LLVM OpenMP* Runtime Library
kmp_global.cpp
1 /*
2  * kmp_global.cpp -- KPTS global variables for runtime support library
3  */
4 
5 //===----------------------------------------------------------------------===//
6 //
7 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
8 // See https://llvm.org/LICENSE.txt for license information.
9 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "kmp.h"
14 #include "kmp_affinity.h"
15 #if KMP_USE_HIER_SCHED
16 #include "kmp_dispatch_hier.h"
17 #endif
18 
19 kmp_key_t __kmp_gtid_threadprivate_key;
20 
21 #if KMP_ARCH_X86 || KMP_ARCH_X86_64
22 kmp_cpuinfo_t __kmp_cpuinfo = {0}; // Not initialized
23 #endif
24 
25 #if KMP_STATS_ENABLED
26 #include "kmp_stats.h"
27 // lock for modifying the global __kmp_stats_list
28 kmp_tas_lock_t __kmp_stats_lock;
29 
30 // global list of per thread stats, the head is a sentinel node which
31 // accumulates all stats produced before __kmp_create_worker is called.
32 kmp_stats_list *__kmp_stats_list;
33 
34 // thread local pointer to stats node within list
35 KMP_THREAD_LOCAL kmp_stats_list *__kmp_stats_thread_ptr = NULL;
36 
37 // gives reference tick for all events (considered the 0 tick)
38 tsc_tick_count __kmp_stats_start_time;
39 #endif
40 
41 /* ----------------------------------------------------- */
42 /* INITIALIZATION VARIABLES */
43 /* they are syncronized to write during init, but read anytime */
44 volatile int __kmp_init_serial = FALSE;
45 volatile int __kmp_init_gtid = FALSE;
46 volatile int __kmp_init_common = FALSE;
47 volatile int __kmp_need_register_serial = TRUE;
48 volatile int __kmp_init_middle = FALSE;
49 volatile int __kmp_init_parallel = FALSE;
50 volatile int __kmp_init_hidden_helper = FALSE;
51 volatile int __kmp_init_hidden_helper_threads = FALSE;
52 volatile int __kmp_hidden_helper_team_done = FALSE;
53 #if KMP_USE_MONITOR
54 volatile int __kmp_init_monitor =
55  0; /* 1 - launched, 2 - actually started (Windows* OS only) */
56 #endif
57 volatile int __kmp_init_user_locks = FALSE;
58 
59 /* list of address of allocated caches for commons */
60 kmp_cached_addr_t *__kmp_threadpriv_cache_list = NULL;
61 
62 int __kmp_init_counter = 0;
63 int __kmp_root_counter = 0;
64 int __kmp_version = 0;
65 
66 std::atomic<kmp_int32> __kmp_team_counter = 0;
67 std::atomic<kmp_int32> __kmp_task_counter = 0;
68 
69 size_t __kmp_stksize = KMP_DEFAULT_STKSIZE;
70 #if KMP_USE_MONITOR
71 size_t __kmp_monitor_stksize = 0; // auto adjust
72 #endif
73 size_t __kmp_stkoffset = KMP_DEFAULT_STKOFFSET;
74 int __kmp_stkpadding = KMP_MIN_STKPADDING;
75 
76 size_t __kmp_malloc_pool_incr = KMP_DEFAULT_MALLOC_POOL_INCR;
77 
78 // Barrier method defaults, settings, and strings.
