RTT例程練習 2 7 郵箱 mailbox

郵箱是作業系統中，乙個程序給另乙個程序傳送訊息的方式。在裸奔的微控制器中，在兩個函式中交換資訊的時候，我們通常選擇最簡便的方式-全域性變數，這種程式設計模式無疑是降低了安全性和可靠性。再且，郵箱還能起到掛起執行緒的作用。

本實驗中建立乙個郵箱，兩個執行緒，執行緒2以一定週期傳送郵箱，執行緒1以一定週期從郵箱中取出郵件。當執行緒2中傳送20封郵件之後，傳送一封特殊的郵件通知其他執行緒，自己已經執行結束。執行緒1取出郵件後，檢查郵件是否是特殊郵件，如果是，則執行緒1也退出。

程式：

#include void rt_init_thread_entry(void *parameter)
static struct rt_mailbox mb;
static rt_uint8_t mb_pool[128];
static rt_uint8_t mb_str1 = "i'm a mail!";
static rt_uint8_t mb_str2 = "this is another mail!";
static rt_uint8_t mb_str3 = "over!";
static rt_uint8_t thread1_stack[1024];
struct rt_thread thread1;
static void thread1_entry(void *parameter)
}rt_mb_detach(&mb);
}static rt_uint8_t thread2_stack[1024];
struct rt_thread thread2;
static void thread2_entry(void *parameter)
else
rt_thread_delay(20);
}rt_mb_send(&mb, (rt_uint32_t)&mb_str3[0]);
}    
init_thread = rt_thread_create("init",
rt_init_thread_entry, rt_null,
2048,
8, 20);
if (init_thread != rt_null)
rt_thread_startup(init_thread);
rt_thread_init(&thread1,
"thread1",
thread1_entry,
rt_null,
&thread1_stack[0],
sizeof(thread1_stack),10,5);
rt_thread_startup(&thread1);
rt_thread_init(&thread2,
"thread2",
thread2_entry,
rt_null,
&thread2_stack[0],
sizeof(thread2_stack),10,5);
rt_thread_startup(&thread2);
return 0;
}

結果

thread1: try to recv a mail thread1: get a mail from mailbox, the content:i'm a mail! thread1: try to recv a mail thread1: get a mail from mailbox, the content:this is another mail! thread1: try to recv a mail thread1: get a mail from mailbox, the content:i'm a mail! thread1: try to recv a mail thread1: get a mail from mailbox, the content:this is another mail! thread1: try to recv a mail thread1: get a mail from mailbox, the content:i'm a mail! thread1: try to recv a mail thread1: get a mail from mailbox, the content:this is another mail! thread1: try to recv a mail thread1: get a mail from mailbox, the content:i'm a mail! thread1: try to recv a mail thread1: get a mail from mailbox, the content:this is another mail! thread1: try to recv a mail thread1: get a mail from mailbox, the content:i'm a mail! thread1: try to recv a mail thread1: get a mail from mailbox, the content:this is another mail! thread1: try to recv a mail

thread1: get a mail from mailbox, the content:over

RTT例程練習 2 7 郵箱 mailbox

RTT例程練習 1 3 執行緒讓出

RTT例程練習 1 3 執行緒讓出

RTT例程練習 1 1 動態執行緒建立，刪除

RTT例程練習 2 7 郵箱 mailbox

RTT例程練習 1 3 執行緒讓出

RTT例程練習 1 3 執行緒讓出

RTT例程練習 1 1 動態執行緒建立，刪除

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