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 #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_force_monotonic = 0;
170 int __kmp_abort_delay = 0;
171 #if KMP_OS_LINUX && defined(KMP_TDATA_GTID)
172 int __kmp_gtid_mode = 3; /* use __declspec(thread) TLS to store gtid */
173 int __kmp_adjust_gtid_mode = FALSE;
174 #elif KMP_OS_WINDOWS
175 int __kmp_gtid_mode = 2; /* use TLS functions to store gtid */
176 int __kmp_adjust_gtid_mode = FALSE;
177 #else
178 int __kmp_gtid_mode = 0; /* select method to get gtid based on #threads */
179 int __kmp_adjust_gtid_mode = TRUE;
180 #endif /* KMP_OS_LINUX && defined(KMP_TDATA_GTID) */
181 #ifdef KMP_TDATA_GTID
182 KMP_THREAD_LOCAL int __kmp_gtid = KMP_GTID_DNE;
183 #endif /* KMP_TDATA_GTID */
184 int __kmp_tls_gtid_min = INT_MAX;
185 int __kmp_foreign_tp = TRUE;
186 #if KMP_ARCH_X86 || KMP_ARCH_X86_64
187 int __kmp_inherit_fp_control = TRUE;
188 kmp_int16 __kmp_init_x87_fpu_control_word = 0;
189 kmp_uint32 __kmp_init_mxcsr = 0;
190 #endif /* KMP_ARCH_X86 || KMP_ARCH_X86_64 */
191 
192 #ifdef USE_LOAD_BALANCE
193 double __kmp_load_balance_interval = 1.0;
194 #endif /* USE_LOAD_BALANCE */
195 
196 kmp_nested_nthreads_t __kmp_nested_nth = {NULL, 0, 0};
197 
198 #if KMP_USE_ADAPTIVE_LOCKS
199 
200 kmp_adaptive_backoff_params_t __kmp_adaptive_backoff_params = {
201  1, 1024}; // TODO: tune it!
202 
203 #if KMP_DEBUG_ADAPTIVE_LOCKS
204 const char *__kmp_speculative_statsfile = "-";
205 #endif
206 
207 #endif // KMP_USE_ADAPTIVE_LOCKS
208 
209 int __kmp_display_env = FALSE;
210 int __kmp_display_env_verbose = FALSE;
211 int __kmp_omp_cancellation = FALSE;
212 int __kmp_nteams = 0;
213 int __kmp_teams_thread_limit = 0;
214 
215 #if KMP_HAVE_MWAIT || KMP_HAVE_UMWAIT
216 int __kmp_user_level_mwait = FALSE;
217 int __kmp_umwait_enabled = FALSE;
218 int __kmp_mwait_enabled = FALSE;
219 int __kmp_mwait_hints = 0;
220 #endif
221 
222 #if KMP_HAVE_UMWAIT
223 int __kmp_waitpkg_enabled = 0;
224 int __kmp_tpause_state = 0;
225 int __kmp_tpause_hint = 1;
226 int __kmp_tpause_enabled = 0;
227 #endif
228 
229 /* map OMP 3.0 schedule types with our internal schedule types */
230 enum sched_type __kmp_sch_map[kmp_sched_upper - kmp_sched_lower_ext +
231  kmp_sched_upper_std - kmp_sched_lower - 2] = {
232  kmp_sch_static_chunked, // ==> kmp_sched_static = 1
233  kmp_sch_dynamic_chunked, // ==> kmp_sched_dynamic = 2
234  kmp_sch_guided_chunked, // ==> kmp_sched_guided = 3
235  kmp_sch_auto, // ==> kmp_sched_auto = 4
236  kmp_sch_trapezoidal // ==> kmp_sched_trapezoidal = 101
237  // will likely not be used, introduced here just to debug the code
238  // of public intel extension schedules
239 };
240 
241 #if KMP_OS_LINUX
242 enum clock_function_type __kmp_clock_function;
243 int __kmp_clock_function_param;
244 #endif /* KMP_OS_LINUX */
245 
246 #if KMP_MIC_SUPPORTED
247 enum mic_type __kmp_mic_type = non_mic;
248 #endif
249 
250 #if KMP_AFFINITY_SUPPORTED
251 
252 KMPAffinity *__kmp_affinity_dispatch = NULL;
253 
