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] = {"linear", "tree",
114  "hyper", "hierarchical"};
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 #if KMP_USE_MONITOR
158 int __kmp_monitor_wakeups = KMP_MIN_MONITOR_WAKEUPS;
159 int __kmp_bt_intervals = KMP_INTERVALS_FROM_BLOCKTIME(KMP_DEFAULT_BLOCKTIME,
160  KMP_MIN_MONITOR_WAKEUPS);
161 #endif
162 #ifdef KMP_ADJUST_BLOCKTIME
163 int __kmp_zero_bt = FALSE;
164 #endif /* KMP_ADJUST_BLOCKTIME */
165 #ifdef KMP_DFLT_NTH_CORES
166 int __kmp_ncores = 0;
167 #endif
168 int __kmp_chunk = 0;
169 int __kmp_abort_delay = 0;
170 #if KMP_OS_LINUX && defined(KMP_TDATA_GTID)
171 int __kmp_gtid_mode = 3; /* use __declspec(thread) TLS to store gtid */
172 int __kmp_adjust_gtid_mode = FALSE;
173 #elif KMP_OS_WINDOWS
174 int __kmp_gtid_mode = 2; /* use TLS functions to store gtid */
175 int __kmp_adjust_gtid_mode = FALSE;
176 #else
177 int __kmp_gtid_mode = 0; /* select method to get gtid based on #threads */
178 int __kmp_adjust_gtid_mode = TRUE;
179 #endif /* KMP_OS_LINUX && defined(KMP_TDATA_GTID) */
180 #ifdef KMP_TDATA_GTID
181 KMP_THREAD_LOCAL int __kmp_gtid = KMP_GTID_DNE;
182 #endif /* KMP_TDATA_GTID */
183 int __kmp_tls_gtid_min = INT_MAX;
184 int __kmp_foreign_tp = TRUE;
185 #if KMP_ARCH_X86 || KMP_ARCH_X86_64
186 int __kmp_inherit_fp_control = TRUE;
187 kmp_int16 __kmp_init_x87_fpu_control_word = 0;
188 kmp_uint32 __kmp_init_mxcsr = 0;
189 #endif /* KMP_ARCH_X86 || KMP_ARCH_X86_64 */
190 
191 #ifdef USE_LOAD_BALANCE
192 double __kmp_load_balance_interval = 1.0;
193 #endif /* USE_LOAD_BALANCE */
194 
195 kmp_nested_nthreads_t __kmp_nested_nth = {NULL, 0, 0};
196 
197 #if KMP_USE_ADAPTIVE_LOCKS
198 
199 kmp_adaptive_backoff_params_t __kmp_adaptive_backoff_params = {
200  1, 1024}; // TODO: tune it!
201 
202 #if KMP_DEBUG_ADAPTIVE_LOCKS
203 const char *__kmp_speculative_statsfile = "-";
204 #endif
205 
206 #endif // KMP_USE_ADAPTIVE_LOCKS
207 
208 int __kmp_display_env = FALSE;
209 int __kmp_display_env_verbose = FALSE;
210 int __kmp_omp_cancellation = FALSE;
211 
212 #if KMP_HAVE_MWAIT || KMP_HAVE_UMWAIT
213 int __kmp_user_level_mwait = FALSE;
214 int __kmp_umwait_enabled = FALSE;
215 int __kmp_mwait_enabled = FALSE;
216 int __kmp_mwait_hints = 0;
217 #endif
218 
219 /* map OMP 3.0 schedule types with our internal schedule types */
220 enum sched_type __kmp_sch_map[kmp_sched_upper - kmp_sched_lower_ext +
221  kmp_sched_upper_std - kmp_sched_lower - 2] = {
222  kmp_sch_static_chunked, // ==> kmp_sched_static = 1
223  kmp_sch_dynamic_chunked, // ==> kmp_sched_dynamic = 2
224  kmp_sch_guided_chunked, // ==> kmp_sched_guided = 3
225  kmp_sch_auto, // ==> kmp_sched_auto = 4
226  kmp_sch_trapezoidal // ==> kmp_sched_trapezoidal = 101
227  // will likely not be used, introduced here just to debug the code
228  // of public intel extension schedules
229 };
230 
231 #if KMP_OS_LINUX
232 enum clock_function_type __kmp_clock_function;
233 int __kmp_clock_function_param;
234 #endif /* KMP_OS_LINUX */
235 
236 #if KMP_MIC_SUPPORTED
237 enum mic_type __kmp_mic_type = non_mic;
238 #endif
239 
240 #if KMP_AFFINITY_SUPPORTED
241 
242 KMPAffinity *__kmp_affinity_dispatch = NULL;
