1 //
2 // Copyright 2016 Pixar
3 //
4 // Licensed under the Apache License, Version 2.0 (the "Apache License")
5 // with the following modification; you may not use this file except in
6 // compliance with the Apache License and the following modification to it:
7 // Section 6. Trademarks. is deleted and replaced with:
8 //
9 // 6. Trademarks. This License does not grant permission to use the trade
10 // names, trademarks, service marks, or product names of the Licensor
11 // and its affiliates, except as required to comply with Section 4(c) of
12 // the License and to reproduce the content of the NOTICE file.
13 //
14 // You may obtain a copy of the Apache License at
15 //
16 // http://www.apache.org/licenses/LICENSE-2.0
17 //
18 // Unless required by applicable law or agreed to in writing, software
19 // distributed under the Apache License with the above modification is
20 // distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
21 // KIND, either express or implied. See the Apache License for the specific
22 // language governing permissions and limitations under the Apache License.
23 //
24
25 #include "pxr/pxr.h"
26 #include "pxr/base/tf/errorMark.h"
27 #include "pxr/base/arch/stackTrace.h"
28
29 #include <unistd.h>
30
31 #include <thread>
32 #include <atomic>
33 #include <iostream>
34
35 PXR_NAMESPACE_USING_DIRECTIVE
36
37 // This could probably be a regular int since we're not really worried
38 // about full thread safety, just whether it is 1 or 0.
39 static std::atomic_int synchronizer;
40
41 /**
42 * This executable performs multiple "simultaneous" invalid memory
43 * references (SIGSEGV) for testing of the Tf crash handler from
44 * multiple threads.
45 */
46
47 static void
_ThreadTask()48 _ThreadTask()
49 {
50 TfErrorMark m;
51 TF_RUNTIME_ERROR("Pending secondary thread error for crash report!");
52
53 // Wait for synchronizer to become 0
54 while (synchronizer) {
55 // spin!
56 }
57
58 // Dereference a null pointer!
59 int* bunk(0);
60 std::cout << *bunk << '\n';
61 }
62
63 int
main(int argc,char ** argv)64 main(int argc, char **argv)
65 {
66 ArchSetFatalStackLogging( true );
67
68 TfErrorMark m;
69
70 TF_RUNTIME_ERROR("Pending error to report in crash output!");
71
72 // Make sure the threads don't run off and generate segmentation faults
73 // before we're ready.
74 //
75 synchronizer = 1;
76
77 // Spawn 2 threads, each of which will wait for synchronizer to
78 // become 0 and then generate a SIGSEGV. The desire is to produce
79 // two SIGSEGV signals in two different threads at very nearly the
80 // same time.
81 //
82 std::thread t1(_ThreadTask);
83 std::thread t2(_ThreadTask);
84
85 // Wait to ensure the threads are spinning on synchronizer
86 sleep(1);
87
88 // Release them.
89 synchronizer = 0;
90
91 // Wait for them to die
92 t1.join();
93 t2.join();
94
95 return 0;
96 }
97
98
99