Add sleep(1) before exit call when printing

[skliper]

Is your feature request related to a problem? Please describe.
User reported OS_print doesn't display before exit, for example:

PSP/fsw/pc-linux/src/cfe_psp_memory.c

Lines 145 to 146 in 6d40816

	OS_printf("CFE_PSP: Cannot Create CDS Shared memory key!\n");
	exit(-1);

Describe the solution you'd like
Add sleep(1) between prints and exits to give it a chance

Describe alternatives you've considered
None

Additional context
None

Requester Info
Jacob Hageman - NASA/GSFC

[jphickey]

Similar/related issue to #203 (this is the symptom anyway). I may even have a patch/fix that was never merged for that issue already done somewhere from when I quickly looked at it.

Note that use of sleep system call is discouraged for new code as it may interfere with other timers. nanosleep (POSIX) or even OS_TaskDelay might be preferable.

[jbohren-hbr]

Would calling fflush(stdout) be adequate here instead of adding a sleep? ref

[paulober]

Ok, I now used the OS_TaskDelay since it's the implemented behaviour of the OSAL package but maybe I could use fflush(stdout) if someone who knows the project can give a short feedback on this. And if OS_TaskDelay is used maybe only 100 milliseconds are required because this value is already used in:

PSP/fsw/pc-linux/src/cfe_psp_start.c

Lines 468 to 474 in 6d40816

	/*
	* This happens if an unhandled exception occurs, or if the user presses CTRL+C
	*/
	OS_printf("\nCFE_PSP: Shutdown initiated - Exiting cFE\n");
	OS_TaskDelay(100);
	OS_DeleteAllObjects();