254 #if KMP_USE_HWLOC
255 int __kmp_hwloc_error = FALSE;
256 hwloc_topology_t __kmp_hwloc_topology = NULL;
257 #endif
258 
259 #if KMP_OS_WINDOWS
260 #if KMP_GROUP_AFFINITY
261 int __kmp_num_proc_groups = 1;
262 #endif /* KMP_GROUP_AFFINITY */
263 kmp_GetActiveProcessorCount_t __kmp_GetActiveProcessorCount = NULL;
264 kmp_GetActiveProcessorGroupCount_t __kmp_GetActiveProcessorGroupCount = NULL;
265 kmp_GetThreadGroupAffinity_t __kmp_GetThreadGroupAffinity = NULL;
266 kmp_SetThreadGroupAffinity_t __kmp_SetThreadGroupAffinity = NULL;
267 #endif /* KMP_OS_WINDOWS */
268 
269 size_t __kmp_affin_mask_size = 0;
270 enum affinity_type __kmp_affinity_type = affinity_default;
271 kmp_hw_t __kmp_affinity_gran = KMP_HW_UNKNOWN;
272 int __kmp_affinity_gran_levels = -1;
273 int __kmp_affinity_dups = TRUE;
274 enum affinity_top_method __kmp_affinity_top_method =
275  affinity_top_method_default;
276 int __kmp_affinity_compact = 0;
277 int __kmp_affinity_offset = 0;
278 int __kmp_affinity_verbose = FALSE;
279 int __kmp_affinity_warnings = TRUE;
280 int __kmp_affinity_respect_mask = affinity_respect_mask_default;
281 char *__kmp_affinity_proclist = NULL;
282 kmp_affin_mask_t *__kmp_affinity_masks = NULL;
283 unsigned __kmp_affinity_num_masks = 0;
284 
285 char *__kmp_cpuinfo_file = NULL;
286 
287 #endif /* KMP_AFFINITY_SUPPORTED */
288 
289 kmp_nested_proc_bind_t __kmp_nested_proc_bind = {NULL, 0, 0};
290 kmp_proc_bind_t __kmp_teams_proc_bind = proc_bind_spread;
291 int __kmp_affinity_num_places = 0;
292 int __kmp_display_affinity = FALSE;
293 char *__kmp_affinity_format = NULL;
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 llvm_omp_target_host_mem_alloc =
320  (omp_allocator_handle_t const)100;
321 omp_allocator_handle_t const llvm_omp_target_shared_mem_alloc =
322  (omp_allocator_handle_t const)101;
323 omp_allocator_handle_t const llvm_omp_target_device_mem_alloc =
324  (omp_allocator_handle_t const)102;
325 omp_allocator_handle_t const kmp_max_mem_alloc =
326  (omp_allocator_handle_t const)1024;
327 omp_allocator_handle_t __kmp_def_allocator = omp_default_mem_alloc;
328 
329 omp_memspace_handle_t const omp_default_mem_space =
330  (omp_memspace_handle_t const)0;
331 omp_memspace_handle_t const omp_large_cap_mem_space =
332  (omp_memspace_handle_t const)1;
333 omp_memspace_handle_t const omp_const_mem_space =
334  (omp_memspace_handle_t const)2;
335 omp_memspace_handle_t const omp_high_bw_mem_space =
336  (omp_memspace_handle_t const)3;
337 omp_memspace_handle_t const omp_low_lat_mem_space =
338  (omp_memspace_handle_t const)4;
339 omp_memspace_handle_t const llvm_omp_target_host_mem_space =
340  (omp_memspace_handle_t const)100;
341 omp_memspace_handle_t const llvm_omp_target_shared_mem_space =
342  (omp_memspace_handle_t const)101;
343 omp_memspace_handle_t const llvm_omp_target_device_mem_space =
344  (omp_memspace_handle_t const)102;
345 
346 /* This check ensures that the compiler is passing the correct data type for the
