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_init_middle = FALSE;
48 volatile int __kmp_init_parallel = FALSE;
49 volatile int __kmp_init_hidden_helper = FALSE;
50 volatile int __kmp_init_hidden_helper_threads = FALSE;
51 volatile int __kmp_hidden_helper_team_done = FALSE;
52 #if KMP_USE_MONITOR
53 volatile int __kmp_init_monitor =
54  0; /* 1 - launched, 2 - actually started (Windows* OS only) */
55 #endif
56 volatile int __kmp_init_user_locks = FALSE;
57 
58 /* list of address of allocated caches for commons */
59 kmp_cached_addr_t *__kmp_threadpriv_cache_list = NULL;
60 
61 int __kmp_init_counter = 0;
62 int __kmp_root_counter = 0;
63 int __kmp_version = 0;
64 
65 std::atomic<kmp_int32> __kmp_team_counter = ATOMIC_VAR_INIT(0);
66 std::atomic<kmp_int32> __kmp_task_counter = ATOMIC_VAR_INIT(0);
67 
68 size_t __kmp_stksize = KMP_DEFAULT_STKSIZE;
69 #if KMP_USE_MONITOR
70 size_t __kmp_monitor_stksize = 0; // auto adjust
71 #endif
72 size_t __kmp_stkoffset = KMP_DEFAULT_STKOFFSET;
73 int __kmp_stkpadding = KMP_MIN_STKPADDING;
74 
75 size_t __kmp_malloc_pool_incr = KMP_DEFAULT_MALLOC_POOL_INCR;
76 
77 // Barrier method defaults, settings, and strings.
78 // branch factor = 2^branch_bits (only relevant for tree & hyper barrier types)
79 kmp_uint32 __kmp_barrier_gather_bb_dflt = 2;
80 /* branch_factor = 4 */ /* hyper2: C78980 */
81 kmp_uint32 __kmp_barrier_release_bb_dflt = 2;
82 /* branch_factor = 4 */ /* hyper2: C78980 */
83 
84 kmp_bar_pat_e __kmp_barrier_gather_pat_dflt = bp_hyper_bar;
85 /* hyper2: C78980 */
86 kmp_bar_pat_e __kmp_barrier_release_pat_dflt = bp_hyper_bar;
87 /* hyper2: C78980 */
88 
89 kmp_uint32 __kmp_barrier_gather_branch_bits[bs_last_barrier] = {0};
90 kmp_uint32 __kmp_barrier_release_branch_bits[bs_last_barrier] = {0};
91 kmp_bar_pat_e __kmp_barrier_gather_pattern[bs_last_barrier] = {bp_linear_bar};
92 kmp_bar_pat_e __kmp_barrier_release_pattern[bs_last_barrier] = {bp_linear_bar};
93 char const *__kmp_barrier_branch_bit_env_name[bs_last_barrier] = {
94  "KMP_PLAIN_BARRIER", "KMP_FORKJOIN_BARRIER"
95 #if KMP_FAST_REDUCTION_BARRIER
96  ,
97  "KMP_REDUCTION_BARRIER"
98 #endif // KMP_FAST_REDUCTION_BARRIER
99 };
100 char const *__kmp_barrier_pattern_env_name[bs_last_barrier] = {
101  "KMP_PLAIN_BARRIER_PATTERN", "KMP_FORKJOIN_BARRIER_PATTERN"
102 #if KMP_FAST_REDUCTION_BARRIER
103  ,
104  "KMP_REDUCTION_BARRIER_PATTERN"
105 #endif // KMP_FAST_REDUCTION_BARRIER
106 };
107 char const *__kmp_barrier_type_name[bs_last_barrier] = {"plain", "forkjoin"
108 #if KMP_FAST_REDUCTION_BARRIER
109  ,
110  "reduction"
111 #endif // KMP_FAST_REDUCTION_BARRIER
112 };
113 char const *__kmp_barrier_pattern_name[bp_last_bar] = {
114  "linear", "tree", "hyper", "hierarchical", "dist"};
115 
