| /* |
| * kmp_taskdeps.cpp |
| */ |
| |
| //===----------------------------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is dual licensed under the MIT and the University of Illinois Open |
| // Source Licenses. See LICENSE.txt for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| //#define KMP_SUPPORT_GRAPH_OUTPUT 1 |
| |
| #include "kmp.h" |
| #include "kmp_io.h" |
| #include "kmp_wait_release.h" |
| #if OMPT_SUPPORT |
| #include "ompt-specific.h" |
| #endif |
| |
| #if OMP_40_ENABLED |
| |
| // TODO: Improve memory allocation? keep a list of pre-allocated structures? |
| // allocate in blocks? re-use list finished list entries? |
| // TODO: don't use atomic ref counters for stack-allocated nodes. |
| // TODO: find an alternate to atomic refs for heap-allocated nodes? |
| // TODO: Finish graph output support |
| // TODO: kmp_lock_t seems a tad to big (and heavy weight) for this. Check other |
| // runtime locks |
| // TODO: Any ITT support needed? |
| |
| #ifdef KMP_SUPPORT_GRAPH_OUTPUT |
| static std::atomic<kmp_int32> kmp_node_id_seed = ATOMIC_VAR_INIT(0); |
| #endif |
| |
| static void __kmp_init_node(kmp_depnode_t *node) { |
| node->dn.task = NULL; // set to null initially, it will point to the right |
| // task once dependences have been processed |
| node->dn.successors = NULL; |
| __kmp_init_lock(&node->dn.lock); |
| KMP_ATOMIC_ST_RLX(&node->dn.nrefs, |
| 1); // init creates the first reference to the node |
| #ifdef KMP_SUPPORT_GRAPH_OUTPUT |
| node->dn.id = KMP_ATOMIC_INC(&kmp_node_id_seed); |
| #endif |
| } |
| |
| static inline kmp_depnode_t *__kmp_node_ref(kmp_depnode_t *node) { |
| KMP_ATOMIC_INC(&node->dn.nrefs); |
| return node; |
| } |
| |
| static inline void __kmp_node_deref(kmp_info_t *thread, kmp_depnode_t *node) { |
| if (!node) |
| return; |
| |
| kmp_int32 n = KMP_ATOMIC_DEC(&node->dn.nrefs) - 1; |
| if (n == 0) { |
| KMP_ASSERT(node->dn.nrefs == 0); |
| #if USE_FAST_MEMORY |
| __kmp_fast_free(thread, node); |
| #else |
| __kmp_thread_free(thread, node); |
| #endif |
| } |
| } |
| |
| #define KMP_ACQUIRE_DEPNODE(gtid, n) __kmp_acquire_lock(&(n)->dn.lock, (gtid)) |
| #define KMP_RELEASE_DEPNODE(gtid, n) __kmp_release_lock(&(n)->dn.lock, (gtid)) |
| |
| static void __kmp_depnode_list_free(kmp_info_t *thread, kmp_depnode_list *list); |
| |
| enum { KMP_DEPHASH_OTHER_SIZE = 97, KMP_DEPHASH_MASTER_SIZE = 997 }; |
| |
| static inline kmp_int32 __kmp_dephash_hash(kmp_intptr_t addr, size_t hsize) { |
| // TODO alternate to try: set = (((Addr64)(addrUsefulBits * 9.618)) % |
| // m_num_sets ); |
| return ((addr >> 6) ^ (addr >> 2)) % hsize; |
| } |
| |
| static kmp_dephash_t *__kmp_dephash_create(kmp_info_t *thread, |
| kmp_taskdata_t *current_task) { |
| kmp_dephash_t *h; |
| |
| size_t h_size; |
| |
| if (current_task->td_flags.tasktype == TASK_IMPLICIT) |
| h_size = KMP_DEPHASH_MASTER_SIZE; |
| else |
| h_size = KMP_DEPHASH_OTHER_SIZE; |
| |
| kmp_int32 size = |
| h_size * sizeof(kmp_dephash_entry_t *) + sizeof(kmp_dephash_t); |
| |
| #if USE_FAST_MEMORY |
| h = (kmp_dephash_t *)__kmp_fast_allocate(thread, size); |
| #else |
| h = (kmp_dephash_t *)__kmp_thread_malloc(thread, size); |
| #endif |
| h->size = h_size; |
| |
| #ifdef KMP_DEBUG |
| h->nelements = 0; |
| h->nconflicts = 0; |
| #endif |
| h->buckets = (kmp_dephash_entry **)(h + 1); |
| |
| for (size_t i = 0; i < h_size; i++) |
