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_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 int __kmp_numa_detected = FALSE;
251 int __kmp_tile_depth = 0;
252 #endif
253 
254 #if KMP_OS_WINDOWS
255 #if KMP_GROUP_AFFINITY
256 int __kmp_num_proc_groups = 1;
257 #endif /* KMP_GROUP_AFFINITY */
258 kmp_GetActiveProcessorCount_t __kmp_GetActiveProcessorCount = NULL;
259 kmp_GetActiveProcessorGroupCount_t __kmp_GetActiveProcessorGroupCount = NULL;
260 kmp_GetThreadGroupAffinity_t __kmp_GetThreadGroupAffinity = NULL;
261 kmp_SetThreadGroupAffinity_t __kmp_SetThreadGroupAffinity = NULL;
262 #endif /* KMP_OS_WINDOWS */
263 
264 size_t __kmp_affin_mask_size = 0;
265 enum affinity_type __kmp_affinity_type = affinity_default;
266 enum affinity_gran __kmp_affinity_gran = affinity_gran_default;
267 int __kmp_affinity_gran_levels = -1;
268 int __kmp_affinity_dups = TRUE;
269 enum affinity_top_method __kmp_affinity_top_method =
270  affinity_top_method_default;
271 int __kmp_affinity_compact = 0;
272 int __kmp_affinity_offset = 0;
273 int __kmp_affinity_verbose = FALSE;
274 int __kmp_affinity_warnings = TRUE;
275 int __kmp_affinity_respect_mask = affinity_respect_mask_default;
276 char *__kmp_affinity_proclist = NULL;
277 kmp_affin_mask_t *__kmp_affinity_masks = NULL;
278 unsigned __kmp_affinity_num_masks = 0;
279 
280 char *__kmp_cpuinfo_file = NULL;
281 
282 #endif /* KMP_AFFINITY_SUPPORTED */
283 
284 kmp_nested_proc_bind_t __kmp_nested_proc_bind = {NULL, 0, 0};
285 int __kmp_affinity_num_places = 0;
286 int __kmp_display_affinity = FALSE;
287 char *__kmp_affinity_format = NULL;
288 
289 kmp_hws_item_t __kmp_hws_socket = {0, 0};
290 kmp_hws_item_t __kmp_hws_die = {0, 0};
291 kmp_hws_item_t __kmp_hws_node = {0, 0};
292 kmp_hws_item_t __kmp_hws_tile = {0, 0};
293 kmp_hws_item_t __kmp_hws_core = {0, 0};
294 kmp_hws_item_t __kmp_hws_proc = {0, 0};
295 int __kmp_hws_requested = 0;
296 int __kmp_hws_abs_flag = 0; // absolute or per-item number requested
297 
298 kmp_int32 __kmp_default_device = 0;
299 
300 kmp_tasking_mode_t __kmp_tasking_mode = tskm_task_teams;
301 kmp_int32 __kmp_max_task_priority = 0;
302 kmp_uint64 __kmp_taskloop_min_tasks = 0;
303 
304 int __kmp_memkind_available = 0;
305 omp_allocator_handle_t const omp_null_allocator = NULL;
306 omp_allocator_handle_t const omp_default_mem_alloc =
307  (omp_allocator_handle_t const)1;
308 omp_allocator_handle_t const omp_large_cap_mem_alloc =
309  (omp_allocator_handle_t const)2;
310 omp_allocator_handle_t const omp_const_mem_alloc =
311  (omp_allocator_handle_t const)3;
312 omp_allocator_handle_t const omp_high_bw_mem_alloc =
313  (omp_allocator_handle_t const)4;
314 omp_allocator_handle_t const omp_low_lat_mem_alloc =
315  (omp_allocator_handle_t const)5;
316 omp_allocator_handle_t const omp_cgroup_mem_alloc =
317  (omp_allocator_handle_t const)6;
318 omp_allocator_handle_t const omp_pteam_mem_alloc =
319  (omp_allocator_handle_t const)7;
320 omp_allocator_handle_t const omp_thread_mem_alloc =
321  (omp_allocator_handle_t const)8;
322 // Preview of target memory support
323 omp_allocator_handle_t const llvm_omp_target_host_mem_alloc =
324  (omp_allocator_handle_t const)100;
325 omp_allocator_handle_t const llvm_omp_target_shared_mem_alloc =
326  (omp_allocator_handle_t const)101;
