void fwin_putchar(int c)
{
if (!windowed)
{
#ifdef __CYGWIN__
if (c == '\n') putchar('\r');
#endif
putchar(c);
return;
}
// Observe that since I am concerned (at least a bit) with performance
// I buffer characters here so that the cost of inter-thread communication
// is not suffered. But every other second (or so) the user-interface thread
// will be worken up and will flush the buffer for me, so the user ought to
// be given a tolerable experience/
int nxt = term->fwin_in + 1;
if (nxt == FWIN_BUFFER_SIZE) nxt = 0;
if (nxt == term->fwin_out ||
term->pauseFlags & PAUSE_PAUSE) fwin_ensure_screen();
// Note and BEWARE here that fwin_ensure_screen() can synchronize the
// worker and interface threads and update fwin_in. Observe also that I
// can generate a screen update if ^S has been hit.
term->fwin_buffer[term->fwin_in] = c;
nxt = term->fwin_in + 1;
if (nxt == FWIN_BUFFER_SIZE) nxt = 0;
term->fwin_in = nxt;
FILE *f = term->logfile;
if (f != NULL) putc(c, f);
}
void fwin_showmath(const char *s)
{
if (!windowed) return;
fwin_ensure_screen(); // get regular text up to date first.
fwin_maths = s;
LockMutex(term->pauseMutex);
// here I have to do real inter-thread communication.
if (delay_callback != NULL) (*delay_callback)(1);
wake_up_terminal(FXTerminal::SHOW_MATH);
// here I need to wait until the signal that I just sent has been received
// and processed.
regain_lockstep();
if (delay_callback != NULL) (*delay_callback)(0);
UnlockMutex(term->pauseMutex);
}
void flush_screen()
{
fwin_ensure_screen();
}
