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
19kmp_key_t __kmp_gtid_threadprivate_key;
20
21#if KMP_ARCH_X86 || KMP_ARCH_X86_64
22kmp_cpuinfo_t __kmp_cpuinfo = {.initialized: 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
28kmp_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.
32kmp_stats_list *__kmp_stats_list;
33
34// thread local pointer to stats node within list
35KMP_THREAD_LOCAL kmp_stats_list *__kmp_stats_thread_ptr = NULL;
36
37// gives reference tick for all events (considered the 0 tick)
38tsc_tick_count __kmp_stats_start_time;
39#endif
40
41/* ----------------------------------------------------- */
42/* INITIALIZATION VARIABLES */
43/* they are syncronized to write during init, but read anytime */
44volatile int __kmp_init_serial = FALSE;
45volatile int __kmp_init_gtid = FALSE;
46volatile int __kmp_init_common = FALSE;
47volatile int __kmp_need_register_serial = TRUE;
48volatile int __kmp_init_middle = FALSE;
49volatile int __kmp_init_parallel = FALSE;
50volatile int __kmp_init_hidden_helper = FALSE;
51volatile int __kmp_init_hidden_helper_threads = FALSE;
52volatile int __kmp_hidden_helper_team_done = FALSE;
53#if KMP_USE_MONITOR
54volatile int __kmp_init_monitor =
55 0; /* 1 - launched, 2 - actually started (Windows* OS only) */
56#endif
57volatile int __kmp_init_user_locks = FALSE;
58
59/* list of address of allocated caches for commons */
60kmp_cached_addr_t *__kmp_threadpriv_cache_list = NULL;
61
62int __kmp_init_counter = 0;
63int __kmp_root_counter = 0;
64int __kmp_version = 0;
65
66std::atomic<kmp_int32> __kmp_team_counter = 0;
67std::atomic<kmp_int32> __kmp_task_counter = 0;
68
69size_t __kmp_stksize = KMP_DEFAULT_STKSIZE;
70#if KMP_USE_MONITOR
71size_t __kmp_monitor_stksize = 0; // auto adjust
72#endif
73size_t __kmp_stkoffset = KMP_DEFAULT_STKOFFSET;
74int __kmp_stkpadding = KMP_MIN_STKPADDING;
75
76size_t __kmp_malloc_pool_incr = KMP_DEFAULT_MALLOC_POOL_INCR;
77
78// Barrier method defaults, settings, and strings.
79// branch factor = 2^branch_bits (only relevant for tree & hyper barrier types)
80kmp_uint32 __kmp_barrier_gather_bb_dflt = 2;
81/* branch_factor = 4 */ /* hyper2: C78980 */
82kmp_uint32 __kmp_barrier_release_bb_dflt = 2;
83/* branch_factor = 4 */ /* hyper2: C78980 */
84
85kmp_bar_pat_e __kmp_barrier_gather_pat_dflt = bp_hyper_bar;
86/* hyper2: C78980 */
87kmp_bar_pat_e __kmp_barrier_release_pat_dflt = bp_hyper_bar;
88/* hyper2: C78980 */
89
90kmp_uint32 __kmp_barrier_gather_branch_bits[bs_last_barrier] = {0};
91kmp_uint32 __kmp_barrier_release_branch_bits[bs_last_barrier] = {0};
92kmp_bar_pat_e __kmp_barrier_gather_pattern[bs_last_barrier] = {bp_linear_bar};
93kmp_bar_pat_e __kmp_barrier_release_pattern[bs_last_barrier] = {bp_linear_bar};
94char const *__kmp_barrier_branch_bit_env_name[bs_last_barrier] = {
95 "KMP_PLAIN_BARRIER", "KMP_FORKJOIN_BARRIER"
96#if KMP_FAST_REDUCTION_BARRIER
97 ,
98 "KMP_REDUCTION_BARRIER"
99#endif // KMP_FAST_REDUCTION_BARRIER
100};
101char const *__kmp_barrier_pattern_env_name[bs_last_barrier] = {
102 "KMP_PLAIN_BARRIER_PATTERN", "KMP_FORKJOIN_BARRIER_PATTERN"