79 // branch factor = 2^branch_bits (only relevant for tree & hyper barrier types)
80 kmp_uint32 __kmp_barrier_gather_bb_dflt = 2;
81 /* branch_factor = 4 */ /* hyper2: C78980 */
82 kmp_uint32 __kmp_barrier_release_bb_dflt = 2;
83 /* branch_factor = 4 */ /* hyper2: C78980 */
84 
85 kmp_bar_pat_e __kmp_barrier_gather_pat_dflt = bp_hyper_bar;
86 /* hyper2: C78980 */
87 kmp_bar_pat_e __kmp_barrier_release_pat_dflt = bp_hyper_bar;
88 /* hyper2: C78980 */
89 
90 kmp_uint32 __kmp_barrier_gather_branch_bits[bs_last_barrier] = {0};
91 kmp_uint32 __kmp_barrier_release_branch_bits[bs_last_barrier] = {0};
92 kmp_bar_pat_e __kmp_barrier_gather_pattern[bs_last_barrier] = {bp_linear_bar};
93 kmp_bar_pat_e __kmp_barrier_release_pattern[bs_last_barrier] = {bp_linear_bar};
94 char const *__kmp_barrier_branch_bit_env_name[bs_last_barrier] = {
95  "KMP_PLAIN_BARRIER", "KMP_FORKJOIN_BARRIER"
96 #if KMP_FAST_REDUCTION_BARRIER
97  ,
98  "KMP_REDUCTION_BARRIER"
99 #endif // KMP_FAST_REDUCTION_BARRIER
100 };
101 char const *__kmp_barrier_pattern_env_name[bs_last_barrier] = {
102  "KMP_PLAIN_BARRIER_PATTERN", "KMP_FORKJOIN_BARRIER_PATTERN"
103 #if KMP_FAST_REDUCTION_BARRIER
104  ,
105  "KMP_REDUCTION_BARRIER_PATTERN"
106 #endif // KMP_FAST_REDUCTION_BARRIER
107 };
108 char const *__kmp_barrier_type_name[bs_last_barrier] = {"plain", "forkjoin"
109 #if KMP_FAST_REDUCTION_BARRIER
110  ,
111  "reduction"
112 #endif // KMP_FAST_REDUCTION_BARRIER
113 };
114 char const *__kmp_barrier_pattern_name[bp_last_bar] = {
115  "linear", "tree", "hyper", "hierarchical", "dist"};
116 
117 int __kmp_allThreadsSpecified = 0;
118 size_t __kmp_align_alloc = CACHE_LINE;
119 
120 int __kmp_generate_warnings = kmp_warnings_low;
121 int __kmp_reserve_warn = 0;
122 int __kmp_xproc = 0;
123 int __kmp_avail_proc = 0;
124 size_t __kmp_sys_min_stksize = KMP_MIN_STKSIZE;
125 int __kmp_sys_max_nth = KMP_MAX_NTH;
126 int __kmp_max_nth = 0;
127 int __kmp_cg_max_nth = 0;
128 int __kmp_task_max_nth = 0;
129 int __kmp_teams_max_nth = 0;
130 int __kmp_threads_capacity = 0;
131 int __kmp_dflt_team_nth = 0;
132 int __kmp_dflt_team_nth_ub = 0;
133 int __kmp_tp_capacity = 0;
134 int __kmp_tp_cached = 0;
135 int __kmp_dispatch_num_buffers = KMP_DFLT_DISP_NUM_BUFF;
136 int __kmp_dflt_max_active_levels = 1; // Nesting off by default
137 bool __kmp_dflt_max_active_levels_set = false; // Don't override set value
138 int __kmp_hot_teams_mode = 0; /* 0 - free extra threads when reduced */
139 /* 1 - keep extra threads when reduced */
140 int __kmp_hot_teams_max_level = 1; /* nesting level of hot teams */
141 enum library_type __kmp_library = library_none;
142 enum sched_type __kmp_sched =
143  kmp_sch_default; /* scheduling method for runtime scheduling */
144 enum sched_type __kmp_static =
145  kmp_sch_static_greedy; /* default static scheduling method */
146 enum sched_type __kmp_guided =
147  kmp_sch_guided_iterative_chunked; /* default guided scheduling method */
148 enum sched_type __kmp_auto =
149  kmp_sch_guided_analytical_chunked; /* default auto scheduling method */
150 #if KMP_USE_HIER_SCHED
151 int __kmp_dispatch_hand_threading = 0;
152 int __kmp_hier_max_units[kmp_hier_layer_e::LAYER_LAST + 1];
153 int __kmp_hier_threads_per[kmp_hier_layer_e::LAYER_LAST + 1];
154 kmp_hier_sched_env_t __kmp_hier_scheds = {0, 0, NULL, NULL, NULL};
