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kmp_global.c
1 /*
2  * kmp_global.c -- KPTS global variables for runtime support library
3  */
4 
5 /* <copyright>
6  Copyright (c) 1997-2015 Intel Corporation. All Rights Reserved.
7 
8  Redistribution and use in source and binary forms, with or without
9  modification, are permitted provided that the following conditions
10  are met:
11 
12  * Redistributions of source code must retain the above copyright
13  notice, this list of conditions and the following disclaimer.
14  * Redistributions in binary form must reproduce the above copyright
15  notice, this list of conditions and the following disclaimer in the
16  documentation and/or other materials provided with the distribution.
17  * Neither the name of Intel Corporation nor the names of its
18  contributors may be used to endorse or promote products derived
19  from this software without specific prior written permission.
20 
21  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25  HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 
33 </copyright> */
34 
35 #include "kmp.h"
36 
37 #ifdef KMP_SETVERSION
38 char __kmp_setversion_string[] = VERSION_STRING;
39 #endif
40 
41 kmp_key_t __kmp_gtid_threadprivate_key;
42 
43 kmp_cpuinfo_t __kmp_cpuinfo = { 0 }; // Not initialized
44 
45 #if KMP_STATS_ENABLED
46 #include "kmp_stats.h"
47 // lock for modifying the global __kmp_stats_list
48 kmp_tas_lock_t __kmp_stats_lock = KMP_TAS_LOCK_INITIALIZER(__kmp_stats_lock);
49 
50 // global list of per thread stats, the head is a sentinel node which accumulates all stats produced before __kmp_create_worker is called.
51 kmp_stats_list __kmp_stats_list;
52 
53 // thread local pointer to stats node within list
54 __thread kmp_stats_list* __kmp_stats_thread_ptr = &__kmp_stats_list;
55 
56 // gives reference tick for all events (considered the 0 tick)
57 tsc_tick_count __kmp_stats_start_time;
58 #endif
59 
60 /* ----------------------------------------------------- */
61 /* INITIALIZATION VARIABLES */
62 /* they are syncronized to write during init, but read anytime */
63 volatile int __kmp_init_serial = FALSE;
64 volatile int __kmp_init_gtid = FALSE;
65 volatile int __kmp_init_common = FALSE;
66 volatile int __kmp_init_middle = FALSE;
67 volatile int __kmp_init_parallel = FALSE;
68 volatile int __kmp_init_monitor = 0; /* 1 - launched, 2 - actually started (Windows* OS only) */
69 volatile int __kmp_init_user_locks = FALSE;
70 
71 /* list of address of allocated caches for commons */
72 kmp_cached_addr_t *__kmp_threadpriv_cache_list = NULL;
73 
74 int __kmp_init_counter = 0;
75 int __kmp_root_counter = 0;
76 int __kmp_version = 0;
77 
78 volatile kmp_uint32 __kmp_team_counter = 0;
79 volatile kmp_uint32 __kmp_task_counter = 0;
80 
81 unsigned int __kmp_init_wait = KMP_DEFAULT_INIT_WAIT; /* initial number of spin-tests */
82 unsigned int __kmp_next_wait = KMP_DEFAULT_NEXT_WAIT; /* susequent number of spin-tests */
83 
84 size_t __kmp_stksize = KMP_DEFAULT_STKSIZE;
85 size_t __kmp_monitor_stksize = 0; // auto adjust
86 size_t __kmp_stkoffset = KMP_DEFAULT_STKOFFSET;
87 int __kmp_stkpadding = KMP_MIN_STKPADDING;
88 
89 size_t __kmp_malloc_pool_incr = KMP_DEFAULT_MALLOC_POOL_INCR;
90 
91 /* Barrier method defaults, settings, and strings */
92 /* branch factor = 2^branch_bits (only relevant for tree and hyper barrier types) */
