LLVM OpenMP* Runtime Library
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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
19kmp_key_t __kmp_gtid_threadprivate_key;
20
21#if KMP_ARCH_X86 || KMP_ARCH_X86_64
22kmp_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
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_init_middle = FALSE;
48volatile int __kmp_init_parallel = FALSE;
49volatile int __kmp_init_hidden_helper = FALSE;
50volatile int __kmp_init_hidden_helper_threads = FALSE;
51volatile int __kmp_hidden_helper_team_done = FALSE;
52#if KMP_USE_MONITOR
53volatile int __kmp_init_monitor =
54 0; /* 1 - launched, 2 - actually started (Windows* OS only) */
55#endif
56volatile int __kmp_init_user_locks = FALSE;
57
58/* list of address of allocated caches for commons */
59kmp_cached_addr_t *__kmp_threadpriv_cache_list = NULL;
60
61int __kmp_init_counter = 0;
62int __kmp_root_counter = 0;
63int __kmp_version = 0;
64
65std::atomic<kmp_int32> __kmp_team_counter = ATOMIC_VAR_INIT(0);
66std::atomic<kmp_int32> __kmp_task_counter = ATOMIC_VAR_INIT(0);
67
68size_t __kmp_stksize = KMP_DEFAULT_STKSIZE;
69#if KMP_USE_MONITOR
70size_t __kmp_monitor_stksize = 0; // auto adjust
71#endif
72size_t __kmp_stkoffset = KMP_DEFAULT_STKOFFSET;
73int __kmp_stkpadding = KMP_MIN_STKPADDING;
74
75size_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)
79kmp_uint32 __kmp_barrier_gather_bb_dflt = 2;
80/* branch_factor = 4 */ /* hyper2: C78980 */
81kmp_uint32 __kmp_barrier_release_bb_dflt = 2;
82/* branch_factor = 4 */ /* hyper2: C78980 */
83
84kmp_bar_pat_e __kmp_barrier_gather_pat_dflt = bp_hyper_bar;
85/* hyper2: C78980 */
86kmp_bar_pat_e __kmp_barrier_release_pat_dflt = bp_hyper_bar;
87/* hyper2: C78980 */
88
89kmp_uint32 __kmp_barrier_gather_branch_bits[bs_last_barrier] = {0};
90kmp_uint32 __kmp_barrier_release_branch_bits[bs_last_barrier] = {0};
91kmp_bar_pat_e __kmp_barrier_gather_pattern[bs_last_barrier] = {bp_linear_bar};
92kmp_bar_pat_e __kmp_barrier_release_pattern[bs_last_barrier] = {bp_linear_bar};
93char 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};
100char 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};
107char 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};
113char const *__kmp_barrier_pattern_name[bp_last_bar] = {
114 "linear", "tree", "hyper", "hierarchical", "dist"};
115
116int __kmp_allThreadsSpecified = 0;
117size_t __kmp_align_alloc = CACHE_LINE;
118
119int __kmp_generate_warnings = kmp_warnings_low;
120int __kmp_reserve_warn = 0;
121int __kmp_xproc = 0;
122int __kmp_avail_proc = 0;
123size_t __kmp_sys_min_stksize = KMP_MIN_STKSIZE;
124int __kmp_sys_max_nth = KMP_MAX_NTH;
125int __kmp_max_nth = 0;
126int __kmp_cg_max_nth = 0;
127int __kmp_teams_max_nth = 0;
128int __kmp_threads_capacity = 0;
129int __kmp_dflt_team_nth = 0;
130int __kmp_dflt_team_nth_ub = 0;
131int __kmp_tp_capacity = 0;