155 #endif
156 int __kmp_dflt_blocktime = KMP_DEFAULT_BLOCKTIME; // in microseconds
157 char __kmp_blocktime_units = 'm'; // Units specified in KMP_BLOCKTIME
158 bool __kmp_wpolicy_passive = false;
159 #if KMP_USE_MONITOR
160 int __kmp_monitor_wakeups = KMP_MIN_MONITOR_WAKEUPS;
161 int __kmp_bt_intervals = KMP_INTERVALS_FROM_BLOCKTIME(KMP_DEFAULT_BLOCKTIME,
162  KMP_MIN_MONITOR_WAKEUPS);
163 #endif
164 #ifdef KMP_ADJUST_BLOCKTIME
165 int __kmp_zero_bt = FALSE;
166 #endif /* KMP_ADJUST_BLOCKTIME */
167 #ifdef KMP_DFLT_NTH_CORES
168 int __kmp_ncores = 0;
169 #endif
170 int __kmp_chunk = 0;
171 int __kmp_force_monotonic = 0;
172 int __kmp_abort_delay = 0;
173 #if (KMP_OS_LINUX || KMP_OS_AIX || KMP_OS_SOLARIS) && defined(KMP_TDATA_GTID)
174 int __kmp_gtid_mode = 3; /* use __declspec(thread) TLS to store gtid */
175 int __kmp_adjust_gtid_mode = FALSE;
176 #elif KMP_OS_WINDOWS
177 int __kmp_gtid_mode = 2; /* use TLS functions to store gtid */
178 int __kmp_adjust_gtid_mode = FALSE;
179 #else
180 int __kmp_gtid_mode = 0; /* select method to get gtid based on #threads */
181 int __kmp_adjust_gtid_mode = TRUE;
182 #endif /* KMP_OS_LINUX && defined(KMP_TDATA_GTID) */
183 #ifdef KMP_TDATA_GTID
184 KMP_THREAD_LOCAL int __kmp_gtid = KMP_GTID_DNE;
185 #endif /* KMP_TDATA_GTID */
186 int __kmp_tls_gtid_min = INT_MAX;
187 int __kmp_foreign_tp = TRUE;
188 #if KMP_ARCH_X86 || KMP_ARCH_X86_64
189 int __kmp_inherit_fp_control = TRUE;
190 kmp_int16 __kmp_init_x87_fpu_control_word = 0;
191 kmp_uint32 __kmp_init_mxcsr = 0;
192 #endif /* KMP_ARCH_X86 || KMP_ARCH_X86_64 */
193 
194 #ifdef USE_LOAD_BALANCE
195 double __kmp_load_balance_interval = 1.0;
196 #endif /* USE_LOAD_BALANCE */
197 
198 kmp_nested_nthreads_t __kmp_nested_nth = {NULL, 0, 0};
199 
200 #if KMP_USE_ADAPTIVE_LOCKS
201 
202 kmp_adaptive_backoff_params_t __kmp_adaptive_backoff_params = {
203  1, 1024}; // TODO: tune it!
204 
205 #if KMP_DEBUG_ADAPTIVE_LOCKS
206 const char *__kmp_speculative_statsfile = "-";
207 #endif
208 
209 #endif // KMP_USE_ADAPTIVE_LOCKS
210 
211 int __kmp_display_env = FALSE;
212 int __kmp_display_env_verbose = FALSE;
213 int __kmp_omp_cancellation = FALSE;
214 int __kmp_nteams = 0;
215 int __kmp_teams_thread_limit = 0;
216 
217 #if KMP_HAVE_MWAIT || KMP_HAVE_UMWAIT
218 int __kmp_user_level_mwait = FALSE;
219 int __kmp_umwait_enabled = FALSE;
220 int __kmp_mwait_enabled = FALSE;
221 int __kmp_mwait_hints = 0;
222 #endif
223 
224 #if KMP_HAVE_UMWAIT
225 int __kmp_waitpkg_enabled = 0;
226 int __kmp_tpause_state = 0;
227 int __kmp_tpause_hint = 1;
228 int __kmp_tpause_enabled = 0;
229 #endif
230 
231 /* map OMP 3.0 schedule types with our internal schedule types */
232 enum sched_type __kmp_sch_map[kmp_sched_upper - kmp_sched_lower_ext +
233  kmp_sched_upper_std - kmp_sched_lower - 2] = {
234  kmp_sch_static_chunked, // ==> kmp_sched_static = 1
235  kmp_sch_dynamic_chunked, // ==> kmp_sched_dynamic = 2
236  kmp_sch_guided_chunked, // ==> kmp_sched_guided = 3
237  kmp_sch_auto, // ==> kmp_sched_auto = 4
238  kmp_sch_trapezoidal // ==> kmp_sched_trapezoidal = 101
239  // will likely not be used, introduced here just to debug the code
240  // of public intel extension schedules
241 };
242 
243 #if KMP_MIC_SUPPORTED
244 enum mic_type __kmp_mic_type = non_mic;
245 #endif
246 
247 #if KMP_AFFINITY_SUPPORTED
