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 /* map OMP 3.0 schedule types with our internal schedule types */
223 enum sched_type __kmp_sch_map[kmp_sched_upper - kmp_sched_lower_ext +
224  kmp_sched_upper_std - kmp_sched_lower - 2] = {
225  kmp_sch_static_chunked, // ==> kmp_sched_static = 1
226  kmp_sch_dynamic_chunked, // ==> kmp_sched_dynamic = 2
227  kmp_sch_guided_chunked, // ==> kmp_sched_guided = 3
228  kmp_sch_auto, // ==> kmp_sched_auto = 4
229  kmp_sch_trapezoidal // ==> kmp_sched_trapezoidal = 101
230  // will likely not be used, introduced here just to debug the code
231  // of public intel extension schedules
232 };
233 
234 #if KMP_OS_LINUX
235 enum clock_function_type __kmp_clock_function;
236 int __kmp_clock_function_param;
237 #endif /* KMP_OS_LINUX */
238 
239 #if KMP_MIC_SUPPORTED
240 enum mic_type __kmp_mic_type = non_mic;
241 #endif
242 
243 #if KMP_AFFINITY_SUPPORTED
244 
245 KMPAffinity *__kmp_affinity_dispatch = NULL;
246 
247 #if KMP_USE_HWLOC
248 int __kmp_hwloc_error = FALSE;
249 hwloc_topology_t __kmp_hwloc_topology = NULL;
250 #endif
251 
252 #if KMP_OS_WINDOWS
253 #if KMP_GROUP_AFFINITY
254 int __kmp_num_proc_groups = 1;
255 #endif /* KMP_GROUP_AFFINITY */
256 kmp_GetActiveProcessorCount_t __kmp_GetActiveProcessorCount = NULL;
257 kmp_GetActiveProcessorGroupCount_t __kmp_GetActiveProcessorGroupCount = NULL;
258 kmp_GetThreadGroupAffinity_t __kmp_GetThreadGroupAffinity = NULL;
259 kmp_SetThreadGroupAffinity_t __kmp_SetThreadGroupAffinity = NULL;
260 #endif /* KMP_OS_WINDOWS */
261 
262 size_t __kmp_affin_mask_size = 0;
263 enum affinity_type __kmp_affinity_type = affinity_default;
264 kmp_hw_t __kmp_affinity_gran = KMP_HW_UNKNOWN;
265 int __kmp_affinity_gran_levels = -1;
266 int __kmp_affinity_dups = TRUE;
267 enum affinity_top_method __kmp_affinity_top_method =
268  affinity_top_method_default;
269 int __kmp_affinity_compact = 0;
270 int __kmp_affinity_offset = 0;
271 int __kmp_affinity_verbose = FALSE;
272 int __kmp_affinity_warnings = TRUE;
273 int __kmp_affinity_respect_mask = affinity_respect_mask_default;
274 char *__kmp_affinity_proclist = NULL;
275 kmp_affin_mask_t *__kmp_affinity_masks = NULL;
276 unsigned __kmp_affinity_num_masks = 0;
277 
278 char *__kmp_cpuinfo_file = NULL;
279 
280 #endif /* KMP_AFFINITY_SUPPORTED */
281 
282 kmp_nested_proc_bind_t __kmp_nested_proc_bind = {NULL, 0, 0};
283 kmp_proc_bind_t __kmp_teams_proc_bind = proc_bind_spread;
284 int __kmp_affinity_num_places = 0;
285 int __kmp_display_affinity = FALSE;
286 char *__kmp_affinity_format = NULL;
287 
288 kmp_int32 __kmp_default_device = 0;
289 
290 kmp_tasking_mode_t __kmp_tasking_mode = tskm_task_teams;
291 kmp_int32 __kmp_max_task_priority = 0;
292 kmp_uint64 __kmp_taskloop_min_tasks = 0;
293 
294 int __kmp_memkind_available = 0;
295 omp_allocator_handle_t const omp_null_allocator = NULL;
296 omp_allocator_handle_t const omp_default_mem_alloc =
297  (omp_allocator_handle_t const)1;
298 omp_allocator_handle_t const omp_large_cap_mem_alloc =
299  (omp_allocator_handle_t const)2;
300 omp_allocator_handle_t const omp_const_mem_alloc =
301  (omp_allocator_handle_t const)3;
302 omp_allocator_handle_t const omp_high_bw_mem_alloc =
303  (omp_allocator_handle_t const)4;
304 omp_allocator_handle_t const omp_low_lat_mem_alloc =
305  (omp_allocator_handle_t const)5;
306 omp_allocator_handle_t const omp_cgroup_mem_alloc =
