标签:32mI RTOS rtos 互斥 mutex HigPriorityTask MidPriorityTask 0m
互斥锁的作用:防止多个线程同时修改某个共享资源(全局变量)
优先级反转问题
xTaskCreate(LowPriorityTask, "LowPriorityTask", 4096, NULL, 2, LowPriorityTask_Handle);
xTaskCreate(MidPriorityTask, "MidPriorityTask", 4096, NULL, 3, MidPriorityTask_Handle);
xTaskCreate(HighPriorityTask, "HighPriorityTask", 4096, NULL, 4, HighPriorityTask_Handle);
static void HighPriorityTask(void *pvParameters)
{
BaseType_t ret = pdPASS;
while (1)
{
ESP_LOGI(TAG, "HigPriorityTask GET");
ret = xSemaphoreTake(MuxSem_Handle, portMAX_DELAY);
if (ret == pdPASS)
ESP_LOGI(TAG, "HigPriorityTask runing");
ESP_LOGI(TAG, "HigPriorityTask release");
xSemaphoreGive(MuxSem_Handle);
vTaskDelay(1000 / portTICK_RATE_MS);
}
}
static void MidPriorityTask(void *pvParameters)
{
while (1)
{
ESP_LOGI(TAG, "MidPriorityTask runing");
vTaskDelay(1000 / portTICK_RATE_MS);
}
}
static void LowPriorityTask(void *pvParameters)
{
BaseType_t ret = pdPASS;
while (1)
{
ret = xSemaphoreTake(MuxSem_Handle, portMAX_DELAY);
if (ret == pdPASS)
{
ESP_LOGI(TAG, "LowPriorityTask Get");
}
// HighPriorityTask 如果获取互斥锁将会被阻塞
// MidPriorityTask 可以抢占LowPriorityTask
vTaskDelay(2000 / portTICK_RATE_MS);
ESP_LOGI(TAG, "LowPriorityTask Release");
ret = xSemaphoreGive(MuxSem_Handle);
led_toggle();
vTaskDelay(1000 / portTICK_RATE_MS);
}
}
[0;32mI (238) rtos mutex: mutex start...[0m
[0;32mI (239) rtos mutex: MuxSem_Handle OK[0m
[0;32mI (240) rtos mutex: LowPriorityTask OK[0m
[0;32mI (242) rtos mutex: MidPriorityTask OK[0m
[0;32mI (248) rtos mutex: HighPriorityTask OK[0m
[0;32mI (255) rtos mutex: HigPriorityTask GET[0m
[0;32mI (262) rtos mutex: HigPriorityTask runing[0m
[0;32mI (269) rtos mutex: HigPriorityTask release[0m
[0;32mI (276) rtos mutex: MidPriorityTask runing[0m
[0;32mI (284) rtos mutex: LowPriorityTask Get[0m
[0;32mI (1275) rtos mutex: HigPriorityTask GET[0m
[0;32mI (1276) rtos mutex: MidPriorityTask runing[0m
[0;32mI (2276) rtos mutex: MidPriorityTask runing[0m
[0;32mI (2286) rtos mutex: LowPriorityTask Release[0m
[0;32mI (2287) rtos mutex: HigPriorityTask runing[0m
[0;32mI (2288) rtos mutex: HigPriorityTask release[0m
[0;32mI (3276) rtos mutex: MidPriorityTask runing[0m
[0;32mI (3286) rtos mutex: HigPriorityTask GET[0m
[0;32mI (3287) rtos mutex: HigPriorityTask runing[0m
[0;32mI (3288) rtos mutex: HigPriorityTask release[0m
[0;32mI (3292) rtos mutex: LowPriorityTask Get[0m
[0;32mI (4276) rtos mutex: MidPriorityTask runing[0m
[0;32mI (4286) rtos mutex: HigPriorityTask GET[0m
[0;32mI (5276) rtos mutex: MidPriorityTask runing[0m
[0;32mI (5296) rtos mutex: LowPriorityTask Release[0m
[0;32mI (5297) rtos mutex: HigPriorityTask runing[0m
标签:32mI,RTOS,rtos,互斥,mutex,HigPriorityTask,MidPriorityTask,0m 来源: https://blog.csdn.net/lzw508170827/article/details/121118882
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