void
NativeStateDRM::flip()
{
gbm_bo* next = gbm_surface_lock_front_buffer(surface_);
fb_ = fb_get_from_bo(next);
unsigned int waiting(1);
if (!crtc_set_) {
int status = drmModeSetCrtc(fd_, encoder_->crtc_id, fb_->fb_id, 0, 0,
&connector_->connector_id, 1, mode_);
if (status >= 0) {
crtc_set_ = true;
bo_ = next;
}
else {
Log::error("Failed to set crtc: %d\n", status);
}
return;
}
int status = drmModePageFlip(fd_, encoder_->crtc_id, fb_->fb_id,
DRM_MODE_PAGE_FLIP_EVENT, &waiting);
if (status < 0) {
Log::error("Failed to enqueue page flip: %d\n", status);
return;
}
fd_set fds;
FD_ZERO(&fds);
FD_SET(fd_, &fds);
drmEventContext evCtx;
evCtx.version = DRM_EVENT_CONTEXT_VERSION;
evCtx.page_flip_handler = page_flip_handler;
while (waiting) {
status = select(fd_ + 1, &fds, 0, 0, 0);
if (status < 0) {
// Most of the time, select() will return an error because the
// user pressed Ctrl-C. So, only print out a message in debug
// mode, and just check for the likely condition and release
// the current buffer object before getting out.
Log::debug("Error in select\n");
if (should_quit()) {
gbm_surface_release_buffer(surface_, bo_);
bo_ = next;
}
return;
}
drmHandleEvent(fd_, &evCtx);
}
gbm_surface_release_buffer(surface_, bo_);
bo_ = next;
}
/*
* n1
* Polls the user for the name of a file and a node.
* Sends the file character by character to the node via special FIFO-based protocol.
*/
int main(int argc, char *argv[])
{
char *filename, *contents;
long n_chars;
int write_child;
int node;
packet p;
do {
// Get filename and node number from user.
get_user_input(&filename, &node);
// Get contents of file.
n_chars = get_file_contents(filename, &contents);
// Send file data to node.
send_data(1, node, n_chars, contents);
// Receive acknowledgement packet from node.
recv_acknowledge(1, node);
free(filename);
free(contents);
} while (!should_quit());
// Send exit message to all child nodes.
p.data = END_OF_TRANSMISSION;
for (int i = NUM_NODES; i > 1; i--) {
write_child = get_link(1, i, WRITE);
p.dest = i;
send_packet(write_child, p);
close(write_child);
recv_acknowledge(1, i);
}
return 0;
}