307  (omp_allocator_handle_t const)6;
308 omp_allocator_handle_t const omp_pteam_mem_alloc =
309  (omp_allocator_handle_t const)7;
310 omp_allocator_handle_t const omp_thread_mem_alloc =
311  (omp_allocator_handle_t const)8;
312 // Preview of target memory support
313 omp_allocator_handle_t const llvm_omp_target_host_mem_alloc =
314  (omp_allocator_handle_t const)100;
315 omp_allocator_handle_t const llvm_omp_target_shared_mem_alloc =
316  (omp_allocator_handle_t const)101;
317 omp_allocator_handle_t const llvm_omp_target_device_mem_alloc =
318  (omp_allocator_handle_t const)102;
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 // Preview of target memory support
334 omp_memspace_handle_t const llvm_omp_target_host_mem_space =
335  (omp_memspace_handle_t const)100;
336 omp_memspace_handle_t const llvm_omp_target_shared_mem_space =
337  (omp_memspace_handle_t const)101;
338 omp_memspace_handle_t const llvm_omp_target_device_mem_space =
339  (omp_memspace_handle_t const)102;
340 
341 /* This check ensures that the compiler is passing the correct data type for the
342  flags formal parameter of the function kmpc_omp_task_alloc(). If the type is
343  not a 4-byte type, then give an error message about a non-positive length
344  array pointing here. If that happens, the kmp_tasking_flags_t structure must
345  be redefined to have exactly 32 bits. */
346 KMP_BUILD_ASSERT(sizeof(kmp_tasking_flags_t) == 4);
347 
348 int __kmp_task_stealing_constraint = 1; /* Constrain task stealing by default */
349 int __kmp_enable_task_throttling = 1;
350 
351 #ifdef DEBUG_SUSPEND
352 int __kmp_suspend_count = 0;
353 #endif
354 
355 int __kmp_settings = FALSE;
356 int __kmp_duplicate_library_ok = 0;
357 #if USE_ITT_BUILD
358 int __kmp_forkjoin_frames = 1;
359 int __kmp_forkjoin_frames_mode = 3;
360 #endif
361 PACKED_REDUCTION_METHOD_T __kmp_force_reduction_method =
362  reduction_method_not_defined;
363 int __kmp_determ_red = FALSE;
364 
365 #ifdef KMP_DEBUG
366 int kmp_a_debug = 0;
367 int kmp_b_debug = 0;
368 int kmp_c_debug = 0;
369 int kmp_d_debug = 0;
370 int kmp_e_debug = 0;
371 int kmp_f_debug = 0;
372 int kmp_diag = 0;
373 #endif
374 
375 /* For debug information logging using rotating buffer */
376 int __kmp_debug_buf =
377  FALSE; /* TRUE means use buffer, FALSE means print to stderr */
378 int __kmp_debug_buf_lines =
379  KMP_DEBUG_BUF_LINES_INIT; /* Lines of debug stored in buffer */
380 int __kmp_debug_buf_chars =
381  KMP_DEBUG_BUF_CHARS_INIT; /* Characters allowed per line in buffer */
382 int __kmp_debug_buf_atomic =
383  FALSE; /* TRUE means use atomic update of buffer entry pointer */
384 
385 char *__kmp_debug_buffer = NULL; /* Debug buffer itself */
386 std::atomic<int> __kmp_debug_count =
387  ATOMIC_VAR_INIT(0); /* number of lines printed in buffer so far */
388 int __kmp_debug_buf_warn_chars =
389  0; /* Keep track of char increase recommended in warnings */
390 /* end rotating debug buffer */
391 
392 #ifdef KMP_DEBUG
393 int __kmp_par_range; /* +1 => only go par for constructs in range */
394 /* -1 => only go par for constructs outside range */
395 char __kmp_par_range_routine[KMP_PAR_RANGE_ROUTINE_LEN] = {'\0'};
396 char __kmp_par_range_filename[KMP_PAR_RANGE_FILENAME_LEN] = {'\0'};
397 int __kmp_par_range_lb = 0;
398 int __kmp_par_range_ub = INT_MAX;
399 #endif /* KMP_DEBUG */
400 
401 /* For printing out dynamic storage map for threads and teams */
