X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/5a557d1ea0c466ea01d8d934d3de8800a625b86a..a95f37bc57cd0318ee2ae5cc94ac447cce47a5cf:/src/unix/epolldispatcher.cpp

diff --git a/src/unix/epolldispatcher.cpp b/src/unix/epolldispatcher.cpp
index f509c7be25..d42c4fea3b 100644
--- a/src/unix/epolldispatcher.cpp
+++ b/src/unix/epolldispatcher.cpp
@@ -23,6 +23,7 @@
 
 #include "wx/unix/private/epolldispatcher.h"
 #include "wx/unix/private.h"
+#include "wx/stopwatch.h"
 
 #ifndef WX_PRECOMP
     #include "wx/log.h"
@@ -158,30 +159,63 @@ bool wxEpollDispatcher::UnregisterFD(int fd)
     return true;
 }
 
-bool wxEpollDispatcher::Dispatch(int timeout)
+int
+wxEpollDispatcher::DoPoll(epoll_event *events, int numEvents, int timeout) const
+{
+    // the code below relies on TIMEOUT_INFINITE being -1 so that we can pass
+    // timeout value directly to epoll_wait() which interprets -1 as meaning to
+    // wait forever and would need to be changed if the value of
+    // TIMEOUT_INFINITE ever changes
+    wxCOMPILE_TIME_ASSERT( TIMEOUT_INFINITE == -1, UpdateThisCode );
+
+    wxMilliClock_t timeEnd;
+    if ( timeout > 0 )
+        timeEnd = wxGetLocalTimeMillis();
+
+    int rc;
+    for ( ;; )
+    {
+        rc = epoll_wait(m_epollDescriptor, events, numEvents, timeout);
+        if ( rc != -1 || errno != EINTR )
+            break;
+
+        // we got interrupted, update the timeout and restart
+        if ( timeout > 0 )
+        {
+            timeout = wxMilliClockToLong(timeEnd - wxGetLocalTimeMillis());
+            if ( timeout < 0 )
+                return 0;
+        }
+    }
+
+    return rc;
+}
+
+bool wxEpollDispatcher::HasPending() const
+{
+    epoll_event event;
+
+    // NB: it's not really clear if epoll_wait() can return a number greater
+    //     than the number of events passed to it but just in case it can, use
+    //     >= instead of == here, see #10397
+    return DoPoll(&event, 1, 0) >= 1;
+}
+
+int wxEpollDispatcher::Dispatch(int timeout)
 {
     epoll_event events[16];
 
-    const int e_num = epoll_wait
-                      (
-                        m_epollDescriptor,
-                        events,
-                        WXSIZEOF(events),
-                        timeout == TIMEOUT_INFINITE ? -1 : timeout
-                      );
+    const int rc = DoPoll(events, WXSIZEOF(events), timeout);
 
-    if ( e_num == -1 )
+    if ( rc == -1 )
     {
-        if ( errno != EINTR )
-        {
-            wxLogSysError(_("Waiting for IO on epoll descriptor %d failed"),
-                          m_epollDescriptor);
-            return false;
-        }
+        wxLogSysError(_("Waiting for IO on epoll descriptor %d failed"),
+                      m_epollDescriptor);
+        return -1;
     }
 
-    bool gotEvents = false;
-    for ( epoll_event *p = events; p < events + e_num; p++ )
+    int numEvents = 0;
+    for ( epoll_event *p = events; p < events + rc; p++ )
     {
         wxFDIOHandler * const handler = (wxFDIOHandler *)(p->data.ptr);
         if ( !handler )
@@ -203,10 +237,10 @@ bool wxEpollDispatcher::Dispatch(int timeout)
         else
             continue;
 
-        gotEvents = true;
+        numEvents++;
     }
 
-    return gotEvents;
+    return numEvents;
 }
 
 #endif // wxUSE_EPOLL_DISPATCHER