Intel® OpenMP* Runtime Library
 All Classes Functions Variables Typedefs Enumerations Enumerator Modules Pages
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 int __kmp_allThreadsSpecified = 0;
132 size_t __kmp_align_alloc = CACHE_LINE;
133 
134 
135 int __kmp_generate_warnings = kmp_warnings_low;
136 int __kmp_reserve_warn = 0;
137 int __kmp_xproc = 0;
138 int __kmp_avail_proc = 0;
139 size_t __kmp_sys_min_stksize = KMP_MIN_STKSIZE;
140 int __kmp_sys_max_nth = KMP_MAX_NTH;
141 int __kmp_max_nth = 0;
142 int __kmp_threads_capacity = 0;
143 int __kmp_dflt_team_nth = 0;
144 int __kmp_dflt_team_nth_ub = 0;
145 int __kmp_tp_capacity = 0;
146 int __kmp_tp_cached = 0;
147 int __kmp_dflt_nested = FALSE;
148 int __kmp_dflt_max_active_levels = KMP_MAX_ACTIVE_LEVELS_LIMIT; /* max_active_levels limit */
149 #if KMP_NESTED_HOT_TEAMS
150 int __kmp_hot_teams_mode = 0; /* 0 - free extra threads when reduced */
151  /* 1 - keep extra threads when reduced */
152 int __kmp_hot_teams_max_level = 1; /* nesting level of hot teams */
153 #endif
154 enum library_type __kmp_library = library_none;
155 enum sched_type __kmp_sched = kmp_sch_default; /* scheduling method for runtime scheduling */
156 enum sched_type __kmp_static = kmp_sch_static_greedy; /* default static scheduling method */
157 enum sched_type __kmp_guided = kmp_sch_guided_iterative_chunked; /* default guided scheduling method */
158 enum sched_type __kmp_auto = kmp_sch_guided_analytical_chunked; /* default auto scheduling method */
159 int __kmp_dflt_blocktime = KMP_DEFAULT_BLOCKTIME;
160 int __kmp_monitor_wakeups = KMP_MIN_MONITOR_WAKEUPS;
161 int __kmp_bt_intervals = KMP_INTERVALS_FROM_BLOCKTIME( KMP_DEFAULT_BLOCKTIME, KMP_MIN_MONITOR_WAKEUPS );
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_abort_delay = 0;
170 #if KMP_OS_LINUX && defined(KMP_TDATA_GTID)
171 int __kmp_gtid_mode = 3; /* use __declspec(thread) TLS to store gtid */
172 int __kmp_adjust_gtid_mode = FALSE;
173 #elif KMP_OS_WINDOWS
174 int __kmp_gtid_mode = 2; /* use TLS functions to store gtid */
175 int __kmp_adjust_gtid_mode = FALSE;
176 #else
177 int __kmp_gtid_mode = 0; /* select method to get gtid based on #threads */
178 int __kmp_adjust_gtid_mode = TRUE;
179 #endif /* KMP_OS_LINUX && defined(KMP_TDATA_GTID) */
180 #ifdef KMP_TDATA_GTID
181 #if KMP_OS_WINDOWS
182 __declspec(thread) int __kmp_gtid = KMP_GTID_DNE;
183 #else
184 __thread int __kmp_gtid = KMP_GTID_DNE;
185 #endif /* KMP_OS_WINDOWS - workaround because Intel(R) Many Integrated Core compiler 20110316 doesn't accept __declspec */
186 #endif /* KMP_TDATA_GTID */
187 int __kmp_tls_gtid_min = INT_MAX;
188 int __kmp_foreign_tp = TRUE;
189 #if KMP_ARCH_X86 || KMP_ARCH_X86_64
190 int __kmp_inherit_fp_control = TRUE;
191 kmp_int16 __kmp_init_x87_fpu_control_word = 0;
192 kmp_uint32 __kmp_init_mxcsr = 0;
193 #endif /* KMP_ARCH_X86 || KMP_ARCH_X86_64 */
194 
195 #ifdef USE_LOAD_BALANCE
196 double __kmp_load_balance_interval = 1.0;
197 #endif /* USE_LOAD_BALANCE */
198 
199 kmp_nested_nthreads_t __kmp_nested_nth = { NULL, 0, 0 };
200 
201 #if KMP_USE_ADAPTIVE_LOCKS
202 
203 kmp_adaptive_backoff_params_t __kmp_adaptive_backoff_params = { 1, 1024 }; // TODO: tune it!
