CAMLprim value unix_select(value readfds, value writefds, value exceptfds,
value timeout)
{
fd_set read, write, except;
int maxfd;
double tm;
struct timeval tv;
struct timeval * tvp;
int retcode;
value res;
Begin_roots3 (readfds, writefds, exceptfds);
maxfd = -1;
fdlist_to_fdset(readfds, &read, &maxfd);
fdlist_to_fdset(writefds, &write, &maxfd);
fdlist_to_fdset(exceptfds, &except, &maxfd);
tm = Double_val(timeout);
if (tm < 0.0)
tvp = (struct timeval *) NULL;
else {
tv.tv_sec = (int) tm;
tv.tv_usec = (int) (1e6 * (tm - tv.tv_sec));
tvp = &tv;
}
enter_blocking_section();
retcode = select(maxfd + 1, &read, &write, &except, tvp);
leave_blocking_section();
if (retcode == -1) uerror("select", Nothing);
readfds = fdset_to_fdlist(readfds, &read);
writefds = fdset_to_fdlist(writefds, &write);
exceptfds = fdset_to_fdlist(exceptfds, &except);
res = alloc_small(3, 0);
Field(res, 0) = readfds;
Field(res, 1) = writefds;
Field(res, 2) = exceptfds;
End_roots();
return res;
}
CAMLprim value unix_select(value readfds, value writefds, value exceptfds, value timeout)
{
/* Event associated to handle */
DWORD nEventsCount;
DWORD nEventsMax;
HANDLE *lpEventsDone;
/* Data for all handles */
LPSELECTDATA lpSelectData;
LPSELECTDATA iterSelectData;
/* Iterator for results */
LPSELECTRESULT iterResult;
/* Iterator */
DWORD i;
/* Error status */
DWORD err;
/* Time to wait */
DWORD milliseconds;
/* Is there static select data */
BOOL hasStaticData = FALSE;
/* Wait return */
DWORD waitRet;
/* Set of handle */
SELECTHANDLESET hds;
DWORD hdsMax;
LPHANDLE hdsData;
/* Length of each list */
DWORD readfds_len;
DWORD writefds_len;
DWORD exceptfds_len;
CAMLparam4 (readfds, writefds, exceptfds, timeout);
CAMLlocal5 (read_list, write_list, except_list, res, l);
CAMLlocal1 (fd);
fd_set read, write, except;
double tm;
struct timeval tv;
struct timeval * tvp;
DEBUG_PRINT("in select");
err = 0;
tm = Double_val(timeout);
if (readfds == Val_int(0) && writefds == Val_int(0) && exceptfds == Val_int(0)) {
DEBUG_PRINT("nothing to do");
if ( tm > 0.0 ) {
enter_blocking_section();
Sleep( (int)(tm * 1000));
leave_blocking_section();
}
read_list = write_list = except_list = Val_int(0);
} else {
if (fdlist_to_fdset(readfds, &read) && fdlist_to_fdset(writefds, &write) && fdlist_to_fdset(exceptfds, &except)) {
DEBUG_PRINT("only sockets to select on, using classic select");
if (tm < 0.0) {
tvp = (struct timeval *) NULL;
} else {
tv.tv_sec = (int) tm;
tv.tv_usec = (int) (1e6 * (tm - (int) tm));
tvp = &tv;
}
enter_blocking_section();
if (select(FD_SETSIZE, &read, &write, &except, tvp) == -1) {
err = WSAGetLastError();
DEBUG_PRINT("Error %ld occurred", err);
}
leave_blocking_section();
if (err) {
DEBUG_PRINT("Error %ld occurred", err);
win32_maperr(err);
uerror("select", Nothing);
}
read_list = fdset_to_fdlist(readfds, &read);
write_list = fdset_to_fdlist(writefds, &write);
except_list = fdset_to_fdlist(exceptfds, &except);
} else {
nEventsCount = 0;
nEventsMax = 0;
lpEventsDone = NULL;
lpSelectData = NULL;
iterSelectData = NULL;
iterResult = NULL;
hasStaticData = 0;
waitRet = 0;
readfds_len = caml_list_length(readfds);
writefds_len = caml_list_length(writefds);
exceptfds_len = caml_list_length(exceptfds);
hdsMax = MAX(readfds_len, MAX(writefds_len, exceptfds_len));
hdsData = (HANDLE *)caml_stat_alloc(sizeof(HANDLE) * hdsMax);
if (tm >= 0.0)
{
milliseconds = 1000 * tm;
DEBUG_PRINT("Will wait %d ms", milliseconds);
}
else
{
milliseconds = INFINITE;
}
/* Create list of select data, based on the different list of fd to watch */
DEBUG_PRINT("Dispatch read fd");
handle_set_init(&hds, hdsData, hdsMax);
i=0;
for (l = readfds; l != Val_int(0); l = Field(l, 1))
{
fd = Field(l, 0);
if (!handle_set_mem(&hds, Handle_val(fd)))
{
handle_set_add(&hds, Handle_val(fd));
lpSelectData = select_data_dispatch(lpSelectData, SELECT_MODE_READ, fd, i++);
}
else
{
DEBUG_PRINT("Discarding handle %x which is already monitor for read", Handle_val(fd));
}
}
handle_set_reset(&hds);
DEBUG_PRINT("Dispatch write fd");
handle_set_init(&hds, hdsData, hdsMax);
i=0;
for (l = writefds; l != Val_int(0); l = Field(l, 1))
{
fd = Field(l, 0);
if (!handle_set_mem(&hds, Handle_val(fd)))
{
handle_set_add(&hds, Handle_val(fd));
lpSelectData = select_data_dispatch(lpSelectData, SELECT_MODE_WRITE, fd, i++);
}
else
{
DEBUG_PRINT("Discarding handle %x which is already monitor for write", Handle_val(fd));
}
}
handle_set_reset(&hds);
DEBUG_PRINT("Dispatch exceptional fd");
handle_set_init(&hds, hdsData, hdsMax);
i=0;
for (l = exceptfds; l != Val_int(0); l = Field(l, 1))
{
fd = Field(l, 0);
if (!handle_set_mem(&hds, Handle_val(fd)))
{
handle_set_add(&hds, Handle_val(fd));
lpSelectData = select_data_dispatch(lpSelectData, SELECT_MODE_EXCEPT, fd, i++);
}
else
{
DEBUG_PRINT("Discarding handle %x which is already monitor for exceptional", Handle_val(fd));
}
}
handle_set_reset(&hds);
/* Building the list of handle to wait for */
DEBUG_PRINT("Building events done array");
nEventsMax = list_length((LPLIST)lpSelectData);
nEventsCount = 0;
lpEventsDone = (HANDLE *)caml_stat_alloc(sizeof(HANDLE) * nEventsMax);
iterSelectData = lpSelectData;
while (iterSelectData != NULL)
{
/* Check if it is static data. If this is the case, launch everything
* but don't wait for events. It helps to test if there are events on
* any other fd (which are not static), knowing that there is at least
* one result (the static data).
