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#include "uwsgi.h"
extern struct uwsgi_server uwsgi;
void uwsgi_init_queue() {
if (!uwsgi.queue_blocksize)
uwsgi.queue_blocksize = 8192;
if ((uwsgi.queue_blocksize * uwsgi.queue_size) % uwsgi.page_size != 0) {
uwsgi_log("invalid queue size/blocksize %llu: must be a multiple of memory page size (%d bytes)\n", (unsigned long long) uwsgi.queue_blocksize, uwsgi.page_size);
exit(1);
}
if (uwsgi.queue_store) {
uwsgi.queue_filesize = uwsgi.queue_blocksize * uwsgi.queue_size + 16;
int queue_fd;
struct stat qst;
if (stat(uwsgi.queue_store, &qst)) {
uwsgi_log("creating a new queue store file: %s\n", uwsgi.queue_store);
queue_fd = open(uwsgi.queue_store, O_CREAT | O_RDWR, S_IRUSR | S_IWUSR);
if (queue_fd >= 0) {
// fill the queue store
if (ftruncate(queue_fd, uwsgi.queue_filesize)) {
uwsgi_log("ftruncate()");
exit(1);
}
}
}
else {
if ((size_t) qst.st_size != uwsgi.queue_filesize || !S_ISREG(qst.st_mode)) {
uwsgi_log("invalid queue store file. Please remove it or fix queue blocksize/items to match its size\n");
exit(1);
}
queue_fd = open(uwsgi.queue_store, O_CREAT | O_RDWR, S_IRUSR | S_IWUSR);
uwsgi_log("recovered queue from backing store file: %s\n", uwsgi.queue_store);
}
if (queue_fd < 0) {
uwsgi_error_open(uwsgi.queue_store);
exit(1);
}
uwsgi.queue = mmap(NULL, uwsgi.queue_filesize, PROT_READ | PROT_WRITE, MAP_SHARED, queue_fd, 0);
// fix header
uwsgi.queue_header = uwsgi.queue;
uwsgi.queue += 16;
close(queue_fd);
}
else {
uwsgi.queue = mmap(NULL, (uwsgi.queue_blocksize * uwsgi.queue_size) + 16, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANON, -1, 0);
// fix header
uwsgi.queue_header = uwsgi.queue;
uwsgi.queue += 16;
uwsgi.queue_header->pos = 0;
uwsgi.queue_header->pull_pos = 0;
}
if (uwsgi.queue == MAP_FAILED) {
uwsgi_error("mmap()");
exit(1);
}
uwsgi.queue_lock = uwsgi_rwlock_init("queue");
uwsgi_log("*** Queue subsystem initialized: %luMB preallocated ***\n", (uwsgi.queue_blocksize * uwsgi.queue_size) / (1024 * 1024));
}
char *uwsgi_queue_get(uint64_t index, uint64_t * size) {
struct uwsgi_queue_item *uqi;
char *ptr = (char *) uwsgi.queue;
if (index >= uwsgi.queue_size)
return NULL;
ptr = ptr + (uwsgi.queue_blocksize * index);
uqi = (struct uwsgi_queue_item *) ptr;
*size = uqi->size;
return ptr + sizeof(struct uwsgi_queue_item);
}
char *uwsgi_queue_pop(uint64_t * size) {
struct uwsgi_queue_item *uqi;
char *ptr = (char *) uwsgi.queue;
if (uwsgi.queue_header->pos == 0) {
uwsgi.queue_header->pos = uwsgi.queue_size - 1;
}
else {
uwsgi.queue_header->pos--;
}
ptr = ptr + (uwsgi.queue_blocksize * uwsgi.queue_header->pos);
uqi = (struct uwsgi_queue_item *) ptr;
if (!uqi->size)
return NULL;
*size = uqi->size;
// remove item
uqi->size = 0;
return ptr + sizeof(struct uwsgi_queue_item);
}
char *uwsgi_queue_pull(uint64_t * size) {
struct uwsgi_queue_item *uqi;
char *ptr = (char *) uwsgi.queue;
ptr = ptr + (uwsgi.queue_blocksize * uwsgi.queue_header->pull_pos);
uqi = (struct uwsgi_queue_item *) ptr;
if (!uqi->size)
return NULL;
*size = uqi->size;
uwsgi.queue_header->pull_pos++;
if (uwsgi.queue_header->pull_pos >= uwsgi.queue_size)
uwsgi.queue_header->pull_pos = 0;
// remove item
uqi->size = 0;
return ptr + sizeof(struct uwsgi_queue_item);
}
int uwsgi_queue_push(char *message, uint64_t size) {
struct uwsgi_queue_item *uqi;
char *ptr = (char *) uwsgi.queue;
if (size > uwsgi.queue_blocksize - sizeof(struct uwsgi_queue_item))
return 0;
if (!size)
return 0;
ptr = ptr + (uwsgi.queue_blocksize * uwsgi.queue_header->pos);
uqi = (struct uwsgi_queue_item *) ptr;
ptr += sizeof(struct uwsgi_queue_item);
uqi->size = size;
uqi->ts = uwsgi_now();
memcpy(ptr, message, size);
uwsgi.queue_header->pos++;
if (uwsgi.queue_header->pos >= uwsgi.queue_size)
uwsgi.queue_header->pos = 0;
return 1;
}
int uwsgi_queue_set(uint64_t pos, char *message, uint64_t size) {
struct uwsgi_queue_item *uqi;
char *ptr = (char *) uwsgi.queue;
if (size > uwsgi.queue_blocksize + sizeof(struct uwsgi_queue_item))
return 0;
if (!size)
return 0;
if (pos >= uwsgi.queue_size)
return 0;
ptr = ptr + (uwsgi.queue_blocksize * pos);
uqi = (struct uwsgi_queue_item *) ptr;
ptr += sizeof(struct uwsgi_queue_item);
uqi->size = size;
uqi->ts = uwsgi_now();
memcpy(ptr, message, size);
return 1;
}
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