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#include "xcb_reply.h"
#include <stdlib.h>
#include <xcb/xcbext.h>
struct node {
struct node *next;
unsigned int request;
generic_reply_handler handler;
void *data;
char handled;
};
struct reply_handlers {
pthread_mutex_t lock;
pthread_cond_t cond;
struct node *head;
xcb_connection_t *c;
pthread_t thread;
};
reply_handlers_t *alloc_reply_handlers(xcb_connection_t *c)
{
reply_handlers_t *ret = calloc(1, sizeof(reply_handlers_t));
if(ret)
{
static const pthread_mutex_t proto_lock = PTHREAD_MUTEX_INITIALIZER;
static const pthread_cond_t proto_cond = PTHREAD_COND_INITIALIZER;
ret->lock = proto_lock;
ret->cond = proto_cond;
ret->c = c;
}
return ret;
}
void free_reply_handlers(reply_handlers_t *h)
{
free(h);
}
xcb_connection_t *get_xcb_connection(reply_handlers_t *h)
{
return h->c;
}
static void insert_handler(reply_handlers_t *h, struct node *cur)
{
struct node **prev = &h->head;
while(*prev && (*prev)->request < cur->request)
prev = &(*prev)->next;
cur->next = *prev;
*prev = cur;
}
static void remove_handler(reply_handlers_t *h, struct node *cur)
{
struct node **prev = &h->head;
while(*prev && (*prev)->request < cur->request)
prev = &(*prev)->next;
if(!(*prev) || (*prev)->request != cur->request)
return;
*prev = cur->next;
free(cur);
}
static int process_replies(reply_handlers_t *h, int block)
{
int handled = 0;
pthread_mutex_lock(&h->lock);
pthread_cleanup_push((void (*)(void *)) pthread_mutex_unlock, &h->lock);
while(1)
{
struct node *cur = h->head;
xcb_generic_error_t *error;
void *reply;
pthread_mutex_unlock(&h->lock);
pthread_cleanup_push((void (*)(void *)) pthread_mutex_lock, &h->lock);
if(block)
reply = xcb_wait_for_reply(h->c, cur->request, &error);
else if(!xcb_poll_for_reply(h->c, cur->request, &reply, &error))
return handled;
if(reply || error)
{
cur->handler(cur->data, h->c, reply, error);
cur->handled = 1;
free(reply);
free(error);
}
handled |= cur->handled;
pthread_cleanup_pop(1);
if(!reply)
remove_handler(h, cur);
if(!h->head)
{
if(block)
pthread_cond_wait(&h->cond, &h->lock);
else
break;
}
}
pthread_cleanup_pop(1);
return handled;
}
int poll_replies(reply_handlers_t *h)
{
xcb_flush(h->c);
return process_replies(h, 0);
}
static void *reply_thread(void *h)
{
process_replies(h, 1);
return 0;
}
void start_reply_thread(reply_handlers_t *h)
{
pthread_create(&h->thread, 0, reply_thread, h);
}
void stop_reply_thread(reply_handlers_t *h)
{
pthread_cancel(h->thread);
pthread_join(h->thread, 0);
}
void add_reply_handler(reply_handlers_t *h, unsigned int request, generic_reply_handler handler, void *data)
{
struct node *cur = malloc(sizeof(struct node));
cur->request = request;
cur->handler = handler;
cur->data = data;
cur->handled = 0;
pthread_mutex_lock(&h->lock);
insert_handler(h, cur);
pthread_cond_broadcast(&h->cond);
pthread_mutex_unlock(&h->lock);
}
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