diff options
| author | bernard.xiong <[email protected]> | 2010-03-20 15:15:54 +0000 |
|---|---|---|
| committer | bernard.xiong <[email protected]> | 2010-03-20 15:15:54 +0000 |
| commit | 911d17912560a274f1faef33a09882406ab5190a (patch) | |
| tree | f330f3b0ba74d701cf8cc913ee231ce0e108b039 /examples/kernel/thread_delete.c | |
| parent | dd7cbec8d9f5e405b429dd1e76bd352022d9a0fa (diff) | |
add more thread example and Chinese comments.
git-svn-id: https://rt-thread.googlecode.com/svn/trunk@519 bbd45198-f89e-11dd-88c7-29a3b14d5316
Diffstat (limited to 'examples/kernel/thread_delete.c')
| -rw-r--r-- | examples/kernel/thread_delete.c | 45 |
1 files changed, 37 insertions, 8 deletions
diff --git a/examples/kernel/thread_delete.c b/examples/kernel/thread_delete.c index cd632815c4..0cd62390c5 100644 --- a/examples/kernel/thread_delete.c +++ b/examples/kernel/thread_delete.c @@ -1,43 +1,72 @@ +/*
+ * 程序清单：删除线程
+ *
+ * 这个例子会创建两个线程，在其中一个线程中删除另外一个线程。
+ */
#include <rtthread.h>
#include "tc_comm.h"
/*
- * This is an example for dynamic thread
+ * 线程删除(rt_thread_delete)函数仅适合于动态线程，为了在一个线程
+ * 中访问另一个线程的控制块，所以把线程块指针声明成全局类型以供全
+ * 局访问
*/
static rt_thread_t tid1 = RT_NULL, tid2 = RT_NULL;
+/* 线程1的入口函数 */
static void thread1_entry(void* parameter)
{
rt_uint32_t count = 0;
while (1)
{
+ /* 线程1采用低优先级运行，一直打印计数值 */
rt_kprintf("thread count: %d\n", count ++);
}
}
+/* 线程2的入口函数 */
static void thread2_entry(void* parameter)
{
+ /* 线程2拥有较高的优先级，以抢占线程1而获得执行 */
+
+ /* 线程2启动后先睡眠10个OS Tick */
rt_thread_delay(10);
+
+ /*
+ * 线程2唤醒后直接删除线程1，删除线程1后，线程1自动脱离就绪线程
+ * 队列
+ */
rt_thread_delete(tid1);
- /* delay thread2 to switch to idle thread */
+ /*
+ * 线程2继续休眠10个OS Tick然后退出，线程2休眠后应切换到idle线程
+ * idle线程将执行真正的线程1控制块和线程栈的删除
+ */
rt_thread_delay(10);
+
+ /*
+ * 线程2运行结束后也将自动被删除(线程控制块和线程栈依然在idle线
+ * 程中释放)
+ */
}
+/* 线程删除示例的初始化 */
int thread_delete_init()
{
- tid1 = rt_thread_create("t1",
- thread1_entry, (void*)1,
+ /* 创建线程1 */
+ tid1 = rt_thread_create("t1", /* 线程1的名称是t1 */
+ thread1_entry, RT_NULL, /* 入口时thread1_entry，参数是RT_NULL */
THREAD_STACK_SIZE, THREAD_PRIORITY, THREAD_TIMESLICE);
- if (tid1 != RT_NULL)
+ if (tid1 != RT_NULL) /* 如果获得线程控制块，启动这个线程 */
rt_thread_startup(tid1);
else
tc_stat(TC_STAT_END | TC_STAT_FAILED);
- tid2 = rt_thread_create("t2",
- thread2_entry, (void*)2,
+ /* 创建线程1 */
+ tid2 = rt_thread_create("t2", /* 线程1的名称是t2 */
+ thread2_entry, RT_NULL, /* 入口时thread2_entry，参数是RT_NULL */
THREAD_STACK_SIZE, THREAD_PRIORITY - 1, THREAD_TIMESLICE);
- if (tid2 != RT_NULL)
+ if (tid2 != RT_NULL) /* 如果获得线程控制块，启动这个线程 */
rt_thread_startup(tid2);
else
tc_stat(TC_STAT_END | TC_STAT_FAILED);
|