116 int __kmp_allThreadsSpecified = 0;
117 size_t __kmp_align_alloc = CACHE_LINE;
118 
119 int __kmp_generate_warnings = kmp_warnings_low;
120 int __kmp_reserve_warn = 0;
121 int __kmp_xproc = 0;
122 int __kmp_avail_proc = 0;
123 size_t __kmp_sys_min_stksize = KMP_MIN_STKSIZE;
124 int __kmp_sys_max_nth = KMP_MAX_NTH;
125 int __kmp_max_nth = 0;
126 int __kmp_cg_max_nth = 0;
127 int __kmp_teams_max_nth = 0;
128 int __kmp_threads_capacity = 0;
129 int __kmp_dflt_team_nth = 0;
130 int __kmp_dflt_team_nth_ub = 0;
131 int __kmp_tp_capacity = 0;
132 int __kmp_tp_cached = 0;
133 int __kmp_dispatch_num_buffers = KMP_DFLT_DISP_NUM_BUFF;
134 int __kmp_dflt_max_active_levels = 1; // Nesting off by default
135 bool __kmp_dflt_max_active_levels_set = false; // Don't override set value
136 #if KMP_NESTED_HOT_TEAMS
137 int __kmp_hot_teams_mode = 0; /* 0 - free extra threads when reduced */
138 /* 1 - keep extra threads when reduced */
139 int __kmp_hot_teams_max_level = 1; /* nesting level of hot teams */
140 #endif
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;
157 bool __kmp_wpolicy_passive = false;
158 #if KMP_USE_MONITOR
159 int __kmp_monitor_wakeups = KMP_MIN_MONITOR_WAKEUPS;
160 int __kmp_bt_intervals = KMP_INTERVALS_FROM_BLOCKTIME(KMP_DEFAULT_BLOCKTIME,
161  KMP_MIN_MONITOR_WAKEUPS);
162 #endif
163 #ifdef KMP_ADJUST_BLOCKTIME
164 int __kmp_zero_bt = FALSE;
165 #endif /* KMP_ADJUST_BLOCKTIME */
166 #ifdef KMP_DFLT_NTH_CORES
167 int __kmp_ncores = 0;
168 #endif
169 int __kmp_chunk = 0;
170 int __kmp_force_monotonic = 0;
171 int __kmp_abort_delay = 0;
172 #if KMP_OS_LINUX && defined(KMP_TDATA_GTID)
173 int __kmp_gtid_mode = 3; /* use __declspec(thread) TLS to store gtid */
174 int __kmp_adjust_gtid_mode = FALSE;
175 #elif KMP_OS_WINDOWS
176 int __kmp_gtid_mode = 2; /* use TLS functions to store gtid */
177 int __kmp_adjust_gtid_mode = FALSE;
178 #else
179 int __kmp_gtid_mode = 0; /* select method to get gtid based on #threads */
180 int __kmp_adjust_gtid_mode = TRUE;
181 #endif /* KMP_OS_LINUX && defined(KMP_TDATA_GTID) */
182 #ifdef KMP_TDATA_GTID
183 KMP_THREAD_LOCAL int __kmp_gtid = KMP_GTID_DNE;
184 #endif /* KMP_TDATA_GTID */
185 int __kmp_tls_gtid_min = INT_MAX;
186 int __kmp_foreign_tp = TRUE;
187 #if KMP_ARCH_X86 || KMP_ARCH_X86_64
188 int __kmp_inherit_fp_control = TRUE;
189 kmp_int16 __kmp_init_x87_fpu_control_word = 0;
190 kmp_uint32 __kmp_init_mxcsr = 0;
191 #endif /* KMP_ARCH_X86 || KMP_ARCH_X86_64 */
192 
193 #ifdef USE_LOAD_BALANCE
194 double __kmp_load_balance_interval = 1.0;
195 #endif /* USE_LOAD_BALANCE */
196 
197 kmp_nested_nthreads_t __kmp_nested_nth = {NULL, 0, 0};
198 
199 #if KMP_USE_ADAPTIVE_LOCKS
200 
201 kmp_adaptive_backoff_params_t __kmp_adaptive_backoff_params = {
202  1, 1024}; // TODO: tune it!
