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FvwmRearrange: rewrite event loop
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Rather than relying on FvwmRearrange not creating a race condition
between gathering a list of windows, and sending commands back to fvwm
to move them, use a common event loop like how every other module does.
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@ThomasAdam @somiaj
ThomasAdam authored and somiaj committed Oct 25, 2024
1 parent e0d4257 commit 2e9b186
Showing 1 changed file with 117 additions and 129 deletions.
246 changes: 117 additions & 129 deletions modules/FvwmRearrange/FvwmRearrange.c
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Original file line number Diff line number Diff line change
Expand Up @@ -91,6 +91,8 @@ window_list wins = NULL, wins_tail = NULL;
int wins_count = 0;
FILE *console;

static void Loop(int *);
static void process_message(unsigned long, unsigned long *);
static void free_window_list(window_list);

/* Computation variables */
Expand Down Expand Up @@ -128,6 +130,7 @@ int titled = 1;
int desk = 0;
int reversed = 0;
int do_ewmhiwa = 0;
int is_init = 1;

/* Monitor to act on. */
struct monitor *mon;
Expand All @@ -151,6 +154,12 @@ DeadPipe(int sig)
SIGNAL_RETURN;
}

RETSIGTYPE
HandleAlarm(int sig)
{
DeadPipe(sig);
}

void
insert_window_list(window_item *wi_new)
{
Expand Down Expand Up @@ -345,122 +354,35 @@ is_suitable_window(unsigned long *body)
}

void
process_name(unsigned long type, unsigned long *body)
get_window(unsigned long *body)
{
window_item *wi = wins;

while (wi != NULL && wi->w != body[0])
wi = wi->next;

if (wi == NULL)
return;

switch(type) {
case M_RES_NAME:
free(wi->resource);
wi->resource = fxstrdup((char *)(&body[3]));
break;
case M_RES_CLASS:
free(wi->class);
wi->class = fxstrdup((char *)(&body[3]));
break;
case M_ICON_NAME:
free(wi->icon_name);
wi->icon_name = fxstrdup((char *)(&body[3]));
break;
case M_WINDOW_NAME:
free(wi->name);
wi->name = fxstrdup((char *)(&body[3]));
break;
}
}

int
get_window(void)
{
FvwmPacket *packet;
struct ConfigWinPacket *cfgpacket;
int last = 1;
fd_set infds;

FD_ZERO(&infds);
FD_SET(fd[1], &infds);
select(fd_width, SELECT_FD_SET_CAST & infds, 0, 0, NULL);

if ((packet = ReadFvwmPacket(fd[1])) == NULL)
DeadPipe(0);
else {
cfgpacket = (struct ConfigWinPacket *)packet->body;
switch (packet->type &= ~M_EXTENDED_MSG) {
case M_CONFIGURE_WINDOW:
if (is_suitable_window(packet->body)) {
window_item *wi = fxmalloc(sizeof(window_item));
wi->w = cfgpacket->w;
wi->x = cfgpacket->frame_x;
wi->y = cfgpacket->frame_y;
wi->frame = cfgpacket->frame;
wi->th = cfgpacket->title_height;
wi->bw = cfgpacket->border_width;
wi->width = cfgpacket->frame_width;
wi->height = cfgpacket->frame_height;
wi->base_w = cfgpacket->hints_base_width;
wi->base_h = cfgpacket->hints_base_height;
wi->min_w = cfgpacket->hints_min_width;
wi->min_h = cfgpacket->hints_min_height;
wi->max_w = cfgpacket->hints_max_width;
wi->max_h = cfgpacket->hints_max_height;
wi->inc_w = cfgpacket->hints_width_inc;
wi->inc_h = cfgpacket->hints_height_inc;
wi->flags = cfgpacket->flags;
wi->name = NULL;
wi->icon_name = NULL;
wi->class = NULL;
wi->resource = NULL;
insert_window_list(wi);
++wins_count;
}
break;

case M_RES_NAME:
case M_RES_CLASS:
case M_ICON_NAME:
case M_WINDOW_NAME:
process_name(packet->type, packet->body);
break;

case M_END_WINDOWLIST:
last = 0;
break;

default:
fprintf(console,
"%s: internal inconsistency: unknown message "
"0x%08x\n",
module->name, (int)packet->type);
break;
}
}
return last;
}

void
wait_configure(window_item *wi)
{
int found = 0;