132int __kmp_tp_cached = 0;
133int __kmp_dispatch_num_buffers = KMP_DFLT_DISP_NUM_BUFF;
134int __kmp_dflt_max_active_levels = 1; // Nesting off by default
135bool __kmp_dflt_max_active_levels_set = false; // Don't override set value
136#if KMP_NESTED_HOT_TEAMS
137int __kmp_hot_teams_mode = 0; /* 0 - free extra threads when reduced */
138/* 1 - keep extra threads when reduced */
139int __kmp_hot_teams_max_level = 1; /* nesting level of hot teams */
140#endif
141enum library_type __kmp_library = library_none;
142enum sched_type __kmp_sched =
143 kmp_sch_default; /* scheduling method for runtime scheduling */
144enum sched_type __kmp_static =
145 kmp_sch_static_greedy; /* default static scheduling method */
146enum sched_type __kmp_guided =
147 kmp_sch_guided_iterative_chunked; /* default guided scheduling method */
148enum sched_type __kmp_auto =
149 kmp_sch_guided_analytical_chunked; /* default auto scheduling method */
150#if KMP_USE_HIER_SCHED
151int __kmp_dispatch_hand_threading = 0;
152int __kmp_hier_max_units[kmp_hier_layer_e::LAYER_LAST + 1];
153int __kmp_hier_threads_per[kmp_hier_layer_e::LAYER_LAST + 1];
154kmp_hier_sched_env_t __kmp_hier_scheds = {0, 0, NULL, NULL, NULL};
155#endif
156int __kmp_dflt_blocktime = KMP_DEFAULT_BLOCKTIME;
157#if KMP_USE_MONITOR
158int __kmp_monitor_wakeups = KMP_MIN_MONITOR_WAKEUPS;
159int __kmp_bt_intervals = KMP_INTERVALS_FROM_BLOCKTIME(KMP_DEFAULT_BLOCKTIME,
160 KMP_MIN_MONITOR_WAKEUPS);
161#endif
162#ifdef KMP_ADJUST_BLOCKTIME
163int __kmp_zero_bt = FALSE;
164#endif /* KMP_ADJUST_BLOCKTIME */
165#ifdef KMP_DFLT_NTH_CORES
166int __kmp_ncores = 0;
167#endif
168int __kmp_chunk = 0;
169int __kmp_force_monotonic = 0;
170int __kmp_abort_delay = 0;
171#if KMP_OS_LINUX && defined(KMP_TDATA_GTID)
172int __kmp_gtid_mode = 3; /* use __declspec(thread) TLS to store gtid */
173int __kmp_adjust_gtid_mode = FALSE;
174#elif KMP_OS_WINDOWS
175int __kmp_gtid_mode = 2; /* use TLS functions to store gtid */
176int __kmp_adjust_gtid_mode = FALSE;
177#else
178int __kmp_gtid_mode = 0; /* select method to get gtid based on #threads */
179int __kmp_adjust_gtid_mode = TRUE;
180#endif /* KMP_OS_LINUX && defined(KMP_TDATA_GTID) */
181#ifdef KMP_TDATA_GTID
182KMP_THREAD_LOCAL int __kmp_gtid = KMP_GTID_DNE;
183#endif /* KMP_TDATA_GTID */
184int __kmp_tls_gtid_min = INT_MAX;
185int __kmp_foreign_tp = TRUE;
186#if KMP_ARCH_X86 || KMP_ARCH_X86_64
187int __kmp_inherit_fp_control = TRUE;
188kmp_int16 __kmp_init_x87_fpu_control_word = 0;
189kmp_uint32 __kmp_init_mxcsr = 0;
190#endif /* KMP_ARCH_X86 || KMP_ARCH_X86_64 */
191
192#ifdef USE_LOAD_BALANCE
193double __kmp_load_balance_interval = 1.0;
194#endif /* USE_LOAD_BALANCE */
195
196kmp_nested_nthreads_t __kmp_nested_nth = {NULL, 0, 0};
197
198#if KMP_USE_ADAPTIVE_LOCKS
199
200kmp_adaptive_backoff_params_t __kmp_adaptive_backoff_params = {
201 1, 1024}; // TODO: tune it!
