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agar.c
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agar.c
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#include "./headers/libraries.h"
#include "./headers/structures.h"
#include "./headers/global_variables.h"
#include "./headers/functions.h"
//------------------------------------------//
// initializes a syncronization structure //
//------------------------------------------//
void sync_init(struct sync *s)
{
s->nbw = 0;
s->nbr = 0;
s->nr = 0;
s->nw = 0;
sem_init(&s->priv_r, TRUE, 0);
sem_init(&s->priv_w, TRUE, 0);
sem_init(&s->m, TRUE, 1);
}
//--------------------------------//
// starts reading of a resource //
//--------------------------------//
void start_read(struct sync *s)
{
sem_wait(&s->m);
if (s->nw > 0 || s->nbw > 0) {
s->nbr++;
}
else {
s->nr++;
sem_post(&s->priv_r);
}
sem_post(&s->m);
sem_wait(&s->priv_r);
}
//------------------------------//
// ends reading of a resource //
//------------------------------//
void end_read(struct sync *s)
{
sem_wait(&s->m);
s->nr--;
if (s->nbw > 0 && s->nr == 0) {
s->nbw--;
s->nw++;
sem_post(&s->priv_w);
}
sem_post(&s->m);
}
//--------------------------------//
// starts writing to a resource //
//--------------------------------//
void start_write(struct sync *s)
{
sem_wait(&s->m);
if (s->nr > 0 || s->nw > 0) {
s->nbw++;
}
else {
s->nw++;
sem_post(&s->priv_w);
}
sem_post(&s->m);
sem_wait(&s->priv_w);
}
//------------------------------//
// ends writing to a resource //
//------------------------------//
void end_write(struct sync *s)
{
sem_wait(&s->m);
s->nw--;
if (s->nbr > 0) {
while (s->nbr > 0) {
s->nbr--;
s->nr++;
sem_post(&s->priv_r);
}
}
else if (s->nbw > 0) {
s->nbw--;
s->nw++;
sem_post(&s->priv_w);
}
sem_post(&s->m);
}
//--------------------------------//
// draws a circle on the buffer //
//--------------------------------//
void drawCircle(float x, float y, int r, int c)
{
acquire_bitmap(buffer);
circlefill(buffer, x, y, r, c);
release_bitmap(buffer);
}
//---------------------------------------//
// returns distance between the center //
// of a ball and a position //
//---------------------------------------//
float distance(float position_x, float position_y, int index)
{
return sqrt((position_x - balls[index].px)
* (position_x - balls[index].px)
+ (position_y - balls[index].py)
* (position_y - balls[index].py));
}
//--------------------------------------//
// returns distance between two balls //
// (zero if they are overlapped) //
//--------------------------------------//
float overlap_distance(int ball1, int ball2)
{
if (ball1 > -1 && ball2 > -1) {
if (balls[ball1].r < balls[ball2].r) {
return sqrt((balls[ball1].px - balls[ball2].px)
* (balls[ball1].px - balls[ball2].px)
+ (balls[ball1].py - balls[ball2].py)
* (balls[ball1].py - balls[ball2].py))
+ balls[ball1].r - balls[ball2].r;
}
else {
return sqrt((balls[ball1].px - balls[ball2].px)
* (balls[ball1].px - balls[ball2].px)
+ (balls[ball1].py - balls[ball2].py)
* (balls[ball1].py - balls[ball2].py))
+ balls[ball2].r - balls[ball1].r;
}
}
else {
return 10000.0;
}
}
//--------------------------------------//
// returns distance between two balls //
// (zero if they are colliding) //
//--------------------------------------//
float collision_distance(int ball1, int ball2)
{
if (ball1 > -1 && ball2 > -1) {
return sqrt((balls[ball1].px - balls[ball2].px)
* (balls[ball1].px - balls[ball2].px)
+ (balls[ball1].py - balls[ball2].py)
* (balls[ball1].py - balls[ball2].py))
- (balls[ball1].r + balls[ball2].r) * 3 / 5;
}
else {
return 10000.0;
}
}
//-----------------------------------------------//
// writes an integer in ASCII to a given char* //
// N.B: string must be previously allocated //
