LLVM OpenMP* Runtime Library
ompt-general.cpp
1 /*
2  * ompt-general.cpp -- OMPT implementation of interface functions
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 /*****************************************************************************
14  * system include files
15  ****************************************************************************/
16 
17 #include <assert.h>
18 
19 #include <stdint.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #if KMP_OS_UNIX
24 #include <dlfcn.h>
25 #endif
26 
27 /*****************************************************************************
28  * ompt include files
29  ****************************************************************************/
30 
31 #include "ompt-specific.cpp"
32 
33 /*****************************************************************************
34  * macros
35  ****************************************************************************/
36 
37 #define ompt_get_callback_success 1
38 #define ompt_get_callback_failure 0
39 
40 #define no_tool_present 0
41 
42 #define OMPT_API_ROUTINE static
43 
44 #ifndef OMPT_STR_MATCH
45 #define OMPT_STR_MATCH(haystack, needle) (!strcasecmp(haystack, needle))
46 #endif
47 
48 /*****************************************************************************
49  * types
50  ****************************************************************************/
51 
52 typedef struct {
53  const char *state_name;
54  ompt_state_t state_id;
55 } ompt_state_info_t;
56 
57 typedef struct {
58  const char *name;
59  kmp_mutex_impl_t id;
60 } kmp_mutex_impl_info_t;
61 
62 enum tool_setting_e {
63  omp_tool_error,
64  omp_tool_unset,
65  omp_tool_disabled,
66  omp_tool_enabled
67 };
68 
69 /*****************************************************************************
70  * global variables
71  ****************************************************************************/
72 
73 ompt_callbacks_active_t ompt_enabled;
74 
75 ompt_state_info_t ompt_state_info[] = {
76 #define ompt_state_macro(state, code) {#state, state},
77  FOREACH_OMPT_STATE(ompt_state_macro)
78 #undef ompt_state_macro
79 };
80 
81 kmp_mutex_impl_info_t kmp_mutex_impl_info[] = {
82 #define kmp_mutex_impl_macro(name, id) {#name, name},
83  FOREACH_KMP_MUTEX_IMPL(kmp_mutex_impl_macro)
84 #undef kmp_mutex_impl_macro
85 };
86 
87 ompt_callbacks_internal_t ompt_callbacks;
88 
89 static ompt_start_tool_result_t *ompt_start_tool_result = NULL;
90 
91 /*****************************************************************************
92  * forward declarations
93  ****************************************************************************/
94 
95 static ompt_interface_fn_t ompt_fn_lookup(const char *s);
96 
97 OMPT_API_ROUTINE ompt_data_t *ompt_get_thread_data(void);
98 
99 /*****************************************************************************
100  * initialization and finalization (private operations)
101  ****************************************************************************/
102 
103 typedef ompt_start_tool_result_t *(*ompt_start_tool_t)(unsigned int,
104  const char *);
105 
106 #if KMP_OS_DARWIN
107 
108 // While Darwin supports weak symbols, the library that wishes to provide a new
109 // implementation has to link against this runtime which defeats the purpose
110 // of having tools that are agnostic of the underlying runtime implementation.
111 //
112 // Fortunately, the linker includes all symbols of an executable in the global
113 // symbol table by default so dlsym() even finds static implementations of
114 // ompt_start_tool. For this to work on Linux, -Wl,--export-dynamic needs to be
115 // passed when building the application which we don't want to rely on.
116 
117 static ompt_start_tool_result_t *ompt_tool_darwin(unsigned int omp_version,
118  const char *runtime_version) {
119  ompt_start_tool_result_t *ret = NULL;
120  // Search symbol in the current address space.
121  ompt_start_tool_t start_tool =
122  (ompt_start_tool_t)dlsym(RTLD_DEFAULT, "ompt_start_tool");
123  if (start_tool) {
124  ret = start_tool(omp_version, runtime_version);
125  }
126  return ret;
127 }
128 
129 #elif OMPT_HAVE_WEAK_ATTRIBUTE
130 
131 // On Unix-like systems that support weak symbols the following implementation
132 // of ompt_start_tool() will be used in case no tool-supplied implementation of
133 // this function is present in the address space of a process.