327 omp_allocator_handle_t const llvm_omp_target_device_mem_alloc =
328  (omp_allocator_handle_t const)102;
329 omp_allocator_handle_t const kmp_max_mem_alloc =
330  (omp_allocator_handle_t const)1024;
331 omp_allocator_handle_t __kmp_def_allocator = omp_default_mem_alloc;
332 
333 omp_memspace_handle_t const omp_default_mem_space =
334  (omp_memspace_handle_t const)0;
335 omp_memspace_handle_t const omp_large_cap_mem_space =
336  (omp_memspace_handle_t const)1;
337 omp_memspace_handle_t const omp_const_mem_space =
338  (omp_memspace_handle_t const)2;
339 omp_memspace_handle_t const omp_high_bw_mem_space =
340  (omp_memspace_handle_t const)3;
341 omp_memspace_handle_t const omp_low_lat_mem_space =
342  (omp_memspace_handle_t const)4;
343 // Preview of target memory support
344 omp_memspace_handle_t const llvm_omp_target_host_mem_space =
345  (omp_memspace_handle_t const)100;
346 omp_memspace_handle_t const llvm_omp_target_shared_mem_space =
347  (omp_memspace_handle_t const)101;
348 omp_memspace_handle_t const llvm_omp_target_device_mem_space =
349  (omp_memspace_handle_t const)102;
350 
351 /* This check ensures that the compiler is passing the correct data type for the
352  flags formal parameter of the function kmpc_omp_task_alloc(). If the type is
353  not a 4-byte type, then give an error message about a non-positive length
354  array pointing here. If that happens, the kmp_tasking_flags_t structure must
355  be redefined to have exactly 32 bits. */
356 KMP_BUILD_ASSERT(sizeof(kmp_tasking_flags_t) == 4);
357 
358 int __kmp_task_stealing_constraint = 1; /* Constrain task stealing by default */
359 int __kmp_enable_task_throttling = 1;
360 
361 #ifdef DEBUG_SUSPEND
362 int __kmp_suspend_count = 0;
363 #endif
364 
365 int __kmp_settings = FALSE;
366 int __kmp_duplicate_library_ok = 0;
367 #if USE_ITT_BUILD
368 int __kmp_forkjoin_frames = 1;
369 int __kmp_forkjoin_frames_mode = 3;
370 #endif
371 PACKED_REDUCTION_METHOD_T __kmp_force_reduction_method =
372  reduction_method_not_defined;
373 int __kmp_determ_red = FALSE;
374 
375 #ifdef KMP_DEBUG
376 int kmp_a_debug = 0;
377 int kmp_b_debug = 0;
378 int kmp_c_debug = 0;
379 int kmp_d_debug = 0;
380 int kmp_e_debug = 0;
381 int kmp_f_debug = 0;
382 int kmp_diag = 0;
383 #endif
384 
385 /* For debug information logging using rotating buffer */
386 int __kmp_debug_buf =
387  FALSE; /* TRUE means use buffer, FALSE means print to stderr */
388 int __kmp_debug_buf_lines =
389  KMP_DEBUG_BUF_LINES_INIT; /* Lines of debug stored in buffer */
390 int __kmp_debug_buf_chars =
391  KMP_DEBUG_BUF_CHARS_INIT; /* Characters allowed per line in buffer */
392 int __kmp_debug_buf_atomic =
393  FALSE; /* TRUE means use atomic update of buffer entry pointer */
394 
395 char *__kmp_debug_buffer = NULL; /* Debug buffer itself */
396 std::atomic<int> __kmp_debug_count =
397  ATOMIC_VAR_INIT(0); /* number of lines printed in buffer so far */
398 int __kmp_debug_buf_warn_chars =
399  0; /* Keep track of char increase recommended in warnings */
400 /* end rotating debug buffer */
401 
402 #ifdef KMP_DEBUG
403 int __kmp_par_range; /* +1 => only go par for constructs in range */
404 /* -1 => only go par for constructs outside range */
405 char __kmp_par_range_routine[KMP_PAR_RANGE_ROUTINE_LEN] = {'\0'};
