void wait_for_more_jobs(void)
{
thread_mutex_lock(&jobs_mutex);
if(jobs_submitted==jobs_done){
thread_cond_wait(&wait_for_more_jobs_condition, &jobs_mutex);
}
thread_mutex_unlock(&jobs_mutex);
}
/**
* Retrieves the next item from the queue. If there are no
* items available, it will block until one becomes available.
* Once retrieved, the item is placed into the address specified by
* 'data'.
*/
int queue_pop(queue_t *queue, void **data)
{
int rv;
if (queue->terminated) {
return QUEUE_EOF; /* no more elements ever again */
}
rv = thread_mutex_lock(queue->one_big_mutex);
if (rv != 0) {
return rv;
}
/* Keep waiting until we wake up and find that the queue is not empty. */
if (queue_empty(queue)) {
if (!queue->terminated) {
queue->empty_waiters++;
rv = thread_cond_wait(queue->not_empty, queue->one_big_mutex);
queue->empty_waiters--;
if (rv != 0) {
thread_mutex_unlock(queue->one_big_mutex);
return rv;
}
}
/* If we wake up and it's still empty, then we were interrupted */
if (queue_empty(queue)) {
rv = thread_mutex_unlock(queue->one_big_mutex);
if (rv != 0) {
return rv;
}
if (queue->terminated) {
return QUEUE_EOF; /* no more elements ever again */
}
else {
return QUEUE_EINTR;
}
}
}
*data = queue->data[queue->out];
queue->nelts--;
queue->out = (queue->out + 1) % queue->bounds;
if (queue->full_waiters) {
rv = thread_cond_signal(queue->not_full);
if (rv != 0) {
thread_mutex_unlock(queue->one_big_mutex);
return rv;
}
}
rv = thread_mutex_unlock(queue->one_big_mutex);
return rv;
}
/**
* Push new data onto the queue. Blocks if the queue is full. Once
* the push operation has completed, it signals other threads waiting
* in queue_pop() that they may continue consuming sockets.
*/
int queue_push(queue_t *queue, void *data)
{
int rv;
if (queue->terminated) {
return QUEUE_EOF; /* no more elements ever again */
}
rv = thread_mutex_lock(queue->one_big_mutex);
if (rv != 0) {
return rv;
}
if (queue_full(queue)) {
if (!queue->terminated) {
queue->full_waiters++;
rv = thread_cond_wait(queue->not_full, queue->one_big_mutex);
queue->full_waiters--;
if (rv != 0) {
thread_mutex_unlock(queue->one_big_mutex);
return rv;
}
}
/* If we wake up and it's still empty, then we were interrupted */
if (queue_full(queue)) {
rv = thread_mutex_unlock(queue->one_big_mutex);
if (rv != 0) {
return rv;
}
if (queue->terminated) {
return QUEUE_EOF; /* no more elements ever again */
}
else {
return QUEUE_EINTR;
}
}
}
queue->data[queue->in] = data;
queue->in = (queue->in + 1) % queue->bounds;
queue->nelts++;
if (queue->empty_waiters) {
rv = thread_cond_signal(queue->not_empty);
if (rv != 0) {
thread_mutex_unlock(queue->one_big_mutex);
return rv;
}
}
rv = thread_mutex_unlock(queue->one_big_mutex);
return rv;
}
void wait_for_all_done(void)
{
thread_mutex_lock(&jobs_mutex);
if(jobs_submitted==jobs_done) {
jobs_free=0;