| h->buckets[i] = 0; |
| |
| return h; |
| } |
| |
| void __kmp_dephash_free_entries(kmp_info_t *thread, kmp_dephash_t *h) { |
| for (size_t i = 0; i < h->size; i++) { |
| if (h->buckets[i]) { |
| kmp_dephash_entry_t *next; |
| for (kmp_dephash_entry_t *entry = h->buckets[i]; entry; entry = next) { |
| next = entry->next_in_bucket; |
| __kmp_depnode_list_free(thread, entry->last_ins); |
| __kmp_node_deref(thread, entry->last_out); |
| #if USE_FAST_MEMORY |
| __kmp_fast_free(thread, entry); |
| #else |
| __kmp_thread_free(thread, entry); |
| #endif |
| } |
| h->buckets[i] = 0; |
| } |
| } |
| } |
| |
| void __kmp_dephash_free(kmp_info_t *thread, kmp_dephash_t *h) { |
| __kmp_dephash_free_entries(thread, h); |
| #if USE_FAST_MEMORY |
| __kmp_fast_free(thread, h); |
| #else |
| __kmp_thread_free(thread, h); |
| #endif |
| } |
| |
| static kmp_dephash_entry * |
| __kmp_dephash_find(kmp_info_t *thread, kmp_dephash_t *h, kmp_intptr_t addr) { |
| kmp_int32 bucket = __kmp_dephash_hash(addr, h->size); |
| |
| kmp_dephash_entry_t *entry; |
| for (entry = h->buckets[bucket]; entry; entry = entry->next_in_bucket) |
| if (entry->addr == addr) |
| break; |
| |
| if (entry == NULL) { |
| // create entry. This is only done by one thread so no locking required |
| #if USE_FAST_MEMORY |
| entry = (kmp_dephash_entry_t *)__kmp_fast_allocate( |
| thread, sizeof(kmp_dephash_entry_t)); |
| #else |
| entry = (kmp_dephash_entry_t *)__kmp_thread_malloc( |
| thread, sizeof(kmp_dephash_entry_t)); |
| #endif |
| entry->addr = addr; |
| entry->last_out = NULL; |
| entry->last_ins = NULL; |
| entry->next_in_bucket = h->buckets[bucket]; |
| h->buckets[bucket] = entry; |
| #ifdef KMP_DEBUG |
| h->nelements++; |
| if (entry->next_in_bucket) |
| h->nconflicts++; |
| #endif |
| } |
| return entry; |
| } |
| |
| static kmp_depnode_list_t *__kmp_add_node(kmp_info_t *thread, |
| kmp_depnode_list_t *list, |
| kmp_depnode_t *node) { |
| kmp_depnode_list_t *new_head; |
| |
| #if USE_FAST_MEMORY |
| new_head = (kmp_depnode_list_t *)__kmp_fast_allocate( |
| thread, sizeof(kmp_depnode_list_t)); |
| #else |
| new_head = (kmp_depnode_list_t *)__kmp_thread_malloc( |
| thread, sizeof(kmp_depnode_list_t)); |
| #endif |
| |
| new_head->node = __kmp_node_ref(node); |
| new_head->next = list; |
| |
| return new_head; |
| } |
| |
| static void __kmp_depnode_list_free(kmp_info_t *thread, |
| kmp_depnode_list *list) { |
| kmp_depnode_list *next; |
| |
| for (; list; list = next) { |
| next = list->next; |
| |
| __kmp_node_deref(thread, list->node); |
| #if USE_FAST_MEMORY |
| __kmp_fast_free(thread, list); |
| #else |
| __kmp_thread_free(thread, list); |
| #endif |
| } |
| } |
| |
| static inline void __kmp_track_dependence(kmp_depnode_t *source, |
| kmp_depnode_t *sink, |
| kmp_task_t *sink_task) { |
| #ifdef KMP_SUPPORT_GRAPH_OUTPUT |
| kmp_taskdata_t *task_source = KMP_TASK_TO_TASKDATA(source->dn.task); |
| // do not use sink->dn.task as that is only filled after the dependencies |
| // are already processed! |
| kmp_taskdata_t *task_sink = KMP_TASK_TO_TASKDATA(sink_task); |
| |
| __kmp_printf("%d(%s) -> %d(%s)\n", source->dn.id, |
| task_source->td_ident->psource, sink->dn.id, |
| task_sink->td_ident->psource); |
| #endif |
| #if OMPT_SUPPORT && OMPT_OPTIONAL |
| /* OMPT tracks dependences between task (a=source, b=sink) in which |
