source: signal.c @ 96ade35

Last change on this file since 96ade35 was fafb842, checked in by David Benjamin <davidben@mit.edu>, 13 years ago
First go at sigwait-based signal handling SIGINT doesn't quite work.
  • Property mode set to 100644
File size: 1.6 KB
Line 
1#include <glib.h>
2#include <pthread.h>
3#include <signal.h>
4#include <stdio.h>
5#include <stdlib.h>
6
7static GThread *signal_thread;
8static sigset_t signal_set;
9
10static void (*signal_cb)(int, void*);
11static void *signal_cbdata;
12
13static gpointer signal_thread_func(gpointer data);
14static gboolean signal_thunk(gpointer data);
15
16void owl_signal_init(const sigset_t *set, void (*callback)(int, void*), void *data) {
17  GError *error = NULL;
18
19  signal_set = *set;
20  signal_cb = callback;
21  signal_cbdata = data;
22  /* Block these signals in all threads, so we can get them. */
23  pthread_sigmask(SIG_BLOCK, set, NULL);
24  /* Spawn a dedicated thread to sigwait. */
25  signal_thread = g_thread_create(signal_thread_func, g_main_context_default(),
26                                  FALSE, &error);
27  if (signal_thread == NULL) {
28    fprintf(stderr, "Failed to create signal thread: %s\n", error->message);
29    exit(1);
30  }
31}
32
33static gpointer signal_thread_func(gpointer data) {
34  GMainContext *context = data;
35
36  while (1) {
37    GSource *source;
38    int signal;
39    int ret;
40
41    ret = sigwait(&signal_set, &signal);
42    /* TODO: Print an error? man page claims it never errors. */
43    if (ret != 0)
44      continue;
45
46    /* Send a message to the other main. */
47    source = g_idle_source_new();
48    g_source_set_priority(source, G_PRIORITY_DEFAULT);
49    g_source_set_callback(source, signal_thunk, GINT_TO_POINTER(signal), NULL);
50    g_source_attach(source, context);
51    g_source_unref(source);
52  }
53  return NULL;
54}
55
56static gboolean signal_thunk(gpointer data) {
57  signal_cb(GPOINTER_TO_INT(data), signal_cbdata);
58  return FALSE;
59}
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