202
203#if KMP_DEBUG_ADAPTIVE_LOCKS
204const char *__kmp_speculative_statsfile = "-";
205#endif
206
207#endif // KMP_USE_ADAPTIVE_LOCKS
208
209int __kmp_display_env = FALSE;
210int __kmp_display_env_verbose = FALSE;
211int __kmp_omp_cancellation = FALSE;
212int __kmp_nteams = 0;
213int __kmp_teams_thread_limit = 0;
214
215#if KMP_HAVE_MWAIT || KMP_HAVE_UMWAIT
216int __kmp_user_level_mwait = FALSE;
217int __kmp_umwait_enabled = FALSE;
218int __kmp_mwait_enabled = FALSE;
219int __kmp_mwait_hints = 0;
220#endif
221
222#if KMP_HAVE_UMWAIT
223int __kmp_waitpkg_enabled = 0;
224int __kmp_tpause_state = 0;
225int __kmp_tpause_hint = 1;
226int __kmp_tpause_enabled = 0;
227#endif
228
229/* map OMP 3.0 schedule types with our internal schedule types */
230enum 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
242enum clock_function_type __kmp_clock_function;
243int __kmp_clock_function_param;
244#endif /* KMP_OS_LINUX */
245
246#if KMP_MIC_SUPPORTED
247enum mic_type __kmp_mic_type = non_mic;
248#endif
249
250#if KMP_AFFINITY_SUPPORTED
251
252KMPAffinity *__kmp_affinity_dispatch = NULL;
253
254#if KMP_USE_HWLOC
255int __kmp_hwloc_error = FALSE;
256hwloc_topology_t __kmp_hwloc_topology = NULL;
257#endif
258
259#if KMP_OS_WINDOWS
260#if KMP_GROUP_AFFINITY
261int __kmp_num_proc_groups = 1;
262#endif /* KMP_GROUP_AFFINITY */
263kmp_GetActiveProcessorCount_t __kmp_GetActiveProcessorCount = NULL;
264kmp_GetActiveProcessorGroupCount_t __kmp_GetActiveProcessorGroupCount = NULL;
265kmp_GetThreadGroupAffinity_t __kmp_GetThreadGroupAffinity = NULL;
266kmp_SetThreadGroupAffinity_t __kmp_SetThreadGroupAffinity = NULL;
267#endif /* KMP_OS_WINDOWS */
268
269size_t __kmp_affin_mask_size = 0;
270enum affinity_type __kmp_affinity_type = affinity_default;
271kmp_hw_t __kmp_affinity_gran = KMP_HW_UNKNOWN;
272int __kmp_affinity_gran_levels = -1;
273int __kmp_affinity_dups = TRUE;
274enum affinity_top_method __kmp_affinity_top_method =
275 affinity_top_method_default;
276int __kmp_affinity_compact = 0;
277int __kmp_affinity_offset = 0;
278int __kmp_affinity_verbose = FALSE;
279int __kmp_affinity_warnings = TRUE;
280int __kmp_affinity_respect_mask = affinity_respect_mask_default;
281char *__kmp_affinity_proclist = NULL;
282kmp_affin_mask_t *__kmp_affinity_masks = NULL;
283unsigned __kmp_affinity_num_masks = 0;
284
285char *__kmp_cpuinfo_file = NULL;
286
287#endif /* KMP_AFFINITY_SUPPORTED */
288
289kmp_nested_proc_bind_t __kmp_nested_proc_bind = {NULL, 0, 0};
290kmp_proc_bind_t __kmp_teams_proc_bind = proc_bind_spread;
291int __kmp_affinity_num_places = 0;
292int __kmp_display_affinity = FALSE;
293char *__kmp_affinity_format = NULL;
294
295kmp_int32 __kmp_default_device = 0;
296
297kmp_tasking_mode_t __kmp_tasking_mode = tskm_task_teams;
298kmp_int32 __kmp_max_task_priority = 0;
299kmp_uint64 __kmp_taskloop_min_tasks = 0;
300
301int __kmp_memkind_available = 0;
302omp_allocator_handle_t const omp_null_allocator = NULL;
303omp_allocator_handle_t const omp_default_mem_alloc =
304 (omp_allocator_handle_t const)1;
305omp_allocator_handle_t const omp_large_cap_mem_alloc =
306 (omp_allocator_handle_t const)2;
307omp_allocator_handle_t const omp_const_mem_alloc =
308 (omp_allocator_handle_t const)3;
309omp_allocator_handle_t const omp_high_bw_mem_alloc =
310 (omp_allocator_handle_t const)4;
311omp_allocator_handle_t const omp_low_lat_mem_alloc =
312 (omp_allocator_handle_t const)5;
313omp_allocator_handle_t const omp_cgroup_mem_alloc =
314 (omp_allocator_handle_t const)6;