134 
135 _OMP_EXTERN OMPT_WEAK_ATTRIBUTE ompt_start_tool_result_t *
136 ompt_start_tool(unsigned int omp_version, const char *runtime_version) {
137  ompt_start_tool_result_t *ret = NULL;
138  // Search next symbol in the current address space. This can happen if the
139  // runtime library is linked before the tool. Since glibc 2.2 strong symbols
140  // don't override weak symbols that have been found before unless the user
141  // sets the environment variable LD_DYNAMIC_WEAK.
142  ompt_start_tool_t next_tool =
143  (ompt_start_tool_t)dlsym(RTLD_NEXT, "ompt_start_tool");
144  if (next_tool) {
145  ret = next_tool(omp_version, runtime_version);
146  }
147  return ret;
148 }
149 
150 #elif OMPT_HAVE_PSAPI
151 
152 // On Windows, the ompt_tool_windows function is used to find the
153 // ompt_start_tool symbol across all modules loaded by a process. If
154 // ompt_start_tool is found, ompt_start_tool's return value is used to
155 // initialize the tool. Otherwise, NULL is returned and OMPT won't be enabled.
156 
157 #include <psapi.h>
158 #pragma comment(lib, "psapi.lib")
159 
160 // The number of loaded modules to start enumeration with EnumProcessModules()
161 #define NUM_MODULES 128
162 
163 static ompt_start_tool_result_t *
164 ompt_tool_windows(unsigned int omp_version, const char *runtime_version) {
165  int i;
166  DWORD needed, new_size;
167  HMODULE *modules;
168  HANDLE process = GetCurrentProcess();
169  modules = (HMODULE *)malloc(NUM_MODULES * sizeof(HMODULE));
170  ompt_start_tool_t ompt_tool_p = NULL;
171 
172 #if OMPT_DEBUG
173  printf("ompt_tool_windows(): looking for ompt_start_tool\n");
174 #endif
175  if (!EnumProcessModules(process, modules, NUM_MODULES * sizeof(HMODULE),
176  &needed)) {
177  // Regardless of the error reason use the stub initialization function
178  free(modules);
179  return NULL;
180  }
181  // Check if NUM_MODULES is enough to list all modules
182  new_size = needed / sizeof(HMODULE);
183  if (new_size > NUM_MODULES) {
184 #if OMPT_DEBUG
185  printf("ompt_tool_windows(): resize buffer to %d bytes\n", needed);
186 #endif
187  modules = (HMODULE *)realloc(modules, needed);
188  // If resizing failed use the stub function.
189  if (!EnumProcessModules(process, modules, needed, &needed)) {
190  free(modules);
191  return NULL;
192  }
193  }
194  for (i = 0; i < new_size; ++i) {
195  (FARPROC &)ompt_tool_p = GetProcAddress(modules[i], "ompt_start_tool");
196  if (ompt_tool_p) {
197 #if OMPT_DEBUG
198  TCHAR modName[MAX_PATH];
199  if (GetModuleFileName(modules[i], modName, MAX_PATH))
200  printf("ompt_tool_windows(): ompt_start_tool found in module %s\n",
201  modName);
202 #endif
203  free(modules);
204  return (*ompt_tool_p)(omp_version, runtime_version);
205  }
206 #if OMPT_DEBUG
207  else {
208  TCHAR modName[MAX_PATH];
209  if (GetModuleFileName(modules[i], modName, MAX_PATH))
210  printf("ompt_tool_windows(): ompt_start_tool not found in module %s\n",
211  modName);
212  }
213 #endif
214  }
215  free(modules);
216  return NULL;
217 }
218 #else
219 #error Activation of OMPT is not supported on this platform.
220 #endif
221 
222 static ompt_start_tool_result_t *
223 ompt_try_start_tool(unsigned int omp_version, const char *runtime_version) {
224  ompt_start_tool_result_t *ret = NULL;
225  ompt_start_tool_t start_tool = NULL;
226 #if KMP_OS_WINDOWS
227  // Cannot use colon to describe a list of absolute paths on Windows
228  const char *sep = ";";
229 #else
230  const char *sep = ":";
231 #endif
232 
233 #if KMP_OS_DARWIN
234  // Try in the current address space
235  ret = ompt_tool_darwin(omp_version, runtime_version);
236 #elif OMPT_HAVE_WEAK_ATTRIBUTE
237  ret = ompt_start_tool(omp_version, runtime_version);
238 #elif OMPT_HAVE_PSAPI
239  ret = ompt_tool_windows(omp_version, runtime_version);
240 #else
241 #error Activation of OMPT is not supported on this platform.
