问题
what does mean x and v in task creating or managing of free RTOS? xTaskcreate or vTaskcreate?
回答1:
The leading character(s) of the FreeRTOS functions identify the return type of the function. Functions that start with "v" return void. Functions that start with "x" typically return a result code or handle. See the Naming Conventions page of the FreeRTOS coding standard.
回答2:
Acording to FreeRTOS Documentation:
Variables of non stdint types are prefixed x. Examples include BaseType_t and TickType_t, which are portable layer defined typedefs for the natural or most efficient type for the architecture and the type used to hold the RTOS tick count respectively.
Variables of type size_t are also prefixed x.
API functions are prefixed with their return type, as per the convention defined for variables, with the addition of the prefix v for void.
In addition, the second part of the variable/function name, for example Task, indicates the file in which the variable/function implemented, i.e. task.c.
来源：https://stackoverflow.com/questions/32199690/what-is-v-and-x-means-in-freertos-task-creating-or-used-in-it