248 
249 KMPAffinity *__kmp_affinity_dispatch = NULL;
250 
251 #if KMP_USE_HWLOC
252 int __kmp_hwloc_error = FALSE;
253 hwloc_topology_t __kmp_hwloc_topology = NULL;
254 #endif
255 
256 #if KMP_OS_WINDOWS
257 #if KMP_GROUP_AFFINITY
258 int __kmp_num_proc_groups = 1;
259 #endif /* KMP_GROUP_AFFINITY */
260 kmp_GetActiveProcessorCount_t __kmp_GetActiveProcessorCount = NULL;
261 kmp_GetActiveProcessorGroupCount_t __kmp_GetActiveProcessorGroupCount = NULL;
262 kmp_GetThreadGroupAffinity_t __kmp_GetThreadGroupAffinity = NULL;
263 kmp_SetThreadGroupAffinity_t __kmp_SetThreadGroupAffinity = NULL;
264 #endif /* KMP_OS_WINDOWS */
265 
266 size_t __kmp_affin_mask_size = 0;
267 enum affinity_top_method __kmp_affinity_top_method =
268  affinity_top_method_default;
269 
270 // Regular thread affinity settings from KMP_AFFINITY
271 kmp_affinity_t __kmp_affinity = KMP_AFFINITY_INIT("KMP_AFFINITY");
272 // Hidden helper thread affinity settings from KMP_HIDDEN_HELPER_AFFINITY
273 kmp_affinity_t __kmp_hh_affinity =
274  KMP_AFFINITY_INIT("KMP_HIDDEN_HELPER_AFFINITY");
275 kmp_affinity_t *__kmp_affinities[] = {&__kmp_affinity, &__kmp_hh_affinity};
276 
277 char *__kmp_cpuinfo_file = NULL;
278 #if KMP_WEIGHTED_ITERATIONS_SUPPORTED
279 int __kmp_first_osid_with_ecore = -1;
280 #endif
281 
282 #endif /* KMP_AFFINITY_SUPPORTED */
283 
284 kmp_nested_proc_bind_t __kmp_nested_proc_bind = {NULL, 0, 0};
285 kmp_proc_bind_t __kmp_teams_proc_bind = proc_bind_spread;
286 int __kmp_affinity_num_places = 0;
287 int __kmp_display_affinity = FALSE;
288 char *__kmp_affinity_format = NULL;
289 
290 kmp_int32 __kmp_default_device = 0;
291 
292 kmp_tasking_mode_t __kmp_tasking_mode = tskm_task_teams;
293 kmp_int32 __kmp_max_task_priority = 0;
294 kmp_uint64 __kmp_taskloop_min_tasks = 0;
295 
296 int __kmp_memkind_available = 0;
297 bool __kmp_hwloc_available = false;
298 omp_allocator_handle_t const omp_null_allocator = NULL;
299 omp_allocator_handle_t const omp_default_mem_alloc =
300  (omp_allocator_handle_t const)1;
301 omp_allocator_handle_t const omp_large_cap_mem_alloc =
302  (omp_allocator_handle_t const)2;
303 omp_allocator_handle_t const omp_const_mem_alloc =
304  (omp_allocator_handle_t const)3;
305 omp_allocator_handle_t const omp_high_bw_mem_alloc =
306  (omp_allocator_handle_t const)4;
307 omp_allocator_handle_t const omp_low_lat_mem_alloc =
308  (omp_allocator_handle_t const)5;
309 omp_allocator_handle_t const omp_cgroup_mem_alloc =
310  (omp_allocator_handle_t const)6;
311 omp_allocator_handle_t const omp_pteam_mem_alloc =
312  (omp_allocator_handle_t const)7;
313 omp_allocator_handle_t const omp_thread_mem_alloc =
314  (omp_allocator_handle_t const)8;
315 omp_allocator_handle_t const llvm_omp_target_host_mem_alloc =
316  (omp_allocator_handle_t const)100;
317 omp_allocator_handle_t const llvm_omp_target_shared_mem_alloc =
318  (omp_allocator_handle_t const)101;
319 omp_allocator_handle_t const llvm_omp_target_device_mem_alloc =
320  (omp_allocator_handle_t const)102;
321 omp_allocator_handle_t const kmp_max_mem_alloc =
322  (omp_allocator_handle_t const)1024;
323 omp_allocator_handle_t __kmp_def_allocator = omp_default_mem_alloc;
324 
325 omp_memspace_handle_t const omp_null_mem_space = (omp_memspace_handle_t const)0;
326 omp_memspace_handle_t const omp_default_mem_space =