242 #endif
243  if (ret)
244  return ret;
245 
246  // Try tool-libraries-var ICV
247  const char *tool_libs = getenv("OMP_TOOL_LIBRARIES");
248  if (tool_libs) {
249  char *libs = __kmp_str_format("%s", tool_libs);
250  char *buf;
251  char *fname = __kmp_str_token(libs, sep, &buf);
252  while (fname) {
253 #if KMP_OS_UNIX
254  void *h = dlopen(fname, RTLD_LAZY);
255  if (h) {
256  start_tool = (ompt_start_tool_t)dlsym(h, "ompt_start_tool");
257 #elif KMP_OS_WINDOWS
258  HMODULE h = LoadLibrary(fname);
259  if (h) {
260  start_tool = (ompt_start_tool_t)GetProcAddress(h, "ompt_start_tool");
261 #else
262 #error Activation of OMPT is not supported on this platform.
263 #endif
264  if (start_tool && (ret = (*start_tool)(omp_version, runtime_version)))
265  break;
266  }
267  fname = __kmp_str_token(NULL, sep, &buf);
268  }
269  __kmp_str_free(&libs);
270  }
271  return ret;
272 }
273 
274 void ompt_pre_init() {
275  //--------------------------------------------------
276  // Execute the pre-initialization logic only once.
277  //--------------------------------------------------
278  static int ompt_pre_initialized = 0;
279 
280  if (ompt_pre_initialized)
281  return;
282 
283  ompt_pre_initialized = 1;
284 
285  //--------------------------------------------------
286  // Use a tool iff a tool is enabled and available.
287  //--------------------------------------------------
288  const char *ompt_env_var = getenv("OMP_TOOL");
289  tool_setting_e tool_setting = omp_tool_error;
290 
291  if (!ompt_env_var || !strcmp(ompt_env_var, ""))
292  tool_setting = omp_tool_unset;
293  else if (OMPT_STR_MATCH(ompt_env_var, "disabled"))
294  tool_setting = omp_tool_disabled;
295  else if (OMPT_STR_MATCH(ompt_env_var, "enabled"))
296  tool_setting = omp_tool_enabled;
297 
298 #if OMPT_DEBUG
299  printf("ompt_pre_init(): tool_setting = %d\n", tool_setting);
300 #endif
301  switch (tool_setting) {
302  case omp_tool_disabled:
303  break;
304 
305  case omp_tool_unset:
306  case omp_tool_enabled:
307 
308  //--------------------------------------------------
309  // Load tool iff specified in environment variable
310  //--------------------------------------------------
311  ompt_start_tool_result =
312  ompt_try_start_tool(__kmp_openmp_version, ompt_get_runtime_version());
313 
314  memset(&ompt_enabled, 0, sizeof(ompt_enabled));
315  break;
316 
317  case omp_tool_error:
318  fprintf(stderr, "Warning: OMP_TOOL has invalid value \"%s\".\n"
319  " legal values are (NULL,\"\",\"disabled\","
320  "\"enabled\").\n",
321  ompt_env_var);
322  break;
323  }
324 #if OMPT_DEBUG
325  printf("ompt_pre_init(): ompt_enabled = %d\n", ompt_enabled);
326 #endif
327 }
328 
329 extern "C" int omp_get_initial_device(void);
330 
331 void ompt_post_init() {
332  //--------------------------------------------------
333  // Execute the post-initialization logic only once.
334  //--------------------------------------------------
335  static int ompt_post_initialized = 0;
336 
337  if (ompt_post_initialized)
338  return;
339 
340  ompt_post_initialized = 1;
341 
342  //--------------------------------------------------
343  // Initialize the tool if so indicated.
