Commit 54957d4f authored by David Anderson's avatar David Anderson

*** empty log message ***

svn path=/trunk/boinc/; revision=2287
parent 662e8ffa
......@@ -6206,3 +6206,12 @@ Karl 2003/09/05
David Sept 6 2003
- fixed bug where do_select wasn't sleeping
when there are no fds (doh!!)
......@@ -296,13 +296,11 @@ int NET_XFER_SET::remove(NET_XFER* nxp) {
bool NET_XFER_SET::poll() {
double bytes_xferred;
int retval;
struct timeval timeout;
time_t t = time(0);
bool action = false;
while (1) {
timeout.tv_sec = timeout.tv_usec = 0;
retval = do_select(bytes_xferred, timeout);
retval = do_select(bytes_xferred, 0);
if (retval) break;
if (bytes_xferred == 0) break;
action = true;
......@@ -311,6 +309,11 @@ bool NET_XFER_SET::poll() {
return action;
static void double_to_timeval(double x, timeval& t) {
t.tv_sec = (int)x;
t.tv_usec = (int)(1000000*(x - (int)x));
// Wait at most x seconds for network I/O to become possible,
// then do up to about .5 seconds of I/O.
// This is used only by the cmdline client, to sleep without slowing down I/O.
......@@ -318,11 +321,8 @@ bool NET_XFER_SET::poll() {
int NET_XFER_SET::net_sleep(double x) {
int retval;
double bytes_xferred;
struct timeval timeout;
timeout.tv_sec = (int)x;
timeout.tv_usec = (int)(1000000*(x - (int)x));
retval = do_select(bytes_xferred, timeout);
retval = do_select(bytes_xferred, x);
if (retval) return retval;
if (bytes_xferred) {
return poll();
......@@ -334,10 +334,11 @@ int NET_XFER_SET::net_sleep(double x) {
// then do I/O on as many sockets as possible, subject to rate limits
// Transfer at most one block per socket.
int NET_XFER_SET::do_select(double& bytes_transferred, timeval& timeout) {
int NET_XFER_SET::do_select(double& bytes_transferred, double timeout) {
int n, fd, retval, nsocks_queried;
socklen_t i;
NET_XFER *nxp;
struct timeval tv;
ScopeMessages scope_messages(log_messages, ClientMessages::DEBUG_NET_XFER);
......@@ -387,8 +388,13 @@ int NET_XFER_SET::do_select(double& bytes_transferred, timeval& timeout) {
FD_SET(nxp->socket, &error_fds);
if (nsocks_queried==0) return 0;
n = select(FD_SETSIZE, &read_fds, &write_fds, &error_fds, &timeout);
if (nsocks_queried==0) {
return 0;
double_to_timeval(timeout, tv);
n = select(FD_SETSIZE, &read_fds, &write_fds, &error_fds, &tv);
"NET_XFER_SET::do_select(): queried %d, returned %d\n",
nsocks_queried, n
......@@ -89,7 +89,7 @@ public:
int remove(NET_XFER*);
bool poll();
int net_sleep(double);
int do_select(double& bytes_transferred, struct timeval& timeout);
int do_select(double& bytes_transferred, double timeout);
NET_XFER* lookup_fd(int); // lookup by fd
void check_active(bool&, bool&);
......@@ -35,7 +35,6 @@ For example, instead of
the application might use
char resolved_name[256];
retval = boinc_resolve_filename(\"my_file\", resolved_name);
......@@ -70,8 +69,16 @@ then call
void boinc_checkpoint_completed();
A call to <tt>boinc_time_to_checkpoint()</tt> is extremely fast,
so there is little penalty in calling it frequently.
<tt>boinc_time_to_checkpoint()</tt> is fast
(it usually makes no system calls),
so can be called frequently (hundreds or thousands of times a second).
<tt>boinc_time_to_checkpoint()</tt> performs other time-based functions;
e.g. it periodically measures the application's CPU time and
reports it to the core client.
So, even for applications that don't do checkpointing,
it should be called at least once a second.
<h3>Atomic file update</h3>
......@@ -111,14 +118,13 @@ This is done using
<h3>Communicating with the core client</h3>
The core client GUI displays the percent done of workunits in progress.
To keep this display current, an application should
periodically call
To keep this display current, an application should periodically call
boinc_fraction_done(double fraction_done);
The <tt>fraction_done</tt> argument is a rough estimate of the
workunit fraction complete (0 to 1).
This function is extremely fast and can be called often.
This function is fast and can be called frequently.
The following functions get information from the core client;
......@@ -150,7 +156,7 @@ list_item("team_expavg_credit", " team's recent average work per day.");
echo "
It may call
An application may call
int boinc_cpu_time(double &cpu_time, double& working_set_size);
......@@ -175,7 +175,8 @@ void boinc_sleep(double seconds) {
int x = (int)fmod(seconds*1000000,1000000);
if (x) usleep(x);
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment