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[awesomized/libmemcached] / util / signal.hpp
1 /* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
2 *
3 * Data Differential Utility library
4 *
5 * Copyright (C) 2012 Data Differential, http://datadifferential.com/
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are
9 * met:
10 *
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * * Redistributions in binary form must reproduce the above
15 * copyright notice, this list of conditions and the following disclaimer
16 * in the documentation and/or other materials provided with the
17 * distribution.
18 *
19 * * The names of its contributors may not be used to endorse or
20 * promote products derived from this software without specific prior
21 * written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
27 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
29 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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35 */
36
37 #pragma once
38
39 #include <pthread.h>
40 #include <semaphore.h>
41
42 #ifdef HAVE_SIGNAL_H
43 #include <signal.h>
44 #endif
45
46 namespace datadifferential {
47 namespace util {
48
49 enum shutdown_t {
50 SHUTDOWN_RUNNING,
51 SHUTDOWN_GRACEFUL,
52 SHUTDOWN_FORCED
53 };
54
55 class SignalThread {
56 bool _exit_on_signal;
57 sigset_t set;
58 sem_t lock;
59 uint64_t magic_memory;
60 volatile shutdown_t __shutdown;
61 pthread_mutex_t shutdown_mutex;
62 pthread_t thread;
63
64 public:
65
66 SignalThread(bool exit_on_signal_arg= false);
67
68 void test();
69 void post();
70 bool setup();
71
72 bool exit_on_signal()
73 {
74 return _exit_on_signal;
75 }
76
77 int wait(int& sig)
78 {
79 return sigwait(&set, &sig);
80 }
81
82 ~SignalThread();
83
84 void set_shutdown(shutdown_t arg);
85 bool is_shutdown();
86 shutdown_t get_shutdown();
87 };
88
89 } /* namespace util */
90 } /* namespace datadifferential */