402 int __kmp_storage_map =
403  FALSE; /* True means print storage map for threads and teams */
404 int __kmp_storage_map_verbose =
405  FALSE; /* True means storage map includes placement info */
406 int __kmp_storage_map_verbose_specified = FALSE;
407 /* Initialize the library data structures when we fork a child process, defaults
408  * to TRUE */
409 int __kmp_need_register_atfork =
410  TRUE; /* At initialization, call pthread_atfork to install fork handler */
411 int __kmp_need_register_atfork_specified = TRUE;
412 
413 int __kmp_env_stksize = FALSE; /* KMP_STACKSIZE specified? */
414 int __kmp_env_blocktime = FALSE; /* KMP_BLOCKTIME specified? */
415 int __kmp_env_checks = FALSE; /* KMP_CHECKS specified? */
416 int __kmp_env_consistency_check = FALSE; /* KMP_CONSISTENCY_CHECK specified? */
417 
418 // From KMP_USE_YIELD:
419 // 0 = never yield;
420 // 1 = always yield (default);
421 // 2 = yield only if oversubscribed
422 kmp_int32 __kmp_use_yield = 1;
423 // This will be 1 if KMP_USE_YIELD environment variable was set explicitly
424 kmp_int32 __kmp_use_yield_exp_set = 0;
425 
426 kmp_uint32 __kmp_yield_init = KMP_INIT_WAIT;
427 kmp_uint32 __kmp_yield_next = KMP_NEXT_WAIT;
428 
429 /* ------------------------------------------------------ */
430 /* STATE mostly syncronized with global lock */
431 /* data written to rarely by primary threads, read often by workers */
432 /* TODO: None of this global padding stuff works consistently because the order
433  of declaration is not necessarily correlated to storage order. To fix this,
434  all the important globals must be put in a big structure instead. */
435 KMP_ALIGN_CACHE
436 kmp_info_t **__kmp_threads = NULL;
437 kmp_root_t **__kmp_root = NULL;
438 
439 /* data read/written to often by primary threads */
440 KMP_ALIGN_CACHE
441 volatile int __kmp_nth = 0;
442 volatile int __kmp_all_nth = 0;
443 volatile kmp_info_t *__kmp_thread_pool = NULL;
444 volatile kmp_team_t *__kmp_team_pool = NULL;
445 
446 KMP_ALIGN_CACHE
447 std::atomic<int> __kmp_thread_pool_active_nth = ATOMIC_VAR_INIT(0);
448 
449 /* -------------------------------------------------
450  * GLOBAL/ROOT STATE */
451 KMP_ALIGN_CACHE
452 kmp_global_t __kmp_global;
453 
454 /* ----------------------------------------------- */
455 /* GLOBAL SYNCHRONIZATION LOCKS */
456 /* TODO verify the need for these locks and if they need to be global */
457 
458 #if KMP_USE_INTERNODE_ALIGNMENT
459 /* Multinode systems have larger cache line granularity which can cause
460  * false sharing if the alignment is not large enough for these locks */
461 KMP_ALIGN_CACHE_INTERNODE
462 
463 KMP_BOOTSTRAP_LOCK_INIT(__kmp_initz_lock); /* Control initializations */
464 KMP_ALIGN_CACHE_INTERNODE
465 KMP_BOOTSTRAP_LOCK_INIT(__kmp_forkjoin_lock); /* control fork/join access */
466 KMP_ALIGN_CACHE_INTERNODE
467 KMP_BOOTSTRAP_LOCK_INIT(__kmp_exit_lock); /* exit() is not always thread-safe */
468 #if KMP_USE_MONITOR
469 /* control monitor thread creation */
470 KMP_ALIGN_CACHE_INTERNODE
471 KMP_BOOTSTRAP_LOCK_INIT(__kmp_monitor_lock);
472 #endif
473 /* used for the hack to allow threadprivate cache and __kmp_threads expansion
474  to co-exist */
475 KMP_ALIGN_CACHE_INTERNODE
476 KMP_BOOTSTRAP_LOCK_INIT(__kmp_tp_cached_lock);
477 
478 KMP_ALIGN_CACHE_INTERNODE
479 KMP_LOCK_INIT(__kmp_global_lock); /* Control OS/global access */
480 KMP_ALIGN_CACHE_INTERNODE