344  //--------------------------------------------------
345  if (ompt_start_tool_result) {
346  ompt_enabled.enabled = !!ompt_start_tool_result->initialize(
347  ompt_fn_lookup, omp_get_initial_device(), &(ompt_start_tool_result->tool_data));
348 
349  if (!ompt_enabled.enabled) {
350  // tool not enabled, zero out the bitmap, and done
351  memset(&ompt_enabled, 0, sizeof(ompt_enabled));
352  return;
353  }
354 
355  kmp_info_t *root_thread = ompt_get_thread();
356 
357  ompt_set_thread_state(root_thread, ompt_state_overhead);
358 
359  if (ompt_enabled.ompt_callback_thread_begin) {
360  ompt_callbacks.ompt_callback(ompt_callback_thread_begin)(
361  ompt_thread_initial, __ompt_get_thread_data_internal());
362  }
363  ompt_data_t *task_data;
364  ompt_data_t *parallel_data;
365  __ompt_get_task_info_internal(0, NULL, &task_data, NULL, &parallel_data, NULL);
366  if (ompt_enabled.ompt_callback_implicit_task) {
367  ompt_callbacks.ompt_callback(ompt_callback_implicit_task)(
368  ompt_scope_begin, parallel_data, task_data, 1, 1, ompt_task_initial);
369  }
370 
371  ompt_set_thread_state(root_thread, ompt_state_work_serial);
372  }
373 }
374 
375 void ompt_fini() {
376  if (ompt_enabled.enabled) {
377  ompt_start_tool_result->finalize(&(ompt_start_tool_result->tool_data));
378  }
379 
380  memset(&ompt_enabled, 0, sizeof(ompt_enabled));
381 }
382 
383 /*****************************************************************************
384  * interface operations
385  ****************************************************************************/
386 
387 /*****************************************************************************
388  * state
389  ****************************************************************************/
390 
391 OMPT_API_ROUTINE int ompt_enumerate_states(int current_state, int *next_state,
392  const char **next_state_name) {
393  const static int len = sizeof(ompt_state_info) / sizeof(ompt_state_info_t);
394  int i = 0;
395 
396  for (i = 0; i < len - 1; i++) {
397  if (ompt_state_info[i].state_id == current_state) {
398  *next_state = ompt_state_info[i + 1].state_id;
399  *next_state_name = ompt_state_info[i + 1].state_name;
400  return 1;
401  }
402  }
403 
404  return 0;
405 }
406 
407 OMPT_API_ROUTINE int ompt_enumerate_mutex_impls(int current_impl,
408  int *next_impl,
409  const char **next_impl_name) {
410  const static int len =
411  sizeof(kmp_mutex_impl_info) / sizeof(kmp_mutex_impl_info_t);
412  int i = 0;
413  for (i = 0; i < len - 1; i++) {
414  if (kmp_mutex_impl_info[i].id != current_impl)
415  continue;
416  *next_impl = kmp_mutex_impl_info[i + 1].id;
417  *next_impl_name = kmp_mutex_impl_info[i + 1].name;
418  return 1;
419  }
420  return 0;
421 }
422 
423 /*****************************************************************************
424  * callbacks
425  ****************************************************************************/
426 
427 OMPT_API_ROUTINE ompt_set_result_t ompt_set_callback(ompt_callbacks_t which,
428  ompt_callback_t callback) {
429  switch (which) {
430 
431 #define ompt_event_macro(event_name, callback_type, event_id) \
432  case event_name: \
433  if (ompt_event_implementation_status(event_name)) { \
434  ompt_callbacks.ompt_callback(event_name) = (callback_type)callback; \
435  ompt_enabled.event_name = (callback != 0); \
436  } \
437  if (callback) \
438  return ompt_event_implementation_status(event_name); \
439  else \
440  return ompt_set_always;
441 
442  FOREACH_OMPT_EVENT(ompt_event_macro)
443 
444 #undef ompt_event_macro
445 
446  default:
447  return ompt_set_error;
448  }
449 }
450 
451 OMPT_API_ROUTINE int ompt_get_callback(ompt_callbacks_t which,
452  ompt_callback_t *callback) {
453  if (!ompt_enabled.enabled)
454  return ompt_get_callback_failure;
455 
456  switch (which) {
457 
458 #define ompt_event_macro(event_name, callback_type, event_id) \
459  case event_name: \
460  if (ompt_event_implementation_status(event_name)) { \
461  ompt_callback_t mycb = \
462  (ompt_callback_t)ompt_callbacks.ompt_callback(event_name); \
463  if (ompt_enabled.event_name && mycb) { \
464  *callback = mycb; \
465  return ompt_get_callback_success; \