406 char __kmp_par_range_filename[KMP_PAR_RANGE_FILENAME_LEN] = {'\0'};
407 int __kmp_par_range_lb = 0;
408 int __kmp_par_range_ub = INT_MAX;
409 #endif /* KMP_DEBUG */
410 
411 /* For printing out dynamic storage map for threads and teams */
412 int __kmp_storage_map =
413  FALSE; /* True means print storage map for threads and teams */
414 int __kmp_storage_map_verbose =
415  FALSE; /* True means storage map includes placement info */
416 int __kmp_storage_map_verbose_specified = FALSE;
417 /* Initialize the library data structures when we fork a child process, defaults
418  * to TRUE */
419 int __kmp_need_register_atfork =
420  TRUE; /* At initialization, call pthread_atfork to install fork handler */
421 int __kmp_need_register_atfork_specified = TRUE;
422 
423 int __kmp_env_stksize = FALSE; /* KMP_STACKSIZE specified? */
424 int __kmp_env_blocktime = FALSE; /* KMP_BLOCKTIME specified? */
425 int __kmp_env_checks = FALSE; /* KMP_CHECKS specified? */
426 int __kmp_env_consistency_check = FALSE; /* KMP_CONSISTENCY_CHECK specified? */
427 
428 // From KMP_USE_YIELD:
429 // 0 = never yield;
430 // 1 = always yield (default);
431 // 2 = yield only if oversubscribed
432 kmp_int32 __kmp_use_yield = 1;
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 
439 /* ------------------------------------------------------ */
440 /* STATE mostly syncronized with global lock */
441 /* data written to rarely by primary threads, read often by workers */
442 /* TODO: None of this global padding stuff works consistently because the order
443  of declaration is not necessarily correlated to storage order. To fix this,
444  all the important globals must be put in a big structure instead. */
445 KMP_ALIGN_CACHE
446 kmp_info_t **__kmp_threads = NULL;
447 kmp_root_t **__kmp_root = NULL;
448 
449 /* data read/written to often by primary threads */
450 KMP_ALIGN_CACHE
451 volatile int __kmp_nth = 0;
452 volatile int __kmp_all_nth = 0;
453 volatile kmp_info_t *__kmp_thread_pool = NULL;
454 volatile kmp_team_t *__kmp_team_pool = NULL;
455 
456 KMP_ALIGN_CACHE
457 std::atomic<int> __kmp_thread_pool_active_nth = ATOMIC_VAR_INIT(0);
458 
459 /* -------------------------------------------------
460  * GLOBAL/ROOT STATE */
461 KMP_ALIGN_CACHE
462 kmp_global_t __kmp_global;
463 
464 /* ----------------------------------------------- */
465 /* GLOBAL SYNCHRONIZATION LOCKS */
466 /* TODO verify the need for these locks and if they need to be global */
467 
468 #if KMP_USE_INTERNODE_ALIGNMENT
469 /* Multinode systems have larger cache line granularity which can cause
470  * false sharing if the alignment is not large enough for these locks */
471 KMP_ALIGN_CACHE_INTERNODE
472 
473 KMP_BOOTSTRAP_LOCK_INIT(__kmp_initz_lock); /* Control initializations */
474 KMP_ALIGN_CACHE_INTERNODE
475 KMP_BOOTSTRAP_LOCK_INIT(__kmp_forkjoin_lock); /* control fork/join access */
476 KMP_ALIGN_CACHE_INTERNODE
477 KMP_BOOTSTRAP_LOCK_INIT(__kmp_exit_lock); /* exit() is not always thread-safe */
478 #if KMP_USE_MONITOR
479 /* control monitor thread creation */
480 KMP_ALIGN_CACHE_INTERNODE
481 KMP_BOOTSTRAP_LOCK_INIT(__kmp_monitor_lock);
482 #endif
483 /* used for the hack to allow threadprivate cache and __kmp_threads expansion
484  to co-exist */