243 
244 #if KMP_USE_HWLOC
245 int __kmp_hwloc_error = FALSE;
246 hwloc_topology_t __kmp_hwloc_topology = NULL;
247 int __kmp_numa_detected = FALSE;
248 int __kmp_tile_depth = 0;
249 #endif
250 
251 #if KMP_OS_WINDOWS
252 #if KMP_GROUP_AFFINITY
253 int __kmp_num_proc_groups = 1;
254 #endif /* KMP_GROUP_AFFINITY */
255 kmp_GetActiveProcessorCount_t __kmp_GetActiveProcessorCount = NULL;
256 kmp_GetActiveProcessorGroupCount_t __kmp_GetActiveProcessorGroupCount = NULL;
257 kmp_GetThreadGroupAffinity_t __kmp_GetThreadGroupAffinity = NULL;
258 kmp_SetThreadGroupAffinity_t __kmp_SetThreadGroupAffinity = NULL;
259 #endif /* KMP_OS_WINDOWS */
260 
261 size_t __kmp_affin_mask_size = 0;
262 enum affinity_type __kmp_affinity_type = affinity_default;
263 enum affinity_gran __kmp_affinity_gran = affinity_gran_default;
264 int __kmp_affinity_gran_levels = -1;
265 int __kmp_affinity_dups = TRUE;
266 enum affinity_top_method __kmp_affinity_top_method =
267  affinity_top_method_default;
268 int __kmp_affinity_compact = 0;
269 int __kmp_affinity_offset = 0;
270 int __kmp_affinity_verbose = FALSE;
271 int __kmp_affinity_warnings = TRUE;
272 int __kmp_affinity_respect_mask = affinity_respect_mask_default;
273 char *__kmp_affinity_proclist = NULL;
274 kmp_affin_mask_t *__kmp_affinity_masks = NULL;
275 unsigned __kmp_affinity_num_masks = 0;
276 
277 char *__kmp_cpuinfo_file = NULL;
278 
279 #endif /* KMP_AFFINITY_SUPPORTED */
280 
281 kmp_nested_proc_bind_t __kmp_nested_proc_bind = {NULL, 0, 0};
282 int __kmp_affinity_num_places = 0;
283 int __kmp_display_affinity = FALSE;
284 char *__kmp_affinity_format = NULL;
285 
286 kmp_hws_item_t __kmp_hws_socket = {0, 0};
287 kmp_hws_item_t __kmp_hws_die = {0, 0};
288 kmp_hws_item_t __kmp_hws_node = {0, 0};
289 kmp_hws_item_t __kmp_hws_tile = {0, 0};
290 kmp_hws_item_t __kmp_hws_core = {0, 0};
291 kmp_hws_item_t __kmp_hws_proc = {0, 0};
292 int __kmp_hws_requested = 0;
293 int __kmp_hws_abs_flag = 0; // absolute or per-item number requested
294 
295 kmp_int32 __kmp_default_device = 0;
296 
297 kmp_tasking_mode_t __kmp_tasking_mode = tskm_task_teams;
298 kmp_int32 __kmp_max_task_priority = 0;
299 kmp_uint64 __kmp_taskloop_min_tasks = 0;
300 
301 int __kmp_memkind_available = 0;
302 omp_allocator_handle_t const omp_null_allocator = NULL;
303 omp_allocator_handle_t const omp_default_mem_alloc =
304  (omp_allocator_handle_t const)1;
305 omp_allocator_handle_t const omp_large_cap_mem_alloc =
306  (omp_allocator_handle_t const)2;
307 omp_allocator_handle_t const omp_const_mem_alloc =
308  (omp_allocator_handle_t const)3;
309 omp_allocator_handle_t const omp_high_bw_mem_alloc =
310  (omp_allocator_handle_t const)4;
311 omp_allocator_handle_t const omp_low_lat_mem_alloc =
312  (omp_allocator_handle_t const)5;
313 omp_allocator_handle_t const omp_cgroup_mem_alloc =
314  (omp_allocator_handle_t const)6;
315 omp_allocator_handle_t const omp_pteam_mem_alloc =
316  (omp_allocator_handle_t const)7;
317 omp_allocator_handle_t const omp_thread_mem_alloc =
318  (omp_allocator_handle_t const)8;
319 omp_allocator_handle_t const kmp_max_mem_alloc =
320  (omp_allocator_handle_t const)1024;