204 
205 #if KMP_DEBUG_ADAPTIVE_LOCKS
206 char * __kmp_speculative_statsfile = "-";
207 #endif
208 
209 #endif // KMP_USE_ADAPTIVE_LOCKS
210 
211 #if OMP_40_ENABLED
212 int __kmp_display_env = FALSE;
213 int __kmp_display_env_verbose = FALSE;
214 int __kmp_omp_cancellation = FALSE;
215 #endif
216 
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_sockets = 0;
276 int __kmp_place_socket_offset = 0;
277 int __kmp_place_num_cores = 0;
278 int __kmp_place_core_offset = 0;
279 int __kmp_place_num_threads_per_core = 0;
280 
281 kmp_tasking_mode_t __kmp_tasking_mode = tskm_task_teams;
282 
283 /* This check ensures that the compiler is passing the correct data type
284  * for the flags formal parameter of the function kmpc_omp_task_alloc().
285  * If the type is not a 4-byte type, then give an error message about
286  * a non-positive length array pointing here. If that happens, the
287  * kmp_tasking_flags_t structure must be redefined to have exactly 32 bits.
288  */
289 KMP_BUILD_ASSERT( sizeof(kmp_tasking_flags_t) == 4 );
290 
291 kmp_int32 __kmp_task_stealing_constraint = 1; /* Constrain task stealing by default */
292 
293 #ifdef DEBUG_SUSPEND
294 int __kmp_suspend_count = 0;
295 #endif
296 
297 int __kmp_settings = FALSE;
298 int __kmp_duplicate_library_ok = 0;
299 #if USE_ITT_BUILD
300 int __kmp_forkjoin_frames = 1;
301 int __kmp_forkjoin_frames_mode = 3;
302 #endif
303 PACKED_REDUCTION_METHOD_T __kmp_force_reduction_method = reduction_method_not_defined;
304 int __kmp_determ_red = FALSE;
305 
306 #ifdef KMP_DEBUG
307 int kmp_a_debug = 0;
308 int kmp_b_debug = 0;
309 int kmp_c_debug = 0;
310 int kmp_d_debug = 0;
311 int kmp_e_debug = 0;
312 int kmp_f_debug = 0;
313 int kmp_diag = 0;
314 #endif
315 
316 /* For debug information logging using rotating buffer */
317 int __kmp_debug_buf = FALSE; /* TRUE means use buffer, FALSE means print to stderr */
318 int __kmp_debug_buf_lines = KMP_DEBUG_BUF_LINES_INIT; /* Lines of debug stored in buffer */
319 int __kmp_debug_buf_chars = KMP_DEBUG_BUF_CHARS_INIT; /* Characters allowed per line in buffer */
320 int __kmp_debug_buf_atomic = FALSE; /* TRUE means use atomic update of buffer entry pointer */
321 
322 char *__kmp_debug_buffer = NULL; /* Debug buffer itself */
323 int __kmp_debug_count = 0; /* Counter for number of lines printed in buffer so far */
324 int __kmp_debug_buf_warn_chars = 0; /* Keep track of char increase recommended in warnings */
325 /* end rotating debug buffer */
326 
327 #ifdef KMP_DEBUG
328 int __kmp_par_range; /* +1 => only go par for constructs in range */
329  /* -1 => only go par for constructs outside range */
330 char __kmp_par_range_routine[KMP_PAR_RANGE_ROUTINE_LEN] = { '\0' };
331 char __kmp_par_range_filename[KMP_PAR_RANGE_FILENAME_LEN] = { '\0' };
332 int __kmp_par_range_lb = 0;
333 int __kmp_par_range_ub = INT_MAX;
334 #endif /* KMP_DEBUG */
335 
336 /* For printing out dynamic storage map for threads and teams */
337 int __kmp_storage_map = FALSE; /* True means print storage map for threads and teams */
338 int __kmp_storage_map_verbose = FALSE; /* True means storage map includes placement info */
339 int __kmp_storage_map_verbose_specified = FALSE;
340 /* Initialize the library data structures when we fork a child process, defaults to TRUE */
341 int __kmp_need_register_atfork = TRUE; /* At initialization, call pthread_atfork to install fork handler */
