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#include <stdio.h>
#include <string.h>
#include "messagepump.h"
#include "threading.h"
typedef struct message_s {
uint32_t id;
uintptr_t ctx;
uint32_t p1;
uint32_t p2;
struct message_s *next;
} message_t;
enum { MAX_MESSAGES = 100 };
static message_t pool[MAX_MESSAGES];
static message_t *mfree;
static message_t *mqueue;
static message_t *mqtail;
static uintptr_t mutex;
static void
messagepump_reset (void);
int
messagepump_init (void) {
messagepump_reset ();
mutex = mutex_create ();
}
void
messagepump_free () {
mutex_lock (mutex);
messagepump_reset ();
mutex_free (mutex);
}
static void
messagepump_reset (void) {
mqueue = NULL;
mfree = NULL;
mqtail = NULL;
memset (pool, 0, sizeof (pool));
for (int i = 0; i < MAX_MESSAGES; i++) {
pool[i].next = mfree;
mfree = &pool[i];
}
}
int
messagepump_push (uint32_t id, uintptr_t ctx, uint32_t p1, uint32_t p2) {
if (!mfree) {
printf ("WARNING: message queue is full! message ignored (%d %p %d %d)\n", id, ctx, p1, p2);
return -1;
}
mutex_lock (mutex);
message_t *msg = mfree;
mfree = mfree->next;
if (mqtail) {
mqtail->next = msg;
}
mqtail = msg;
if (!mqueue) {
mqueue = msg;
}
msg->next = NULL;
msg->id = id;
msg->ctx = ctx;
msg->p1 = p1;
msg->p2 = p2;
mutex_unlock (mutex);
return 0;
}
int
messagepump_pop (uint32_t *id, uintptr_t *ctx, uint32_t *p1, uint32_t *p2) {
if (!mqueue) {
return -1;
}
mutex_lock (mutex);
*id = mqueue->id;
*ctx = mqueue->ctx;
*p1 = mqueue->p1;
*p2 = mqueue->p2;
message_t *next = mqueue->next;
mqueue->next = mfree;
mfree = mqueue;
mqueue = next;
if (!mqueue) {
mqtail = NULL;
}
mutex_unlock (mutex);
return 0;
}
int
messagepump_hasmessages (void) {
return mqueue ? 1 : 0;
}
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