327  (omp_memspace_handle_t const)99;
328 omp_memspace_handle_t const omp_large_cap_mem_space =
329  (omp_memspace_handle_t const)1;
330 omp_memspace_handle_t const omp_const_mem_space =
331  (omp_memspace_handle_t const)2;
332 omp_memspace_handle_t const omp_high_bw_mem_space =
333  (omp_memspace_handle_t const)3;
334 omp_memspace_handle_t const omp_low_lat_mem_space =
335  (omp_memspace_handle_t const)4;
336 omp_memspace_handle_t const llvm_omp_target_host_mem_space =
337  (omp_memspace_handle_t const)100;
338 omp_memspace_handle_t const llvm_omp_target_shared_mem_space =
339  (omp_memspace_handle_t const)101;
340 omp_memspace_handle_t const llvm_omp_target_device_mem_space =
341  (omp_memspace_handle_t const)102;
342 omp_memspace_handle_t const kmp_max_mem_space =
343  (omp_memspace_handle_t const)1024;
344 
345 /* This check ensures that the compiler is passing the correct data type for the
346  flags formal parameter of the function kmpc_omp_task_alloc(). If the type is
347  not a 4-byte type, then give an error message about a non-positive length
348  array pointing here. If that happens, the kmp_tasking_flags_t structure must
349  be redefined to have exactly 32 bits. */
350 KMP_BUILD_ASSERT(sizeof(kmp_tasking_flags_t) == 4);
351 
352 int __kmp_task_stealing_constraint = 1; /* Constrain task stealing by default */
353 int __kmp_enable_task_throttling = 1;
354 
355 #ifdef DEBUG_SUSPEND
356 int __kmp_suspend_count = 0;
357 #endif
358 
359 int __kmp_settings = FALSE;
360 int __kmp_duplicate_library_ok = 0;
361 #if USE_ITT_BUILD
362 int __kmp_forkjoin_frames = 1;
363 int __kmp_forkjoin_frames_mode = 3;
364 #endif
365 PACKED_REDUCTION_METHOD_T __kmp_force_reduction_method =
366  reduction_method_not_defined;
367 int __kmp_determ_red = FALSE;
368 
369 #ifdef KMP_DEBUG
370 int kmp_a_debug = 0;
371 int kmp_b_debug = 0;
372 int kmp_c_debug = 0;
373 int kmp_d_debug = 0;
374 int kmp_e_debug = 0;
375 int kmp_f_debug = 0;
376 int kmp_diag = 0;
377 #endif
378 
379 /* For debug information logging using rotating buffer */
380 int __kmp_debug_buf =
381  FALSE; /* TRUE means use buffer, FALSE means print to stderr */
382 int __kmp_debug_buf_lines =
383  KMP_DEBUG_BUF_LINES_INIT; /* Lines of debug stored in buffer */
384 int __kmp_debug_buf_chars =
385  KMP_DEBUG_BUF_CHARS_INIT; /* Characters allowed per line in buffer */
386 int __kmp_debug_buf_atomic =
387  FALSE; /* TRUE means use atomic update of buffer entry pointer */
388 
389 char *__kmp_debug_buffer = NULL; /* Debug buffer itself */
390 std::atomic<int> __kmp_debug_count =
391  0; /* number of lines printed in buffer so far */
392 int __kmp_debug_buf_warn_chars =
393  0; /* Keep track of char increase recommended in warnings */
394 /* end rotating debug buffer */
395 
396 #ifdef KMP_DEBUG
397 int __kmp_par_range; /* +1 => only go par for constructs in range */
398 /* -1 => only go par for constructs outside range */
399 char __kmp_par_range_routine[KMP_PAR_RANGE_ROUTINE_LEN] = {'\0'};
400 char __kmp_par_range_filename[KMP_PAR_RANGE_FILENAME_LEN] = {'\0'};
401 int __kmp_par_range_lb = 0;
402 int __kmp_par_range_ub = INT_MAX;
403 #endif /* KMP_DEBUG */
404 
405 /* For printing out dynamic storage map for threads and teams */
406 int __kmp_storage_map =
407  FALSE; /* True means print storage map for threads and teams */