103#if KMP_FAST_REDUCTION_BARRIER
104 ,
105 "KMP_REDUCTION_BARRIER_PATTERN"
106#endif // KMP_FAST_REDUCTION_BARRIER
107};
108char const *__kmp_barrier_type_name[bs_last_barrier] = {"plain", "forkjoin"
109#if KMP_FAST_REDUCTION_BARRIER
110 ,
111 "reduction"
112#endif // KMP_FAST_REDUCTION_BARRIER
113};
114char const *__kmp_barrier_pattern_name[bp_last_bar] = {
115 "linear", "tree", "hyper", "hierarchical", "dist"};
116
117int __kmp_allThreadsSpecified = 0;
118size_t __kmp_align_alloc = CACHE_LINE;
119
120int __kmp_generate_warnings = kmp_warnings_low;
121int __kmp_reserve_warn = 0;
122int __kmp_xproc = 0;
123int __kmp_avail_proc = 0;
124size_t __kmp_sys_min_stksize = KMP_MIN_STKSIZE;
125int __kmp_sys_max_nth = KMP_MAX_NTH;
126int __kmp_max_nth = 0;
127int __kmp_cg_max_nth = 0;
128int __kmp_task_max_nth = 0;
129int __kmp_teams_max_nth = 0;
130int __kmp_threads_capacity = 0;
131int __kmp_dflt_team_nth = 0;
132int __kmp_dflt_team_nth_ub = 0;
133int __kmp_tp_capacity = 0;
134int __kmp_tp_cached = 0;
135int __kmp_dispatch_num_buffers = KMP_DFLT_DISP_NUM_BUFF;
136int __kmp_dflt_max_active_levels = 1; // Nesting off by default
137bool __kmp_dflt_max_active_levels_set = false; // Don't override set value
138#if KMP_NESTED_HOT_TEAMS
139int __kmp_hot_teams_mode = 0; /* 0 - free extra threads when reduced */
140/* 1 - keep extra threads when reduced */
141int __kmp_hot_teams_max_level = 1; /* nesting level of hot teams */
142#endif
143enum library_type __kmp_library = library_none;
144enum sched_type __kmp_sched =
145 kmp_sch_default; /* scheduling method for runtime scheduling */
146enum sched_type __kmp_static =
147 kmp_sch_static_greedy; /* default static scheduling method */
148enum sched_type __kmp_guided =
149 kmp_sch_guided_iterative_chunked; /* default guided scheduling method */
150enum sched_type __kmp_auto =
151 kmp_sch_guided_analytical_chunked; /* default auto scheduling method */
152#if KMP_USE_HIER_SCHED
153int __kmp_dispatch_hand_threading = 0;
154int __kmp_hier_max_units[kmp_hier_layer_e::LAYER_LAST + 1];
155int __kmp_hier_threads_per[kmp_hier_layer_e::LAYER_LAST + 1];
156kmp_hier_sched_env_t __kmp_hier_scheds = {0, 0, NULL, NULL, NULL};
157#endif
158int __kmp_dflt_blocktime = KMP_DEFAULT_BLOCKTIME; // in microseconds
159char __kmp_blocktime_units = 'm'; // Units specified in KMP_BLOCKTIME
160bool __kmp_wpolicy_passive = false;
161#if KMP_USE_MONITOR
162int __kmp_monitor_wakeups = KMP_MIN_MONITOR_WAKEUPS;
163int __kmp_bt_intervals = KMP_INTERVALS_FROM_BLOCKTIME(KMP_DEFAULT_BLOCKTIME,
164 KMP_MIN_MONITOR_WAKEUPS);
165#endif
166#ifdef KMP_ADJUST_BLOCKTIME
167int __kmp_zero_bt = FALSE;
168#endif /* KMP_ADJUST_BLOCKTIME */
169#ifdef KMP_DFLT_NTH_CORES
170int __kmp_ncores = 0;
171#endif
172int __kmp_chunk = 0;
173int __kmp_force_monotonic = 0;
174int __kmp_abort_delay = 0;
175#if (KMP_OS_LINUX || KMP_OS_AIX || KMP_OS_SOLARIS) && defined(KMP_TDATA_GTID)
176int __kmp_gtid_mode = 3; /* use __declspec(thread) TLS to store gtid */
177int __kmp_adjust_gtid_mode = FALSE;
178#elif KMP_OS_WINDOWS
179int __kmp_gtid_mode = 2; /* use TLS functions to store gtid */