//-----------------------------------------------//
void itos(char *string, int n)
{
int tmp;
int i, j;
for (i = 11; i > 0; i--) {
if (n / (int)(pow(10, i))) {
for (j = 0; i > 0; j++, i--) {
tmp = n / (int)(pow(10, i));
string[j] = (char)((n / (int)(pow(10, i)) % 10) + 48);
}
string[j] = 0;
return;
}
}
}
//----------------------------------------//
// returns the indexes of the two balls //
// nearest to the given index //
//----------------------------------------//
int nearest(int index)
{
int near = -1, near2 = -1;
int dist = 10000000;
float d;
int i;
for (i = 0; i < N_BALLS; i++) {
d = collision_distance(i, index);
if (d < dist && index != i && balls[i].alive) {
dist = d;
near = i;
}
}
dist = 10000000;
for (i = 0; i < N_BALLS; i++) {
d = collision_distance(i, index);
if (i != near && d < dist && index != i && balls[i].alive) {
dist = d;
near2 = i;
}
}
return near2 * 128 + near;
}
//------------------------------------------------//
// checks if the given ball is in a corner area //
// and tries to avoid to be stuck there //
//------------------------------------------------//
void check_corner(int *index, float *angle, float *dist, int *corner)
{
if (balls[*index].py + balls[*index].px
- YWIN + XWIN / 3 - balls[*index].r * 2 < 0)
*corner = 1;
if (balls[*index].py - balls[*index].px + XWIN
- YWIN + XWIN / 3 - balls[*index].r * 2 < 0)
*corner = 2;
if (balls[*index].py + balls[*index].px - XWIN
- XWIN / 3 + balls[*index].r * 2 > 0)
*corner = 3;
if (balls[*index].py - balls[*index].px
- XWIN / 3 + balls[*index].r * 2 > 0)
*corner = 4;
if (*corner) {
*dist = ABS(diag / 2 - balls[*index].r * 2
- distance(XWIN / 2, YWIN / 2, *index));
*angle = atanf((balls[*index].py - YWIN / 2)
/ (XWIN / 2 - balls[*index].px));
if (*corner == 2 || *corner == 3) {
*angle += M_PI;
}
}
}
//----------------------------------------------------------//
// checks if the given ball is in a border area and tries //
// to avoid to be stuck there (overwrites check_corner) //
//----------------------------------------------------------//
void check_border(int *index, float *angle, float *dist, int *near)
{
if (balls[*index].px < YWIN * 3 / 9
|| balls[*index].px > XWIN - YWIN * 3 / 9
|| balls[*index].py < YWIN * 2 / 9
|| balls[*index].py > YWIN - YWIN * 2 / 9)
{
if (balls[*index].px < *dist) {
*dist = balls[*index].px;
*near = -2;
}
if (XWIN - balls[*index].px < *dist) {
*dist = XWIN - balls[*index].px;
*near = -4;
}
if (balls[*index].py < *dist) {
*dist = balls[*index].py;
*near = -3;
}
if (YWIN - balls[*index].py < *dist) {
*dist = YWIN - balls[*index].py;
*near = -5;
}
if (*near < -1) {
*angle = atanf((balls[*index].py - YWIN / 2)
/ (XWIN / 2 - balls[*index].px));
if (XWIN / 2 < balls[*index].px)
*angle += M_PI;
}
}
}
//---------------------------//
// assignes first distance //
//---------------------------//
int assign_dist1(int *index, int *near, float *dist, float *dist2)
{
if (*near > -1) {
*dist = collision_distance(*index, *near);
return TRUE;
}
else if (*near == -1) {
*dist2 = 0;
*dist = 10000;
return FALSE;
}
}
//----------------------------//
// assignes second distance //
//----------------------------//
void assign_dist2(int *index, int *near2, float *dist2, int *corner)
{
if (*near2 > -1 && !(*corner)) {
*dist2 = collision_distance(*index, *near2);
}
else if (!(*corner)) {
*dist2 = 10000;
}
}
//-----------------------------------------------//
// modifies angles not to invert the direction //
//-----------------------------------------------//
void adjust_angles(int *near, int* near2, float *angle,
float *angle2, int* index, int *corner)
{
if (balls[*near].px > balls[*index].px) {
*angle += M_PI;
}
if (balls[*near2].px > balls[*index].px && *near2 > -1 && !*corner) {
*angle2 += M_PI;
}
if (ABS(*angle - *angle2) > M_PI) {
