/* 线程1入口 */ static void thread1_entry(void* parameter) { int i; char *block; while(1) { for (i = 0; i < 48; i++) { /* 申请内存块 */ rt_kprintf("allocate No.%d\n", i); if (ptr[i] == RT_NULL) { ptr[i] = rt_mp_alloc(&mp, RT_WAITING_FOREVER); } } /* 继续申请一个内存块,因为已经没有内存块,线程应该被挂起 */ block = rt_mp_alloc(&mp, RT_WAITING_FOREVER); rt_kprintf("allocate the block mem\n"); /* 释放这个内存块 */ rt_mp_free(block); block = RT_NULL; } }
void* sbuf_alloc() { if (is_inited == RT_FALSE) { sbuf_init(); is_inited = RT_TRUE; } return (rt_uint16_t*)rt_mp_alloc(&_mp, RT_WAITING_FOREVER); }
rt_err_t rt_prio_queue_push(struct rt_prio_queue *que, rt_uint8_t prio, void *data, rt_int32_t timeout) { rt_ubase_t level; struct rt_prio_queue_item *item; RT_ASSERT(que); if (prio >= RT_PRIO_QUEUE_PRIO_MAX) return -RT_ERROR; item = rt_mp_alloc(&que->pool, timeout); if (item == RT_NULL) return -RT_ENOMEM; rt_memcpy(item+1, data, que->item_sz); item->next = RT_NULL; level = rt_hw_interrupt_disable(); _do_push(que, prio, item); if (!rt_list_isempty(&(que->suspended_pop_list))) { rt_thread_t thread; /* get thread entry */ thread = rt_list_entry(que->suspended_pop_list.next, struct rt_thread, tlist); /* resume it */ rt_thread_resume(thread); rt_hw_interrupt_enable(level); /* perform a schedule */ rt_schedule(); return RT_EOK; }
/// Allocate a memory block from a memory pool void *osPoolAlloc(osPoolId pool_id) { return rt_mp_alloc(pool_id, 0); }
static rt_size_t rt_serial_write (rt_device_t dev, rt_off_t pos, const void* buffer, rt_size_t size) { rt_uint8_t* ptr; rt_err_t err_code; struct stm32_serial_device* uart; err_code = RT_EOK; ptr = (rt_uint8_t*)buffer; uart = (struct stm32_serial_device*)dev->user_data; if (dev->flag & RT_DEVICE_FLAG_INT_TX) { /* interrupt mode Tx, does not support */ RT_ASSERT(0); } else if (dev->flag & RT_DEVICE_FLAG_DMA_TX) { /* DMA mode Tx */ /* allocate a data node */ struct stm32_serial_data_node* data_node = (struct stm32_serial_data_node*) rt_mp_alloc (&(uart->dma_tx->data_node_mp), RT_WAITING_FOREVER); if (data_node == RT_NULL) { /* set error code */ err_code = -RT_ENOMEM; } else { rt_uint32_t level; /* fill data node */ data_node->data_ptr = ptr; data_node->data_size = size; /* insert to data link */ data_node->next = RT_NULL; /* disable interrupt */ level = rt_hw_interrupt_disable(); data_node->prev = uart->dma_tx->list_tail; if (uart->dma_tx->list_tail != RT_NULL) uart->dma_tx->list_tail->next = data_node; uart->dma_tx->list_tail = data_node; if (uart->dma_tx->list_head == RT_NULL) { /* start DMA to transmit data */ uart->dma_tx->list_head = data_node; /* Enable DMA Channel */ rt_serial_enable_dma(uart->dma_tx->dma_channel, (rt_uint32_t)uart->dma_tx->list_head->data_ptr, uart->dma_tx->list_head->data_size); } /* enable interrupt */ rt_hw_interrupt_enable(level); } } else { /* polling mode */ if (dev->flag & RT_DEVICE_FLAG_STREAM) { /* stream mode */ while (size) { if (*ptr == '\n') { while (!(uart->uart_device->SR & USART_FLAG_TXE)); uart->uart_device->DR = '\r'; } while (!(uart->uart_device->SR & USART_FLAG_TXE)); uart->uart_device->DR = (*ptr & 0x1FF); ++ptr; --size; } } else { /* write data directly */ while (size) { while (!(uart->uart_device->SR & USART_FLAG_TXE)); uart->uart_device->DR = (*ptr & 0x1FF); ++ptr; --size; } } } /* set error code */ rt_set_errno(err_code); return (rt_uint32_t)ptr - (rt_uint32_t)buffer; }