180int __kmp_adjust_gtid_mode = FALSE;
181#else
182int __kmp_gtid_mode = 0; /* select method to get gtid based on #threads */
183int __kmp_adjust_gtid_mode = TRUE;
184#endif /* KMP_OS_LINUX && defined(KMP_TDATA_GTID) */
185#ifdef KMP_TDATA_GTID
186KMP_THREAD_LOCAL int __kmp_gtid = KMP_GTID_DNE;
187#endif /* KMP_TDATA_GTID */
188int __kmp_tls_gtid_min = INT_MAX;
189int __kmp_foreign_tp = TRUE;
190#if KMP_ARCH_X86 || KMP_ARCH_X86_64
191int __kmp_inherit_fp_control = TRUE;
192kmp_int16 __kmp_init_x87_fpu_control_word = 0;
193kmp_uint32 __kmp_init_mxcsr = 0;
194#endif /* KMP_ARCH_X86 || KMP_ARCH_X86_64 */
195
196#ifdef USE_LOAD_BALANCE
197double __kmp_load_balance_interval = 1.0;
198#endif /* USE_LOAD_BALANCE */
199
200kmp_nested_nthreads_t __kmp_nested_nth = {NULL, .size: 0, .used: 0};
201
202#if KMP_USE_ADAPTIVE_LOCKS
203
204kmp_adaptive_backoff_params_t __kmp_adaptive_backoff_params = {
205 .max_soft_retries: 1, .max_badness: 1024}; // TODO: tune it!
206
207#if KMP_DEBUG_ADAPTIVE_LOCKS
208const char *__kmp_speculative_statsfile = "-";
209#endif
210
211#endif // KMP_USE_ADAPTIVE_LOCKS
212
213int __kmp_display_env = FALSE;
214int __kmp_display_env_verbose = FALSE;
215int __kmp_omp_cancellation = FALSE;
216int __kmp_nteams = 0;
217int __kmp_teams_thread_limit = 0;
218
219#if KMP_HAVE_MWAIT || KMP_HAVE_UMWAIT
220int __kmp_user_level_mwait = FALSE;
221int __kmp_umwait_enabled = FALSE;
222int __kmp_mwait_enabled = FALSE;
223int __kmp_mwait_hints = 0;
224#endif
225
226#if KMP_HAVE_UMWAIT
227int __kmp_waitpkg_enabled = 0;
228int __kmp_tpause_state = 0;
229int __kmp_tpause_hint = 1;
230int __kmp_tpause_enabled = 0;
231#endif
232
233/* map OMP 3.0 schedule types with our internal schedule types */
234enum sched_type __kmp_sch_map[kmp_sched_upper - kmp_sched_lower_ext +
235 kmp_sched_upper_std - kmp_sched_lower - 2] = {
236 kmp_sch_static_chunked, // ==> kmp_sched_static = 1
237 kmp_sch_dynamic_chunked, // ==> kmp_sched_dynamic = 2
238 kmp_sch_guided_chunked, // ==> kmp_sched_guided = 3
239 kmp_sch_auto, // ==> kmp_sched_auto = 4
240 kmp_sch_trapezoidal // ==> kmp_sched_trapezoidal = 101
241 // will likely not be used, introduced here just to debug the code
242 // of public intel extension schedules
243};
244
245#if KMP_MIC_SUPPORTED
246enum mic_type __kmp_mic_type = non_mic;
247#endif
248
249#if KMP_AFFINITY_SUPPORTED
250
251KMPAffinity *__kmp_affinity_dispatch = NULL;
252
253#if KMP_USE_HWLOC
254int __kmp_hwloc_error = FALSE;
255hwloc_topology_t __kmp_hwloc_topology = NULL;
256#endif
257
258#if KMP_OS_WINDOWS
259#if KMP_GROUP_AFFINITY
260int __kmp_num_proc_groups = 1;
261#endif /* KMP_GROUP_AFFINITY */
262kmp_GetActiveProcessorCount_t __kmp_GetActiveProcessorCount = NULL;
263kmp_GetActiveProcessorGroupCount_t __kmp_GetActiveProcessorGroupCount = NULL;
264kmp_GetThreadGroupAffinity_t __kmp_GetThreadGroupAffinity = NULL;
265kmp_SetThreadGroupAffinity_t __kmp_SetThreadGroupAffinity = NULL;
266#endif /* KMP_OS_WINDOWS */
267
268size_t __kmp_affin_mask_size = 0;
269enum affinity_top_method __kmp_affinity_top_method =
270 affinity_top_method_default;
271
272// Regular thread affinity settings from KMP_AFFINITY