| task a blocks the execution of b through the ompt_new_dependence_callback |
| */ |
| if (ompt_enabled.ompt_callback_task_dependence) { |
| kmp_taskdata_t *task_source = KMP_TASK_TO_TASKDATA(source->dn.task); |
| kmp_taskdata_t *task_sink = KMP_TASK_TO_TASKDATA(sink_task); |
| |
| ompt_callbacks.ompt_callback(ompt_callback_task_dependence)( |
| &(task_source->ompt_task_info.task_data), |
| &(task_sink->ompt_task_info.task_data)); |
| } |
| #endif /* OMPT_SUPPORT && OMPT_OPTIONAL */ |
| } |
| |
| template <bool filter> |
| static inline kmp_int32 |
| __kmp_process_deps(kmp_int32 gtid, kmp_depnode_t *node, kmp_dephash_t *hash, |
| bool dep_barrier, kmp_int32 ndeps, |
| kmp_depend_info_t *dep_list, kmp_task_t *task) { |
| KA_TRACE(30, ("__kmp_process_deps<%d>: T#%d processing %d dependencies : " |
| "dep_barrier = %d\n", |
| filter, gtid, ndeps, dep_barrier)); |
| |
| kmp_info_t *thread = __kmp_threads[gtid]; |
| kmp_int32 npredecessors = 0; |
| for (kmp_int32 i = 0; i < ndeps; i++) { |
| const kmp_depend_info_t *dep = &dep_list[i]; |
| |
| KMP_DEBUG_ASSERT(dep->flags.in); |
| |
| if (filter && dep->base_addr == 0) |
| continue; // skip filtered entries |
| |
| kmp_dephash_entry_t *info = |
| __kmp_dephash_find(thread, hash, dep->base_addr); |
| kmp_depnode_t *last_out = info->last_out; |
| |
| if (dep->flags.out && info->last_ins) { |
| for (kmp_depnode_list_t *p = info->last_ins; p; p = p->next) { |
| kmp_depnode_t *indep = p->node; |
| if (indep->dn.task) { |
| KMP_ACQUIRE_DEPNODE(gtid, indep); |
| if (indep->dn.task) { |
| __kmp_track_dependence(indep, node, task); |
| indep->dn.successors = |
| __kmp_add_node(thread, indep->dn.successors, node); |
| KA_TRACE(40, ("__kmp_process_deps<%d>: T#%d adding dependence from " |
| "%p to %p\n", |
| filter, gtid, KMP_TASK_TO_TASKDATA(indep->dn.task), |
| KMP_TASK_TO_TASKDATA(task))); |
| npredecessors++; |
| } |
| KMP_RELEASE_DEPNODE(gtid, indep); |
| } |
| } |
| |
| __kmp_depnode_list_free(thread, info->last_ins); |
| info->last_ins = NULL; |
| |
| } else if (last_out && last_out->dn.task) { |
| KMP_ACQUIRE_DEPNODE(gtid, last_out); |
| if (last_out->dn.task) { |
| __kmp_track_dependence(last_out, node, task); |
| last_out->dn.successors = |
| __kmp_add_node(thread, last_out->dn.successors, node); |
| KA_TRACE( |
| 40, |
| ("__kmp_process_deps<%d>: T#%d adding dependence from %p to %p\n", |
| filter, gtid, KMP_TASK_TO_TASKDATA(last_out->dn.task), |
| KMP_TASK_TO_TASKDATA(task))); |
| |
| npredecessors++; |
| } |
| KMP_RELEASE_DEPNODE(gtid, last_out); |
| } |
| |
| if (dep_barrier) { |
| // if this is a sync point in the serial sequence, then the previous |
| // outputs are guaranteed to be completed after |
| // the execution of this task so the previous output nodes can be cleared. |
| __kmp_node_deref(thread, last_out); |
| info->last_out = NULL; |
| } else { |
| if (dep->flags.out) { |
| __kmp_node_deref(thread, last_out); |
| info->last_out = __kmp_node_ref(node); |
| } else |
| info->last_ins = __kmp_add_node(thread, info->last_ins, node); |
| } |
| } |
| |
| KA_TRACE(30, ("__kmp_process_deps<%d>: T#%d found %d predecessors\n", filter, |
| gtid, npredecessors)); |
| |
| return npredecessors; |
| } |
| |
| #define NO_DEP_BARRIER (false) |
| #define DEP_BARRIER (true) |
| |
| // returns true if the task has any outstanding dependence |
| static bool __kmp_check_deps(kmp_int32 gtid, kmp_depnode_t *node, |