next_job_to_do=0;
thread_mutex_unlock(&jobs_mutex);
return;
}
thread_cond_wait(&all_done_condition, &jobs_mutex);
thread_mutex_unlock(&jobs_mutex);
}
void *thread_cruncher(int i)
{
while(1) {
wait_for_more_jobs();
thread_mutex_lock(&thread_num_mutex);
while(i>=num_threads)thread_cond_wait(&thread_not_needed, &thread_num_mutex);
thread_mutex_unlock(&thread_num_mutex);
while(do_single_job(i));
}
return NULL; /* make compiler happy */
}
int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
{
if (cond == NULL || mutex == NULL)
return_errno(EINVAL, EINVAL);
if (*cond == PTHREAD_COND_INITIALIZER)
if (pthread_cond_init(cond, NULL) != OK)
return errno;
if (*mutex == PTHREAD_MUTEX_INITIALIZER)
if (pthread_mutex_init(mutex, NULL) != OK)
return errno;
if (!thread_cond_wait((cond_t *)(*cond), (mutex_t *)(*mutex)))
return errno;
return OK;
}
static int
channel_get (lua_State *L)
{
struct channel *chan = checkudata(L, 1, CHANNEL_TYPENAME);
const msec_t timeout = lua_isnoneornil(L, 2)
? TIMEOUT_INFINITE : (msec_t) lua_tointeger(L, 2);
int nput;
int idx;
int i;
lua_settop(L, 1);
lua_getfenv(L, 1); /* storage */
lua_insert(L, 1);
sys_vm_leave();
thread_critsect_enter(&chan->mutex);
thread_cond_signal(&chan->get);
/* wait signal */
while (chan->n == 0) {
thread_cond_wait(&chan->put, &chan->mutex, timeout);
}
/* get from storage */
idx = chan->idx + 1;
lua_rawgeti(L, 1, idx);
nput = lua_tointeger(L, -1);
lua_pushnil(L);
lua_rawseti(L, 1, idx);
chan->idx = idx + nput;
for (i = chan->idx; i > idx; --i) {
lua_rawgeti(L, 1, i);
lua_pushnil(L);
lua_rawseti(L, 1, i);
}
if (chan->idx == chan->top) chan->idx = chan->top = 0;
chan->n--;
thread_critsect_leave(&chan->mutex);
sys_vm_enter();
return nput;
}
void *stats_connection(void *arg)
{
stats_connection_t *statcon = (stats_connection_t *)arg;
stats_event_t *local_event_queue = NULL;
mutex_t local_event_mutex;
stats_event_t *event;
/* increment the thread count */
thread_mutex_lock(&_stats_mutex);
_stats_threads++;
thread_mutex_unlock(&_stats_mutex);
thread_mutex_create(&local_event_mutex);
_atomic_get_and_register(&local_event_queue, &local_event_mutex);
while (_stats_running) {
thread_mutex_lock(&local_event_mutex);
event = _get_event_from_queue(&local_event_queue);
if (event != NULL) {
if (!_send_event_to_client(event, statcon->con)) {
_free_event(event);
thread_mutex_unlock(&local_event_mutex);
break;
}
_free_event(event);
} else {
thread_mutex_unlock(&local_event_mutex);
thread_cond_wait(&_event_signal_cond);
continue;
}
thread_mutex_unlock(&local_event_mutex);
}
thread_mutex_destroy(&local_event_mutex);
thread_mutex_lock(&_stats_mutex);
_stats_threads--;
thread_mutex_unlock(&_stats_mutex);
thread_exit(0);
return NULL;
}
/* this returns queued clients for the connection thread. headers are
* already provided, but need to be parsed.