342 int __kmp_need_register_atfork_specified = TRUE;
343 
344 
345 int __kmp_env_chunk = FALSE; /* KMP_CHUNK specified? */
346 int __kmp_env_stksize = FALSE; /* KMP_STACKSIZE specified? */
347 int __kmp_env_omp_stksize = FALSE; /* OMP_STACKSIZE specified? */
348 int __kmp_env_all_threads = FALSE;/* KMP_ALL_THREADS or KMP_MAX_THREADS specified? */
349 int __kmp_env_omp_all_threads = FALSE;/* OMP_THREAD_LIMIT specified? */
350 int __kmp_env_blocktime = FALSE; /* KMP_BLOCKTIME specified? */
351 int __kmp_env_checks = FALSE; /* KMP_CHECKS specified? */
352 int __kmp_env_consistency_check = FALSE; /* KMP_CONSISTENCY_CHECK specified? */
353 
354 kmp_uint32 __kmp_yield_init = KMP_INIT_WAIT;
355 kmp_uint32 __kmp_yield_next = KMP_NEXT_WAIT;
356 kmp_uint32 __kmp_yielding_on = 1;
357 #if KMP_OS_CNK
358 kmp_uint32 __kmp_yield_cycle = 0;
359 #else
360 kmp_uint32 __kmp_yield_cycle = 1; /* Yield-cycle is on by default */
361 #endif
362 kmp_int32 __kmp_yield_on_count = 10; /* By default, yielding is on for 10 monitor periods. */
363 kmp_int32 __kmp_yield_off_count = 1; /* By default, yielding is off for 1 monitor periods. */
364 /* ----------------------------------------------------- */
365 
366 
367 /* ------------------------------------------------------ */
368 /* STATE mostly syncronized with global lock */
369 /* data written to rarely by masters, read often by workers */
370 /*
371  * SHALL WE EDIT THE COMMENT BELOW IN SOME WAY?
372  * TODO: None of this global padding stuff works consistently because
373  * the order of declaration is not necessarily correlated to storage order.
374  * To fix this, all the important globals must be put in a big structure
375  * instead.
376  */
377 KMP_ALIGN_CACHE
378  kmp_info_t **__kmp_threads = NULL;
379  kmp_root_t **__kmp_root = NULL;
380 
381 /* data read/written to often by masters */
382 KMP_ALIGN_CACHE
383 volatile int __kmp_nth = 0;
384 volatile int __kmp_all_nth = 0;
385 int __kmp_thread_pool_nth = 0;
386 volatile kmp_info_t *__kmp_thread_pool = NULL;
387 volatile kmp_team_t *__kmp_team_pool = NULL;
388 
389 KMP_ALIGN_CACHE
390 volatile int __kmp_thread_pool_active_nth = 0;
391 
392 /* -------------------------------------------------
393  * GLOBAL/ROOT STATE */
394 KMP_ALIGN_CACHE
395 kmp_global_t __kmp_global = {{ 0 }};
396 
397 /* ----------------------------------------------- */
398 /* GLOBAL SYNCHRONIZATION LOCKS */
399 /* TODO verify the need for these locks and if they need to be global */
400 
401 #if KMP_USE_INTERNODE_ALIGNMENT
402 /* Multinode systems have larger cache line granularity which can cause
403  * false sharing if the alignment is not large enough for these locks */
404 KMP_ALIGN_CACHE_INTERNODE
405 
406 kmp_bootstrap_lock_t __kmp_initz_lock = KMP_BOOTSTRAP_LOCK_INITIALIZER( __kmp_initz_lock ); /* Control initializations */
407 KMP_ALIGN_CACHE_INTERNODE
408 kmp_bootstrap_lock_t __kmp_forkjoin_lock; /* control fork/join access */
409 KMP_ALIGN_CACHE_INTERNODE
410 kmp_bootstrap_lock_t __kmp_exit_lock; /* exit() is not always thread-safe */
411 KMP_ALIGN_CACHE_INTERNODE
412 kmp_bootstrap_lock_t __kmp_monitor_lock; /* control monitor thread creation */
413 KMP_ALIGN_CACHE_INTERNODE
414 kmp_bootstrap_lock_t __kmp_tp_cached_lock; /* used for the hack to allow threadprivate cache and __kmp_threads expansion to co-exist */
