JehanneOS/newlib
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Cygwin: signalfd: implement non-polling select

Browse Source 
Allow the signal thread to recognize we're called in consequence of
select on a signalfd.  If the signal is part of the wait mask, don't
call any signal handler and don't remove the signal from the queue,
so a subsequent read (or sigwaitinfo/sigtimedwait) still gets the
signal.  Instead, just signal the event object at
_cygtls::signalfd_select_wait for the thread running select.

The addition of signalfd_select_wait to _cygtls unearthed the alignment
problem of the context member again.  To make sure this doesn't get lost,
improve the related comment in the header file so that this (hopefully)
doesn't get lost (again).

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen
2019-01-14 17:19:37 +01:00
parent 752151e715
commit f42776fa78
9 changed files with 129 additions and 33 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
winsup/cygwin/select.h
View File

@@ -66,6 +66,12 @@ struct select_serial_info: public select_info
select_serial_info (): select_info () {}
};
struct select_signalfd_info: public select_info
{
HANDLE evt;
select_signalfd_info (): select_info () {}
};
class select_stuff
{
public:
@@ -85,6 +91,7 @@ public:
select_pipe_info *device_specific_pipe;
select_socket_info *device_specific_socket;
select_serial_info *device_specific_serial;
select_signalfd_info *device_specific_signalfd;
bool test_and_set (int, fd_set *, fd_set *, fd_set *);
int poll (fd_set *, fd_set *, fd_set *);
@@ -93,10 +100,11 @@ public:
void destroy ();
select_stuff (): return_on_signal (false), always_ready (false),
windows_used (false), start (0),
windows_used (false), start (),
device_specific_pipe (NULL),
device_specific_socket (NULL),
device_specific_serial (NULL) {}
device_specific_serial (NULL),
device_specific_signalfd (NULL) {}
};
extern "C" int cygwin_select (int , fd_set *, fd_set *, fd_set *,