273kmp_affinity_t __kmp_affinity = KMP_AFFINITY_INIT("KMP_AFFINITY");
274// Hidden helper thread affinity settings from KMP_HIDDEN_HELPER_AFFINITY
275kmp_affinity_t __kmp_hh_affinity =
276 KMP_AFFINITY_INIT("KMP_HIDDEN_HELPER_AFFINITY");
277kmp_affinity_t *__kmp_affinities[] = {&__kmp_affinity, &__kmp_hh_affinity};
278
279char *__kmp_cpuinfo_file = NULL;
280#if KMP_WEIGHTED_ITERATIONS_SUPPORTED
281int __kmp_first_osid_with_ecore = -1;
282#endif
283
284#endif /* KMP_AFFINITY_SUPPORTED */
285
286kmp_nested_proc_bind_t __kmp_nested_proc_bind = {NULL, .size: 0, .used: 0};
287kmp_proc_bind_t __kmp_teams_proc_bind = proc_bind_spread;
288int __kmp_affinity_num_places = 0;
289int __kmp_display_affinity = FALSE;
290char *__kmp_affinity_format = NULL;
291
292kmp_int32 __kmp_default_device = 0;
293
294kmp_tasking_mode_t __kmp_tasking_mode = tskm_task_teams;
295kmp_int32 __kmp_max_task_priority = 0;
296kmp_uint64 __kmp_taskloop_min_tasks = 0;
297
298int __kmp_memkind_available = 0;
299bool __kmp_hwloc_available = false;
300omp_allocator_handle_t const omp_null_allocator = NULL;
301omp_allocator_handle_t const omp_default_mem_alloc =
302 (omp_allocator_handle_t const)1;
303omp_allocator_handle_t const omp_large_cap_mem_alloc =
304 (omp_allocator_handle_t const)2;
305omp_allocator_handle_t const omp_const_mem_alloc =
306 (omp_allocator_handle_t const)3;
307omp_allocator_handle_t const omp_high_bw_mem_alloc =
308 (omp_allocator_handle_t const)4;
309omp_allocator_handle_t const omp_low_lat_mem_alloc =
310 (omp_allocator_handle_t const)5;
311omp_allocator_handle_t const omp_cgroup_mem_alloc =
312 (omp_allocator_handle_t const)6;
313omp_allocator_handle_t const omp_pteam_mem_alloc =
314 (omp_allocator_handle_t const)7;
315omp_allocator_handle_t const omp_thread_mem_alloc =
316 (omp_allocator_handle_t const)8;
317omp_allocator_handle_t const llvm_omp_target_host_mem_alloc =
318 (omp_allocator_handle_t const)100;
319omp_allocator_handle_t const llvm_omp_target_shared_mem_alloc =
320 (omp_allocator_handle_t const)101;
321omp_allocator_handle_t const llvm_omp_target_device_mem_alloc =
322 (omp_allocator_handle_t const)102;
323omp_allocator_handle_t const kmp_max_mem_alloc =
324 (omp_allocator_handle_t const)1024;
325omp_allocator_handle_t __kmp_def_allocator = omp_default_mem_alloc;
326
327omp_memspace_handle_t const omp_null_mem_space = (omp_memspace_handle_t const)0;
328omp_memspace_handle_t const omp_default_mem_space =
329 (omp_memspace_handle_t const)99;
330omp_memspace_handle_t const omp_large_cap_mem_space =
331 (omp_memspace_handle_t const)1;
332omp_memspace_handle_t const omp_const_mem_space =
333 (omp_memspace_handle_t const)2;
334omp_memspace_handle_t const omp_high_bw_mem_space =
335 (omp_memspace_handle_t const)3;
336omp_memspace_handle_t const omp_low_lat_mem_space =
337 (omp_memspace_handle_t const)4;
338omp_memspace_handle_t const llvm_omp_target_host_mem_space =
339 (omp_memspace_handle_t const)100;
340omp_memspace_handle_t const llvm_omp_target_shared_mem_space =
341 (omp_memspace_handle_t const)101;
342omp_memspace_handle_t const llvm_omp_target_device_mem_space =
