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/*This code is in RTOS environment*/
/*Title: The wretched alternative.*/
/*This is wrong version*/
 
/*This code invites semaphore bugs or shared-data bugs everywhere*/
 
// File: tmrtask.c
 
long int lSecondsToday;	//global variable
 
void vTimerTask(void){
	.
	.
	.
	GetSemaphore(SEMAPHORE_TIME_OF_DAY);	//this function is provided by RTOS vendor
	++lSecondsToday;
	if(lSecondsToday == 60 * 60 * 24){
		lSecondsToday = 0L;
	}
	GiveSemaphore(SEMAPHORE_TIME_OF_DAY);
	.
	.
	.
}
-----------------------------------------------------
// File: hacker.c
 
extern long int lSecondsToday;
 
void vHackerTask(void){
	.
	.
	.
	/*Hope he remembers to use the semaphore*/
	lDeadline = lSecondsToday + 1800L
	.
	.
	.
	/*Here, too*/
	if(lSecondsToday > 3600 * 12)
	.
	.
	.
}
-----------------------------------------------------
// File: junior.c
 
extern long int lSecondsToday;
 
void vJuniorProgrammerTask (void){
	.
	.
	.
	/*Hope junior remembers to use the semaphore here. too*/
	for(l = lSecondsToday; l < lSecondsToday + 10; ++l)
	.
	.
	.
}

prog.c: In function ‘vTimerTask’:
prog.c:12:2: error: expected expression before ‘.’ token
  .
  ^
prog.c:20:2: warning: implicit declaration of function ‘GiveSemaphore’ [-Wimplicit-function-declaration]
  GiveSemaphore(SEMAPHORE_TIME_OF_DAY);
  ^~~~~~~~~~~~~
prog.c:20:16: error: ‘SEMAPHORE_TIME_OF_DAY’ undeclared (first use in this function)
  GiveSemaphore(SEMAPHORE_TIME_OF_DAY);
                ^~~~~~~~~~~~~~~~~~~~~
prog.c:20:16: note: each undeclared identifier is reported only once for each function it appears in
prog.c:21:2: error: expected expression before ‘.’ token
  .
  ^
prog.c: At top level:
prog.c:25:1: error: expected identifier or ‘(’ before ‘--’ token
 -----------------------------------------------------
 ^~
prog.c: In function ‘vHackerTask’:
prog.c:31:2: error: expected expression before ‘.’ token
  .
  ^
prog.c: At top level:
prog.c:45:1: error: expected identifier or ‘(’ before ‘--’ token
 -----------------------------------------------------
 ^~
prog.c: In function ‘vJuniorProgrammerTask’:
prog.c:51:2: error: expected expression before ‘.’ token
  .
  ^

Standard output is empty