if (*angle > *angle2)
*angle2 += 2 * M_PI;
else
*angle += 2 * M_PI;
}
}
//----------------------------------------------//
// prevent the ball to escape from the screen //
//----------------------------------------------//
void hold_ball(int *index)
{
if (balls[*index].px < 0) {
balls[*index].px = 0;
}
if (balls[*index].px > XWIN) {
balls[*index].px = XWIN;
}
if (balls[*index].py < 0) {
balls[*index].py = 0;
}
if (balls[*index].py > YWIN) {
balls[*index].py = YWIN;
}
}
//--------------------------//
// escapes from two balls //
//--------------------------//
void escape(int index, int near, int near2, float dt)
{
float dist = -1, dist2 = -1, v, angle, angle2;
int corner = 0;
if (!assign_dist1(&index, &near, &dist, &dist2))
return;
check_corner(&index, &angle2, &dist2, &corner);
assign_dist2(&index, &near2, &dist2, &corner);
start_read(&sem_velocity);
v = VELOCITY * 4 / balls[index].r;
end_read(&sem_velocity);
angle = atanf((balls[near].py - balls[index].py)
/ (balls[index].px - balls[near].px));
check_border(&index, &angle2, &dist2, &near2);
if (near2 > -1 && !corner) {
angle2 = atanf((balls[near2].py - balls[index].py)
/ (balls[index].px - balls[near2].px));
}
adjust_angles(&near, &near2, &angle, &angle2, &index, &corner);
if (dist || dist2) {
balls[index].angle = (angle * dist2 * dist2 + angle2 * dist * dist)
/ (dist * dist + dist2 * dist2);
}
balls[index].px += v * dt * cosf(balls[index].angle);
balls[index].py -= v * dt * sinf(balls[index].angle);
hold_ball(&index);
}
//------------------------------//
// follows a certain position //
//------------------------------//
void follow(float dt, float position_x, float position_y, int index)
{
float v;
balls[index].angle = atanf((balls[index].py - position_y)
/ (position_x - balls[index].px));
if (position_x < balls[index].px)
balls[index].angle += M_PI;
start_read(&sem_velocity);
v = VELOCITY * 4 / balls[index].r;
end_read(&sem_velocity);
if (distance(position_x, position_y, index) > 1) {
balls[index].px += v * dt * cosf(balls[index].angle);
balls[index].py -= v * dt * sinf(balls[index].angle);
}
}
//--------------------------------------------------//
// follows a ball while escaping from another one //
//--------------------------------------------------//
void follow_escape(int index, int follow, int escape, float dt)
{
float dist = -1, dist2 = -1, v, angle, angle2;
int corner = 0;
float dist_follow = collision_distance(index, follow);
float dist_escape = collision_distance(index, escape);
dist = dist_follow;
if (dist_follow > dist_escape * 3)
check_corner(&index, &angle, &dist, &corner);
check_border(&index, &angle, &dist, &follow);
if (follow > -1 && !corner) {
angle = atanf((balls[index].py - balls[follow].py)
/ (balls[follow].px - balls[index].px)) + M_PI;
}
dist2 = dist_escape;
angle2 = atanf((balls[escape].py - balls[index].py)
/ (balls[index].px - balls[escape].px));
if (dist2 > balls[index].r * 4 || dist < dist2 && follow > -1)
dist = 0;
start_read(&sem_velocity);
v = VELOCITY * 4 / balls[index].r;
end_read(&sem_velocity);
adjust_angles(&escape, &follow, &angle2, &angle, &index, &corner);
balls[index].angle = (angle * dist2 * dist2 + angle2 * dist * dist)
/ (dist * dist + dist2 * dist2);
balls[index].px += v * dt * cosf(balls[index].angle);
balls[index].py -= v * dt * sinf(balls[index].angle);
hold_ball(&index);
}
//----------------------------------------//
// draws a rotated triangle on a buffer //
//----------------------------------------//
void rotateTriangle(BITMAP *buffer, int x, int y,
int color, size_t size, float angle)
{
triangle(buffer,
x + size * cosf(angle), y - size * sinf(angle),
x + size * cosf(angle + M_PI / 3 * 4),
y - size * sinf(angle + M_PI / 3 * 4),
x + size * cosf(angle + M_PI / 3 * 2),