*/
static connection_queue_t *_get_connection(void)
{
connection_queue_t *node = NULL;
/* common case, no new connections so don't bother taking locks */
if (_con_queue) {
node = (connection_queue_t *)_con_queue;
_con_queue = node->next;
if (_con_queue == NULL)
_con_queue_tail = &_con_queue;
node->next = NULL;
} else {
INFO("sleeping");
thread_cond_wait(_connection_cond);
INFO("awake");
}
return node;
}
ref_buffer *stream_wait_for_data(instance_t *stream)
{
ref_buffer *buffer;
queue_item *old;
thread_mutex_lock(&stream->queue->lock);
while(!stream->queue->head && !ices_config->shutdown && !stream->kill)
{
thread_mutex_unlock(&stream->queue->lock);
thread_cond_wait(&ices_config->queue_cond);
thread_mutex_lock(&stream->queue->lock);
}
if(ices_config->shutdown || stream->kill)
{
LOG_DEBUG0("Shutdown signalled: thread shutting down");
thread_mutex_unlock(&stream->queue->lock);
return NULL;
}
buffer = stream->queue->head->buf;
old = stream->queue->head;
stream->queue->head = stream->queue->head->next;
if(!stream->queue->head)
stream->queue->tail = NULL;
free(old);
stream->queue->length--;
thread_mutex_unlock(&stream->queue->lock);
/* ok, we pulled something off the queue and the queue is
* now empty - this means we're probably keeping up, so
* clear one of the errors. This way, very occasional errors
* don't cause eventual shutdown
*/
if(!stream->queue->head && stream->buffer_failures>0)
stream->buffer_failures--;
return buffer;
}
input_buffer *runner_wait_for_data(struct runner *run)
{
input_buffer *ib;
#ifdef USE_PIPES
if (read (run->fd[0], &ib, sizeof (ib)) < (ssize_t)sizeof (ib))
return NULL;
#else
while (run->pending == NULL || (run->pending && run->pending->next == NULL))
{
thread_cond_wait (&run->data_available);
if (ices_config->shutdown)
return NULL;
}
ib = run->pending;
run->pending = ib->next;
ib->next = NULL;
#endif
return ib;
}
static int
channel_put (lua_State *L)
{
struct sys_thread *td = sys_get_thread();
struct channel *chan = checkudata(L, 1, CHANNEL_TYPENAME);
int nput = lua_gettop(L) - 1;
if (!td) luaL_argerror(L, 0, "Threading not initialized");
if (!nput) luaL_argerror(L, 2, "data expected");
lua_getfenv(L, 1); /* get the storage table */
lua_insert(L, 1);
sys_vm_leave();
thread_critsect_enter(&chan->mutex);
thread_cond_signal(&chan->put);
/* move the data to storage */
{
int top = chan->top;
lua_pushinteger(L, nput);
do {
lua_rawseti(L, 1, ++top);
} while (nput--);
chan->top = top;
chan->n++;
}
while (chan->n > chan->max) {
thread_cond_wait(&chan->get, &chan->mutex, TIMEOUT_INFINITE);
}
thread_critsect_leave(&chan->mutex);
sys_vm_enter();
return 0;
}
void *metadata_thread_signal(void *arg)
{
char buf[1024];
input_module_t *mod = arg;
while(1)
{
char **md = NULL;
int comments = 0;
FILE *file;
while(metadata_update_signalled == 0)
{
thread_cond_wait(&ices_config->event_pending_cond);
if (ices_config->shutdown)
{
LOG_INFO0 ("metadata thread shutting down");
return NULL;
}
LOG_DEBUG0("meta thread wakeup");
}
metadata_update_signalled = 0;
file = fopen(ices_config->metadata_filename, "r");
if(!file) {
LOG_WARN2("Failed to open file \"%s\" for metadata update: %s",
ices_config->metadata_filename, strerror(errno));
continue;
}
LOG_DEBUG1("reading metadata from \"%s\"", ices_config->metadata_filename);
while(fgets(buf, 1024, file))
{
if(buf[0] == '\n')
break;
else
{
if(buf[strlen(buf)-1] == '\n')
buf[strlen(buf)-1] = 0;
md = realloc(md, (comments+2)*sizeof(char *));
md[comments] = malloc(strlen(buf)+1);
memcpy(md[comments], buf, strlen(buf)+1);
comments++;
LOG_INFO2 ("tag %d is %s", comments, buf);
}
}
fclose(file);
if(md) /* Don't update if there's nothing there */
{
md[comments]=0;
/* Now, let's actually use the new data */
LOG_INFO0("Updating metadata");
mod->handle_event(mod,EVENT_METADATAUPDATE,md);
}
else
LOG_INFO0("No metadata has been read");
}
}
inline bool tuple_fifo::wait_for_writer(int timeout_ms) {
_num_waits_on_remove++;
return thread_cond_wait(_reader_notify, _lock, timeout_ms);
}
inline void tuple_fifo::wait_for_reader() {
_num_waits_on_insert++;
thread_cond_wait(_writer_notify, _lock);
}