415 
416 KMP_ALIGN_CACHE_INTERNODE
417 kmp_lock_t __kmp_global_lock; /* Control OS/global access */
418 KMP_ALIGN_CACHE_INTERNODE
419 kmp_queuing_lock_t __kmp_dispatch_lock; /* Control dispatch access */
420 KMP_ALIGN_CACHE_INTERNODE
421 kmp_lock_t __kmp_debug_lock; /* Control I/O access for KMP_DEBUG */
422 #else
423 KMP_ALIGN_CACHE
424 
425 kmp_bootstrap_lock_t __kmp_initz_lock = KMP_BOOTSTRAP_LOCK_INITIALIZER( __kmp_initz_lock ); /* Control initializations */
426 kmp_bootstrap_lock_t __kmp_forkjoin_lock; /* control fork/join access */
427 kmp_bootstrap_lock_t __kmp_exit_lock; /* exit() is not always thread-safe */
428 kmp_bootstrap_lock_t __kmp_monitor_lock; /* control monitor thread creation */
429 kmp_bootstrap_lock_t __kmp_tp_cached_lock; /* used for the hack to allow threadprivate cache and __kmp_threads expansion to co-exist */
430 
431 KMP_ALIGN(128)
432 kmp_lock_t __kmp_global_lock; /* Control OS/global access */
433 KMP_ALIGN(128)
434 kmp_queuing_lock_t __kmp_dispatch_lock; /* Control dispatch access */
435 KMP_ALIGN(128)
436 kmp_lock_t __kmp_debug_lock; /* Control I/O access for KMP_DEBUG */
437 #endif
438 
439 /* ----------------------------------------------- */
440 
441 #if KMP_HANDLE_SIGNALS
442  /*
443  Signal handling is disabled by default, because it confuses users: In case of sigsegv
444  (or other trouble) in user code signal handler catches the signal, which then "appears" in
445  the monitor thread (when the monitor executes raise() function). Users see signal in the
446  monitor thread and blame OpenMP RTL.
447 
448  Grant said signal handling required on some older OSes (Irix?) supported by KAI, because
449  bad applications hung but not aborted. Currently it is not a problem for Linux* OS, OS X* and
450  Windows* OS.
451 
452  Grant: Found new hangs for EL4, EL5, and a Fedora Core machine. So I'm putting
453  the default back for now to see if that fixes hangs on those machines.
454 
455  2010-04013 Lev: It was a bug in Fortran RTL. Fortran RTL prints a kind of stack backtrace
456  when program is aborting, but the code is not signal-safe. When multiple signals raised at
457  the same time (which occurs in dynamic negative tests because all the worker threads detects
458  the same error), Fortran RTL may hang. The bug finally fixed in Fortran RTL library provided
459  by Steve R., and will be available soon.
460  */
461  int __kmp_handle_signals = FALSE;
462 #endif
463 
464 /* ----------------------------------------------- */
465 #ifdef BUILD_TV
466 kmp_key_t __kmp_tv_key = 0;
467 #endif
468 
469 /* ------------------------------------------------------------------------ */
470 /* ------------------------------------------------------------------------ */
471 
472 #ifdef DEBUG_SUSPEND
473 int
474 get_suspend_count_( void ) {
475  int count = __kmp_suspend_count;
476  __kmp_suspend_count = 0;
477  return count;
478 }
479 void
480 set_suspend_count_( int * value ) {
481  __kmp_suspend_count = *value;
482 }
483 #endif
484 
485 // Symbols for MS mutual detection.
486 int _You_must_link_with_exactly_one_OpenMP_library = 1;
487 int _You_must_link_with_Intel_OpenMP_library = 1;
488 #if KMP_OS_WINDOWS && ( KMP_VERSION_MAJOR > 4 )
489  int _You_must_link_with_Microsoft_OpenMP_library = 1;
490 #endif
491 
492 // end of file //
sched_type
Definition: kmp.h:320