408 int __kmp_storage_map_verbose =
409  FALSE; /* True means storage map includes placement info */
410 int __kmp_storage_map_verbose_specified = FALSE;
411 /* Initialize the library data structures when we fork a child process, defaults
412  * to TRUE */
413 int __kmp_need_register_atfork =
414  TRUE; /* At initialization, call pthread_atfork to install fork handler */
415 int __kmp_need_register_atfork_specified = TRUE;
416 
417 int __kmp_env_stksize = FALSE; /* KMP_STACKSIZE specified? */
418 int __kmp_env_blocktime = FALSE; /* KMP_BLOCKTIME specified? */
419 int __kmp_env_checks = FALSE; /* KMP_CHECKS specified? */
420 int __kmp_env_consistency_check = FALSE; /* KMP_CONSISTENCY_CHECK specified? */
421 
422 // From KMP_USE_YIELD:
423 // 0 = never yield;
424 // 1 = always yield (default);
425 // 2 = yield only if oversubscribed
426 #if KMP_OS_DARWIN && KMP_ARCH_AARCH64
427 // Set to 0 for environments where yield is slower
428 kmp_int32 __kmp_use_yield = 0;
429 #else
430 kmp_int32 __kmp_use_yield = 1;
431 #endif
432 
433 // This will be 1 if KMP_USE_YIELD environment variable was set explicitly
434 kmp_int32 __kmp_use_yield_exp_set = 0;
435 
436 kmp_uint32 __kmp_yield_init = KMP_INIT_WAIT;
437 kmp_uint32 __kmp_yield_next = KMP_NEXT_WAIT;
438 kmp_uint64 __kmp_pause_init = 1; // for tpause
439 
440 /* ------------------------------------------------------ */
441 /* STATE mostly syncronized with global lock */
442 /* data written to rarely by primary threads, read often by workers */
443 /* TODO: None of this global padding stuff works consistently because the order
444  of declaration is not necessarily correlated to storage order. To fix this,
445  all the important globals must be put in a big structure instead. */
446 KMP_ALIGN_CACHE
447 kmp_info_t **__kmp_threads = NULL;
448 kmp_root_t **__kmp_root = NULL;
449 kmp_old_threads_list_t *__kmp_old_threads_list = NULL;
450 
451 /* data read/written to often by primary threads */
452 KMP_ALIGN_CACHE
453 volatile int __kmp_nth = 0;
454 volatile int __kmp_all_nth = 0;
455 volatile kmp_info_t *__kmp_thread_pool = NULL;
456 volatile kmp_team_t *__kmp_team_pool = NULL;
457 
458 KMP_ALIGN_CACHE
459 std::atomic<int> __kmp_thread_pool_active_nth = 0;
460 
461 /* -------------------------------------------------
462  * GLOBAL/ROOT STATE */
463 KMP_ALIGN_CACHE
464 kmp_global_t __kmp_global;
465 
466 /* ----------------------------------------------- */
467 /* GLOBAL SYNCHRONIZATION LOCKS */
468 /* TODO verify the need for these locks and if they need to be global */
469 
470 #if KMP_USE_INTERNODE_ALIGNMENT
471 /* Multinode systems have larger cache line granularity which can cause
472  * false sharing if the alignment is not large enough for these locks */
473 KMP_ALIGN_CACHE_INTERNODE
474 
475 KMP_BOOTSTRAP_LOCK_INIT(__kmp_initz_lock); /* Control initializations */
476 KMP_ALIGN_CACHE_INTERNODE
477 KMP_BOOTSTRAP_LOCK_INIT(__kmp_forkjoin_lock); /* control fork/join access */
478 KMP_ALIGN_CACHE_INTERNODE
479 KMP_BOOTSTRAP_LOCK_INIT(__kmp_exit_lock); /* exit() is not always thread-safe */
480 #if KMP_USE_MONITOR
481 /* control monitor thread creation */
482 KMP_ALIGN_CACHE_INTERNODE
483 KMP_BOOTSTRAP_LOCK_INIT(__kmp_monitor_lock);
484 #endif
485 /* used for the hack to allow threadprivate cache and __kmp_threads expansion
486  to co-exist */