203 
204 #if KMP_DEBUG_ADAPTIVE_LOCKS
205 const char *__kmp_speculative_statsfile = "-";
206 #endif
207 
208 #endif // KMP_USE_ADAPTIVE_LOCKS
209 
210 int __kmp_display_env = FALSE;
211 int __kmp_display_env_verbose = FALSE;
212 int __kmp_omp_cancellation = FALSE;
213 int __kmp_nteams = 0;
214 int __kmp_teams_thread_limit = 0;
215 
216 #if KMP_HAVE_MWAIT || KMP_HAVE_UMWAIT
217 int __kmp_user_level_mwait = FALSE;
218 int __kmp_umwait_enabled = FALSE;
219 int __kmp_mwait_enabled = FALSE;
220 int __kmp_mwait_hints = 0;
221 #endif
222 
223 #if KMP_HAVE_UMWAIT
224 int __kmp_waitpkg_enabled = 0;
225 int __kmp_tpause_state = 0;
226 int __kmp_tpause_hint = 1;
227 int __kmp_tpause_enabled = 0;
228 #endif
229 
230 /* map OMP 3.0 schedule types with our internal schedule types */
231 enum sched_type __kmp_sch_map[kmp_sched_upper - kmp_sched_lower_ext +
232  kmp_sched_upper_std - kmp_sched_lower - 2] = {
233  kmp_sch_static_chunked, // ==> kmp_sched_static = 1
234  kmp_sch_dynamic_chunked, // ==> kmp_sched_dynamic = 2
235  kmp_sch_guided_chunked, // ==> kmp_sched_guided = 3
236  kmp_sch_auto, // ==> kmp_sched_auto = 4
237  kmp_sch_trapezoidal // ==> kmp_sched_trapezoidal = 101
238  // will likely not be used, introduced here just to debug the code
239  // of public intel extension schedules
240 };
241 
242 #if KMP_OS_LINUX
243 enum clock_function_type __kmp_clock_function;
244 int __kmp_clock_function_param;
245 #endif /* KMP_OS_LINUX */
246 
247 #if KMP_MIC_SUPPORTED
248 enum mic_type __kmp_mic_type = non_mic;
249 #endif
250 
251 #if KMP_AFFINITY_SUPPORTED
252 
253 KMPAffinity *__kmp_affinity_dispatch = NULL;
254 
255 #if KMP_USE_HWLOC
256 int __kmp_hwloc_error = FALSE;
257 hwloc_topology_t __kmp_hwloc_topology = NULL;
258 #endif
259 
260 #if KMP_OS_WINDOWS
261 #if KMP_GROUP_AFFINITY
262 int __kmp_num_proc_groups = 1;
263 #endif /* KMP_GROUP_AFFINITY */
264 kmp_GetActiveProcessorCount_t __kmp_GetActiveProcessorCount = NULL;
265 kmp_GetActiveProcessorGroupCount_t __kmp_GetActiveProcessorGroupCount = NULL;
266 kmp_GetThreadGroupAffinity_t __kmp_GetThreadGroupAffinity = NULL;
267 kmp_SetThreadGroupAffinity_t __kmp_SetThreadGroupAffinity = NULL;
268 #endif /* KMP_OS_WINDOWS */
269 
270 size_t __kmp_affin_mask_size = 0;
271 enum affinity_type __kmp_affinity_type = affinity_default;
272 kmp_hw_t __kmp_affinity_gran = KMP_HW_UNKNOWN;
273 int __kmp_affinity_gran_levels = -1;
274 int __kmp_affinity_dups = TRUE;
275 enum affinity_top_method __kmp_affinity_top_method =
276  affinity_top_method_default;
277 int __kmp_affinity_compact = 0;
278 int __kmp_affinity_offset = 0;
279 int __kmp_affinity_verbose = FALSE;
280 int __kmp_affinity_warnings = TRUE;
281 int __kmp_affinity_respect_mask = affinity_respect_mask_default;
282 char *__kmp_affinity_proclist = NULL;
283 kmp_affin_mask_t *__kmp_affinity_masks = NULL;
284 unsigned __kmp_affinity_num_masks = 0;
285 
286 char *__kmp_cpuinfo_file = NULL;
287 
288 #endif /* KMP_AFFINITY_SUPPORTED */
289 