y - size * sinf(angle + M_PI / 3 * 2),
color);
}
//-----------------------------------------//
// updates balls' data after a collision //
//-----------------------------------------//
void collision_update(int *i, int *j)
{
start_read(&sem_end);
if (collision_distance(*i, *j) < 0 && !END
|| END && overlap_distance(*i, *j) < 0)
{
if (!END) {
end_read(&sem_end);
balls[*i].amount += balls[*j].amount;
balls[*i].r = sqrt(balls[*i].amount / M_PI);
}
else
end_read(&sem_end);
balls[*j].alive = FALSE;
itos(amounts[*i], balls[*i].amount);
}
else
end_read(&sem_end);
}
//---------------------------------------------------------//
// checks if there have been collisions and updates data //
//---------------------------------------------------------//
void collision()
{
for (int i = 0; i < N_BALLS - 1; i++)
{
for (int j = i + 1; j < N_BALLS; j++)
{
if (balls[i].alive && balls[j].alive)
{
if (balls[i].r > balls[j].r) {
collision_update(&i, &j);
}
else {
collision_update(&j, &i);
}
}
}
}
}
//--------------------------------------------------------//
// checks if the current ball collides with another one //
//--------------------------------------------------------//
int check_collision(int i)
{
for (int j = 0; j < i; j++) {
if (collision_distance(i, j) < 0)
return TRUE;
}
return FALSE;
}
//------------------------------------//
// checks if a ball is greater than //
// the sum of all the others //
//------------------------------------//
void win(int index, float *total_amount)
{
if (balls[index].amount > *total_amount / 2) {
balls[index].amount += WIN_ANIMATION_SPEED * 7000 * SCALE;
itos(amounts[index], balls[index].amount);
balls[index].r = sqrt(balls[index].amount / M_PI);
start_read(&sem_end);
if (!END) {
end_read(&sem_end);
start_write(&sem_end);
END = TRUE;
end_write(&sem_end);
}
else
end_read(&sem_end);
}
}
//------------------------------------------//
// initializes parameters of a given ball //
//------------------------------------------//
void init_ball(int index)
{
balls[index].px = rand() % XWIN;
balls[index].py = rand() % YWIN;
balls[index].r = 50 * SCALE + ((float)(rand() % 3000)
/ (float)((rand() % 3000) + 1000));
balls[index].color = index % 15 + 1;
while (balls[index].color == 4)
balls[index].color = ABS(rand()) % 15 + 1;
balls[index].alive = TRUE;
balls[index].amount = balls[index].r * balls[index].r * M_PI;
}
//--------------------//
// user ball's task //
//--------------------//
void ball_player_task()
{
float dt = (float)ptask_get_period(0, 1);
while (!KILL_ALL) {
ptask_wait_for_period();
start_read(&sem_pause);
if (!PAUSE) {
end_read(&sem_pause);
start_write(&sem_balls);
if (!balls[0].alive || BET) {
end_write(&sem_balls);
continue;
}
follow(dt, mouse_x, mouse_y, 0);
end_write(&sem_balls);
}
else
end_read(&sem_pause);
}
}
//-------------------------------------------//
// find and assigns nearest balls' indexes //
//-------------------------------------------//
void find_nears(int i, int *near, int *near2)
{
*near = nearest(i);
*near2 = nearbyintf((float)(*near) / (float)128);
*near = *near - (*near2 * 128);
}
//----------------------------------------------//
// defines and applies what the ball is doing //
//----------------------------------------------//
void behaviour(int i, int near, int near2, float dt)
{
if (near2 != -1)
if (balls[near].r < balls[i].r)
if (balls[near2].r < balls[i].r)
follow(dt, balls[near].px, balls[near].py, i);
else
follow_escape(i, near, near2, dt);
else if (balls[near2].r < balls[i].r)
follow_escape(i, near2, near, dt);
else
escape(i, near, near2, dt);
else if (balls[near].r < balls[i].r)
follow(dt, balls[near].px, balls[near].py, i);
else
escape(i, near, near2, dt);
}
//-----------------------//
// generic ball's task //
//-----------------------//