321 omp_allocator_handle_t __kmp_def_allocator = omp_default_mem_alloc;
322 
323 omp_memspace_handle_t const omp_default_mem_space =
324  (omp_memspace_handle_t const)0;
325 omp_memspace_handle_t const omp_large_cap_mem_space =
326  (omp_memspace_handle_t const)1;
327 omp_memspace_handle_t const omp_const_mem_space =
328  (omp_memspace_handle_t const)2;
329 omp_memspace_handle_t const omp_high_bw_mem_space =
330  (omp_memspace_handle_t const)3;
331 omp_memspace_handle_t const omp_low_lat_mem_space =
332  (omp_memspace_handle_t const)4;
333 
334 /* This check ensures that the compiler is passing the correct data type for the
335  flags formal parameter of the function kmpc_omp_task_alloc(). If the type is
336  not a 4-byte type, then give an error message about a non-positive length
337  array pointing here. If that happens, the kmp_tasking_flags_t structure must
338  be redefined to have exactly 32 bits. */
339 KMP_BUILD_ASSERT(sizeof(kmp_tasking_flags_t) == 4);
340 
341 int __kmp_task_stealing_constraint = 1; /* Constrain task stealing by default */
342 int __kmp_enable_task_throttling = 1;
343 
344 #ifdef DEBUG_SUSPEND
345 int __kmp_suspend_count = 0;
346 #endif
347 
348 int __kmp_settings = FALSE;
349 int __kmp_duplicate_library_ok = 0;
350 #if USE_ITT_BUILD
351 int __kmp_forkjoin_frames = 1;
352 int __kmp_forkjoin_frames_mode = 3;
353 #endif
354 PACKED_REDUCTION_METHOD_T __kmp_force_reduction_method =
355  reduction_method_not_defined;
356 int __kmp_determ_red = FALSE;
357 
358 #ifdef KMP_DEBUG
359 int kmp_a_debug = 0;
360 int kmp_b_debug = 0;
361 int kmp_c_debug = 0;
362 int kmp_d_debug = 0;
363 int kmp_e_debug = 0;
364 int kmp_f_debug = 0;
365 int kmp_diag = 0;
366 #endif
367 
368 /* For debug information logging using rotating buffer */
369 int __kmp_debug_buf =
370  FALSE; /* TRUE means use buffer, FALSE means print to stderr */
371 int __kmp_debug_buf_lines =
372  KMP_DEBUG_BUF_LINES_INIT; /* Lines of debug stored in buffer */
373 int __kmp_debug_buf_chars =
374  KMP_DEBUG_BUF_CHARS_INIT; /* Characters allowed per line in buffer */
375 int __kmp_debug_buf_atomic =
376  FALSE; /* TRUE means use atomic update of buffer entry pointer */
377 
378 char *__kmp_debug_buffer = NULL; /* Debug buffer itself */
379 std::atomic<int> __kmp_debug_count =
380  ATOMIC_VAR_INIT(0); /* number of lines printed in buffer so far */
381 int __kmp_debug_buf_warn_chars =
382  0; /* Keep track of char increase recommended in warnings */
383 /* end rotating debug buffer */
384 
385 #ifdef KMP_DEBUG
386 int __kmp_par_range; /* +1 => only go par for constructs in range */
387 /* -1 => only go par for constructs outside range */
388 char __kmp_par_range_routine[KMP_PAR_RANGE_ROUTINE_LEN] = {'\0'};
389 char __kmp_par_range_filename[KMP_PAR_RANGE_FILENAME_LEN] = {'\0'};
390 int __kmp_par_range_lb = 0;
391 int __kmp_par_range_ub = INT_MAX;
392 #endif /* KMP_DEBUG */
393 
394 /* For printing out dynamic storage map for threads and teams */
395 int __kmp_storage_map =
396  FALSE; /* True means print storage map for threads and teams */
397 int __kmp_storage_map_verbose =