| kmp_task_t *task, kmp_dephash_t *hash, |
| bool dep_barrier, kmp_int32 ndeps, |
| kmp_depend_info_t *dep_list, |
| kmp_int32 ndeps_noalias, |
| kmp_depend_info_t *noalias_dep_list) { |
| int i; |
| |
| #if KMP_DEBUG |
| kmp_taskdata_t *taskdata = KMP_TASK_TO_TASKDATA(task); |
| #endif |
| KA_TRACE(20, ("__kmp_check_deps: T#%d checking dependencies for task %p : %d " |
| "possibly aliased dependencies, %d non-aliased depedencies : " |
| "dep_barrier=%d .\n", |
| gtid, taskdata, ndeps, ndeps_noalias, dep_barrier)); |
| |
| // Filter deps in dep_list |
| // TODO: Different algorithm for large dep_list ( > 10 ? ) |
| for (i = 0; i < ndeps; i++) { |
| if (dep_list[i].base_addr != 0) |
| for (int j = i + 1; j < ndeps; j++) |
| if (dep_list[i].base_addr == dep_list[j].base_addr) { |
| dep_list[i].flags.in |= dep_list[j].flags.in; |
| dep_list[i].flags.out |= dep_list[j].flags.out; |
| dep_list[j].base_addr = 0; // Mark j element as void |
| } |
| } |
| |
| // doesn't need to be atomic as no other thread is going to be accessing this |
| // node just yet. |
| // npredecessors is set -1 to ensure that none of the releasing tasks queues |
| // this task before we have finished processing all the dependencies |
| node->dn.npredecessors = -1; |
| |
| // used to pack all npredecessors additions into a single atomic operation at |
| // the end |
| int npredecessors; |
| |
| npredecessors = __kmp_process_deps<true>(gtid, node, hash, dep_barrier, ndeps, |
| dep_list, task); |
| npredecessors += __kmp_process_deps<false>( |
| gtid, node, hash, dep_barrier, ndeps_noalias, noalias_dep_list, task); |
| |
| node->dn.task = task; |
| KMP_MB(); |
| |
| // Account for our initial fake value |
| npredecessors++; |
| |
| // Update predecessors and obtain current value to check if there are still |
| // any outstandig dependences (some tasks may have finished while we processed |
| // the dependences) |
| npredecessors = |
| node->dn.npredecessors.fetch_add(npredecessors) + npredecessors; |
| |
| KA_TRACE(20, ("__kmp_check_deps: T#%d found %d predecessors for task %p \n", |
| gtid, npredecessors, taskdata)); |
| |
| // beyond this point the task could be queued (and executed) by a releasing |
| // task... |
| return npredecessors > 0 ? true : false; |
| } |
| |
| void __kmp_release_deps(kmp_int32 gtid, kmp_taskdata_t *task) { |
| kmp_info_t *thread = __kmp_threads[gtid]; |
| kmp_depnode_t *node = task->td_depnode; |
| |
| if (task->td_dephash) { |
| KA_TRACE( |
| 40, ("__kmp_release_deps: T#%d freeing dependencies hash of task %p.\n", |
| gtid, task)); |
| __kmp_dephash_free(thread, task->td_dephash); |
| task->td_dephash = NULL; |
| } |
| |
| if (!node) |
| return; |
| |
| KA_TRACE(20, ("__kmp_release_deps: T#%d notifying successors of task %p.\n", |
| gtid, task)); |
| |
| KMP_ACQUIRE_DEPNODE(gtid, node); |
| node->dn.task = |
| NULL; // mark this task as finished, so no new dependencies are generated |
| KMP_RELEASE_DEPNODE(gtid, node); |
| |
| kmp_depnode_list_t *next; |
| for (kmp_depnode_list_t *p = node->dn.successors; p; p = next) { |
| kmp_depnode_t *successor = p->node; |
| kmp_int32 npredecessors = KMP_ATOMIC_DEC(&successor->dn.npredecessors) - 1; |
| |
| // successor task can be NULL for wait_depends or because deps are still |
| // being processed |
| if (npredecessors == 0) { |
| KMP_MB(); |
| if (successor->dn.task) { |
