修正rt_mp_free有可能唤醒一个错误任务指针的问题

components/finsh/cmd.c

@@ -675,6 +675,8 @@ long list_mempool(void)
             {
                 struct rt_object *obj;
                 struct rt_mempool *mp;
+                int suspend_thread_count;
+                rt_list_t *node;
 
                 obj = rt_list_entry(obj_list[i], struct rt_object, list);
                 level = rt_hw_interrupt_disable();
@@ -687,7 +689,14 @@ long list_mempool(void)
                 rt_hw_interrupt_enable(level);
 
                 mp = (struct rt_mempool *)obj;
-                if (mp->suspend_thread_count > 0)
+
+                suspend_thread_count = 0;
+                for (node = mp->suspend_thread.next; node != &mp->suspend_thread; node = node->next)
+                {
+                    suspend_thread_count++;
+                }
+
+                if (suspend_thread_count > 0)
                 {
                     rt_kprintf("%-*.*s %04d  %04d  %04d %d:",
                             maxlen, RT_NAME_MAX,
@@ -695,7 +704,7 @@ long list_mempool(void)
                             mp->block_size,
                             mp->block_total_count,
                             mp->block_free_count,
-                            mp->suspend_thread_count);
+                            suspend_thread_count);
                     show_wait_queue(&(mp->suspend_thread));
                     rt_kprintf("\n");
                 }
@@ -707,7 +716,7 @@ long list_mempool(void)
                             mp->block_size,
                             mp->block_total_count,
                             mp->block_free_count,
-                            mp->suspend_thread_count);
+                            suspend_thread_count);
                 }
             }
         }

include/rtdef.h

@@ -815,7 +815,6 @@ struct rt_mempool
     rt_size_t        block_free_count;                  /**< numbers of free memory block */
 
     rt_list_t        suspend_thread;                    /**< threads pended on this resource */
-    rt_size_t        suspend_thread_count;              /**< numbers of thread pended on this resource */
 };
 typedef struct rt_mempool *rt_mp_t;
 #endif

src/mempool.c

@@ -103,7 +103,6 @@ rt_err_t rt_mp_init(struct rt_mempool *mp,
 
     /* initialize suspended thread list */
     rt_list_init(&(mp->suspend_thread));
-    mp->suspend_thread_count = 0;
 
     /* initialize free block list */
     block_ptr = (rt_uint8_t *)mp->start_address;
@@ -157,9 +156,6 @@ rt_err_t rt_mp_detach(struct rt_mempool *mp)
          */
         rt_thread_resume(thread);
 
-        /* decrease suspended thread count */
-        mp->suspend_thread_count --;
-
         /* enable interrupt */
         rt_hw_interrupt_enable(temp);
     }
@@ -219,7 +215,6 @@ rt_mp_t rt_mp_create(const char *name,
 
     /* initialize suspended thread list */
     rt_list_init(&(mp->suspend_thread));
-    mp->suspend_thread_count = 0;
 
     /* initialize free block list */
     block_ptr = (rt_uint8_t *)mp->start_address;
@@ -275,9 +270,6 @@ rt_err_t rt_mp_delete(rt_mp_t mp)
          */
         rt_thread_resume(thread);
 
-        /* decrease suspended thread count */
-        mp->suspend_thread_count --;
-
         /* enable interrupt */
         rt_hw_interrupt_enable(temp);
     }
@@ -334,7 +326,6 @@ void *rt_mp_alloc(rt_mp_t mp, rt_int32_t time)
         /* need suspend thread */
         rt_thread_suspend(thread);
         rt_list_insert_after(&(mp->suspend_thread), &(thread->tlist));
-        mp->suspend_thread_count++;
 
         if (time > 0)
         {
@@ -418,7 +409,7 @@ void rt_mp_free(void *block)
     *block_ptr = mp->block_list;
     mp->block_list = (rt_uint8_t *)block_ptr;
 
-    if (mp->suspend_thread_count > 0)
+    if (!rt_list_isempty(&(mp->suspend_thread)))
     {
         /* get the suspended thread */
         thread = rt_list_entry(mp->suspend_thread.next,
@@ -431,9 +422,6 @@ void rt_mp_free(void *block)
         /* resume thread */
         rt_thread_resume(thread);
 
-        /* decrease suspended thread count */
-        mp->suspend_thread_count --;
-
         /* enable interrupt */
         rt_hw_interrupt_enable(level);