481 kmp_queuing_lock_t __kmp_dispatch_lock; /* Control dispatch access */
482 KMP_ALIGN_CACHE_INTERNODE
483 KMP_LOCK_INIT(__kmp_debug_lock); /* Control I/O access for KMP_DEBUG */
484 #else
485 KMP_ALIGN_CACHE
486 
487 KMP_BOOTSTRAP_LOCK_INIT(__kmp_initz_lock); /* Control initializations */
488 KMP_BOOTSTRAP_LOCK_INIT(__kmp_forkjoin_lock); /* control fork/join access */
489 KMP_BOOTSTRAP_LOCK_INIT(__kmp_exit_lock); /* exit() is not always thread-safe */
490 #if KMP_USE_MONITOR
491 /* control monitor thread creation */
492 KMP_BOOTSTRAP_LOCK_INIT(__kmp_monitor_lock);
493 #endif
494 /* used for the hack to allow threadprivate cache and __kmp_threads expansion
495  to co-exist */
496 KMP_BOOTSTRAP_LOCK_INIT(__kmp_tp_cached_lock);
497 
498 KMP_ALIGN(128)
499 KMP_LOCK_INIT(__kmp_global_lock); /* Control OS/global access */
500 KMP_ALIGN(128)
501 kmp_queuing_lock_t __kmp_dispatch_lock; /* Control dispatch access */
502 KMP_ALIGN(128)
503 KMP_LOCK_INIT(__kmp_debug_lock); /* Control I/O access for KMP_DEBUG */
504 #endif
505 
506 /* ----------------------------------------------- */
507 
508 #if KMP_HANDLE_SIGNALS
509 /* Signal handling is disabled by default, because it confuses users: In case of
510  sigsegv (or other trouble) in user code signal handler catches the signal,
511  which then "appears" in the monitor thread (when the monitor executes raise()
512  function). Users see signal in the monitor thread and blame OpenMP RTL.
513 
514  Grant said signal handling required on some older OSes (Irix?) supported by
515  KAI, because bad applications hung but not aborted. Currently it is not a
516  problem for Linux* OS, OS X* and Windows* OS.
517 
518  Grant: Found new hangs for EL4, EL5, and a Fedora Core machine. So I'm
519  putting the default back for now to see if that fixes hangs on those
520  machines.
521 
522  2010-04013 Lev: It was a bug in Fortran RTL. Fortran RTL prints a kind of
523  stack backtrace when program is aborting, but the code is not signal-safe.
524  When multiple signals raised at the same time (which occurs in dynamic
525  negative tests because all the worker threads detects the same error),
526  Fortran RTL may hang. The bug finally fixed in Fortran RTL library provided
527  by Steve R., and will be available soon. */
528 int __kmp_handle_signals = FALSE;
529 #endif
530 
531 #ifdef DEBUG_SUSPEND
532 int get_suspend_count_(void) {
533  int count = __kmp_suspend_count;
534  __kmp_suspend_count = 0;
535  return count;
536 }
537 void set_suspend_count_(int *value) { __kmp_suspend_count = *value; }
538 #endif
539 
540 // Symbols for MS mutual detection.
541 int _You_must_link_with_exactly_one_OpenMP_library = 1;
542 int _You_must_link_with_Intel_OpenMP_library = 1;
543 #if KMP_OS_WINDOWS && (KMP_VERSION_MAJOR > 4)
544 int _You_must_link_with_Microsoft_OpenMP_library = 1;
545 #endif
546 
547 kmp_target_offload_kind_t __kmp_target_offload = tgt_default;
548 
549 // OMP Pause Resources
550 kmp_pause_status_t __kmp_pause_status = kmp_not_paused;
551 
552 // Nesting mode
553 int __kmp_nesting_mode = 0;
554 int __kmp_nesting_mode_nlevels = 1;
555 int *__kmp_nesting_nth_level;
556 
557 // end of file //
kmp_sch_default
@ kmp_sch_default
Definition: kmp.h:465
kmp_sch_guided_chunked
@ kmp_sch_guided_chunked
Definition: kmp.h:362
sched_type
sched_type
Definition: kmp.h:357
kmp_sch_auto
@ kmp_sch_auto
Definition: kmp.h:364