347  flags formal parameter of the function kmpc_omp_task_alloc(). If the type is
348  not a 4-byte type, then give an error message about a non-positive length
349  array pointing here. If that happens, the kmp_tasking_flags_t structure must
350  be redefined to have exactly 32 bits. */
351 KMP_BUILD_ASSERT(sizeof(kmp_tasking_flags_t) == 4);
352 
353 int __kmp_task_stealing_constraint = 1; /* Constrain task stealing by default */
354 int __kmp_enable_task_throttling = 1;
355 
356 #ifdef DEBUG_SUSPEND
357 int __kmp_suspend_count = 0;
358 #endif
359 
360 int __kmp_settings = FALSE;
361 int __kmp_duplicate_library_ok = 0;
362 #if USE_ITT_BUILD
363 int __kmp_forkjoin_frames = 1;
364 int __kmp_forkjoin_frames_mode = 3;
365 #endif
366 PACKED_REDUCTION_METHOD_T __kmp_force_reduction_method =
367  reduction_method_not_defined;
368 int __kmp_determ_red = FALSE;
369 
370 #ifdef KMP_DEBUG
371 int kmp_a_debug = 0;
372 int kmp_b_debug = 0;
373 int kmp_c_debug = 0;
374 int kmp_d_debug = 0;
375 int kmp_e_debug = 0;
376 int kmp_f_debug = 0;
377 int kmp_diag = 0;
378 #endif
379 
380 /* For debug information logging using rotating buffer */
381 int __kmp_debug_buf =
382  FALSE; /* TRUE means use buffer, FALSE means print to stderr */
383 int __kmp_debug_buf_lines =
384  KMP_DEBUG_BUF_LINES_INIT; /* Lines of debug stored in buffer */
385 int __kmp_debug_buf_chars =
386  KMP_DEBUG_BUF_CHARS_INIT; /* Characters allowed per line in buffer */
387 int __kmp_debug_buf_atomic =
388  FALSE; /* TRUE means use atomic update of buffer entry pointer */
389 
390 char *__kmp_debug_buffer = NULL; /* Debug buffer itself */
391 std::atomic<int> __kmp_debug_count =
392  ATOMIC_VAR_INIT(0); /* number of lines printed in buffer so far */
393 int __kmp_debug_buf_warn_chars =
394  0; /* Keep track of char increase recommended in warnings */
395 /* end rotating debug buffer */
396 
397 #ifdef KMP_DEBUG
398 int __kmp_par_range; /* +1 => only go par for constructs in range */
399 /* -1 => only go par for constructs outside range */
400 char __kmp_par_range_routine[KMP_PAR_RANGE_ROUTINE_LEN] = {'\0'};
401 char __kmp_par_range_filename[KMP_PAR_RANGE_FILENAME_LEN] = {'\0'};
402 int __kmp_par_range_lb = 0;
403 int __kmp_par_range_ub = INT_MAX;
404 #endif /* KMP_DEBUG */
405 
406 /* For printing out dynamic storage map for threads and teams */
407 int __kmp_storage_map =
408  FALSE; /* True means print storage map for threads and teams */
409 int __kmp_storage_map_verbose =
410  FALSE; /* True means storage map includes placement info */
411 int __kmp_storage_map_verbose_specified = FALSE;
412 /* Initialize the library data structures when we fork a child process, defaults
413  * to TRUE */
414 int __kmp_need_register_atfork =
415  TRUE; /* At initialization, call pthread_atfork to install fork handler */
416 int __kmp_need_register_atfork_specified = TRUE;
417 
418 int __kmp_env_stksize = FALSE; /* KMP_STACKSIZE specified? */
419 int __kmp_env_blocktime = FALSE; /* KMP_BLOCKTIME specified? */