398  FALSE; /* True means storage map includes placement info */
399 int __kmp_storage_map_verbose_specified = FALSE;
400 /* Initialize the library data structures when we fork a child process, defaults
401  * to TRUE */
402 int __kmp_need_register_atfork =
403  TRUE; /* At initialization, call pthread_atfork to install fork handler */
404 int __kmp_need_register_atfork_specified = TRUE;
405 
406 int __kmp_env_stksize = FALSE; /* KMP_STACKSIZE specified? */
407 int __kmp_env_blocktime = FALSE; /* KMP_BLOCKTIME specified? */
408 int __kmp_env_checks = FALSE; /* KMP_CHECKS specified? */
409 int __kmp_env_consistency_check = FALSE; /* KMP_CONSISTENCY_CHECK specified? */
410 
411 // From KMP_USE_YIELD:
412 // 0 = never yield;
413 // 1 = always yield (default);
414 // 2 = yield only if oversubscribed
415 kmp_int32 __kmp_use_yield = 1;
416 // This will be 1 if KMP_USE_YIELD environment variable was set explicitly
417 kmp_int32 __kmp_use_yield_exp_set = 0;
418 
419 kmp_uint32 __kmp_yield_init = KMP_INIT_WAIT;
420 kmp_uint32 __kmp_yield_next = KMP_NEXT_WAIT;
421 
422 /* ------------------------------------------------------ */
423 /* STATE mostly syncronized with global lock */
424 /* data written to rarely by masters, read often by workers */
425 /* TODO: None of this global padding stuff works consistently because the order
426  of declaration is not necessarily correlated to storage order. To fix this,
427  all the important globals must be put in a big structure instead. */
428 KMP_ALIGN_CACHE
429 kmp_info_t **__kmp_threads = NULL;
430 kmp_root_t **__kmp_root = NULL;
431 
432 /* data read/written to often by masters */
433 KMP_ALIGN_CACHE
434 volatile int __kmp_nth = 0;
435 volatile int __kmp_all_nth = 0;
436 volatile kmp_info_t *__kmp_thread_pool = NULL;
437 volatile kmp_team_t *__kmp_team_pool = NULL;
438 
439 KMP_ALIGN_CACHE
440 std::atomic<int> __kmp_thread_pool_active_nth = ATOMIC_VAR_INIT(0);
441 
442 /* -------------------------------------------------
443  * GLOBAL/ROOT STATE */
444 KMP_ALIGN_CACHE
445 kmp_global_t __kmp_global;
446 
447 /* ----------------------------------------------- */
448 /* GLOBAL SYNCHRONIZATION LOCKS */
449 /* TODO verify the need for these locks and if they need to be global */
450 
451 #if KMP_USE_INTERNODE_ALIGNMENT
452 /* Multinode systems have larger cache line granularity which can cause
453  * false sharing if the alignment is not large enough for these locks */
454 KMP_ALIGN_CACHE_INTERNODE
455 
456 KMP_BOOTSTRAP_LOCK_INIT(__kmp_initz_lock); /* Control initializations */
457 KMP_ALIGN_CACHE_INTERNODE
458 KMP_BOOTSTRAP_LOCK_INIT(__kmp_forkjoin_lock); /* control fork/join access */
459 KMP_ALIGN_CACHE_INTERNODE
460 KMP_BOOTSTRAP_LOCK_INIT(__kmp_exit_lock); /* exit() is not always thread-safe */
461 #if KMP_USE_MONITOR
462 /* control monitor thread creation */
463 KMP_ALIGN_CACHE_INTERNODE
464 KMP_BOOTSTRAP_LOCK_INIT(__kmp_monitor_lock);
465 #endif
466 /* used for the hack to allow threadprivate cache and __kmp_threads expansion
467  to co-exist */
468 KMP_ALIGN_CACHE_INTERNODE
469 KMP_BOOTSTRAP_LOCK_INIT(__kmp_tp_cached_lock);
470 
471 KMP_ALIGN_CACHE_INTERNODE