*/
if (iterSelectData->EType == SELECT_TYPE_STATIC)
{
hasStaticData = TRUE;
};
/* Execute APC */
if (iterSelectData->funcWorker != NULL)
{
iterSelectData->lpWorker =
worker_job_submit(
iterSelectData->funcWorker,
(void *)iterSelectData);
DEBUG_PRINT("Job submitted to worker %x", iterSelectData->lpWorker);
lpEventsDone[nEventsCount] = worker_job_event_done(iterSelectData->lpWorker);
nEventsCount++;
};
iterSelectData = LIST_NEXT(LPSELECTDATA, iterSelectData);
};
DEBUG_PRINT("Need to watch %d workers", nEventsCount);
/* Processing select itself */
enter_blocking_section();
/* There are worker started, waiting to be monitored */
if (nEventsCount > 0)
{
/* Waiting for event */
if (err == 0 && !hasStaticData)
{
DEBUG_PRINT("Waiting for one select worker to be done");
switch (WaitForMultipleObjects(nEventsCount, lpEventsDone, FALSE, milliseconds))
{
case WAIT_FAILED:
err = GetLastError();
break;
case WAIT_TIMEOUT:
DEBUG_PRINT("Select timeout");
break;
default:
DEBUG_PRINT("One worker is done");
break;
};
}
/* Ordering stop to every worker */
DEBUG_PRINT("Sending stop signal to every select workers");
iterSelectData = lpSelectData;
while (iterSelectData != NULL)
{
if (iterSelectData->lpWorker != NULL)
{
worker_job_stop(iterSelectData->lpWorker);
};
iterSelectData = LIST_NEXT(LPSELECTDATA, iterSelectData);
};
DEBUG_PRINT("Waiting for every select worker to be done");
switch (WaitForMultipleObjects(nEventsCount, lpEventsDone, TRUE, INFINITE))
{
case WAIT_FAILED:
err = GetLastError();
break;
default:
DEBUG_PRINT("Every worker is done");
break;
}
}
/* Nothing to monitor but some time to wait. */
else if (!hasStaticData)
{
Sleep(milliseconds);
}
leave_blocking_section();
DEBUG_PRINT("Error status: %d (0 is ok)", err);
/* Build results */
if (err == 0)
{
DEBUG_PRINT("Building result");
read_list = Val_unit;
write_list = Val_unit;
except_list = Val_unit;
iterSelectData = lpSelectData;
while (iterSelectData != NULL)
{
for (i = 0; i < iterSelectData->nResultsCount; i++)
{
iterResult = &(iterSelectData->aResults[i]);
l = alloc_small(2, 0);
Store_field(l, 0, find_handle(iterResult, readfds, writefds, exceptfds));
switch (iterResult->EMode)
{
case SELECT_MODE_READ:
Store_field(l, 1, read_list);
read_list = l;
break;
case SELECT_MODE_WRITE:
Store_field(l, 1, write_list);
write_list = l;
break;
case SELECT_MODE_EXCEPT:
Store_field(l, 1, except_list);
except_list = l;
break;
}
}
/* We try to only process the first error, bypass other errors */
if (err == 0 && iterSelectData->EState == SELECT_STATE_ERROR)
{
err = iterSelectData->nError;
}
iterSelectData = LIST_NEXT(LPSELECTDATA, iterSelectData);
}
}
/* Free resources */
DEBUG_PRINT("Free selectdata resources");
iterSelectData = lpSelectData;
while (iterSelectData != NULL)
{
lpSelectData = iterSelectData;
iterSelectData = LIST_NEXT(LPSELECTDATA, iterSelectData);
select_data_free(lpSelectData);
}
lpSelectData = NULL;
/* Free allocated events/handle set array */
DEBUG_PRINT("Free local allocated resources");
caml_stat_free(lpEventsDone);
caml_stat_free(hdsData);
DEBUG_PRINT("Raise error if required");
if (err != 0)
{
win32_maperr(err);
uerror("select", Nothing);
}
}
}
DEBUG_PRINT("Build final result");
res = alloc_small(3, 0);
Store_field(res, 0, read_list);
Store_field(res, 1, write_list);
Store_field(res, 2, except_list);
DEBUG_PRINT("out select");
CAMLreturn(res);
}
