{
+       mywq = create_workqueue("mywq");
+       printk(KERN_INFO "Here I am, this is me.\n");
+       queue_delayed_work(mywq, &mywork, 8 * HZ);
+       return 0;
+}
+
+static void mywq_exit(void)
+{
+       flush_workqueue(mywq);
+       destroy_workqueue(mywq);
+}
+
+module_init(mywq_init);
+module_exit(mywq_exit);