472 KMP_LOCK_INIT(__kmp_global_lock); /* Control OS/global access */
473 KMP_ALIGN_CACHE_INTERNODE
474 kmp_queuing_lock_t __kmp_dispatch_lock; /* Control dispatch access */
475 KMP_ALIGN_CACHE_INTERNODE
476 KMP_LOCK_INIT(__kmp_debug_lock); /* Control I/O access for KMP_DEBUG */
477 #else
478 KMP_ALIGN_CACHE
479 
480 KMP_BOOTSTRAP_LOCK_INIT(__kmp_initz_lock); /* Control initializations */
481 KMP_BOOTSTRAP_LOCK_INIT(__kmp_forkjoin_lock); /* control fork/join access */
482 KMP_BOOTSTRAP_LOCK_INIT(__kmp_exit_lock); /* exit() is not always thread-safe */
483 #if KMP_USE_MONITOR
484 /* control monitor thread creation */
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_BOOTSTRAP_LOCK_INIT(__kmp_tp_cached_lock);
490 
491 KMP_ALIGN(128)
492 KMP_LOCK_INIT(__kmp_global_lock); /* Control OS/global access */
493 KMP_ALIGN(128)
494 kmp_queuing_lock_t __kmp_dispatch_lock; /* Control dispatch access */
495 KMP_ALIGN(128)
496 KMP_LOCK_INIT(__kmp_debug_lock); /* Control I/O access for KMP_DEBUG */
497 #endif
498 
499 /* ----------------------------------------------- */
500 
501 #if KMP_HANDLE_SIGNALS
502 /* Signal handling is disabled by default, because it confuses users: In case of
503  sigsegv (or other trouble) in user code signal handler catches the signal,
504  which then "appears" in the monitor thread (when the monitor executes raise()
505  function). Users see signal in the monitor thread and blame OpenMP RTL.
506 
507  Grant said signal handling required on some older OSes (Irix?) supported by
508  KAI, because bad applications hung but not aborted. Currently it is not a
509  problem for Linux* OS, OS X* and Windows* OS.
510 
511  Grant: Found new hangs for EL4, EL5, and a Fedora Core machine. So I'm
512  putting the default back for now to see if that fixes hangs on those
513  machines.
514 
515  2010-04013 Lev: It was a bug in Fortran RTL. Fortran RTL prints a kind of
516  stack backtrace when program is aborting, but the code is not signal-safe.
517  When multiple signals raised at the same time (which occurs in dynamic
518  negative tests because all the worker threads detects the same error),
519  Fortran RTL may hang. The bug finally fixed in Fortran RTL library provided
520  by Steve R., and will be available soon. */
521 int __kmp_handle_signals = FALSE;
522 #endif
523 
524 #ifdef DEBUG_SUSPEND
525 int get_suspend_count_(void) {
526  int count = __kmp_suspend_count;
527  __kmp_suspend_count = 0;
528  return count;
529 }
530 void set_suspend_count_(int *value) { __kmp_suspend_count = *value; }
531 #endif
532 
533 // Symbols for MS mutual detection.
534 int _You_must_link_with_exactly_one_OpenMP_library = 1;
535 int _You_must_link_with_Intel_OpenMP_library = 1;
536 #if KMP_OS_WINDOWS && (KMP_VERSION_MAJOR > 4)
537 int _You_must_link_with_Microsoft_OpenMP_library = 1;
538 #endif
539 
540 kmp_target_offload_kind_t __kmp_target_offload = tgt_default;
541 
542 // OMP Pause Resources
543 kmp_pause_status_t __kmp_pause_status = kmp_not_paused;
544 
545 // end of file //
sched_type
Definition: kmp.h:351
@ kmp_sch_auto
Definition: kmp.h:358
@ kmp_sch_default
Definition: kmp.h:459
@ kmp_sch_guided_chunked
Definition: kmp.h:356