315omp_allocator_handle_t const omp_pteam_mem_alloc =
316 (omp_allocator_handle_t const)7;
317omp_allocator_handle_t const omp_thread_mem_alloc =
318 (omp_allocator_handle_t const)8;
319// Preview of target memory support
320omp_allocator_handle_t const llvm_omp_target_host_mem_alloc =
321 (omp_allocator_handle_t const)100;
322omp_allocator_handle_t const llvm_omp_target_shared_mem_alloc =
323 (omp_allocator_handle_t const)101;
324omp_allocator_handle_t const llvm_omp_target_device_mem_alloc =
325 (omp_allocator_handle_t const)102;
326omp_allocator_handle_t const kmp_max_mem_alloc =
327 (omp_allocator_handle_t const)1024;
328omp_allocator_handle_t __kmp_def_allocator = omp_default_mem_alloc;
329
330omp_memspace_handle_t const omp_default_mem_space =
331 (omp_memspace_handle_t const)0;
332omp_memspace_handle_t const omp_large_cap_mem_space =
333 (omp_memspace_handle_t const)1;
334omp_memspace_handle_t const omp_const_mem_space =
335 (omp_memspace_handle_t const)2;
336omp_memspace_handle_t const omp_high_bw_mem_space =
337 (omp_memspace_handle_t const)3;
338omp_memspace_handle_t const omp_low_lat_mem_space =
339 (omp_memspace_handle_t const)4;
340// Preview of target memory support
341omp_memspace_handle_t const llvm_omp_target_host_mem_space =
342 (omp_memspace_handle_t const)100;
343omp_memspace_handle_t const llvm_omp_target_shared_mem_space =
344 (omp_memspace_handle_t const)101;
345omp_memspace_handle_t const llvm_omp_target_device_mem_space =
346 (omp_memspace_handle_t const)102;
347
348/* This check ensures that the compiler is passing the correct data type for the
349 flags formal parameter of the function kmpc_omp_task_alloc(). If the type is
350 not a 4-byte type, then give an error message about a non-positive length
351 array pointing here. If that happens, the kmp_tasking_flags_t structure must
352 be redefined to have exactly 32 bits. */
353KMP_BUILD_ASSERT(sizeof(kmp_tasking_flags_t) == 4);
354
355int __kmp_task_stealing_constraint = 1; /* Constrain task stealing by default */
356int __kmp_enable_task_throttling = 1;
357
358#ifdef DEBUG_SUSPEND
359int __kmp_suspend_count = 0;
360#endif
361
362int __kmp_settings = FALSE;
363int __kmp_duplicate_library_ok = 0;
364#if USE_ITT_BUILD
365int __kmp_forkjoin_frames = 1;
366int __kmp_forkjoin_frames_mode = 3;
367#endif
368PACKED_REDUCTION_METHOD_T __kmp_force_reduction_method =
369 reduction_method_not_defined;
370int __kmp_determ_red = FALSE;
371
372#ifdef KMP_DEBUG
373int kmp_a_debug = 0;
374int kmp_b_debug = 0;
375int kmp_c_debug = 0;
376int kmp_d_debug = 0;
377int kmp_e_debug = 0;
378int kmp_f_debug = 0;
379int kmp_diag = 0;
380#endif
381
382/* For debug information logging using rotating buffer */
383int __kmp_debug_buf =
384 FALSE; /* TRUE means use buffer, FALSE means print to stderr */
385int __kmp_debug_buf_lines =
386 KMP_DEBUG_BUF_LINES_INIT; /* Lines of debug stored in buffer */
387int __kmp_debug_buf_chars =
388 KMP_DEBUG_BUF_CHARS_INIT; /* Characters allowed per line in buffer */
389int __kmp_debug_buf_atomic =
390 FALSE; /* TRUE means use atomic update of buffer entry pointer */
391
392char *__kmp_debug_buffer = NULL; /* Debug buffer itself */
393std::atomic<int> __kmp_debug_count =
394 ATOMIC_VAR_INIT(0); /* number of lines printed in buffer so far */
395int __kmp_debug_buf_warn_chars =
396 0; /* Keep track of char increase recommended in warnings */
397/* end rotating debug buffer */
398
399#ifdef KMP_DEBUG
400int __kmp_par_range; /* +1 => only go par for constructs in range */