| KA_TRACE(20, ("__kmp_release_deps: T#%d successor %p of %p scheduled " |
| "for execution.\n", |
| gtid, successor->dn.task, task)); |
| __kmp_omp_task(gtid, successor->dn.task, false); |
| } |
| } |
| |
| next = p->next; |
| __kmp_node_deref(thread, p->node); |
| #if USE_FAST_MEMORY |
| __kmp_fast_free(thread, p); |
| #else |
| __kmp_thread_free(thread, p); |
| #endif |
| } |
| |
| __kmp_node_deref(thread, node); |
| |
| KA_TRACE( |
| 20, |
| ("__kmp_release_deps: T#%d all successors of %p notified of completion\n", |
| gtid, task)); |
| } |
| |
| /*! |
| @ingroup TASKING |
| @param loc_ref location of the original task directive |
| @param gtid Global Thread ID of encountering thread |
| @param new_task task thunk allocated by __kmp_omp_task_alloc() for the ''new |
| task'' |
| @param ndeps Number of depend items with possible aliasing |
| @param dep_list List of depend items with possible aliasing |
| @param ndeps_noalias Number of depend items with no aliasing |
| @param noalias_dep_list List of depend items with no aliasing |
| |
| @return Returns either TASK_CURRENT_NOT_QUEUED if the current task was not |
| suspendend and queued, or TASK_CURRENT_QUEUED if it was suspended and queued |
| |
| Schedule a non-thread-switchable task with dependences for execution |
| */ |
| kmp_int32 __kmpc_omp_task_with_deps(ident_t *loc_ref, kmp_int32 gtid, |
| kmp_task_t *new_task, kmp_int32 ndeps, |
| kmp_depend_info_t *dep_list, |
| kmp_int32 ndeps_noalias, |
| kmp_depend_info_t *noalias_dep_list) { |
| |
| kmp_taskdata_t *new_taskdata = KMP_TASK_TO_TASKDATA(new_task); |
| KA_TRACE(10, ("__kmpc_omp_task_with_deps(enter): T#%d loc=%p task=%p\n", gtid, |
| loc_ref, new_taskdata)); |
| |
| kmp_info_t *thread = __kmp_threads[gtid]; |
| kmp_taskdata_t *current_task = thread->th.th_current_task; |
| |
| #if OMPT_SUPPORT |
| if (ompt_enabled.enabled) { |
| OMPT_STORE_RETURN_ADDRESS(gtid); |
| if (!current_task->ompt_task_info.frame.enter_frame) |
| current_task->ompt_task_info.frame.enter_frame = |
| OMPT_GET_FRAME_ADDRESS(1); |
| if (ompt_enabled.ompt_callback_task_create) { |
| ompt_data_t task_data = ompt_data_none; |
| ompt_callbacks.ompt_callback(ompt_callback_task_create)( |
| current_task ? &(current_task->ompt_task_info.task_data) : &task_data, |
| current_task ? &(current_task->ompt_task_info.frame) : NULL, |
| &(new_taskdata->ompt_task_info.task_data), |
| ompt_task_explicit | TASK_TYPE_DETAILS_FORMAT(new_taskdata), 1, |
| OMPT_LOAD_RETURN_ADDRESS(gtid)); |
| } |
| |
| new_taskdata->ompt_task_info.frame.enter_frame = OMPT_GET_FRAME_ADDRESS(0); |
| } |
| |
| #if OMPT_OPTIONAL |
| /* OMPT grab all dependences if requested by the tool */ |
| if (ndeps + ndeps_noalias > 0 && |
| ompt_enabled.ompt_callback_task_dependences) { |
| kmp_int32 i; |
| |
| new_taskdata->ompt_task_info.ndeps = ndeps + ndeps_noalias; |
| new_taskdata->ompt_task_info.deps = |
| (ompt_task_dependence_t *)KMP_OMPT_DEPS_ALLOC( |
| thread, (ndeps + ndeps_noalias) * sizeof(ompt_task_dependence_t)); |
| |
| KMP_ASSERT(new_taskdata->ompt_task_info.deps != NULL); |
| |
| for (i = 0; i < ndeps; i++) { |
| new_taskdata->ompt_task_info.deps[i].variable_addr = |
| (void *)dep_list[i].base_addr; |
| if (dep_list[i].flags.in && dep_list[i].flags.out) |
| new_taskdata->ompt_task_info.deps[i].dependence_flags = |
| ompt_task_dependence_type_inout; |
