Reference Manual

  • 15.0
  • 07/23/2021
  • Public Content
Contents

Simulating Nonblocking I/O

QuickWin does not accept unsolicited input. You get beeps if you type into an active window if no
READ
or
GETCHARQQ
has been done. Because of this, it is necessary to do a
READGETCHARQQ
or in order for a character to be accepted. But this type of blocking I/O puts the program to sleep until a character has been typed.
In Fortran Console applications,
PEEKCHARQQ
can be used to see if a character has already been typed. However,
PEEKCHARQQ
does not work under Fortran QuickWin applications, since QuickWin has no console buffer to accept unsolicited input. Because of this limitation,
PEEKCHARQQc
annot be used as it is with Fortran Console applications to see whether a character has already been typed.
One way to simulate
PEEKCHARQQ
with QuickWin applications is to add an additional thread:
  • One thread does a
    READGETCHARQQ
    or and is blocked until a character typed.
  • The other thread (the main program) is in a loop doing useful work and checking in the loop to see if the other thread has received input.

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.