93 #if KMP_ARCH_X86_64
94 kmp_uint32 __kmp_barrier_gather_bb_dflt = 2; /* branch_factor = 4 */ /* hyper2: C78980 */
95 kmp_uint32 __kmp_barrier_release_bb_dflt = 2; /* branch_factor = 4 */ /* hyper2: C78980 */
96 #else
97 kmp_uint32 __kmp_barrier_gather_bb_dflt = 2; /* branch_factor = 4 */ /* communication in core for MIC */
98 kmp_uint32 __kmp_barrier_release_bb_dflt = 2; /* branch_factor = 4 */ /* communication in core for MIC */
99 #endif // KMP_ARCH_X86_64
100 #if KMP_ARCH_X86_64
101 kmp_bar_pat_e __kmp_barrier_gather_pat_dflt = bp_hyper_bar; /* hyper2: C78980 */
102 kmp_bar_pat_e __kmp_barrier_release_pat_dflt = bp_hyper_bar; /* hyper2: C78980 */
103 #else
104 kmp_bar_pat_e __kmp_barrier_gather_pat_dflt = bp_linear_bar;
105 kmp_bar_pat_e __kmp_barrier_release_pat_dflt = bp_linear_bar;
106 #endif
107 kmp_uint32 __kmp_barrier_gather_branch_bits [ bs_last_barrier ] = { 0 };
108 kmp_uint32 __kmp_barrier_release_branch_bits [ bs_last_barrier ] = { 0 };
109 kmp_bar_pat_e __kmp_barrier_gather_pattern [ bs_last_barrier ] = { bp_linear_bar };
110 kmp_bar_pat_e __kmp_barrier_release_pattern [ bs_last_barrier ] = { bp_linear_bar };
111 char const *__kmp_barrier_branch_bit_env_name [ bs_last_barrier ] =
112  { "KMP_PLAIN_BARRIER", "KMP_FORKJOIN_BARRIER"
113  #if KMP_FAST_REDUCTION_BARRIER
114  , "KMP_REDUCTION_BARRIER"
115  #endif // KMP_FAST_REDUCTION_BARRIER
116  };
117 char const *__kmp_barrier_pattern_env_name [ bs_last_barrier ] =
118  { "KMP_PLAIN_BARRIER_PATTERN", "KMP_FORKJOIN_BARRIER_PATTERN"
119  #if KMP_FAST_REDUCTION_BARRIER
120  , "KMP_REDUCTION_BARRIER_PATTERN"
121  #endif // KMP_FAST_REDUCTION_BARRIER
122  };
123 char const *__kmp_barrier_type_name [ bs_last_barrier ] =
124  { "plain", "forkjoin"
125  #if KMP_FAST_REDUCTION_BARRIER
126  , "reduction"
127  #endif // KMP_FAST_REDUCTION_BARRIER
128  };
129 char const *__kmp_barrier_pattern_name [ bp_last_bar ] = { "linear", "tree", "hyper", "hierarchical" };
130 
131 
132 int __kmp_allThreadsSpecified = 0;
133 size_t __kmp_align_alloc = CACHE_LINE;
134 
135 
136 int __kmp_generate_warnings = kmp_warnings_low;
137 int __kmp_reserve_warn = 0;
138 int __kmp_xproc = 0;
139 int __kmp_avail_proc = 0;
140 size_t __kmp_sys_min_stksize = KMP_MIN_STKSIZE;
141 int __kmp_sys_max_nth = KMP_MAX_NTH;
142 int __kmp_max_nth = 0;
143 int __kmp_threads_capacity = 0;
144 int __kmp_dflt_team_nth = 0;
145 int __kmp_dflt_team_nth_ub = 0;
146 int __kmp_tp_capacity = 0;
147 int __kmp_tp_cached = 0;
148 int __kmp_dflt_nested = FALSE;
149 int __kmp_dflt_max_active_levels = KMP_MAX_ACTIVE_LEVELS_LIMIT; /* max_active_levels limit */
150 #if KMP_NESTED_HOT_TEAMS
151 int __kmp_hot_teams_mode = 0; /* 0 - free extra threads when reduced */
152  /* 1 - keep extra threads when reduced */
153 int __kmp_hot_teams_max_level = 1; /* nesting level of hot teams */
154 #endif
155 enum library_type __kmp_library = library_none;
156 enum sched_type __kmp_sched = kmp_sch_default; /* scheduling method for runtime scheduling */
157 enum sched_type __kmp_static = kmp_sch_static_greedy; /* default static scheduling method */
158 enum sched_type __kmp_guided = kmp_sch_guided_iterative_chunked; /* default guided scheduling method */
159 enum sched_type __kmp_auto = kmp_sch_guided_analytical_chunked; /* default auto scheduling method */
160 int __kmp_dflt_blocktime = KMP_DEFAULT_BLOCKTIME;
