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cross_process_sync.h
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1 /*
2  * Copyright © 2013 Canonical Ltd.
3  *
4  * This program is free software: you can redistribute it and/or modify it
5  * under the terms of the GNU General Public License version 3,
6  * as published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11  * GNU General Public License for more details.
12  *
13  * You should have received a copy of the GNU General Public License
14  * along with this program. If not, see <http://www.gnu.org/licenses/>.
15  *
16  * Authored by: Thomas Voss <thomas.voss@canonical.com>
17  */
18 
19 #ifndef MIR_TEST_FRAMEWORK_CROSS_PROCESS_SYNC_H_
20 #define MIR_TEST_FRAMEWORK_CROSS_PROCESS_SYNC_H_
21 
22 #include <chrono>
23 
24 namespace mir_test_framework
25 {
26 // A cross-process synchronization primitive that supports simple
27 // wait-condition-like scenarios.
29 {
30  public:
33  ~CrossProcessSync() noexcept;
34 
36 
37  // Try to signal the other side that we are ready for at most duration milliseconds.
38  // Throws a std::runtime_error if not successful.
39  void try_signal_ready_for(const std::chrono::milliseconds& duration);
40 
41  void try_signal_ready_for();
42 
43  // Wait for the other sides to signal readiness for at most duration milliseconds.
44  // Returns the number of ready signals that have been collected since creation.
45  // Throws std::runtime_error if not successful.
46  unsigned int wait_for_signal_ready_for(const std::chrono::milliseconds& duration);
47  unsigned int wait_for_signal_ready_for();
48 
49  void signal_ready();
50  unsigned int wait_for_signal_ready();
51 
52  private:
53  int fds[2];
54  unsigned int counter;
55 };
56 }
57 
58 #endif // MIR_TEST_FRAMEWORK_CROSS_PROCESS_SYNC_H_

Copyright © 2012,2013 Canonical Ltd.
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