466  } \
467  } \
468  return ompt_get_callback_failure;
469 
470  FOREACH_OMPT_EVENT(ompt_event_macro)
471 
472 #undef ompt_event_macro
473 
474  default:
475  return ompt_get_callback_failure;
476  }
477 }
478 
479 /*****************************************************************************
480  * parallel regions
481  ****************************************************************************/
482 
483 OMPT_API_ROUTINE int ompt_get_parallel_info(int ancestor_level,
484  ompt_data_t **parallel_data,
485  int *team_size) {
486  if (!ompt_enabled.enabled)
487  return 0;
488  return __ompt_get_parallel_info_internal(ancestor_level, parallel_data,
489  team_size);
490 }
491 
492 OMPT_API_ROUTINE int ompt_get_state(ompt_wait_id_t *wait_id) {
493  if (!ompt_enabled.enabled)
494  return ompt_state_work_serial;
495  int thread_state = __ompt_get_state_internal(wait_id);
496 
497  if (thread_state == ompt_state_undefined) {
498  thread_state = ompt_state_work_serial;
499  }
500 
501  return thread_state;
502 }
503 
504 /*****************************************************************************
505  * tasks
506  ****************************************************************************/
507 
508 OMPT_API_ROUTINE ompt_data_t *ompt_get_thread_data(void) {
509  if (!ompt_enabled.enabled)
510  return NULL;
511  return __ompt_get_thread_data_internal();
512 }
513 
514 OMPT_API_ROUTINE int ompt_get_task_info(int ancestor_level, int *type,
515  ompt_data_t **task_data,
516  ompt_frame_t **task_frame,
517  ompt_data_t **parallel_data,
518  int *thread_num) {
519  if (!ompt_enabled.enabled)
520  return 0;
521  return __ompt_get_task_info_internal(ancestor_level, type, task_data,
522  task_frame, parallel_data, thread_num);
523 }
524 
525 OMPT_API_ROUTINE int ompt_get_task_memory(void **addr, size_t *size,
526  int block) {
527  return __ompt_get_task_memory_internal(addr, size, block);
528 }
529 
530 /*****************************************************************************
531  * num_procs
532  ****************************************************************************/
533 
534 OMPT_API_ROUTINE int ompt_get_num_procs(void) {
535  // copied from kmp_ftn_entry.h (but modified: OMPT can only be called when
536  // runtime is initialized)
537  return __kmp_avail_proc;
538 }
539 
540 /*****************************************************************************
541  * places
542  ****************************************************************************/
543 
544 OMPT_API_ROUTINE int ompt_get_num_places(void) {
545 // copied from kmp_ftn_entry.h (but modified)
546 #if !KMP_AFFINITY_SUPPORTED
547  return 0;
548 #else
549  if (!KMP_AFFINITY_CAPABLE())
550  return 0;
551  return __kmp_affinity_num_masks;
552 #endif
553 }
554 
555 OMPT_API_ROUTINE int ompt_get_place_proc_ids(int place_num, int ids_size,
556  int *ids) {
557 // copied from kmp_ftn_entry.h (but modified)
558 #if !KMP_AFFINITY_SUPPORTED
559  return 0;
560 #else
561  int i, count;
562  int tmp_ids[ids_size];
563  if (!KMP_AFFINITY_CAPABLE())
564  return 0;
565  if (place_num < 0 || place_num >= (int)__kmp_affinity_num_masks)
566  return 0;
567  /* TODO: Is this safe for asynchronous call from signal handler during runtime
568  * shutdown? */
569  kmp_affin_mask_t *mask = KMP_CPU_INDEX(__kmp_affinity_masks, place_num);
570  count = 0;
571  KMP_CPU_SET_ITERATE(i, mask) {
572  if ((!KMP_CPU_ISSET(i, __kmp_affin_fullMask)) ||
573  (!KMP_CPU_ISSET(i, mask))) {
574  continue;
575  }
576  if (count < ids_size)
577  tmp_ids[count] = i;
578  count++;
579  }
580  if (ids_size >= count) {
581  for (i = 0; i < count; i++) {
582  ids[i] = tmp_ids[i];
583  }
584  }
585  return count;
586 #endif
587 }
588 
589 OMPT_API_ROUTINE int ompt_get_place_num(void) {
590 // copied from kmp_ftn_entry.h (but modified)
591 #if !KMP_AFFINITY_SUPPORTED
592  return -1;
593 #else
594  if (!ompt_enabled.enabled || __kmp_get_gtid() < 0)
595  return -1;
596 
597  int gtid;
598  kmp_info_t *thread;
599  if (!KMP_AFFINITY_CAPABLE())
600  return -1;
601  gtid = __kmp_entry_gtid();
602  thread = __kmp_thread_from_gtid(gtid);
603  if (thread == NULL || thread->th.th_current_place < 0)
