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Improve test/threads demo program

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- format "Max Prime" output as integer number
- use a fixed font for better readability
- close all windows when the user closes one of them
- use standard background and text colors
This commit is contained in:
Albrecht Schlosser 2025-07-14 16:53:23 +02:00
parent e581f50e9a
commit 80e561c78e
1 changed files with 54 additions and 22 deletions
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76
test/threads.cxx
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@ -20,7 +20,7 @@
# include <FL/Fl.H>
# include <FL/Fl_Double_Window.H>
# include <FL/Fl_Terminal.H>
# include <FL/Fl_Value_Output.H>
# include <FL/Fl_Output.H>
# include <FL/fl_ask.H>
# include "threads.h"
# include <stdio.h>
@ -37,39 +37,45 @@ struct prime {
int idx; // thread index: 0 or {1..6}
int done; // set to 1 after it was worked on
Fl_Terminal *terminal; // widget to write output to
Fl_Value_Output *value; // highest prime
unsigned long max_prime; // highest prime found so far
Fl_Output *value; // highest prime output widget
std::vector<unsigned long> primes; // collected primes within time frame
};
Fl_Thread prime_thread;
Fl_Terminal *tty1, *tty2;
Fl_Value_Output *value1, *value2;
Fl_Output *value1, *value2;
int start2 = 3;
void magic_number_cb(void *p) {
Fl_Value_Output *w = (Fl_Value_Output*)p;
Fl_Output *w = (Fl_Output*)p;
w->labelcolor(FL_RED);
w->redraw_label();
w->parent()->redraw();
// if (w == value1) Fl::hide_all_windows(); // TEST: terminate early to measure time
}
// This is called indirectly by Fl::awake(update_handler, (void *)prime)
// in the context of the main (FLTK GUI) thread.
void update_handler(void *v) {
char max_buf[32];
struct prime *pr = (struct prime *)v;
for (auto n : pr->primes) {
pr->terminal->printf("prime: %10u\n", n);
if (n > pr->value->value())
pr->value->value(n);
pr->terminal->printf("prime: %10lu\n", n);
if (n > pr->max_prime)
pr->max_prime = n;
}
snprintf(max_buf, sizeof(max_buf), "%9lu", pr->max_prime);
pr->value->value(max_buf);
pr->done = 1;
}
extern "C" void* prime_func(void* p) {
Fl_Terminal* terminal = (Fl_Terminal*)p;
Fl_Value_Output *value;
Fl_Output *value;
unsigned long n;
unsigned long max_value = 0;
int step;
char proud = 0;
@ -91,11 +97,12 @@ extern "C" void* prime_func(void* p) {
// initialize alternate buffers (struct prime) to store primes
struct prime pr[2];
pr[0].done = 0;
pr[1].done = 1;
pr[0].terminal = pr[1].terminal = terminal;
pr[0].idx = pr[1].idx = n/2 - 1;
pr[0].value = pr[1].value = value;
pr[0].idx = pr[1].idx = n/2 - 1;
pr[0].done = 0;
pr[1].done = 1;
pr[0].terminal = pr[1].terminal = terminal;
pr[0].max_prime = pr[1].max_prime = 0;
pr[0].value = pr[1].value = value;
pr[0].primes.clear();
pr[1].primes.clear();
int pi = 0; // prime buffer index
@ -115,7 +122,10 @@ extern "C" void* prime_func(void* p) {
int pp;
int hn = (int)sqrt((double)n);
for (pp = 3; pp <= hn; pp += 2) if ( n%pp == 0 ) break;
for (pp = 3; pp <= hn; pp += 2) {
if (n % pp == 0)
break;
}
if (pp > hn) { // n is a prime
@ -133,9 +143,13 @@ extern "C" void* prime_func(void* p) {
pr[pi].primes.clear(); // clear primes
}
if (n > max_value) {
pr[pi].max_prime = n;
}
n += step;
if (n > 5*1000*1000 && !proud) {
if (n > 5 * 1000 * 1000 && !proud) {
proud = 1;
Fl::awake(magic_number_cb, value);
}
@ -151,21 +165,38 @@ extern "C" void* prime_func(void* p) {
return 0L;
}
// close all windows when the user closes one of the windows
void close_cb(Fl_Widget *w, void *v) {
Fl::hide_all_windows();
printf("Max prime number with 1 thread : %s\n", value1->value());
printf("Max prime number with 6 threads: %s\n", value2->value());
return;
}
int main(int argc, char **argv)
{
// First window: single thread
Fl_Double_Window* w = new Fl_Double_Window(300, 200, "Single Thread");
tty1 = new Fl_Terminal(0, 0, 300, 175);
Fl_Double_Window* w = new Fl_Double_Window(200, 200, "Single Thread");
tty1 = new Fl_Terminal(0, 0, 200, 175);
tty1->color(FL_BACKGROUND2_COLOR);
tty1->textcolor(FL_FOREGROUND_COLOR);
w->resizable(tty1);
value1 = new Fl_Value_Output(100, 175, 200, 25, "Max Prime:");
value1 = new Fl_Output(100, 175, 98, 23, "Max Prime:");
value1->textfont(FL_COURIER);
w->callback(close_cb);
w->end();
w->show(argc, argv);
// Second window: multiple threads
w = new Fl_Double_Window(300, 200, "Six Threads");
tty2 = new Fl_Terminal(0, 0, 300, 175);
w = new Fl_Double_Window(200, 200, "Six Threads");
tty2 = new Fl_Terminal(0, 0, 200, 175);
tty2->color(FL_BACKGROUND2_COLOR);
tty2->textcolor(FL_FOREGROUND_COLOR);
w->resizable(tty2);
value2 = new Fl_Value_Output(100, 175, 200, 25, "Max Prime:");
value2 = new Fl_Output(100, 175, 98, 23, "Max Prime:");
value2->textfont(FL_COURIER);
w->callback(close_cb);
w->end();
w->show();
@ -181,6 +212,7 @@ int main(int argc, char **argv)
// Start threads...
// One thread displaying in one terminal
fl_create_thread(prime_thread, prime_func, tty1);
// Six threads displaying in another terminal