Risc-v-qemu-virt in FreeRTOS_ Scheduling opportunity of GCC

 At present, a total of the following two exceptions will be switched  
	timer 
	ecall 

timer

Source/portable/GCC/RISC-V/portASM.S
	handle_asynchronous:
		test_if_mtimer
			jal xTaskIncrementTick
			 flow 1 :
				beqz a0, processed_source //  No scheduling , immediate withdrawal 
			 flow 2:
				jal vTaskSwitchContext
				j processed_source

ecall

We from here Can see freertos Realized Two anomalies ecall and mtimer

We from here Of "ecall After freertos_risc_v_trap_handler" Can see ecall Then it happened Switch

 When will that be   Will switch  ?  call  portYIELD When