290 kmp_nested_proc_bind_t __kmp_nested_proc_bind = {NULL, 0, 0};
291 kmp_proc_bind_t __kmp_teams_proc_bind = proc_bind_spread;
292 int __kmp_affinity_num_places = 0;
293 int __kmp_display_affinity = FALSE;
294 char *__kmp_affinity_format = NULL;
295 
296 kmp_int32 __kmp_default_device = 0;
297 
298 kmp_tasking_mode_t __kmp_tasking_mode = tskm_task_teams;
299 kmp_int32 __kmp_max_task_priority = 0;
300 kmp_uint64 __kmp_taskloop_min_tasks = 0;
301 
302 int __kmp_memkind_available = 0;
303 omp_allocator_handle_t const omp_null_allocator = NULL;
304 omp_allocator_handle_t const omp_default_mem_alloc =
305  (omp_allocator_handle_t const)1;
306 omp_allocator_handle_t const omp_large_cap_mem_alloc =
307  (omp_allocator_handle_t const)2;
308 omp_allocator_handle_t const omp_const_mem_alloc =
309  (omp_allocator_handle_t const)3;
310 omp_allocator_handle_t const omp_high_bw_mem_alloc =
311  (omp_allocator_handle_t const)4;
312 omp_allocator_handle_t const omp_low_lat_mem_alloc =
313  (omp_allocator_handle_t const)5;
314 omp_allocator_handle_t const omp_cgroup_mem_alloc =
315  (omp_allocator_handle_t const)6;
316 omp_allocator_handle_t const omp_pteam_mem_alloc =
317  (omp_allocator_handle_t const)7;
318 omp_allocator_handle_t const omp_thread_mem_alloc =
319  (omp_allocator_handle_t const)8;
320 omp_allocator_handle_t const llvm_omp_target_host_mem_alloc =
321  (omp_allocator_handle_t const)100;
322 omp_allocator_handle_t const llvm_omp_target_shared_mem_alloc =
323  (omp_allocator_handle_t const)101;
324 omp_allocator_handle_t const llvm_omp_target_device_mem_alloc =
325  (omp_allocator_handle_t const)102;
326 omp_allocator_handle_t const kmp_max_mem_alloc =
327  (omp_allocator_handle_t const)1024;
328 omp_allocator_handle_t __kmp_def_allocator = omp_default_mem_alloc;
329 
330 omp_memspace_handle_t const omp_default_mem_space =
331  (omp_memspace_handle_t const)0;
332 omp_memspace_handle_t const omp_large_cap_mem_space =
333  (omp_memspace_handle_t const)1;
334 omp_memspace_handle_t const omp_const_mem_space =
335  (omp_memspace_handle_t const)2;
336 omp_memspace_handle_t const omp_high_bw_mem_space =
337  (omp_memspace_handle_t const)3;
338 omp_memspace_handle_t const omp_low_lat_mem_space =
339  (omp_memspace_handle_t const)4;
340 omp_memspace_handle_t const llvm_omp_target_host_mem_space =
341  (omp_memspace_handle_t const)100;
342 omp_memspace_handle_t const llvm_omp_target_shared_mem_space =
343  (omp_memspace_handle_t const)101;
344 omp_memspace_handle_t const llvm_omp_target_device_mem_space =
345  (omp_memspace_handle_t const)102;
346 
347 /* This check ensures that the compiler is passing the correct data type for the
348  flags formal parameter of the function kmpc_omp_task_alloc(). If the type is
349  not a 4-byte type, then give an error message about a non-positive length
350  array pointing here. If that happens, the kmp_tasking_flags_t structure must
351  be redefined to have exactly 32 bits. */
352 KMP_BUILD_ASSERT(sizeof(kmp_tasking_flags_t) == 4);
353 
