Commit | Line | Data |
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872870b2 | 1 | /* Function for handling the GLib event loop. |
95df8112 | 2 | |
ab422c4d | 3 | Copyright (C) 2009-2013 Free Software Foundation, Inc. |
872870b2 JD |
4 | |
5 | This file is part of GNU Emacs. | |
6 | ||
7 | GNU Emacs is free software: you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation, either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | GNU Emacs is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
a2332e8d | 18 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
872870b2 | 19 | |
08a494a3 | 20 | #include <config.h> |
872870b2 | 21 | |
aefd87e1 PE |
22 | #include "xgselect.h" |
23 | ||
55a87246 | 24 | #ifdef HAVE_GLIB |
aefd87e1 | 25 | |
872870b2 JD |
26 | #include <glib.h> |
27 | #include <errno.h> | |
7452b7bd | 28 | #include "frame.h" |
872870b2 | 29 | |
872870b2 | 30 | int |
ff23cd9f | 31 | xg_select (int fds_lim, SELECT_TYPE *rfds, SELECT_TYPE *wfds, SELECT_TYPE *efds, |
d35af63c | 32 | EMACS_TIME *timeout, sigset_t *sigmask) |
872870b2 JD |
33 | { |
34 | SELECT_TYPE all_rfds, all_wfds; | |
35 | EMACS_TIME tmo, *tmop = timeout; | |
36 | ||
b0572523 | 37 | GMainContext *context; |
872870b2 | 38 | int have_wfds = wfds != NULL; |
0f46bc75 PE |
39 | GPollFD gfds_buf[128]; |
40 | GPollFD *gfds = gfds_buf; | |
41 | int gfds_size = sizeof gfds_buf / sizeof *gfds_buf; | |
42 | int n_gfds, retval = 0, our_fds = 0, max_fds = fds_lim - 1; | |
ff23cd9f | 43 | int i, nfds, tmo_in_millisec; |
0f46bc75 | 44 | USE_SAFE_ALLOCA; |
872870b2 | 45 | |
5de0e011 JD |
46 | /* Do not try to optimize with an initial check with g_main_context_pending |
47 | and a call to pselect if it returns false. If Gdk has a timeout for 0.01 | |
48 | second, and Emacs has a timeout for 1 second, g_main_context_pending will | |
49 | return false, but the timeout will be 1 second, thus missing the gdk | |
50 | timeout with a lot. */ | |
51 | ||
52 | context = g_main_context_default (); | |
b0572523 | 53 | |
ae1d87e2 | 54 | if (rfds) all_rfds = *rfds; |
872870b2 | 55 | else FD_ZERO (&all_rfds); |
ae1d87e2 | 56 | if (wfds) all_wfds = *wfds; |
872870b2 JD |
57 | else FD_ZERO (&all_wfds); |
58 | ||
0f46bc75 PE |
59 | n_gfds = g_main_context_query (context, G_PRIORITY_LOW, &tmo_in_millisec, |
60 | gfds, gfds_size); | |
61 | if (gfds_size < n_gfds) | |
62 | { | |
63 | SAFE_NALLOCA (gfds, sizeof *gfds, n_gfds); | |
64 | gfds_size = n_gfds; | |
65 | n_gfds = g_main_context_query (context, G_PRIORITY_LOW, &tmo_in_millisec, | |
66 | gfds, gfds_size); | |
67 | } | |
872870b2 | 68 | |
41729b81 | 69 | for (i = 0; i < n_gfds; ++i) |
872870b2 JD |
70 | { |
71 | if (gfds[i].events & G_IO_IN) | |
72 | { | |
73 | FD_SET (gfds[i].fd, &all_rfds); | |
74 | if (gfds[i].fd > max_fds) max_fds = gfds[i].fd; | |
75 | } | |
76 | if (gfds[i].events & G_IO_OUT) | |
77 | { | |
78 | FD_SET (gfds[i].fd, &all_wfds); | |
79 | if (gfds[i].fd > max_fds) max_fds = gfds[i].fd; | |
80 | have_wfds = 1; | |
81 | } | |
82 | } | |
83 | ||
0f46bc75 PE |
84 | SAFE_FREE (); |
85 | ||
872870b2 JD |
86 | if (tmo_in_millisec >= 0) |
87 | { | |
e9a9ae03 PE |
88 | tmo = make_emacs_time (tmo_in_millisec / 1000, |
89 | 1000 * 1000 * (tmo_in_millisec % 1000)); | |
d35af63c PE |
90 | if (!timeout || EMACS_TIME_LT (tmo, *timeout)) |
91 | tmop = &tmo; | |
872870b2 JD |
92 | } |
93 | ||
97107e2e | 94 | fds_lim = max_fds + 1; |
d35af63c PE |
95 | nfds = pselect (fds_lim, &all_rfds, have_wfds ? &all_wfds : NULL, |
96 | efds, tmop, sigmask); | |
872870b2 JD |
97 | |
98 | if (nfds < 0) | |
99 | retval = nfds; | |
41729b81 | 100 | else if (nfds > 0) |
872870b2 | 101 | { |
97107e2e | 102 | for (i = 0; i < fds_lim; ++i) |
872870b2 JD |
103 | { |
104 | if (FD_ISSET (i, &all_rfds)) | |
105 | { | |
106 | if (rfds && FD_ISSET (i, rfds)) ++retval; | |
107 | else ++our_fds; | |
108 | } | |
42d3022b J |
109 | else if (rfds) |
110 | FD_CLR (i, rfds); | |
111 | ||
872870b2 JD |
112 | if (have_wfds && FD_ISSET (i, &all_wfds)) |
113 | { | |
114 | if (wfds && FD_ISSET (i, wfds)) ++retval; | |
115 | else ++our_fds; | |
116 | } | |
42d3022b J |
117 | else if (wfds) |
118 | FD_CLR (i, wfds); | |
119 | ||
872870b2 JD |
120 | if (efds && FD_ISSET (i, efds)) |
121 | ++retval; | |
122 | } | |
123 | } | |
124 | ||
d35af63c | 125 | if (our_fds > 0 || (nfds == 0 && tmop == &tmo)) |
872870b2 | 126 | { |
41729b81 | 127 | |
872870b2 JD |
128 | /* If Gtk+ is in use eventually gtk_main_iteration will be called, |
129 | unless retval is zero. */ | |
130 | #ifdef USE_GTK | |
131 | if (retval == 0) | |
132 | #endif | |
133 | while (g_main_context_pending (context)) | |
134 | g_main_context_dispatch (context); | |
135 | ||
136 | /* To not have to recalculate timeout, return like this. */ | |
41729b81 | 137 | if (retval == 0) |
872870b2 JD |
138 | { |
139 | retval = -1; | |
140 | errno = EINTR; | |
141 | } | |
142 | } | |
143 | ||
144 | return retval; | |
145 | } | |
55a87246 | 146 | #endif /* HAVE_GLIB */ |