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/****************************************************************************
* Copyright (c) 1998-2006,2008 Free Software Foundation, Inc. *
* *
* Permission is hereby granted, free of charge, to any person obtaining a *
* copy of this software and associated documentation files (the *
* "Software"), to deal in the Software without restriction, including *
* without limitation the rights to use, copy, modify, merge, publish, *
* distribute, distribute with modifications, sublicense, and/or sell *
* copies of the Software, and to permit persons to whom the Software is *
* furnished to do so, subject to the following conditions: *
* *
* The above copyright notice and this permission notice shall be included *
* in all copies or substantial portions of the Software. *
* *
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
* IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
* THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
* *
* Except as contained in this notice, the name(s) of the above copyright *
* holders shall not be used in advertising or otherwise to promote the *
* sale, use or other dealings in this Software without prior written *
* authorization. *
****************************************************************************/
/*
* $Id: rain.c,v 1.34 2008/05/24 23:34:34 tom Exp $
*/
#include <test.priv.h>
/* rain 11/3/1980 EPS/CITHEP */
#ifdef USE_PTHREADS
#include <pthread.h>
#endif
WANT_USE_WINDOW();
#define MAX_THREADS 10
#define MAX_DROP 5
struct DATA;
typedef void (*DrawPart) (struct DATA *);
typedef struct DATA {
int y, x;
#ifdef USE_PTHREADS
DrawPart func;
int state;
#endif
} DATA;
#ifdef USE_PTHREADS
pthread_cond_t cond_next_drop;
pthread_mutex_t mutex_next_drop;
static int used_threads;
typedef struct {
pthread_t myself;
long counter;
} STATS;
static STATS drop_threads[MAX_THREADS];
#endif
static void
onsig(int n GCC_UNUSED)
{
curs_set(1);
endwin();
ExitProgram(EXIT_FAILURE);
}
static float
ranf(void)
{
long r = (rand() & 077777);
return ((float) r / 32768.);
}
static int
random_x(void)
{
return (((float) (COLS - 4) * ranf()) + 2);
}
static int
random_y(void)
{
return (((float) (LINES - 4) * ranf()) + 2);
}
static int
next_j(int j)
{
if (j == 0)
j = MAX_DROP - 1;
else
--j;
if (has_colors()) {
int z = (int) (3 * ranf());
chtype color = COLOR_PAIR(z);
if (z)
color |= A_BOLD;
attrset(color);
}
return j;
}
static void
part1(DATA * drop)
{
mvaddch(drop->y, drop->x, '.');
}
static void
part2(DATA * drop)
{
mvaddch(drop->y, drop->x, 'o');
}
static void
part3(DATA * drop)
{
mvaddch(drop->y, drop->x, 'O');
}
static void
part4(DATA * drop)
{
mvaddch(drop->y - 1, drop->x, '-');
mvaddstr(drop->y, drop->x - 1, "|.|");
mvaddch(drop->y + 1, drop->x, '-');
}
static void
part5(DATA * drop)
{
mvaddch(drop->y - 2, drop->x, '-');
mvaddstr(drop->y - 1, drop->x - 1, "/ \\");
mvaddstr(drop->y, drop->x - 2, "| O |");
mvaddstr(drop->y + 1, drop->x - 1, "\\ /");
mvaddch(drop->y + 2, drop->x, '-');
}
static void
part6(DATA * drop)
{
mvaddch(drop->y - 2, drop->x, ' ');
mvaddstr(drop->y - 1, drop->x - 1, " ");
mvaddstr(drop->y, drop->x - 2, " ");
mvaddstr(drop->y + 1, drop->x - 1, " ");
mvaddch(drop->y + 2, drop->x, ' ');
}
#ifdef USE_PTHREADS
static void
napsome(void)
{
napms(60);
}
/*
* This runs inside the use_window() mutex.
*/
static int
really_draw(WINDOW *win, void *arg)
{
DATA *data = (DATA *) arg;
(void) win;
next_j(data->state);
data->func(data);
refresh();
return OK;
}
static void
draw_part(void (*func) (DATA *), int state, DATA * data)
{
data->func = func;
data->state = state;
use_window(stdscr, really_draw, (void *) data);
napsome();
}
/*
* Tell the threads that one of them can start work on a new raindrop.