354 int __kmp_task_stealing_constraint = 1; /* Constrain task stealing by default */
355 int __kmp_enable_task_throttling = 1;
356 
357 #ifdef DEBUG_SUSPEND
358 int __kmp_suspend_count = 0;
359 #endif
360 
361 int __kmp_settings = FALSE;
362 int __kmp_duplicate_library_ok = 0;
363 #if USE_ITT_BUILD
364 int __kmp_forkjoin_frames = 1;
365 int __kmp_forkjoin_frames_mode = 3;
366 #endif
367 PACKED_REDUCTION_METHOD_T __kmp_force_reduction_method =
368  reduction_method_not_defined;
369 int __kmp_determ_red = FALSE;
370 
371 #ifdef KMP_DEBUG
372 int kmp_a_debug = 0;
373 int kmp_b_debug = 0;
374 int kmp_c_debug = 0;
375 int kmp_d_debug = 0;
376 int kmp_e_debug = 0;
377 int kmp_f_debug = 0;
378 int kmp_diag = 0;
379 #endif
380 
381 /* For debug information logging using rotating buffer */
382 int __kmp_debug_buf =
383  FALSE; /* TRUE means use buffer, FALSE means print to stderr */
384 int __kmp_debug_buf_lines =
385  KMP_DEBUG_BUF_LINES_INIT; /* Lines of debug stored in buffer */
386 int __kmp_debug_buf_chars =
387  KMP_DEBUG_BUF_CHARS_INIT; /* Characters allowed per line in buffer */
388 int __kmp_debug_buf_atomic =
389  FALSE; /* TRUE means use atomic update of buffer entry pointer */
390 
391 char *__kmp_debug_buffer = NULL; /* Debug buffer itself */
392 std::atomic<int> __kmp_debug_count =
393  ATOMIC_VAR_INIT(0); /* number of lines printed in buffer so far */
394 int __kmp_debug_buf_warn_chars =
395  0; /* Keep track of char increase recommended in warnings */
396 /* end rotating debug buffer */
397 
398 #ifdef KMP_DEBUG
399 int __kmp_par_range; /* +1 => only go par for constructs in range */
400 /* -1 => only go par for constructs outside range */
401 char __kmp_par_range_routine[KMP_PAR_RANGE_ROUTINE_LEN] = {'\0'};
402 char __kmp_par_range_filename[KMP_PAR_RANGE_FILENAME_LEN] = {'\0'};
403 int __kmp_par_range_lb = 0;
404 int __kmp_par_range_ub = INT_MAX;
405 #endif /* KMP_DEBUG */
406 
407 /* For printing out dynamic storage map for threads and teams */
408 int __kmp_storage_map =
409  FALSE; /* True means print storage map for threads and teams */
410 int __kmp_storage_map_verbose =
411  FALSE; /* True means storage map includes placement info */
412 int __kmp_storage_map_verbose_specified = FALSE;
413 /* Initialize the library data structures when we fork a child process, defaults
414  * to TRUE */
415 int __kmp_need_register_atfork =
416  TRUE; /* At initialization, call pthread_atfork to install fork handler */
417 int __kmp_need_register_atfork_specified = TRUE;
418 
419 int __kmp_env_stksize = FALSE; /* KMP_STACKSIZE specified? */
420 int __kmp_env_blocktime = FALSE; /* KMP_BLOCKTIME specified? */
421 int __kmp_env_checks = FALSE; /* KMP_CHECKS specified? */
422 int __kmp_env_consistency_check = FALSE; /* KMP_CONSISTENCY_CHECK specified? */
423 
424 // From KMP_USE_YIELD:
425 // 0 = never yield;
426 // 1 = always yield (default);
427 // 2 = yield only if oversubscribed
428 #if KMP_OS_DARWIN && KMP_ARCH_AARCH64