401/* -1 => only go par for constructs outside range */
402char __kmp_par_range_routine[KMP_PAR_RANGE_ROUTINE_LEN] = {'\0'};
403char __kmp_par_range_filename[KMP_PAR_RANGE_FILENAME_LEN] = {'\0'};
404int __kmp_par_range_lb = 0;
405int __kmp_par_range_ub = INT_MAX;
406#endif /* KMP_DEBUG */
407
408/* For printing out dynamic storage map for threads and teams */
409int __kmp_storage_map =
410 FALSE; /* True means print storage map for threads and teams */
411int __kmp_storage_map_verbose =
412 FALSE; /* True means storage map includes placement info */
413int __kmp_storage_map_verbose_specified = FALSE;
414/* Initialize the library data structures when we fork a child process, defaults
415 * to TRUE */
416int __kmp_need_register_atfork =
417 TRUE; /* At initialization, call pthread_atfork to install fork handler */
418int __kmp_need_register_atfork_specified = TRUE;
419
420int __kmp_env_stksize = FALSE; /* KMP_STACKSIZE specified? */
421int __kmp_env_blocktime = FALSE; /* KMP_BLOCKTIME specified? */
422int __kmp_env_checks = FALSE; /* KMP_CHECKS specified? */
423int __kmp_env_consistency_check = FALSE; /* KMP_CONSISTENCY_CHECK specified? */
424
425// From KMP_USE_YIELD:
426// 0 = never yield;
427// 1 = always yield (default);
428// 2 = yield only if oversubscribed
429kmp_int32 __kmp_use_yield = 1;
430// This will be 1 if KMP_USE_YIELD environment variable was set explicitly
431kmp_int32 __kmp_use_yield_exp_set = 0;
432
433kmp_uint32 __kmp_yield_init = KMP_INIT_WAIT;
434kmp_uint32 __kmp_yield_next = KMP_NEXT_WAIT;
435kmp_uint64 __kmp_pause_init = 1; // for tpause
436
437/* ------------------------------------------------------ */
438/* STATE mostly syncronized with global lock */
439/* data written to rarely by primary threads, read often by workers */
440/* TODO: None of this global padding stuff works consistently because the order
441 of declaration is not necessarily correlated to storage order. To fix this,
442 all the important globals must be put in a big structure instead. */
443KMP_ALIGN_CACHE
444kmp_info_t **__kmp_threads = NULL;
445kmp_root_t **__kmp_root = NULL;
446
447/* data read/written to often by primary threads */
448KMP_ALIGN_CACHE
449volatile int __kmp_nth = 0;
450volatile int __kmp_all_nth = 0;
451volatile kmp_info_t *__kmp_thread_pool = NULL;
452volatile kmp_team_t *__kmp_team_pool = NULL;
453
454KMP_ALIGN_CACHE
455std::atomic<int> __kmp_thread_pool_active_nth = ATOMIC_VAR_INIT(0);
456
457/* -------------------------------------------------
458 * GLOBAL/ROOT STATE */
459KMP_ALIGN_CACHE
460kmp_global_t __kmp_global;
461
462/* ----------------------------------------------- */
463/* GLOBAL SYNCHRONIZATION LOCKS */
464/* TODO verify the need for these locks and if they need to be global */
465
466#if KMP_USE_INTERNODE_ALIGNMENT
467/* Multinode systems have larger cache line granularity which can cause
468 * false sharing if the alignment is not large enough for these locks */
469KMP_ALIGN_CACHE_INTERNODE
470
471KMP_BOOTSTRAP_LOCK_INIT(__kmp_initz_lock); /* Control initializations */
472KMP_ALIGN_CACHE_INTERNODE
473KMP_BOOTSTRAP_LOCK_INIT(__kmp_forkjoin_lock); /* control fork/join access */
474KMP_ALIGN_CACHE_INTERNODE
475KMP_BOOTSTRAP_LOCK_INIT(__kmp_exit_lock); /* exit() is not always thread-safe */
476#if KMP_USE_MONITOR
477/* control monitor thread creation */
478KMP_ALIGN_CACHE_INTERNODE
479KMP_BOOTSTRAP_LOCK_INIT(__kmp_monitor_lock);
480#endif
481/* used for the hack to allow threadprivate cache and __kmp_threads expansion