* They may all be busy if we're sending requests too rapidly.
*/
static int
put_next_drop(void)
{
pthread_cond_signal(&cond_next_drop);
pthread_mutex_unlock(&mutex_next_drop);
return 0;
}
/*
* Wait until we're assigned the task of drawing a new raindrop.
*/
static int
get_next_drop(void)
{
pthread_mutex_lock(&mutex_next_drop);
pthread_cond_wait(&cond_next_drop, &mutex_next_drop);
return TRUE;
}
static void *
draw_drop(void *arg)
{
DATA mydata;
int mystats;
/*
* Find myself in the list of threads so we can count the number of loops.
*/
for (mystats = 0; mystats < MAX_THREADS; ++mystats) {
if (drop_threads[mystats].myself == pthread_self())
break;
}
do {
if (mystats < MAX_THREADS)
drop_threads[mystats].counter++;
/*
* Make a copy of caller's data. We're cheating for the cases after
* the first loop since we still have a pointer into the main thread
* to the data which it uses for setting up this thread (but it has
* been modified to use different coordinates).
*/
mydata = *(DATA *) arg;
draw_part(part1, 0, &mydata);
draw_part(part2, 1, &mydata);
draw_part(part3, 2, &mydata);
draw_part(part4, 3, &mydata);
draw_part(part5, 4, &mydata);
draw_part(part6, 0, &mydata);
} while (get_next_drop());
return NULL;
}
/*
* The description of pthread_create() is misleading, since it implies that
* threads will exit cleanly after their function returns.
*
* Since they do not (and the number of threads is limited by system
* resources), make a limited number of threads, and signal any that are
* waiting when we want a thread past that limit.
*/
static int
start_drop(DATA * data)
{
int rc;
if (!used_threads) {
/* mutex and condition for signalling thread */
pthread_mutex_init(&mutex_next_drop, NULL);
pthread_cond_init(&cond_next_drop, NULL);
}
if (used_threads < MAX_THREADS) {
rc = pthread_create(&(drop_threads[used_threads].myself),
NULL,
draw_drop,
data);
++used_threads;
} else {
rc = put_next_drop();
}
return rc;
}
#endif
static int
get_input(void)
{
return USING_WINDOW(stdscr, wgetch);
}
int
main(int argc GCC_UNUSED,
char *argv[]GCC_UNUSED)
{
bool done = FALSE;
DATA drop;
#ifndef USE_PTHREADS
DATA last[MAX_DROP];
#endif
int j = 0;
setlocale(LC_ALL, "");
CATCHALL(onsig);
initscr();
if (has_colors()) {
int bg = COLOR_BLACK;
start_color();
#if HAVE_USE_DEFAULT_COLORS
if (use_default_colors() == OK)
bg = -1;
#endif
init_pair(1, COLOR_BLUE, bg);
init_pair(2, COLOR_CYAN, bg);
}
nl();
noecho();
curs_set(0);
timeout(0);
#ifndef USE_PTHREADS
for (j = MAX_DROP; --j >= 0;) {
last[j].x = random_x();
last[j].y = random_y();
}
j = 0;
#endif
while (!done) {
drop.x = random_x();
drop.y = random_y();
#ifdef USE_PTHREADS
if (start_drop(&drop) != 0) {
beep();
}
#else
/*
* The non-threaded code draws parts of each drop on each loop.
*/
part1(&drop);
part2(&last[j]);
j = next_j(j);
part3(&last[j]);
j = next_j(j);
part4(&last[j]);
j = next_j(j);
part5(&last[j]);
j = next_j(j);
part6(&last[j]);
last[j] = drop;
#endif
switch (get_input()) {
case ('q'):
case ('Q'):
done = TRUE;
break;
case 's':
nodelay(stdscr, FALSE);
break;
case ' ':
nodelay(stdscr, TRUE);
break;
#ifdef KEY_RESIZE
case (KEY_RESIZE):
break;
#endif
}
napms(50);
}
curs_set(1);
endwin();
#ifdef USE_PTHREADS
printf("Counts per thread:\n");
for (j = 0; j < MAX_THREADS; ++j)
printf(" %d:%ld\n", j, drop_threads[j].counter);
#endif
ExitProgram(EXIT_SUCCESS);
}
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