429 // Set to 0 for environments where yield is slower
430 kmp_int32 __kmp_use_yield = 0;
431 #else
432 kmp_int32 __kmp_use_yield = 1;
433 #endif
434 
435 // This will be 1 if KMP_USE_YIELD environment variable was set explicitly
436 kmp_int32 __kmp_use_yield_exp_set = 0;
437 
438 kmp_uint32 __kmp_yield_init = KMP_INIT_WAIT;
439 kmp_uint32 __kmp_yield_next = KMP_NEXT_WAIT;
440 kmp_uint64 __kmp_pause_init = 1; // for tpause
441 
442 /* ------------------------------------------------------ */
443 /* STATE mostly syncronized with global lock */
444 /* data written to rarely by primary threads, read often by workers */
445 /* TODO: None of this global padding stuff works consistently because the order
446  of declaration is not necessarily correlated to storage order. To fix this,
447  all the important globals must be put in a big structure instead. */
448 KMP_ALIGN_CACHE
449 kmp_info_t **__kmp_threads = NULL;
450 kmp_root_t **__kmp_root = NULL;
451 kmp_old_threads_list_t *__kmp_old_threads_list = NULL;
452 
453 /* data read/written to often by primary threads */
454 KMP_ALIGN_CACHE
455 volatile int __kmp_nth = 0;
456 volatile int __kmp_all_nth = 0;
457 volatile kmp_info_t *__kmp_thread_pool = NULL;
458 volatile kmp_team_t *__kmp_team_pool = NULL;
459 
460 KMP_ALIGN_CACHE
461 std::atomic<int> __kmp_thread_pool_active_nth = ATOMIC_VAR_INIT(0);
462 
463 /* -------------------------------------------------
464  * GLOBAL/ROOT STATE */
465 KMP_ALIGN_CACHE
466 kmp_global_t __kmp_global;
467 
468 /* ----------------------------------------------- */
469 /* GLOBAL SYNCHRONIZATION LOCKS */
470 /* TODO verify the need for these locks and if they need to be global */
471 
472 #if KMP_USE_INTERNODE_ALIGNMENT
473 /* Multinode systems have larger cache line granularity which can cause
474  * false sharing if the alignment is not large enough for these locks */
475 KMP_ALIGN_CACHE_INTERNODE
476 
477 KMP_BOOTSTRAP_LOCK_INIT(__kmp_initz_lock); /* Control initializations */
478 KMP_ALIGN_CACHE_INTERNODE
479 KMP_BOOTSTRAP_LOCK_INIT(__kmp_forkjoin_lock); /* control fork/join access */
480 KMP_ALIGN_CACHE_INTERNODE
481 KMP_BOOTSTRAP_LOCK_INIT(__kmp_exit_lock); /* exit() is not always thread-safe */
482 #if KMP_USE_MONITOR
483 /* control monitor thread creation */
484 KMP_ALIGN_CACHE_INTERNODE
485 KMP_BOOTSTRAP_LOCK_INIT(__kmp_monitor_lock);
486 #endif
487 /* used for the hack to allow threadprivate cache and __kmp_threads expansion
488  to co-exist */
489 KMP_ALIGN_CACHE_INTERNODE
490 KMP_BOOTSTRAP_LOCK_INIT(__kmp_tp_cached_lock);
491 
492 KMP_ALIGN_CACHE_INTERNODE
493 KMP_LOCK_INIT(__kmp_global_lock); /* Control OS/global access */
494 KMP_ALIGN_CACHE_INTERNODE
495 kmp_queuing_lock_t __kmp_dispatch_lock; /* Control dispatch access */
496 KMP_ALIGN_CACHE_INTERNODE
497 KMP_LOCK_INIT(__kmp_debug_lock); /* Control I/O access for KMP_DEBUG */
498 #else
499 KMP_ALIGN_CACHE
500 
501 KMP_BOOTSTRAP_LOCK_INIT(__kmp_initz_lock); /* Control initializations */
