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void IRQHandler() {
	if (cond) {
		xTaskNotifyGiveFromISR(task_handler, &xHigherPriorityTaskWoken);
	}
}
 
void func() {
	// Clear all pending notifications
	// while (ulTaskNotifyTake(pdTRUE, 0)){} works
	// xTaskNotifyStateClear(NULL) does not
	start(); // does something that eventually triggers an interrupt
	ulTaskNotifyTake(pdTRUE, pdMS_TO_TICKS(100));
	// continue
	// eventually a second interrupt may occurs and an unreceived notification is generated
}
 
void task(void* params) {
	for (;;) {
		func();
	}
}

prog.c: In function ‘IRQHandler’:
prog.c:2:6: error: ‘cond’ undeclared (first use in this function); did you mean ‘void’?
  if (cond) {
      ^~~~
      void
prog.c:2:6: note: each undeclared identifier is reported only once for each function it appears in
prog.c:3:3: warning: implicit declaration of function ‘xTaskNotifyGiveFromISR’ [-Wimplicit-function-declaration]
   xTaskNotifyGiveFromISR(task_handler, &xHigherPriorityTaskWoken);
   ^~~~~~~~~~~~~~~~~~~~~~
prog.c:3:26: error: ‘task_handler’ undeclared (first use in this function); did you mean ‘IRQHandler’?
   xTaskNotifyGiveFromISR(task_handler, &xHigherPriorityTaskWoken);
                          ^~~~~~~~~~~~
                          IRQHandler
prog.c:3:41: error: ‘xHigherPriorityTaskWoken’ undeclared (first use in this function)
   xTaskNotifyGiveFromISR(task_handler, &xHigherPriorityTaskWoken);
                                         ^~~~~~~~~~~~~~~~~~~~~~~~
prog.c: In function ‘func’:
prog.c:9:2: warning: implicit declaration of function ‘ulTaskNotifyTake’ [-Wimplicit-function-declaration]
  ulTaskNotifyTake(pdTRUE, pdMS_TO_TICKS(100));
  ^~~~~~~~~~~~~~~~
prog.c:9:19: error: ‘pdTRUE’ undeclared (first use in this function)
  ulTaskNotifyTake(pdTRUE, pdMS_TO_TICKS(100));
                   ^~~~~~
prog.c:9:27: warning: implicit declaration of function ‘pdMS_TO_TICKS’ [-Wimplicit-function-declaration]
  ulTaskNotifyTake(pdTRUE, pdMS_TO_TICKS(100));
                           ^~~~~~~~~~~~~

Standard output is empty