161 int __kmp_monitor_wakeups = KMP_MIN_MONITOR_WAKEUPS;
162 int __kmp_bt_intervals = KMP_INTERVALS_FROM_BLOCKTIME( KMP_DEFAULT_BLOCKTIME, KMP_MIN_MONITOR_WAKEUPS );
163 #ifdef KMP_ADJUST_BLOCKTIME
164 int __kmp_zero_bt = FALSE;
165 #endif /* KMP_ADJUST_BLOCKTIME */
166 #ifdef KMP_DFLT_NTH_CORES
167 int __kmp_ncores = 0;
168 #endif
169 int __kmp_chunk = 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 #if KMP_OS_WINDOWS
183 __declspec(thread) int __kmp_gtid = KMP_GTID_DNE;
184 #else
185 __thread int __kmp_gtid = KMP_GTID_DNE;
186 #endif /* KMP_OS_WINDOWS - workaround because Intel(R) Many Integrated Core compiler 20110316 doesn't accept __declspec */
187 #endif /* KMP_TDATA_GTID */
188 int __kmp_tls_gtid_min = INT_MAX;
189 int __kmp_foreign_tp = TRUE;
190 #if KMP_ARCH_X86 || KMP_ARCH_X86_64
191 int __kmp_inherit_fp_control = TRUE;
192 kmp_int16 __kmp_init_x87_fpu_control_word = 0;
193 kmp_uint32 __kmp_init_mxcsr = 0;
194 #endif /* KMP_ARCH_X86 || KMP_ARCH_X86_64 */
195 
196 #ifdef USE_LOAD_BALANCE
197 double __kmp_load_balance_interval = 1.0;
198 #endif /* USE_LOAD_BALANCE */
199 
200 kmp_nested_nthreads_t __kmp_nested_nth = { NULL, 0, 0 };
201 
202 #if KMP_USE_ADAPTIVE_LOCKS
203 
204 kmp_adaptive_backoff_params_t __kmp_adaptive_backoff_params = { 1, 1024 }; // TODO: tune it!
205 
206 #if KMP_DEBUG_ADAPTIVE_LOCKS
207 char * __kmp_speculative_statsfile = "-";
208 #endif
209 
210 #endif // KMP_USE_ADAPTIVE_LOCKS
211 
212 #if OMP_40_ENABLED
213 int __kmp_display_env = FALSE;
214 int __kmp_display_env_verbose = FALSE;
215 int __kmp_omp_cancellation = FALSE;
216 #endif
217 
218 /* map OMP 3.0 schedule types with our internal schedule types */
219 enum sched_type __kmp_sch_map[ kmp_sched_upper - kmp_sched_lower_ext + kmp_sched_upper_std - kmp_sched_lower - 2 ] = {
220  kmp_sch_static_chunked, // ==> kmp_sched_static = 1
221  kmp_sch_dynamic_chunked, // ==> kmp_sched_dynamic = 2
222  kmp_sch_guided_chunked, // ==> kmp_sched_guided = 3
223  kmp_sch_auto, // ==> kmp_sched_auto = 4
224  kmp_sch_trapezoidal // ==> kmp_sched_trapezoidal = 101
225  // will likely not used, introduced here just to debug the code
226  // of public intel extension schedules
227 };
228 
229 #if KMP_OS_LINUX
230 enum clock_function_type __kmp_clock_function;
231 int __kmp_clock_function_param;
232 #endif /* KMP_OS_LINUX */
233 
234 #if KMP_ARCH_X86_64 && (KMP_OS_LINUX || KMP_OS_WINDOWS)
235 enum mic_type __kmp_mic_type = non_mic;
236 #endif
237 
238 #if KMP_AFFINITY_SUPPORTED
239 
240 # if KMP_GROUP_AFFINITY
241 
242 int __kmp_num_proc_groups = 1;
243 
244 kmp_GetActiveProcessorCount_t __kmp_GetActiveProcessorCount = NULL;
245 kmp_GetActiveProcessorGroupCount_t __kmp_GetActiveProcessorGroupCount = NULL;
246 kmp_GetThreadGroupAffinity_t __kmp_GetThreadGroupAffinity = NULL;
247 kmp_SetThreadGroupAffinity_t __kmp_SetThreadGroupAffinity = NULL;
248 
249 # endif /* KMP_GROUP_AFFINITY */
250 
251 size_t __kmp_affin_mask_size = 0;
252 enum affinity_type __kmp_affinity_type = affinity_default;
253 enum affinity_gran __kmp_affinity_gran = affinity_gran_default;
254 int __kmp_affinity_gran_levels = -1;
255 int __kmp_affinity_dups = TRUE;
256 enum affinity_top_method __kmp_affinity_top_method = affinity_top_method_default;
257 int __kmp_affinity_compact = 0;
258 int __kmp_affinity_offset = 0;
259 int __kmp_affinity_verbose = FALSE;
260 int __kmp_affinity_warnings = TRUE;