485 KMP_ALIGN_CACHE_INTERNODE
486 KMP_BOOTSTRAP_LOCK_INIT(__kmp_tp_cached_lock);
487 
488 KMP_ALIGN_CACHE_INTERNODE
489 KMP_LOCK_INIT(__kmp_global_lock); /* Control OS/global access */
490 KMP_ALIGN_CACHE_INTERNODE
491 kmp_queuing_lock_t __kmp_dispatch_lock; /* Control dispatch access */
492 KMP_ALIGN_CACHE_INTERNODE
493 KMP_LOCK_INIT(__kmp_debug_lock); /* Control I/O access for KMP_DEBUG */
494 #else
495 KMP_ALIGN_CACHE
496 
497 KMP_BOOTSTRAP_LOCK_INIT(__kmp_initz_lock); /* Control initializations */
498 KMP_BOOTSTRAP_LOCK_INIT(__kmp_forkjoin_lock); /* control fork/join access */
499 KMP_BOOTSTRAP_LOCK_INIT(__kmp_exit_lock); /* exit() is not always thread-safe */
500 #if KMP_USE_MONITOR
501 /* control monitor thread creation */
502 KMP_BOOTSTRAP_LOCK_INIT(__kmp_monitor_lock);
503 #endif
504 /* used for the hack to allow threadprivate cache and __kmp_threads expansion
505  to co-exist */
506 KMP_BOOTSTRAP_LOCK_INIT(__kmp_tp_cached_lock);
507 
508 KMP_ALIGN(128)
509 KMP_LOCK_INIT(__kmp_global_lock); /* Control OS/global access */
510 KMP_ALIGN(128)
511 kmp_queuing_lock_t __kmp_dispatch_lock; /* Control dispatch access */
512 KMP_ALIGN(128)
513 KMP_LOCK_INIT(__kmp_debug_lock); /* Control I/O access for KMP_DEBUG */
514 #endif
515 
516 /* ----------------------------------------------- */
517 
518 #if KMP_HANDLE_SIGNALS
519 /* Signal handling is disabled by default, because it confuses users: In case of
520  sigsegv (or other trouble) in user code signal handler catches the signal,
521  which then "appears" in the monitor thread (when the monitor executes raise()
522  function). Users see signal in the monitor thread and blame OpenMP RTL.
523 
524  Grant said signal handling required on some older OSes (Irix?) supported by
525  KAI, because bad applications hung but not aborted. Currently it is not a
526  problem for Linux* OS, OS X* and Windows* OS.
527 
528  Grant: Found new hangs for EL4, EL5, and a Fedora Core machine. So I'm
529  putting the default back for now to see if that fixes hangs on those
530  machines.
531 
532  2010-04013 Lev: It was a bug in Fortran RTL. Fortran RTL prints a kind of
533  stack backtrace when program is aborting, but the code is not signal-safe.
534  When multiple signals raised at the same time (which occurs in dynamic
535  negative tests because all the worker threads detects the same error),
536  Fortran RTL may hang. The bug finally fixed in Fortran RTL library provided
537  by Steve R., and will be available soon. */
538 int __kmp_handle_signals = FALSE;
539 #endif
540 
541 #ifdef DEBUG_SUSPEND
542 int get_suspend_count_(void) {
543  int count = __kmp_suspend_count;
544  __kmp_suspend_count = 0;
545  return count;
546 }
547 void set_suspend_count_(int *value) { __kmp_suspend_count = *value; }
548 #endif
549 
550 // Symbols for MS mutual detection.
551 int _You_must_link_with_exactly_one_OpenMP_library = 1;
552 int _You_must_link_with_Intel_OpenMP_library = 1;
553 #if KMP_OS_WINDOWS && (KMP_VERSION_MAJOR > 4)
554 int _You_must_link_with_Microsoft_OpenMP_library = 1;
555 #endif
556 
557 kmp_target_offload_kind_t __kmp_target_offload = tgt_default;
558 
559 // OMP Pause Resources
560 kmp_pause_status_t __kmp_pause_status = kmp_not_paused;
561 
562 // end of file //
sched_type
Definition: kmp.h:351