420 int __kmp_env_checks = FALSE; /* KMP_CHECKS specified? */
421 int __kmp_env_consistency_check = FALSE; /* KMP_CONSISTENCY_CHECK specified? */
422 
423 // From KMP_USE_YIELD:
424 // 0 = never yield;
425 // 1 = always yield (default);
426 // 2 = yield only if oversubscribed
427 kmp_int32 __kmp_use_yield = 1;
428 // This will be 1 if KMP_USE_YIELD environment variable was set explicitly
429 kmp_int32 __kmp_use_yield_exp_set = 0;
430 
431 kmp_uint32 __kmp_yield_init = KMP_INIT_WAIT;
432 kmp_uint32 __kmp_yield_next = KMP_NEXT_WAIT;
433 kmp_uint64 __kmp_pause_init = 1; // for tpause
434 
435 /* ------------------------------------------------------ */
436 /* STATE mostly syncronized with global lock */
437 /* data written to rarely by primary threads, read often by workers */
438 /* TODO: None of this global padding stuff works consistently because the order
439  of declaration is not necessarily correlated to storage order. To fix this,
440  all the important globals must be put in a big structure instead. */
441 KMP_ALIGN_CACHE
442 kmp_info_t **__kmp_threads = NULL;
443 kmp_root_t **__kmp_root = NULL;
444 
445 /* data read/written to often by primary threads */
446 KMP_ALIGN_CACHE
447 volatile int __kmp_nth = 0;
448 volatile int __kmp_all_nth = 0;
449 volatile kmp_info_t *__kmp_thread_pool = NULL;
450 volatile kmp_team_t *__kmp_team_pool = NULL;
451 
452 KMP_ALIGN_CACHE
453 std::atomic<int> __kmp_thread_pool_active_nth = ATOMIC_VAR_INIT(0);
454 
455 /* -------------------------------------------------
456  * GLOBAL/ROOT STATE */
457 KMP_ALIGN_CACHE
458 kmp_global_t __kmp_global;
459 
460 /* ----------------------------------------------- */
461 /* GLOBAL SYNCHRONIZATION LOCKS */
462 /* TODO verify the need for these locks and if they need to be global */
463 
464 #if KMP_USE_INTERNODE_ALIGNMENT
465 /* Multinode systems have larger cache line granularity which can cause
466  * false sharing if the alignment is not large enough for these locks */
467 KMP_ALIGN_CACHE_INTERNODE
468 
469 KMP_BOOTSTRAP_LOCK_INIT(__kmp_initz_lock); /* Control initializations */
470 KMP_ALIGN_CACHE_INTERNODE
471 KMP_BOOTSTRAP_LOCK_INIT(__kmp_forkjoin_lock); /* control fork/join access */
472 KMP_ALIGN_CACHE_INTERNODE
473 KMP_BOOTSTRAP_LOCK_INIT(__kmp_exit_lock); /* exit() is not always thread-safe */
474 #if KMP_USE_MONITOR
475 /* control monitor thread creation */
476 KMP_ALIGN_CACHE_INTERNODE
477 KMP_BOOTSTRAP_LOCK_INIT(__kmp_monitor_lock);
478 #endif
479 /* used for the hack to allow threadprivate cache and __kmp_threads expansion
480  to co-exist */
481 KMP_ALIGN_CACHE_INTERNODE
482 KMP_BOOTSTRAP_LOCK_INIT(__kmp_tp_cached_lock);
483 
484 KMP_ALIGN_CACHE_INTERNODE
485 KMP_LOCK_INIT(__kmp_global_lock); /* Control OS/global access */
486 KMP_ALIGN_CACHE_INTERNODE
487 kmp_queuing_lock_t __kmp_dispatch_lock; /* Control dispatch access */
488 KMP_ALIGN_CACHE_INTERNODE
489 KMP_LOCK_INIT(__kmp_debug_lock); /* Control I/O access for KMP_DEBUG */
490 #else
491 KMP_ALIGN_CACHE
492 