261 int __kmp_affinity_respect_mask = affinity_respect_mask_default;
262 char * __kmp_affinity_proclist = NULL;
263 kmp_affin_mask_t *__kmp_affinity_masks = NULL;
264 unsigned __kmp_affinity_num_masks = 0;
265 
266 char const * __kmp_cpuinfo_file = NULL;
267 
268 #endif /* KMP_AFFINITY_SUPPORTED */
269 
270 #if OMP_40_ENABLED
271 kmp_nested_proc_bind_t __kmp_nested_proc_bind = { NULL, 0, 0 };
272 int __kmp_affinity_num_places = 0;
273 #endif
274 
275 int __kmp_place_num_cores = 0;
276 int __kmp_place_num_threads_per_core = 0;
277 int __kmp_place_core_offset = 0;
278 
279 kmp_tasking_mode_t __kmp_tasking_mode = tskm_task_teams;
280 
281 /* This check ensures that the compiler is passing the correct data type
282  * for the flags formal parameter of the function kmpc_omp_task_alloc().
283  * If the type is not a 4-byte type, then give an error message about
284  * a non-positive length array pointing here. If that happens, the
285  * kmp_tasking_flags_t structure must be redefined to have exactly 32 bits.
286  */
287 KMP_BUILD_ASSERT( sizeof(kmp_tasking_flags_t) == 4 );
288 
289 kmp_int32 __kmp_task_stealing_constraint = 1; /* Constrain task stealing by default */
290 
291 #ifdef DEBUG_SUSPEND
292 int __kmp_suspend_count = 0;
293 #endif
294 
295 int __kmp_settings = FALSE;
296 int __kmp_duplicate_library_ok = 0;
297 #if USE_ITT_BUILD
298 int __kmp_forkjoin_frames = 1;
299 int __kmp_forkjoin_frames_mode = 3;
300 #endif
301 PACKED_REDUCTION_METHOD_T __kmp_force_reduction_method = reduction_method_not_defined;
302 int __kmp_determ_red = FALSE;
303 
304 #ifdef KMP_DEBUG
305 int kmp_a_debug = 0;
306 int kmp_b_debug = 0;
307 int kmp_c_debug = 0;
308 int kmp_d_debug = 0;
309 int kmp_e_debug = 0;
310 int kmp_f_debug = 0;
311 int kmp_diag = 0;
312 #endif
313 
314 /* For debug information logging using rotating buffer */
315 int __kmp_debug_buf = FALSE; /* TRUE means use buffer, FALSE means print to stderr */
316 int __kmp_debug_buf_lines = KMP_DEBUG_BUF_LINES_INIT; /* Lines of debug stored in buffer */
317 int __kmp_debug_buf_chars = KMP_DEBUG_BUF_CHARS_INIT; /* Characters allowed per line in buffer */
318 int __kmp_debug_buf_atomic = FALSE; /* TRUE means use atomic update of buffer entry pointer */
319 
320 char *__kmp_debug_buffer = NULL; /* Debug buffer itself */
321 int __kmp_debug_count = 0; /* Counter for number of lines printed in buffer so far */
322 int __kmp_debug_buf_warn_chars = 0; /* Keep track of char increase recommended in warnings */
323 /* end rotating debug buffer */
324 
325 #ifdef KMP_DEBUG
326 int __kmp_par_range; /* +1 => only go par for constructs in range */
327  /* -1 => only go par for constructs outside range */
328 char __kmp_par_range_routine[KMP_PAR_RANGE_ROUTINE_LEN] = { '\0' };
329 char __kmp_par_range_filename[KMP_PAR_RANGE_FILENAME_LEN] = { '\0' };
330 int __kmp_par_range_lb = 0;
331 int __kmp_par_range_ub = INT_MAX;
332 #endif /* KMP_DEBUG */
333 
334 /* For printing out dynamic storage map for threads and teams */
335 int __kmp_storage_map = FALSE; /* True means print storage map for threads and teams */
336 int __kmp_storage_map_verbose = FALSE; /* True means storage map includes placement info */
337 int __kmp_storage_map_verbose_specified = FALSE;
338 /* Initialize the library data structures when we fork a child process, defaults to TRUE */
