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#include "common.h"
#include <unistd.h>
typedef struct itc_message_s itc_message;
struct itc_message_s {
int number;
void *data;
itc_message *older, *newer;
};
typedef struct {
itc_message *newest, *oldest;
SDL_mutex *mutex;
} itc_chan;
void itc_chan_create(itc_chan *chan)
{
memset(chan, 0, sizeof(itc_chan));
chan->mutex = SDL_CreateMutex();
assert(chan->mutex);
}
void itc_chan_destroy(itc_chan *chan)
{
// todo: free queue
SDL_DestroyMutex(chan->mutex);
}
void itc_chan_push(itc_chan *chan, int number, void *data)
{
itc_message *msg;
msg = calloc(1, sizeof(itc_message));
assert(msg);
msg->number = number;
msg->data = data;
SDL_LockMutex(chan->mutex);
if (!chan->oldest) {
chan->oldest = msg;
chan->newest = msg;
} else {
/*
* head <---> ... <---> tail
*
*/
chan->newest->newer = msg;
msg->older = chan->newest;
chan->newest = msg;
}
SDL_UnlockMutex(chan->mutex);
}
int itc_chan_pop(itc_chan *chan, int *number, void **data)
{
itc_message *msg;
SDL_LockMutex(chan->mutex);
if (!chan->oldest) {
SDL_UnlockMutex(chan->mutex);
return 1;
}
msg = chan->oldest;
if (msg->newer) {
msg->newer->older = NULL;
chan->oldest = msg->newer;
} else {
chan->newest = NULL;
chan->oldest = NULL;
}
SDL_UnlockMutex(chan->mutex);
*number = msg->number;
*data = msg->data;
free(msg);
return 0;
}
itc_chan gulg_chan;
int gulgulator(void *unused)
{
int cmd_num;
void *cmd_data;
while (1) {
while (!itc_chan_pop(&gulg_chan, &cmd_num, &cmd_data)) {
printf("gulgulator: pop %i %p\n", cmd_num, cmd_data);
}
usleep(100 * 1000);
}
}
void itc_test(void)
{
SDL_Thread *thread;
char line[512];
itc_chan_create(&gulg_chan);
thread = SDL_CreateThread(gulgulator, "gulgulator", NULL);
while (1) {
int cmd_num;
printf("> ");
fflush(stdout);
if (!fgets(line, sizeof(line), stdin))
break;
cmd_num = atoi(line);
printf("main: push %i %p\n", cmd_num, 0xDEADBEEF);
itc_chan_push(&gulg_chan, cmd_num, (void*)0xDEADBEEF);
}
printf("EOF\n");
SDL_WaitThread(thread, NULL);
}
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