zephyr/zephyr_getchar: Explicitly yield to other threads on char availability.

pfalcon · pfalcon · commit 58168c8e6bcf · 2017-04-04T17:14:53.000+03:00
Without this, if there's a large chunk of data coming from hardware (e.g.
clipboard paste, or fed programmatically from the other side of the console),
there's a behavior of initial mass fill-in of the buffer without any
consumption, which starts much later and doesn't catch up with further
filling, leading to buffer overflow.
diff --git a/zephyr/src/zephyr_getchar.c b/zephyr/src/zephyr_getchar.c
@@ -44,6 +44,7 @@ static int console_irq_input_hook(uint8_t ch)
     }
     //printk("%x\n", ch);
     k_sem_give(&uart_sem);
+    k_yield();
     return 1;
 }
 

Original file line number	Diff line number	Diff line change
`@@ -44,6 +44,7 @@ static int console_irq_input_hook(uint8_t ch)`
`44`	`44`	`}`
`45`	`45`	`//printk("%x\n", ch);`
`46`	`46`	`k_sem_give(&uart_sem);`
	`47`	`+ k_yield();`
`47`	`48`	`return 1;`
`48`	`49`	`}`
`49`	`50`