/** Uh, what's the point of the select() here?? **/
fd_set infds;
FD_ZERO(&infds);
FD_SET(fd[1], &infds);
select(fd_width, SELECT_FD_SET_CAST & infds, 0, 0, NULL);
struct ConfigWinPacket *cfgpacket = (void *)body;

while (!found) {
FvwmPacket *packet = ReadFvwmPacket(fd[1]);
if (packet == NULL)
DeadPipe(0);
if (packet->type == M_CONFIGURE_WINDOW
&& (Window)(packet->body[1]) == wi->frame)
found = 1;
if (is_suitable_window(body)) {
window_item *wi = fxmalloc(sizeof(window_item));
wi->w = cfgpacket->w;
wi->x = cfgpacket->frame_x;
wi->y = cfgpacket->frame_y;
wi->frame = cfgpacket->frame;
wi->th = cfgpacket->title_height;
wi->bw = cfgpacket->border_width;
wi->width = cfgpacket->frame_width;
wi->height = cfgpacket->frame_height;
wi->base_w = cfgpacket->hints_base_width;
wi->base_h = cfgpacket->hints_base_height;
wi->min_w = cfgpacket->hints_min_width;
wi->min_h = cfgpacket->hints_min_height;
wi->max_w = cfgpacket->hints_max_width;
wi->max_h = cfgpacket->hints_max_height;
wi->inc_w = cfgpacket->hints_width_inc;
wi->inc_h = cfgpacket->hints_height_inc;
wi->flags = cfgpacket->flags;
wi->name = NULL;
wi->icon_name = NULL;
wi->class = NULL;
wi->resource = NULL;
insert_window_list(wi);
++wins_count;
}
}

Expand Down Expand Up @@ -498,12 +420,11 @@ move_resize_raise_window(window_item *wi, int x, int y, int w, int h)
const char *ewmhiwa = do_ewmhiwa ? "ewmhiwa" : "";
int orig_w = wi->width - frame_size(wi, 1);
int orig_h = wi->height - frame_size(wi, 0);
int do_wait = 1;

if (x == wi->x && y == wi->y && (!resize ||
(w == orig_w && h == orig_h))) {
/* Window is the same size/position. Do nothing. */
do_wait = 0;
return;
} else if (resize) {
const char *function =
do_maximize ? "ResizeMoveMaximize" : "ResizeMove";
Expand All @@ -522,9 +443,6 @@ move_resize_raise_window(window_item *wi, int x, int y, int w, int h)

if (raise_window)
SendText(fd, "Raise", wi->frame);

if (do_wait)
wait_configure(wi);
}

int
Expand Down Expand Up @@ -933,6 +851,7 @@ main(int argc, char *argv[])
exit(-1);
}
signal(SIGPIPE, DeadPipe);
signal(SIGALRM, HandleAlarm);

FScreenInit(dpy);
fd_width = GetFdWidth();
Expand Down Expand Up @@ -997,18 +916,87 @@ main(int argc, char *argv[])
/* Tell fvwm we're running */
SendFinishedStartupNotification(fd);

while (get_window()) /* */
;

sort_window_items();
if (wins_count) {
if (FvwmCascade)
cascade_windows();
else /* FvwmTile */
tile_windows();
}
Loop(fd);

free_resources();

return 0;
}

static void
Loop(int *fd)
{
FvwmPacket *packet = NULL;

/* Ten seconds should be enough to tile all the windows. This was
* tested on a desk which had 128 windows, and it took less than five
* seconds.
*/
alarm(10);

while (1) {
if ((packet = ReadFvwmPacket(fd[1])) == NULL)
DeadPipe(0);
process_message(packet->type, packet->body);
}
}

void
process_name(unsigned long type, unsigned long *body)
{
window_item *wi = wins;

while (wi != NULL && wi->w != body[0])
wi = wi->next;

if (wi == NULL)
return;

switch(type) {
case M_RES_NAME:
free(wi->resource);
wi->resource = fxstrdup((char *)(&body[3]));
break;
case M_RES_CLASS:
free(wi->class);
wi->class = fxstrdup((char *)(&body[3]));
break;
case M_ICON_NAME:
free(wi->icon_name);
wi->icon_name = fxstrdup((char *)(&body[3]));
break;
case M_WINDOW_NAME:
free(wi->name);
wi->name = fxstrdup((char *)(&body[3]));
break;
}
}

void process_message(unsigned long type, unsigned long *body)
{
switch(type)
{
case M_CONFIGURE_WINDOW:
if (is_init)
get_window(body);
break;
case M_RES_NAME:
case M_RES_CLASS:
case M_ICON_NAME:
case M_WINDOW_NAME:
process_name(type, body);
break;
case M_END_WINDOWLIST:
is_init = 0;
if (wins_count) {
sort_window_items();
if (FvwmCascade)
cascade_windows();
else /* FvwmTile */
tile_windows();
}
break;
default:
break;
}
}

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