339 int __kmp_need_register_atfork = TRUE; /* At initialization, call pthread_atfork to install fork handler */
340 int __kmp_need_register_atfork_specified = TRUE;
341 
342 
343 int __kmp_env_chunk = FALSE; /* KMP_CHUNK specified? */
344 int __kmp_env_stksize = FALSE; /* KMP_STACKSIZE specified? */
345 int __kmp_env_omp_stksize = FALSE; /* OMP_STACKSIZE specified? */
346 int __kmp_env_all_threads = FALSE;/* KMP_ALL_THREADS or KMP_MAX_THREADS specified? */
347 int __kmp_env_omp_all_threads = FALSE;/* OMP_THREAD_LIMIT specified? */
348 int __kmp_env_blocktime = FALSE; /* KMP_BLOCKTIME specified? */
349 int __kmp_env_checks = FALSE; /* KMP_CHECKS specified? */
350 int __kmp_env_consistency_check = FALSE; /* KMP_CONSISTENCY_CHECK specified? */
351 
352 kmp_uint32 __kmp_yield_init = KMP_INIT_WAIT;
353 kmp_uint32 __kmp_yield_next = KMP_NEXT_WAIT;
354 kmp_uint32 __kmp_yielding_on = 1;
355 #if KMP_OS_CNK
356 kmp_uint32 __kmp_yield_cycle = 0;
357 #else
358 kmp_uint32 __kmp_yield_cycle = 1; /* Yield-cycle is on by default */
359 #endif
360 kmp_int32 __kmp_yield_on_count = 10; /* By default, yielding is on for 10 monitor periods. */
361 kmp_int32 __kmp_yield_off_count = 1; /* By default, yielding is off for 1 monitor periods. */
362 /* ----------------------------------------------------- */
363 
364 
365 /* ------------------------------------------------------ */
366 /* STATE mostly syncronized with global lock */
367 /* data written to rarely by masters, read often by workers */
368 /*
369  * SHALL WE EDIT THE COMMENT BELOW IN SOME WAY?
370  * TODO: None of this global padding stuff works consistently because
371  * the order of declaration is not necessarily correlated to storage order.
372  * To fix this, all the important globals must be put in a big structure
373  * instead.
374  */
375 KMP_ALIGN_CACHE
376  kmp_info_t **__kmp_threads = NULL;
377  kmp_root_t **__kmp_root = NULL;
378 
379 /* data read/written to often by masters */
380 KMP_ALIGN_CACHE
381 volatile int __kmp_nth = 0;
382 volatile int __kmp_all_nth = 0;
383 int __kmp_thread_pool_nth = 0;
384 volatile kmp_info_t *__kmp_thread_pool = NULL;
385 volatile kmp_team_t *__kmp_team_pool = NULL;
386 
387 KMP_ALIGN_CACHE
388 volatile int __kmp_thread_pool_active_nth = 0;
389 
390 /* -------------------------------------------------
391  * GLOBAL/ROOT STATE */
392 KMP_ALIGN_CACHE
393 kmp_global_t __kmp_global = {{ 0 }};
394 
395 /* ----------------------------------------------- */
396 /* GLOBAL SYNCHRONIZATION LOCKS */
397 /* TODO verify the need for these locks and if they need to be global */
398 
399 #if KMP_USE_INTERNODE_ALIGNMENT
400 /* Multinode systems have larger cache line granularity which can cause
401  * false sharing if the alignment is not large enough for these locks */
402 KMP_ALIGN_CACHE_INTERNODE
403 
404 kmp_bootstrap_lock_t __kmp_initz_lock = KMP_BOOTSTRAP_LOCK_INITIALIZER( __kmp_initz_lock ); /* Control initializations */
405 KMP_ALIGN_CACHE_INTERNODE
406 kmp_bootstrap_lock_t __kmp_forkjoin_lock; /* control fork/join access */
407 KMP_ALIGN_CACHE_INTERNODE
408 kmp_bootstrap_lock_t __kmp_exit_lock; /* exit() is not always thread-safe */
409 KMP_ALIGN_CACHE_INTERNODE
410 kmp_bootstrap_lock_t __kmp_monitor_lock; /* control monitor thread creation */
411 KMP_ALIGN_CACHE_INTERNODE
412 kmp_bootstrap_lock_t __kmp_tp_cached_lock; /* used for the hack to allow threadprivate cache and __kmp_threads expansion to co-exist */