487 KMP_ALIGN_CACHE_INTERNODE
488 KMP_BOOTSTRAP_LOCK_INIT(__kmp_tp_cached_lock);
489 
490 KMP_ALIGN_CACHE_INTERNODE
491 KMP_LOCK_INIT(__kmp_global_lock); /* Control OS/global access */
492 #else
493 KMP_ALIGN_CACHE
494 
495 KMP_BOOTSTRAP_LOCK_INIT(__kmp_initz_lock); /* Control initializations */
496 KMP_BOOTSTRAP_LOCK_INIT(__kmp_forkjoin_lock); /* control fork/join access */
497 KMP_BOOTSTRAP_LOCK_INIT(__kmp_exit_lock); /* exit() is not always thread-safe */
498 #if KMP_USE_MONITOR
499 /* control monitor thread creation */
500 KMP_BOOTSTRAP_LOCK_INIT(__kmp_monitor_lock);
501 #endif
502 /* used for the hack to allow threadprivate cache and __kmp_threads expansion
503  to co-exist */
504 KMP_BOOTSTRAP_LOCK_INIT(__kmp_tp_cached_lock);
505 
506 KMP_ALIGN(128)
507 KMP_LOCK_INIT(__kmp_global_lock); /* Control OS/global access */
508 #endif
509 
510 /* ----------------------------------------------- */
511 
512 #if KMP_HANDLE_SIGNALS
513 /* Signal handling is disabled by default, because it confuses users: In case of
514  sigsegv (or other trouble) in user code signal handler catches the signal,
515  which then "appears" in the monitor thread (when the monitor executes raise()
516  function). Users see signal in the monitor thread and blame OpenMP RTL.
517 
518  Grant said signal handling required on some older OSes (Irix?) supported by
519  KAI, because bad applications hung but not aborted. Currently it is not a
520  problem for Linux* OS, OS X* and Windows* OS.
521 
522  Grant: Found new hangs for EL4, EL5, and a Fedora Core machine. So I'm
523  putting the default back for now to see if that fixes hangs on those
524  machines.
525 
526  2010-04013 Lev: It was a bug in Fortran RTL. Fortran RTL prints a kind of
527  stack backtrace when program is aborting, but the code is not signal-safe.
528  When multiple signals raised at the same time (which occurs in dynamic
529  negative tests because all the worker threads detects the same error),
530  Fortran RTL may hang. The bug finally fixed in Fortran RTL library provided
531  by Steve R., and will be available soon. */
532 int __kmp_handle_signals = FALSE;
533 #endif
534 
535 #ifdef DEBUG_SUSPEND
536 int get_suspend_count_(void) {
537  int count = __kmp_suspend_count;
538  __kmp_suspend_count = 0;
539  return count;
540 }
541 void set_suspend_count_(int *value) { __kmp_suspend_count = *value; }
542 #endif
543 
544 kmp_target_offload_kind_t __kmp_target_offload = tgt_default;
545 
546 // OMP Pause Resources
547 kmp_pause_status_t __kmp_pause_status = kmp_not_paused;
548 
549 // Nesting mode
550 int __kmp_nesting_mode = 0;
551 int __kmp_nesting_mode_nlevels = 1;
552 int *__kmp_nesting_nth_level;
553 
554 #if OMPX_TASKGRAPH
555 // TDG record & replay
556 int __kmp_tdg_dot = 0;
557 kmp_int32 __kmp_max_tdgs = 100;
558 kmp_tdg_info_t **__kmp_global_tdgs = NULL;
559 kmp_int32 __kmp_curr_tdg_idx =
560  0; // Id of the current TDG being recorded or executed
561 kmp_int32 __kmp_num_tdg = 0;
562 kmp_int32 __kmp_successors_size = 10; // Initial succesor size list for
563  // recording
564 std::atomic<kmp_int32> __kmp_tdg_task_id = 0;
565 #endif
566 // end of file //
567 
sched_type
Definition: kmp.h:350
@ kmp_sch_auto
Definition: kmp.h:357
@ kmp_sch_default
Definition: kmp.h:458
@ kmp_sch_guided_chunked
Definition: kmp.h:355