C51: Non-reentrant PRINTF

Information in this article applies to:

• C51 Version 5.50

QUESTION

Is the printf() in the library reentrant or an ordinary routine? If it is a reentrant routine, is there a non-reentrant printf()?

ANSWER

printf() is non-reentrant. Caution must therefore be used when calling printf() in an ISR or other situations where printf() may be invoked while it is already executing.

MORE INFORMATION

• Refer to Stream I/O Routines in the Cx51 User's Guide.

SEE ALSO

• C51: Calling Printf In An Interrupt
• RTX51: Calling PRINTF From Multiple Tasks

Last Reviewed: Thursday, February 25, 2021