604  return -1;
605  return thread->th.th_current_place;
606 #endif
607 }
608 
609 OMPT_API_ROUTINE int ompt_get_partition_place_nums(int place_nums_size,
610  int *place_nums) {
611 // copied from kmp_ftn_entry.h (but modified)
612 #if !KMP_AFFINITY_SUPPORTED
613  return 0;
614 #else
615  if (!ompt_enabled.enabled || __kmp_get_gtid() < 0)
616  return 0;
617 
618  int i, gtid, place_num, first_place, last_place, start, end;
619  kmp_info_t *thread;
620  if (!KMP_AFFINITY_CAPABLE())
621  return 0;
622  gtid = __kmp_entry_gtid();
623  thread = __kmp_thread_from_gtid(gtid);
624  if (thread == NULL)
625  return 0;
626  first_place = thread->th.th_first_place;
627  last_place = thread->th.th_last_place;
628  if (first_place < 0 || last_place < 0)
629  return 0;
630  if (first_place <= last_place) {
631  start = first_place;
632  end = last_place;
633  } else {
634  start = last_place;
635  end = first_place;
636  }
637  if (end - start <= place_nums_size)
638  for (i = 0, place_num = start; place_num <= end; ++place_num, ++i) {
639  place_nums[i] = place_num;
640  }
641  return end - start + 1;
642 #endif
643 }
644 
645 /*****************************************************************************
646  * places
647  ****************************************************************************/
648 
649 OMPT_API_ROUTINE int ompt_get_proc_id(void) {
650  if (!ompt_enabled.enabled || __kmp_get_gtid() < 0)
651  return -1;
652 #if KMP_OS_LINUX
653  return sched_getcpu();
654 #elif KMP_OS_WINDOWS
655  PROCESSOR_NUMBER pn;
656  GetCurrentProcessorNumberEx(&pn);
657  return 64 * pn.Group + pn.Number;
658 #else
659  return -1;
660 #endif
661 }
662 
663 /*****************************************************************************
664  * compatability
665  ****************************************************************************/
666 
667 /*
668  * Currently unused function
669 OMPT_API_ROUTINE int ompt_get_ompt_version() { return OMPT_VERSION; }
670 */
671 
672 /*****************************************************************************
673 * application-facing API
674  ****************************************************************************/
675 
676 /*----------------------------------------------------------------------------
677  | control
678  ---------------------------------------------------------------------------*/
679 
680 int __kmp_control_tool(uint64_t command, uint64_t modifier, void *arg) {
681 
682  if (ompt_enabled.enabled) {
683  if (ompt_enabled.ompt_callback_control_tool) {
684  return ompt_callbacks.ompt_callback(ompt_callback_control_tool)(
685  command, modifier, arg, OMPT_LOAD_RETURN_ADDRESS(__kmp_entry_gtid()));
686  } else {
687  return -1;
688  }
689  } else {
690  return -2;
691  }
692 }
693 
694 /*****************************************************************************
695  * misc
696  ****************************************************************************/
697 
698 OMPT_API_ROUTINE uint64_t ompt_get_unique_id(void) {
699  return __ompt_get_unique_id_internal();
700 }
701 
702 OMPT_API_ROUTINE void ompt_finalize_tool(void) { __kmp_internal_end_atexit(); }
703 
704 /*****************************************************************************
705  * Target
706  ****************************************************************************/
707 
708 OMPT_API_ROUTINE int ompt_get_target_info(uint64_t *device_num,
709  ompt_id_t *target_id,
710  ompt_id_t *host_op_id) {
711  return 0; // thread is not in a target region
712 }
713 
714 OMPT_API_ROUTINE int ompt_get_num_devices(void) {
715  return 1; // only one device (the current device) is available
716 }
717 
718 /*****************************************************************************
719  * API inquiry for tool
720  ****************************************************************************/
721 
722 static ompt_interface_fn_t ompt_fn_lookup(const char *s) {
723 
724 #define ompt_interface_fn(fn) \
725  fn##_t fn##_f = fn; \
726  if (strcmp(s, #fn) == 0) \
727  return (ompt_interface_fn_t)fn##_f;
728 
729  FOREACH_OMPT_INQUIRY_FN(ompt_interface_fn)
730 
731  return (ompt_interface_fn_t)0;
732 }