493 KMP_BOOTSTRAP_LOCK_INIT(__kmp_initz_lock); /* Control initializations */
494 KMP_BOOTSTRAP_LOCK_INIT(__kmp_forkjoin_lock); /* control fork/join access */
495 KMP_BOOTSTRAP_LOCK_INIT(__kmp_exit_lock); /* exit() is not always thread-safe */
496 #if KMP_USE_MONITOR
497 /* control monitor thread creation */
498 KMP_BOOTSTRAP_LOCK_INIT(__kmp_monitor_lock);
499 #endif
500 /* used for the hack to allow threadprivate cache and __kmp_threads expansion
501  to co-exist */
502 KMP_BOOTSTRAP_LOCK_INIT(__kmp_tp_cached_lock);
503 
504 KMP_ALIGN(128)
505 KMP_LOCK_INIT(__kmp_global_lock); /* Control OS/global access */
506 KMP_ALIGN(128)
507 kmp_queuing_lock_t __kmp_dispatch_lock; /* Control dispatch access */
508 KMP_ALIGN(128)
509 KMP_LOCK_INIT(__kmp_debug_lock); /* Control I/O access for KMP_DEBUG */
510 #endif
511 
512 /* ----------------------------------------------- */
513 
514 #if KMP_HANDLE_SIGNALS
515 /* Signal handling is disabled by default, because it confuses users: In case of
516  sigsegv (or other trouble) in user code signal handler catches the signal,
517  which then "appears" in the monitor thread (when the monitor executes raise()
518  function). Users see signal in the monitor thread and blame OpenMP RTL.
519 
520  Grant said signal handling required on some older OSes (Irix?) supported by
521  KAI, because bad applications hung but not aborted. Currently it is not a
522  problem for Linux* OS, OS X* and Windows* OS.
523 
524  Grant: Found new hangs for EL4, EL5, and a Fedora Core machine. So I'm
525  putting the default back for now to see if that fixes hangs on those
526  machines.
527 
528  2010-04013 Lev: It was a bug in Fortran RTL. Fortran RTL prints a kind of
529  stack backtrace when program is aborting, but the code is not signal-safe.
530  When multiple signals raised at the same time (which occurs in dynamic
531  negative tests because all the worker threads detects the same error),
532  Fortran RTL may hang. The bug finally fixed in Fortran RTL library provided
533  by Steve R., and will be available soon. */
534 int __kmp_handle_signals = FALSE;
535 #endif
536 
537 #ifdef DEBUG_SUSPEND
538 int get_suspend_count_(void) {
539  int count = __kmp_suspend_count;
540  __kmp_suspend_count = 0;
541  return count;
542 }
543 void set_suspend_count_(int *value) { __kmp_suspend_count = *value; }
544 #endif
545 
546 // Symbols for MS mutual detection.
547 int _You_must_link_with_exactly_one_OpenMP_library = 1;
548 int _You_must_link_with_Intel_OpenMP_library = 1;
549 #if KMP_OS_WINDOWS && (KMP_VERSION_MAJOR > 4)
550 int _You_must_link_with_Microsoft_OpenMP_library = 1;
551 #endif
552 
553 kmp_target_offload_kind_t __kmp_target_offload = tgt_default;
554 
555 // OMP Pause Resources
556 kmp_pause_status_t __kmp_pause_status = kmp_not_paused;
557 
558 // Nesting mode
559 int __kmp_nesting_mode = 0;
560 int __kmp_nesting_mode_nlevels = 1;
561 int *__kmp_nesting_nth_level;
562 
563 // 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