struct Window {
MMapCache *cache;
- bool keep_always;
+ unsigned keep_always;
bool in_unused;
int prot;
c->window = NULL;
LIST_REMOVE(by_window, w->contexts, c);
- if (!w->contexts && !w->keep_always) {
+ if (!w->contexts && w->keep_always == 0) {
/* Not used anymore? */
LIST_PREPEND(unused, c->cache->unused, w);
if (!c->cache->last_unused)
assert(m->n_ref > 0);
assert(fd >= 0);
assert(size > 0);
- assert(ret);
c = hashmap_get(m->contexts, UINT_TO_PTR(context+1));
if (!c)
return 0;
}
- c->window->keep_always = c->window->keep_always || keep_always;
+ c->window->keep_always += keep_always;
- *ret = (uint8_t*) c->window->ptr + (offset - c->window->offset);
+ if (ret)
+ *ret = (uint8_t*) c->window->ptr + (offset - c->window->offset);
return 1;
}
assert(m->n_ref > 0);
assert(fd >= 0);
assert(size > 0);
- assert(ret);
f = hashmap_get(m->fds, INT_TO_PTR(fd + 1));
if (!f)
return -ENOMEM;
context_attach_window(c, w);
- w->keep_always = w->keep_always || keep_always;
+ w->keep_always += keep_always;
- *ret = (uint8_t*) w->ptr + (offset - w->offset);
+ if (ret)
+ *ret = (uint8_t*) w->ptr + (offset - w->offset);
return 1;
}
assert(m->n_ref > 0);
assert(fd >= 0);
assert(size > 0);
- assert(ret);
woffset = offset & ~((uint64_t) page_size() - 1ULL);
wsize = size + (offset - woffset);
c->window = w;
LIST_PREPEND(by_window, w->contexts, c);
- *ret = (uint8_t*) w->ptr + (offset - w->offset);
+ if (ret)
+ *ret = (uint8_t*) w->ptr + (offset - w->offset);
return 1;
}
assert(m->n_ref > 0);
assert(fd >= 0);
assert(size > 0);
- assert(ret);
/* Check whether the current context is the right one already */
r = try_context(m, fd, prot, context, keep_always, offset, size, ret);
return add_mmap(m, fd, prot, context, keep_always, offset, size, st, ret);
}
+int mmap_cache_release(
+ MMapCache *m,
+ int fd,
+ int prot,
+ unsigned context,
+ uint64_t offset,
+ size_t size) {
+
+ FileDescriptor *f;
+ Window *w;
+
+ assert(m);
+ assert(m->n_ref > 0);
+ assert(fd >= 0);
+ assert(size > 0);
+
+ f = hashmap_get(m->fds, INT_TO_PTR(fd + 1));
+ if (!f)
+ return -EBADF;
+
+ assert(f->fd == fd);
+
+ LIST_FOREACH(by_fd, w, f->windows)
+ if (window_matches(w, fd, prot, offset, size))
+ break;
+
+ if (!w)
+ return -ENOENT;
+
+ if (w->keep_always == 0)
+ return -ENOLCK;
+
+ w->keep_always -= 1;
+ return 0;
+}
+
void mmap_cache_close_fd(MMapCache *m, int fd) {
FileDescriptor *f;