343 (omp_memspace_handle_t const)102;
344omp_memspace_handle_t const kmp_max_mem_space =
345 (omp_memspace_handle_t const)1024;
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. */
352KMP_BUILD_ASSERT(sizeof(kmp_tasking_flags_t) == 4);
353
354int __kmp_task_stealing_constraint = 1; /* Constrain task stealing by default */
355int __kmp_enable_task_throttling = 1;
356
357#ifdef DEBUG_SUSPEND
358int __kmp_suspend_count = 0;
359#endif
360
361int __kmp_settings = FALSE;
362int __kmp_duplicate_library_ok = 0;
363#if USE_ITT_BUILD
364int __kmp_forkjoin_frames = 1;
365int __kmp_forkjoin_frames_mode = 3;
366#endif
367PACKED_REDUCTION_METHOD_T __kmp_force_reduction_method =
368 reduction_method_not_defined;
369int __kmp_determ_red = FALSE;
370
371#ifdef KMP_DEBUG
372int kmp_a_debug = 0;
373int kmp_b_debug = 0;
374int kmp_c_debug = 0;
375int kmp_d_debug = 0;
376int kmp_e_debug = 0;
377int kmp_f_debug = 0;
378int kmp_diag = 0;
379#endif
380
381/* For debug information logging using rotating buffer */
382int __kmp_debug_buf =
383 FALSE; /* TRUE means use buffer, FALSE means print to stderr */
384int __kmp_debug_buf_lines =
385 KMP_DEBUG_BUF_LINES_INIT; /* Lines of debug stored in buffer */
386int __kmp_debug_buf_chars =
387 KMP_DEBUG_BUF_CHARS_INIT; /* Characters allowed per line in buffer */
388int __kmp_debug_buf_atomic =
389 FALSE; /* TRUE means use atomic update of buffer entry pointer */
390
391char *__kmp_debug_buffer = NULL; /* Debug buffer itself */
392std::atomic<int> __kmp_debug_count =
393 0; /* number of lines printed in buffer so far */
394int __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
399int __kmp_par_range; /* +1 => only go par for constructs in range */
400/* -1 => only go par for constructs outside range */
401char __kmp_par_range_routine[KMP_PAR_RANGE_ROUTINE_LEN] = {'\0'};
402char __kmp_par_range_filename[KMP_PAR_RANGE_FILENAME_LEN] = {'\0'};
403int __kmp_par_range_lb = 0;
404int __kmp_par_range_ub = INT_MAX;
405#endif /* KMP_DEBUG */
406
407/* For printing out dynamic storage map for threads and teams */
408int __kmp_storage_map =
409 FALSE; /* True means print storage map for threads and teams */
410int __kmp_storage_map_verbose =
411 FALSE; /* True means storage map includes placement info */
412int __kmp_storage_map_verbose_specified = FALSE;
413/* Initialize the library data structures when we fork a child process, defaults
414 * to TRUE */
415int __kmp_need_register_atfork =
416 TRUE; /* At initialization, call pthread_atfork to install fork handler */
417int __kmp_need_register_atfork_specified = TRUE;
418
419int __kmp_env_stksize = FALSE; /* KMP_STACKSIZE specified? */
420int __kmp_env_blocktime = FALSE; /* KMP_BLOCKTIME specified? */
421int __kmp_env_checks = FALSE; /* KMP_CHECKS specified? */
422int __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
430kmp_int32 __kmp_use_yield = 0;
431#else
432kmp_int32 __kmp_use_yield = 1;
433#endif
434
435// This will be 1 if KMP_USE_YIELD environment variable was set explicitly
436kmp_int32 __kmp_use_yield_exp_set = 0;
437
438kmp_uint32 __kmp_yield_init = KMP_INIT_WAIT;
