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threadx 线程以及优先级调整案例

news 来源：原创 2024/9/20 1:25:25

以正点原子stm32 f407板子为例子，如何创建工程 CubeMX+CubeIDE在我之前的文章里提到了，这里我就不多重复。

有关线程优先级的两个参数 priority和preemption，我们来看看在官网是如何定义的

在main.c里面添加一个printf转串口的代码，这样我们用printf就可以直接转发到串口，我在之前用CubeMX设置的是串口1，用的是PA9和PA10，所以这里也设置的是huart1

/* USER CODE BEGIN PTD */
#if defined ( __GNUC__) && !defined(__clang__)
/* With GCC, small printf (option LD Linker->Libraries->Small printfset to 'Yes') calls __io_putchar() */
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif /* __GNUC__ */
/* USER CODE END PTD *//* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
PUTCHAR_PROTOTYPE{HAL_UART_Transmit(&huart1, (uint8_t *)&ch,1,0xFFFF);return ch;}
/* USER CODE END PD */

接下来我们在Core里面新建一个threadTest的文件夹，写上hey.c和hey.h两个文件

把这个文件夹添加到路径下

hey.h

#include "tx_api.h"
#include "main.h"
#include "stdio.h"
void processHey(VOID *memory_ptr);

hey.c

/** hey.c**  Created on: Jul 14, 2024*      Author: liqun*/#include "hey.h"
TX_THREAD Hey;
UINT OldPriority;
static VOID hey_entry(ULONG thread_input);
void processHey(VOID *memory_ptr){TX_BYTE_POOL *byte_pool = (TX_BYTE_POOL*)memory_ptr;CHAR    *pointer;
//	pointer = malloc(1024);tx_byte_allocate(byte_pool, (VOID **) &pointer, 1024, TX_NO_WAIT);INT ret = tx_thread_create(&Hey,"hey thread",hey_entry,0,pointer,1024,1,1,TX_NO_TIME_SLICE,TX_AUTO_START);if(ret != TX_SUCCESS){printf("hey is not be created\n");}
}static VOID hey_entry(ULONG thread_input){printf("thread hey is starting\n");CHAR *name;UINT state;ULONG run_count;UINT priority;UINT preemption_threshold;UINT time_slice;TX_THREAD *next_thread;TX_THREAD *suspended_thread;UINT status;if(tx_thread_info_get(&Hey,&name,&state, &run_count,&priority, &preemption_threshold,&time_slice, &next_thread,&suspended_thread)==TX_SUCCESS){printf("Current Hey priority is %d \n",priority);}else{printf("get thread info failed\n");}if(tx_thread_priority_change(&Hey,10,&OldPriority)==TX_SUCCESS){printf("thread priority is changed from 1 to 10\n");if(tx_thread_info_get(&Hey,&name,&state, &run_count,&priority, &preemption_threshold,&time_slice, &next_thread,&suspended_thread)==TX_SUCCESS){printf("Current Hey priority is %d \n",priority);};}else{printf("thread priority is not changed\n");};
}

在hey.c里面，我们创建了一个线程，线程占用的栈大小为1024，指针为pointer，记得要初始化一下指针(我这里用的是threadx的方法，如果不想这么复杂，需要传入memory_ptr然后byte_pool的话，其实直接pointer = malloc(1024)也是可以运行的，就是自己要手动free)。在线程hey_enter里面，我们调用了tx_thread_info_get去获取当前线程的所有参数，然后我们用tx_thread_priority_change去修改线程的优先级。当然，如果需要修改线程的抢占，也是可以的，有tx_thread_preemption_change这个函数

然后在app_azure_rtos.c里引入hey.h头文件并调用