void adquireReadLock(Bloqueio *bloqueio){
sem_adquire(&bloqueio->mutex, 0);
bloqueio->leitor_count++;
// Quando for o primeiro leitor, diz a todos os outros
// que o banco de dados está sendo lido
if (bloqueio->leitor_count == 1)
sem_adquire(&bloqueio->db, 0);
sem_libera(&bloqueio->mutex, 0);
}
void liberaReadLock(Bloqueio *bloqueio){
sem_adquire(&bloqueio->mutex, 0);
bloqueio->leitor_count--;
// Quando é o último leitor, diz a todos os outros
// que o banco de dados não está sendo lido
if (bloqueio->leitor_count == 0)
sem_libera(&bloqueio->db, 0);
sem_libera(&bloqueio->mutex, 0);
}
void adquireWriteLock(Bloqueio *bloqueio){
sem_adquire(&bloqueio->db, 0);
}
ret_t
cherokee_spawner_spawn (cherokee_buffer_t *binary,
cherokee_buffer_t *user,
uid_t uid,
gid_t gid,
int env_inherited,
char **envp,
cherokee_logger_writer_t *error_writer,
pid_t *pid_ret)
{
#ifdef HAVE_SYSV_SEMAPHORES
char **n;
int *pid_shm;
int pid_prev;
int k;
int phase;
int envs = 0;
cherokee_buffer_t tmp = CHEROKEE_BUF_INIT;
#define ALIGN4(buf) \
while (buf.len & 0x3) { \
cherokee_buffer_add_char (&buf, '\0'); \
}
/* Check it's initialized
*/
if ((! _active) ||
(cherokee_spawn_shared.mem == NULL))
{
TRACE (ENTRIES, "Spawner is not active. Returning: %s\n", binary->buf);
return ret_deny;
}
/* Lock the monitor mutex
*/
k = CHEROKEE_MUTEX_TRY_LOCK (&spawning_mutex);
if (k) {
return ret_eagain;
}
/* Build the string
* The first character of each block is a mark.
*/
cherokee_buffer_ensure_size (&tmp, SPAWN_SHARED_LEN);
/* 1.- Executable */
phase = 0xF0;
cherokee_buffer_add (&tmp, (char *)&phase, sizeof(int));
cherokee_buffer_add (&tmp, (char *)&binary->len, sizeof(int));
cherokee_buffer_add_buffer (&tmp, binary);
cherokee_buffer_add_char (&tmp, '\0');
ALIGN4 (tmp);
/* 2.- UID & GID */
phase = 0xF1;
cherokee_buffer_add (&tmp, (char *)&phase, sizeof(int));
cherokee_buffer_add (&tmp, (char *)&user->len, sizeof(int));
cherokee_buffer_add_buffer (&tmp, user);
cherokee_buffer_add_char (&tmp, '\0');
ALIGN4(tmp);
cherokee_buffer_add (&tmp, (char *)&uid, sizeof(uid_t));
cherokee_buffer_add (&tmp, (char *)&gid, sizeof(gid_t));
/* 3.- Environment */
phase = 0xF2;
cherokee_buffer_add (&tmp, (char *)&phase, sizeof(int));
for (n=envp; *n; n++) {
envs ++;
}
cherokee_buffer_add (&tmp, (char *)&env_inherited, sizeof(int));
cherokee_buffer_add (&tmp, (char *)&envs, sizeof(int));
for (n=envp; *n; n++) {
int len = strlen(*n);
cherokee_buffer_add (&tmp, (char *)&len, sizeof(int));
cherokee_buffer_add (&tmp, *n, len);
cherokee_buffer_add_char (&tmp, '\0');
ALIGN4(tmp);
}
/* 4.- Error log */
phase = 0xF3;
cherokee_buffer_add (&tmp, (char *)&phase, sizeof(int));
write_logger (&tmp, error_writer);
ALIGN4 (tmp);
/* 5.- PID (will be rewritten by the other side) */
phase = 0xF4;
cherokee_buffer_add (&tmp, (char *)&phase, sizeof(int));
pid_shm = (int *) (((char *)cherokee_spawn_shared.mem) + tmp.len);
k = *pid_ret;
pid_prev = *pid_ret;
cherokee_buffer_add (&tmp, (char *)&k, sizeof(int));
/* Copy it to the shared memory
*/
if (unlikely (tmp.len > SPAWN_SHARED_LEN)) {
goto error;
}
memcpy (cherokee_spawn_shared.mem, tmp.buf, tmp.len);
cherokee_buffer_mrproper (&tmp);
/* Wake up the spawning thread
*/
sem_unlock (cherokee_spawn_sem, SEM_LAUNCH_START);
/* Wait for the PID
*/
sem_adquire (cherokee_spawn_sem, SEM_LAUNCH_READY);
if (*pid_shm == -1) {
TRACE(ENTRIES, "Could not get the PID of: '%s'\n", binary->buf);
goto error;
}
if (*pid_shm == pid_prev) {
TRACE(ENTRIES, "Could not the new PID, previously it was %d\n", pid_prev);
goto error;
}
TRACE(ENTRIES, "Successfully launched PID=%d\n", *pid_shm);
*pid_ret = *pid_shm;
CHEROKEE_MUTEX_UNLOCK (&spawning_mutex);
return ret_ok;
error:
CHEROKEE_MUTEX_UNLOCK (&spawning_mutex);
return ret_error;
#else
return ret_not_found;
#endif /* HAVE_SYSV_SEMAPHORES */
}