void ball_task()
{
int i = ptask_get_index(), near, near2;
float dt = (float)ptask_get_period(i, 1);
while (!KILL_ALL) {
ptask_wait_for_period();
start_read(&sem_pause);
if (!PAUSE) {
end_read(&sem_pause);
start_read(&sem_balls);
if (!balls[i].alive) {
end_read(&sem_balls);
continue;
}
find_nears(i, &near, &near2);
end_read(&sem_balls);
start_write(&sem_balls);
behaviour(i, near, near2, dt);
end_write(&sem_balls);
}
else
end_read(&sem_pause);
}
}
//-------------------------------------//
// draws all the balls on the buffer //
//-------------------------------------//
void draw_balls()
{
int i;
for (i = 1; i < N_BALLS; i++) {
if (balls[i].alive) {
drawCircle(balls[i].px, balls[i].py,
balls[i].r, balls[i].color);
textout_centre_ex(buffer, font_game, amounts[i], balls[i].px,
balls[i].py - 5 + 10 * (-BET), BG_COLOR, -1);
if (BET)
textout_centre_ex(buffer, font_game, names[i],
balls[i].px, balls[i].py - 20, BG_COLOR, -1);
}
}
if (balls[0].alive && !BET) {
drawCircle(balls[0].px, balls[0].py, balls[0].r, balls[0].color);
rotateTriangle(buffer, mouse_x, mouse_y, RED,
30 * SCALE, balls[0].angle);
textout_centre_ex(buffer, font_game, amounts[0], balls[0].px,
balls[0].py - 5, BG_COLOR, -1);
}
}
//----------------------------------------//
// draws all the messages on the buffer //
//----------------------------------------//
void display_messages(float *total_amount)
{
int i, j;
for (i = 0; i < N_BALLS; i++) {
if (balls[i].amount > *total_amount / 2) {
start_read(&sem_end);
if (!END) {
end_read(&sem_end);
textout_centre_ex(buffer, font_menu, "Press "
"X to explode", XWIN / 2, YWIN / 10, WHITE, -1);
}
else if (BET) {
end_read(&sem_end);
textout_centre_ex(buffer, font_menu, "The "
"winner is:", XWIN / 2, YWIN / 10, WHITE, -1);
textout_centre_ex(buffer, font_menu, names[i],
XWIN / 2 + 200, YWIN / 10 + 2, WHITE, -1);
textout_centre_ex(buffer, font_game, "Press ESC "
"for options", XWIN / 2, YWIN / 10 + 70, WHITE, -1);
}
else {
end_read(&sem_end);
if (i) {
textout_centre_ex(buffer, font_menu, "You "
"lost", XWIN / 2, YWIN / 10, WHITE, -1);
textout_centre_ex(buffer, font_game, "Press "
"ESC for options", XWIN / 2, YWIN / 10 + 70, WHITE, -1);
}
else {
textout_centre_ex(buffer, font_menu, "You won",
XWIN / 2, YWIN / 10, WHITE, -1);
textout_centre_ex(buffer, font_game, "Press ESC "
"for options", XWIN / 2, YWIN / 10 + 70, WHITE, -1);
}
}
}
}
}
//------------------------------------------//
// task that draws anything on the buffer //
//------------------------------------------//
void display_task()
{
int i;
float total_amount;
while (!KILL_ALL) {
start_read(&sem_pause);
if (!PAUSE) {
end_read(&sem_pause);
clear_to_color(buffer, BG_COLOR);
start_read(&sem_balls);
draw_balls();
total_amount = 0;
for (i = 0; i < N_BALLS; i++) {
if (balls[i].alive)
total_amount += balls[i].amount;
}
display_messages(&total_amount);
end_read(&sem_balls);
rect(buffer, 0, 0, XWIN - 1, YWIN - 1, WHITE);
draw_sprite(screen, buffer, 0, 0);
}
else
end_read(&sem_pause);
ptask_wait_for_period();
}
}
//------------------------------------------------//
// task that checks collisions and updates data //
//------------------------------------------------//
void collision_task()
{
while (!KILL_ALL) {
start_read(&sem_pause);
if (!PAUSE)
{
end_read(&sem_pause);
start_write(&sem_balls);
collision();
end_write(&sem_balls);
}
else
end_read(&sem_pause);
ptask_wait_for_period();
}
}
//------------------//
// plays the game //
//------------------//
void init_game(int bet)
{
balls = malloc(N_BALLS * sizeof(struct ball));
amounts = malloc(N_BALLS * sizeof(int *));
names = malloc(N_BALLS * sizeof(int *));
sync_init(&sem_balls);
sync_init(&sem_pause);
sync_init(&sem_end);
sync_init(&sem_velocity);
for (int i = 0; i < N_BALLS; i++) {
amounts[i] = malloc(11);