439kmp_uint32 __kmp_yield_next = KMP_NEXT_WAIT;
440kmp_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. */
448KMP_ALIGN_CACHE
449kmp_info_t **__kmp_threads = NULL;
450kmp_root_t **__kmp_root = NULL;
451kmp_old_threads_list_t *__kmp_old_threads_list = NULL;
452
453/* data read/written to often by primary threads */
454KMP_ALIGN_CACHE
455volatile int __kmp_nth = 0;
456volatile int __kmp_all_nth = 0;
457volatile kmp_info_t *__kmp_thread_pool = NULL;
458volatile kmp_team_t *__kmp_team_pool = NULL;
459
460KMP_ALIGN_CACHE
461std::atomic<int> __kmp_thread_pool_active_nth = 0;
462
463/* -------------------------------------------------
464 * GLOBAL/ROOT STATE */
465KMP_ALIGN_CACHE
466kmp_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 */
475KMP_ALIGN_CACHE_INTERNODE
476
477KMP_BOOTSTRAP_LOCK_INIT(__kmp_initz_lock); /* Control initializations */
478KMP_ALIGN_CACHE_INTERNODE
479KMP_BOOTSTRAP_LOCK_INIT(__kmp_forkjoin_lock); /* control fork/join access */
480KMP_ALIGN_CACHE_INTERNODE
481KMP_BOOTSTRAP_LOCK_INIT(__kmp_exit_lock); /* exit() is not always thread-safe */
482#if KMP_USE_MONITOR
483/* control monitor thread creation */
484KMP_ALIGN_CACHE_INTERNODE
485KMP_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 */
489KMP_ALIGN_CACHE_INTERNODE
490KMP_BOOTSTRAP_LOCK_INIT(__kmp_tp_cached_lock);
491
492KMP_ALIGN_CACHE_INTERNODE
493KMP_LOCK_INIT(__kmp_global_lock); /* Control OS/global access */
494#else
495KMP_ALIGN_CACHE
496
497KMP_BOOTSTRAP_LOCK_INIT(__kmp_initz_lock); /* Control initializations */
498KMP_BOOTSTRAP_LOCK_INIT(__kmp_forkjoin_lock); /* control fork/join access */
499KMP_BOOTSTRAP_LOCK_INIT(__kmp_exit_lock); /* exit() is not always thread-safe */
500#if KMP_USE_MONITOR
501/* control monitor thread creation */
502KMP_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 */
506KMP_BOOTSTRAP_LOCK_INIT(__kmp_tp_cached_lock);
507
508KMP_ALIGN(128)
509KMP_LOCK_INIT(__kmp_global_lock); /* Control OS/global access */
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. */
534int __kmp_handle_signals = FALSE;
535#endif
536
537#ifdef DEBUG_SUSPEND
538int get_suspend_count_(void) {
539 int count = __kmp_suspend_count;
540 __kmp_suspend_count = 0;
541 return count;
542}
543void set_suspend_count_(int *value) { __kmp_suspend_count = *value; }
544#endif
545
546kmp_target_offload_kind_t __kmp_target_offload = tgt_default;
547
548// OMP Pause Resources
549kmp_pause_status_t __kmp_pause_status = kmp_not_paused;
550
551// Nesting mode
552int __kmp_nesting_mode = 0;
553int __kmp_nesting_mode_nlevels = 1;
554int *__kmp_nesting_nth_level;
555
556#if OMPX_TASKGRAPH
557// TDG record & replay
558int __kmp_tdg_dot = 0;
559kmp_int32 __kmp_max_tdgs = 100;
560kmp_tdg_info_t **__kmp_global_tdgs = NULL;
561kmp_int32 __kmp_curr_tdg_idx =
562 0; // Id of the current TDG being recorded or executed
563kmp_int32 __kmp_num_tdg = 0;
564kmp_int32 __kmp_successors_size = 10; // Initial succesor size list for
565 // recording
566std::atomic<kmp_int32> __kmp_tdg_task_id = 0;
567#endif
568// end of file //
569
570

source code of openmp/runtime/src/kmp_global.cpp