1/*
2 Copyright (c) 2005-2019 Intel Corporation
3
4 Licensed under the Apache License, Version 2.0 (the "License");
5 you may not use this file except in compliance with the License.
6 You may obtain a copy of the License at
7
8 http://www.apache.org/licenses/LICENSE-2.0
9
10 Unless required by applicable law or agreed to in writing, software
11 distributed under the License is distributed on an "AS IS" BASIS,
12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 See the License for the specific language governing permissions and
14 limitations under the License.
15*/
16
17#include "tbb/task.h"
18#include "harness.h"
19#include "tbb/task_scheduler_init.h"
20
21using tbb::task;
22
23#if __TBB_ipf
24 const unsigned StackSize = 1024*1024*6;
25#else /* */
26 const unsigned StackSize = 1024*1024*3;
27#endif
28
29// GCC and ICC on Linux store TLS data in the stack space. This test makes sure
30// that the stealing limiting heuristic used by the task scheduler does not
31// switch off stealing when a large amount of TLS data is reserved.
32#if _MSC_VER
33__declspec(thread)
34#elif __linux__ || ((__MINGW32__ || __MINGW64__) && __TBB_GCC_VERSION >= 40500)
35__thread
36#endif
37 char map2[1024*1024*2];
38
39class TestTask : public task {
40public:
41 static volatile int completed;
42 task* execute() __TBB_override {
43 completed = 1;
44 return NULL;
45 };
46};
47
48volatile int TestTask::completed = 0;
49
50void TestStealingIsEnabled () {
51 tbb::task_scheduler_init init(2, StackSize);
52 task &r = *new( task::allocate_root() ) tbb::empty_task;
53 task &t = *new( r.allocate_child() ) TestTask;
54 r.set_ref_count(2);
55 r.spawn(t);
56 int count = 0;
57 while ( !TestTask::completed && ++count < 6 )
58 Harness::Sleep(1000);
59 ASSERT( TestTask::completed, "Stealing is disabled or the machine is heavily oversubscribed" );
60 r.wait_for_all();
61 task::destroy(r);
62}
63
64int TestMain () {
65#if !__TBB_THREAD_LOCAL_VARIABLES_PRESENT
66 REPORT( "Known issue: Test skipped because no compiler support for __thread keyword.\n" );
67 return Harness::Skipped;
68#endif
69 if ( tbb::task_scheduler_init::default_num_threads() == 1 ) {
70 REPORT( "Known issue: Test requires at least 2 hardware threads.\n" );
71 return Harness::Skipped;
72 }
73 TestStealingIsEnabled();
74 return Harness::Done;
75}
76