names[i] = malloc(5);
init_ball(i);
sprintf(amounts[i], "%d", i);
sprintf(names[i], "%d", i);
while (check_collision(i))
init_ball(i);
}
balls[0].color = RED;
balls[0].r = 53 * SCALE;
balls[0].amount = balls[0].r * balls[0].r * M_PI;
for (int i = 0; i < N_BALLS; i++) {
itos(amounts[i], balls[i].amount);
}
if (bet) {
balls[0].alive = FALSE;
BET = TRUE;
}
}
//----------------------------------------//
// shows balls' positions to the player //
// before the game starts //
//----------------------------------------//
void show_balls(struct timeval *t1, struct timeval *t2, float *dt)
{
float init_px = balls[0].px;
float init_py = balls[0].py;
int i;
position_mouse(balls[0].px, balls[0].py);
gettimeofday(t1, NULL);
while (!key[KEY_SPACE]) {
timing(t1, t2, dt);
if (*dt > (float)1000 / (float)FPS)
{
gettimeofday(t1, NULL);
clear_to_color(buffer, BG_COLOR);
balls[0].px = init_px;
balls[0].py = init_py;
draw_balls();
textout_centre_ex(buffer, font_menu, "Press SPACE to start",
XWIN / 2, YWIN / 2, WHITE, -1);
rect(buffer, 0, 0, XWIN - 1, YWIN - 1, WHITE);
follow(*dt, mouse_x, mouse_y, 0);
draw_sprite(screen, buffer, 0, 0);
}
}
}
//------------------------------------//
// create a task for each ball, the //
// collision and the display task //
//------------------------------------//
void create_tasks()
{
int i;
ptask_create_prio(ball_player_task, 1000 / FPS, 80, 1);
for (i = 1; i < N_BALLS; i++) {
ptask_create_prio(ball_task, 1000 / FPS, 80, 1);
}
ptask_create_prio(collision_task, 1000 / FPS, 80, 1);
ptask_create_prio(display_task, 1000 / FPS, 80, 1);
}
//-------------------------------//
// checks if there is a winner //
//-------------------------------//
void check_win(float *total_amount, int *x)
{
int i;
*total_amount = 0;
for (int i = 0; i < N_BALLS; i++) {
if (balls[i].alive)
*total_amount += balls[i].amount;
}
for (i = 0; i < N_BALLS; i++)
if (*x)
win(i, total_amount);
start_read(&sem_end);
if (!END) {
end_read(&sem_end);
*x = FALSE;
}
else
end_read(&sem_end);
}
//-----------------------------------------//
// while other tasks are running, manage //
// keyboard input and winning status //
//-----------------------------------------//
void controller(int *x, float *total_amount)
{
if (key[KEY_RIGHT]) {
start_write(&sem_velocity);
VELOCITY += 0.02;
end_write(&sem_velocity);
}
if (key[KEY_LEFT]) {
start_read(&sem_velocity);
if (VELOCITY > 0.02) {
end_read(&sem_velocity);
start_write(&sem_velocity);
VELOCITY -= 0.02;
end_write(&sem_velocity);
}
else
end_read(&sem_velocity);
}
if (key[KEY_X])
*x = TRUE;
check_win(total_amount, x);
}
//************************************************//
// closes the program returning a certain value //
//************************************************//
void close_all(int return_value)
{
destroy_font(font_menu);
destroy_font(font_game);
destroy_bitmap(buffer);
allegro_exit();
free(balls);
exit(return_value);
}
//************************************//
// resets parameters to resume game //
//************************************//
void reset_from_pause(int *x, int p)
{
start_read(&sem_end);
if (END) {
end_read(&sem_end);
start_write(&sem_velocity);
VELOCITY = ((float)XWIN * (float)YWIN)
/ ((float)1366 * (float)768);
end_write(&sem_velocity);
start_write(&sem_end);
END = FALSE;
end_write(&sem_end);
}
else
end_read(&sem_end);
if(p)
*x = FALSE;
start_write(&sem_pause);
PAUSE = FALSE;
end_write(&sem_pause);
}
//*****************************************************//
// computes how_much time passed from the last check //
//*****************************************************//
void timing(struct timeval *t1, struct timeval *t2, float *dt)
{
gettimeofday(t2, NULL);
*dt = (t2->tv_sec - t1->tv_sec) * 1000.0;
*dt += (t2->tv_usec - t1->tv_usec) / 1000.0;
}