502 KMP_BOOTSTRAP_LOCK_INIT(__kmp_forkjoin_lock); /* control fork/join access */
503 KMP_BOOTSTRAP_LOCK_INIT(__kmp_exit_lock); /* exit() is not always thread-safe */
504 #if KMP_USE_MONITOR
505 /* control monitor thread creation */
506 KMP_BOOTSTRAP_LOCK_INIT(__kmp_monitor_lock);
507 #endif
508 /* used for the hack to allow threadprivate cache and __kmp_threads expansion
509  to co-exist */
510 KMP_BOOTSTRAP_LOCK_INIT(__kmp_tp_cached_lock);
511 
512 KMP_ALIGN(128)
513 KMP_LOCK_INIT(__kmp_global_lock); /* Control OS/global access */
514 KMP_ALIGN(128)
515 kmp_queuing_lock_t __kmp_dispatch_lock; /* Control dispatch access */
516 KMP_ALIGN(128)
517 KMP_LOCK_INIT(__kmp_debug_lock); /* Control I/O access for KMP_DEBUG */
518 #endif
519 
520 /* ----------------------------------------------- */
521 
522 #if KMP_HANDLE_SIGNALS
523 /* Signal handling is disabled by default, because it confuses users: In case of
524  sigsegv (or other trouble) in user code signal handler catches the signal,
525  which then "appears" in the monitor thread (when the monitor executes raise()
526  function). Users see signal in the monitor thread and blame OpenMP RTL.
527 
528  Grant said signal handling required on some older OSes (Irix?) supported by
529  KAI, because bad applications hung but not aborted. Currently it is not a
530  problem for Linux* OS, OS X* and Windows* OS.
531 
532  Grant: Found new hangs for EL4, EL5, and a Fedora Core machine. So I'm
533  putting the default back for now to see if that fixes hangs on those
534  machines.
535 
536  2010-04013 Lev: It was a bug in Fortran RTL. Fortran RTL prints a kind of
537  stack backtrace when program is aborting, but the code is not signal-safe.
538  When multiple signals raised at the same time (which occurs in dynamic
539  negative tests because all the worker threads detects the same error),
540  Fortran RTL may hang. The bug finally fixed in Fortran RTL library provided
541  by Steve R., and will be available soon. */
542 int __kmp_handle_signals = FALSE;
543 #endif
544 
545 #ifdef DEBUG_SUSPEND
546 int get_suspend_count_(void) {
547  int count = __kmp_suspend_count;
548  __kmp_suspend_count = 0;
549  return count;
550 }
551 void set_suspend_count_(int *value) { __kmp_suspend_count = *value; }
552 #endif
553 
554 // Symbols for MS mutual detection.
555 int _You_must_link_with_exactly_one_OpenMP_library = 1;
556 int _You_must_link_with_Intel_OpenMP_library = 1;
557 #if KMP_OS_WINDOWS && (KMP_VERSION_MAJOR > 4)
558 int _You_must_link_with_Microsoft_OpenMP_library = 1;
559 #endif
560 
561 kmp_target_offload_kind_t __kmp_target_offload = tgt_default;
562 
563 // OMP Pause Resources
564 kmp_pause_status_t __kmp_pause_status = kmp_not_paused;
565 
566 // Nesting mode
567 int __kmp_nesting_mode = 0;
568 int __kmp_nesting_mode_nlevels = 1;
569 int *__kmp_nesting_nth_level;
570 
571 // end of file //
sched_type
Definition: kmp.h:357
@ kmp_sch_auto
Definition: kmp.h:364
@ kmp_sch_default
Definition: kmp.h:465
@ kmp_sch_guided_chunked
Definition: kmp.h:362