int64 io_canwrite() {
io_entry* e;
if (first_writeable==-1)
#ifdef HAVE_SIGIO
{
if (alt_firstwrite>=0 && (e=array_get(&io_fds,sizeof(io_entry),alt_firstwrite)) && e->canwrite) {
debug_printf(("io_canwrite: normal write queue is empty, swapping in alt write queue (starting with %ld)\n",alt_firstwrite));
first_writeable=alt_firstwrite;
alt_firstwrite=-1;
} else
return -1;
}
#else
return -1;
#endif
for (;;) {
int64 r;
e=array_get(&io_fds,sizeof(io_entry),first_writeable);
if (!e) break;
r=first_writeable;
first_writeable=e->next_write;
e->next_write=-1;
debug_printf(("io_canwrite: dequeue %lld from normal write queue (next is %ld)\n",r,first_writeable));
if (e->wantwrite &&
#ifdef __MINGW32__
(e->canwrite || e->sendfilequeued==1)
#else
e->canwrite
#endif
) {
#ifdef HAVE_SIGIO
e->next_write=alt_firstwrite;
alt_firstwrite=r;
debug_printf(("io_canwrite: enqueue %ld in alt write queue (next is %ld)\n",alt_firstwrite,e->next_write));
if (io_waitmode!=_SIGIO)
#endif
e->canwrite=0;
if (!e->kernelwantwrite)
io_wantwrite_really(r,e);
return r;
}
}
return -1;
}
void
io_wantwrite(fd_t d) {
io_entry* e = iarray_get(io_getfds(), d);
if(!e)
return;
if(e->wantwrite && e->kernelwantwrite)
return;
if(e->canwrite) {
e->next_write = first_writeable;
first_writeable = d;
e->wantwrite = 1;
return;
}
/* the harder case: do as before */
if(!e->kernelwantwrite)
io_wantwrite_really(d, e);
else
e->wantwrite = 1;
}