482 to co-exist */
483KMP_ALIGN_CACHE_INTERNODE
484KMP_BOOTSTRAP_LOCK_INIT(__kmp_tp_cached_lock);
485
486KMP_ALIGN_CACHE_INTERNODE
487KMP_LOCK_INIT(__kmp_global_lock); /* Control OS/global access */
488KMP_ALIGN_CACHE_INTERNODE
489kmp_queuing_lock_t __kmp_dispatch_lock; /* Control dispatch access */
490KMP_ALIGN_CACHE_INTERNODE
491KMP_LOCK_INIT(__kmp_debug_lock); /* Control I/O access for KMP_DEBUG */
492#else
493KMP_ALIGN_CACHE
494
495KMP_BOOTSTRAP_LOCK_INIT(__kmp_initz_lock); /* Control initializations */
496KMP_BOOTSTRAP_LOCK_INIT(__kmp_forkjoin_lock); /* control fork/join access */
497KMP_BOOTSTRAP_LOCK_INIT(__kmp_exit_lock); /* exit() is not always thread-safe */
498#if KMP_USE_MONITOR
499/* control monitor thread creation */
500KMP_BOOTSTRAP_LOCK_INIT(__kmp_monitor_lock);
501#endif
502/* used for the hack to allow threadprivate cache and __kmp_threads expansion
503 to co-exist */
504KMP_BOOTSTRAP_LOCK_INIT(__kmp_tp_cached_lock);
505
506KMP_ALIGN(128)
507KMP_LOCK_INIT(__kmp_global_lock); /* Control OS/global access */
508KMP_ALIGN(128)
509kmp_queuing_lock_t __kmp_dispatch_lock; /* Control dispatch access */
510KMP_ALIGN(128)
511KMP_LOCK_INIT(__kmp_debug_lock); /* Control I/O access for KMP_DEBUG */
512#endif
513
514/* ----------------------------------------------- */
515
516#if KMP_HANDLE_SIGNALS
517/* Signal handling is disabled by default, because it confuses users: In case of
518 sigsegv (or other trouble) in user code signal handler catches the signal,
519 which then "appears" in the monitor thread (when the monitor executes raise()
520 function). Users see signal in the monitor thread and blame OpenMP RTL.
521
522 Grant said signal handling required on some older OSes (Irix?) supported by
523 KAI, because bad applications hung but not aborted. Currently it is not a
524 problem for Linux* OS, OS X* and Windows* OS.
525
526 Grant: Found new hangs for EL4, EL5, and a Fedora Core machine. So I'm
527 putting the default back for now to see if that fixes hangs on those
528 machines.
529
530 2010-04013 Lev: It was a bug in Fortran RTL. Fortran RTL prints a kind of
531 stack backtrace when program is aborting, but the code is not signal-safe.
532 When multiple signals raised at the same time (which occurs in dynamic
533 negative tests because all the worker threads detects the same error),
534 Fortran RTL may hang. The bug finally fixed in Fortran RTL library provided
535 by Steve R., and will be available soon. */
536int __kmp_handle_signals = FALSE;
537#endif
538
539#ifdef DEBUG_SUSPEND
540int get_suspend_count_(void) {
541 int count = __kmp_suspend_count;
542 __kmp_suspend_count = 0;
543 return count;
544}
545void set_suspend_count_(int *value) { __kmp_suspend_count = *value; }
546#endif
547
548// Symbols for MS mutual detection.
549int _You_must_link_with_exactly_one_OpenMP_library = 1;
550int _You_must_link_with_Intel_OpenMP_library = 1;
551#if KMP_OS_WINDOWS && (KMP_VERSION_MAJOR > 4)
552int _You_must_link_with_Microsoft_OpenMP_library = 1;
553#endif
554
555kmp_target_offload_kind_t __kmp_target_offload = tgt_default;
556
557// OMP Pause Resources
558kmp_pause_status_t __kmp_pause_status = kmp_not_paused;
559
560// Nesting mode
561int __kmp_nesting_mode = 0;
562int __kmp_nesting_mode_nlevels = 1;
563int *__kmp_nesting_nth_level;
564
565// end of file //
sched_type
Definition kmp.h:357
@ kmp_sch_auto
Definition kmp.h:364
@ kmp_sch_default
Definition kmp.h:465
@ kmp_sch_guided_chunked
Definition kmp.h:362