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Fix race condition when waiting for a signal

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* cygtls.h (_cygtls::wait_signal_arrived): Renamed from
        set_signal_arrived.
        (_cygtls::set_signal_arrived): New function signalling signal_arrived.
        (_cygtls::reset_signal_arrived): Don't reset will_wait_for_signal.
        (_cygtls::unwait_signal_arrived): New function only resetting
        will_wait_for_signal.
        (class wait_signal_arrived): Rename from set_signal_arrived.
        Accommodate name change throughout Cygwin.
        (wait_signal_arrived::~wait_signal_arrived): Call
        _cygtls::unwait_signal_arrived.  Add comment.
        * cygserver_ipc.h (ipc_set_proc_info): Fetch signal_arrived handle
        via call to _cygtls::get_signal_arrived.
        * exceptions.cc (_cygtls::interrupt_setup): Signal signal_arrived via
        call to _cygtls::set_signal_arrived.
        (_cygtls::handle_SIGCONT): Ditto.
        * fhandler_socket.cc (fhandler_socket::wait_for_events): Generate
        WSAEVENT array prior to entering wait loop.  Add cancel event object
        if available.  Remove calls to pthread_testcancel and just call
        pthread::static_cancel_self if the cancel event object is signalled.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen
2015-11-27 14:39:11 +01:00
parent 9471b0b36d
commit c43e9340f1
12 changed files with 63 additions and 26 deletions
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2
winsup/cygwin/cygwait.cc
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@@ -40,7 +40,7 @@ cygwait (HANDLE object, PLARGE_INTEGER timeout, unsigned mask)
if (object)
wait_objects[num++] = object;
set_signal_arrived thread_waiting (is_cw_sig_handle, wait_objects[num]);
wait_signal_arrived thread_waiting (is_cw_sig_handle, wait_objects[num]);
debug_only_printf ("object %p, thread waiting %d, signal_arrived %p", object, (int) thread_waiting, _my_tls.signal_arrived);
DWORD sig_n;
if (!thread_waiting)