413 
414 KMP_ALIGN_CACHE_INTERNODE
415 kmp_lock_t __kmp_global_lock; /* Control OS/global access */
416 KMP_ALIGN_CACHE_INTERNODE
417 kmp_queuing_lock_t __kmp_dispatch_lock; /* Control dispatch access */
418 KMP_ALIGN_CACHE_INTERNODE
419 kmp_lock_t __kmp_debug_lock; /* Control I/O access for KMP_DEBUG */
420 #else
421 KMP_ALIGN_CACHE
422 
423 kmp_bootstrap_lock_t __kmp_initz_lock = KMP_BOOTSTRAP_LOCK_INITIALIZER( __kmp_initz_lock ); /* Control initializations */
424 kmp_bootstrap_lock_t __kmp_forkjoin_lock; /* control fork/join access */
425 kmp_bootstrap_lock_t __kmp_exit_lock; /* exit() is not always thread-safe */
426 kmp_bootstrap_lock_t __kmp_monitor_lock; /* control monitor thread creation */
427 kmp_bootstrap_lock_t __kmp_tp_cached_lock; /* used for the hack to allow threadprivate cache and __kmp_threads expansion to co-exist */
428 
429 KMP_ALIGN(128)
430 kmp_lock_t __kmp_global_lock; /* Control OS/global access */
431 KMP_ALIGN(128)
432 kmp_queuing_lock_t __kmp_dispatch_lock; /* Control dispatch access */
433 KMP_ALIGN(128)
434 kmp_lock_t __kmp_debug_lock; /* Control I/O access for KMP_DEBUG */
435 #endif
436 
437 /* ----------------------------------------------- */
438 
439 #if KMP_HANDLE_SIGNALS
440  /*
441  Signal handling is disabled by default, because it confuses users: In case of sigsegv
442  (or other trouble) in user code signal handler catches the signal, which then "appears" in
443  the monitor thread (when the monitor executes raise() function). Users see signal in the
444  monitor thread and blame OpenMP RTL.
445 
446  Grant said signal handling required on some older OSes (Irix?) supported by KAI, because
447  bad applications hung but not aborted. Currently it is not a problem for Linux* OS, OS X* and
448  Windows* OS.
449 
450  Grant: Found new hangs for EL4, EL5, and a Fedora Core machine. So I'm putting
451  the default back for now to see if that fixes hangs on those machines.
452 
453  2010-04013 Lev: It was a bug in Fortran RTL. Fortran RTL prints a kind of stack backtrace
454  when program is aborting, but the code is not signal-safe. When multiple signals raised at
455  the same time (which occurs in dynamic negative tests because all the worker threads detects
456  the same error), Fortran RTL may hang. The bug finally fixed in Fortran RTL library provided
457  by Steve R., and will be available soon.
458  */
459  int __kmp_handle_signals = FALSE;
460 #endif
461 
462 /* ----------------------------------------------- */
463 #ifdef BUILD_TV
464 kmp_key_t __kmp_tv_key = 0;
465 #endif
466 
467 /* ------------------------------------------------------------------------ */
468 /* ------------------------------------------------------------------------ */
469 
470 #ifdef DEBUG_SUSPEND
471 int
472 get_suspend_count_( void ) {
473  int count = __kmp_suspend_count;
474  __kmp_suspend_count = 0;
475  return count;
476 }
477 void
478 set_suspend_count_( int * value ) {
479  __kmp_suspend_count = *value;
480 }
481 #endif
482 
483 // Symbols for MS mutual detection.
484 int _You_must_link_with_exactly_one_OpenMP_library = 1;
485 int _You_must_link_with_Intel_OpenMP_library = 1;
486 #if KMP_OS_WINDOWS && ( KMP_VERSION_MAJOR > 4 )
487  int _You_must_link_with_Microsoft_OpenMP_library = 1;
488 #endif
489 
490 // end of file //
sched_type
Definition: kmp.h:323