Intel(R) Threading Building Blocks Doxygen Documentation  version 4.2.3
governor.h
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1 /*
2  Copyright (c) 2005-2020 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 #ifndef _TBB_governor_H
18 #define _TBB_governor_H
19 
21 #include "../rml/include/rml_tbb.h"
22 
23 #include "tbb_misc.h" // for AvailableHwConcurrency
24 #include "tls.h"
25 
26 #if __TBB_SURVIVE_THREAD_SWITCH
27 #include "cilk-tbb-interop.h"
28 #endif /* __TBB_SURVIVE_THREAD_SWITCH */
29 
30 namespace tbb {
31 namespace internal {
32 
33 class market;
34 class generic_scheduler;
35 class __TBB_InitOnce;
36 
37 namespace rml {
38 class tbb_client;
39 }
40 
41 //------------------------------------------------------------------------
42 // Class governor
43 //------------------------------------------------------------------------
44 
46 
48 class governor {
49 private:
50  friend class __TBB_InitOnce;
51  friend class market;
52 
55 
57  static unsigned DefaultNumberOfThreads;
58 
60  static size_t DefaultPageSize;
61 
62  static rml::tbb_factory theRMLServerFactory;
63 
64  static bool UsePrivateRML;
65 
66  // Flags for runtime-specific conditions
68  static bool is_rethrow_broken;
69 
71  static void acquire_resources ();
72 
74  static void release_resources ();
75 
76  static rml::tbb_server* create_rml_server ( rml::tbb_client& );
77 
79 
81  static void auto_terminate(void* scheduler);
82 
83 public:
84  static unsigned default_num_threads () {
85  // No memory fence required, because at worst each invoking thread calls AvailableHwConcurrency once.
86  return DefaultNumberOfThreads ? DefaultNumberOfThreads :
87  DefaultNumberOfThreads = AvailableHwConcurrency();
88  }
89  static size_t default_page_size () {
90  return DefaultPageSize ? DefaultPageSize :
91  DefaultPageSize = DefaultSystemPageSize();
92  }
93  static void one_time_init();
95 
97  static generic_scheduler* init_scheduler( int num_threads, stack_size_type stack_size, bool auto_init );
98 
100  static generic_scheduler* init_scheduler_weak();
101 
103  static bool terminate_scheduler( generic_scheduler* s, bool blocking );
104 
106  static void sign_on( generic_scheduler* s );
107 
109  static void sign_off( generic_scheduler* s );
110 
112  static bool is_set( generic_scheduler* s );
113 
115  static void assume_scheduler( generic_scheduler* s );
116 
118  static uintptr_t tls_value_of( generic_scheduler* s );
119 
120  // TODO IDEA: refactor bit manipulations over pointer types to a class?
122  static generic_scheduler* tls_scheduler_of( uintptr_t v ) {
123  return (generic_scheduler*)(v & ~uintptr_t(1));
124  }
125 
127 
130  uintptr_t v = theTLS.get();
131  return (v&1) ? tls_scheduler_of(v) : init_scheduler( task_scheduler_init::automatic, 0, /*auto_init=*/true );
132  }
133 
135  uintptr_t v = theTLS.get();
136  return v ? tls_scheduler_of(v) : init_scheduler_weak();
137  }
138 
140  return tls_scheduler_of( theTLS.get() );
141  }
142 
145  auto_terminate( local_scheduler_if_initialized() );
146  }
147 
148  static void print_version_info ();
149 
150  static void initialize_rml_factory ();
151 
152  static bool does_client_join_workers (const tbb::internal::rml::tbb_client &client);
153 
154 #if __TBB_SURVIVE_THREAD_SWITCH
155  static __cilk_tbb_retcode stack_op_handler( __cilk_tbb_stack_op op, void* );
156 #endif /* __TBB_SURVIVE_THREAD_SWITCH */
157 
158  static bool speculation_enabled() { return is_speculation_enabled; }
159  static bool rethrow_exception_broken() { return is_rethrow_broken; }
160 
161 }; // class governor
162 
163 } // namespace internal
164 } // namespace tbb
165 
166 #endif /* _TBB_governor_H */
static void terminate_auto_initialized_scheduler()
Undo automatic initialization if necessary; call when a thread exits.
Definition: governor.h:144
__cilk_tbb_stack_op
static generic_scheduler * tls_scheduler_of(uintptr_t v)
Converts TLS value to the scheduler pointer.
Definition: governor.h:122
static size_t DefaultPageSize
Caches the size of OS regular memory page.
Definition: governor.h:60
int AvailableHwConcurrency()
Returns maximal parallelism level supported by the current OS configuration.
static bool speculation_enabled()
Definition: governor.h:158
The class handles access to the single instance of market, and to TLS to keep scheduler instances...
Definition: governor.h:48
size_t DefaultSystemPageSize()
Returns OS regular memory page size.
Definition: tbb_misc.cpp:70
static unsigned DefaultNumberOfThreads
Caches the maximal level of parallelism supported by the hardware.
Definition: governor.h:57
int __cilk_tbb_retcode
std::size_t stack_size_type
static generic_scheduler * local_scheduler_if_initialized()
Definition: governor.h:139
static generic_scheduler * local_scheduler()
Obtain the thread-local instance of the TBB scheduler.
Definition: governor.h:129
static bool is_rethrow_broken
Definition: governor.h:68
static basic_tls< uintptr_t > theTLS
TLS for scheduler instances associated with individual threads.
Definition: governor.h:54
static unsigned default_num_threads()
Definition: governor.h:84
Class that supports TBB initialization.
Definition: tbb_main.h:37
static generic_scheduler * local_scheduler_weak()
Definition: governor.h:134
static rml::tbb_factory theRMLServerFactory
Definition: governor.h:62
static bool rethrow_exception_broken()
Definition: governor.h:159
static bool UsePrivateRML
Definition: governor.h:64
void const char const char int ITT_FORMAT __itt_group_sync s
static bool is_speculation_enabled
Definition: governor.h:67
static const int automatic
Typedef for number of threads that is automatic.
Work stealing task scheduler.
Definition: scheduler.h:137
The graph class.
static size_t default_page_size()
Definition: governor.h:89

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