| else if (dep_list[i].flags.out) |
| new_taskdata->ompt_task_info.deps[i].dependence_flags = |
| ompt_task_dependence_type_out; |
| else if (dep_list[i].flags.in) |
| new_taskdata->ompt_task_info.deps[i].dependence_flags = |
| ompt_task_dependence_type_in; |
| } |
| for (i = 0; i < ndeps_noalias; i++) { |
| new_taskdata->ompt_task_info.deps[ndeps + i].variable_addr = |
| (void *)noalias_dep_list[i].base_addr; |
| if (noalias_dep_list[i].flags.in && noalias_dep_list[i].flags.out) |
| new_taskdata->ompt_task_info.deps[ndeps + i].dependence_flags = |
| ompt_task_dependence_type_inout; |
| else if (noalias_dep_list[i].flags.out) |
| new_taskdata->ompt_task_info.deps[ndeps + i].dependence_flags = |
| ompt_task_dependence_type_out; |
| else if (noalias_dep_list[i].flags.in) |
| new_taskdata->ompt_task_info.deps[ndeps + i].dependence_flags = |
| ompt_task_dependence_type_in; |
| } |
| ompt_callbacks.ompt_callback(ompt_callback_task_dependences)( |
| &(new_taskdata->ompt_task_info.task_data), |
| new_taskdata->ompt_task_info.deps, new_taskdata->ompt_task_info.ndeps); |
| /* We can now free the allocated memory for the dependencies */ |
| /* For OMPD we might want to delay the free until task_end */ |
| KMP_OMPT_DEPS_FREE(thread, new_taskdata->ompt_task_info.deps); |
| new_taskdata->ompt_task_info.deps = NULL; |
| new_taskdata->ompt_task_info.ndeps = 0; |
| } |
| #endif /* OMPT_OPTIONAL */ |
| #endif /* OMPT_SUPPORT */ |
| |
| bool serial = current_task->td_flags.team_serial || |
| current_task->td_flags.tasking_ser || |
| current_task->td_flags.final; |
| #if OMP_45_ENABLED |
| kmp_task_team_t *task_team = thread->th.th_task_team; |
| serial = serial && !(task_team && task_team->tt.tt_found_proxy_tasks); |
| #endif |
| |
| if (!serial && (ndeps > 0 || ndeps_noalias > 0)) { |
| /* if no dependencies have been tracked yet, create the dependence hash */ |
| if (current_task->td_dephash == NULL) |
| current_task->td_dephash = __kmp_dephash_create(thread, current_task); |
| |
| #if USE_FAST_MEMORY |
| kmp_depnode_t *node = |
| (kmp_depnode_t *)__kmp_fast_allocate(thread, sizeof(kmp_depnode_t)); |
| #else |
| kmp_depnode_t *node = |
| (kmp_depnode_t *)__kmp_thread_malloc(thread, sizeof(kmp_depnode_t)); |
| #endif |
| |
| __kmp_init_node(node); |
| new_taskdata->td_depnode = node; |
| |
| if (__kmp_check_deps(gtid, node, new_task, current_task->td_dephash, |
| NO_DEP_BARRIER, ndeps, dep_list, ndeps_noalias, |
| noalias_dep_list)) { |
| KA_TRACE(10, ("__kmpc_omp_task_with_deps(exit): T#%d task had blocking " |
| "dependencies: " |
| "loc=%p task=%p, return: TASK_CURRENT_NOT_QUEUED\n", |
| gtid, loc_ref, new_taskdata)); |
| #if OMPT_SUPPORT |
| if (ompt_enabled.enabled) { |
| current_task->ompt_task_info.frame.enter_frame = NULL; |
| } |
| #endif |
| return TASK_CURRENT_NOT_QUEUED; |
| } |
| } else { |
| KA_TRACE(10, ("__kmpc_omp_task_with_deps(exit): T#%d ignored dependencies " |
| "for task (serialized)" |
| "loc=%p task=%p\n", |
| gtid, loc_ref, new_taskdata)); |
| } |
| |
| KA_TRACE(10, ("__kmpc_omp_task_with_deps(exit): T#%d task had no blocking " |
| "dependencies : " |
| "loc=%p task=%p, transferring to __kmpc_omp_task\n", |
| gtid, loc_ref, new_taskdata)); |
| |
| kmp_int32 ret = __kmp_omp_task(gtid, new_task, true); |
| #if OMPT_SUPPORT |
| if (ompt_enabled.enabled) { |
| current_task->ompt_task_info.frame.enter_frame = NULL; |
| } |
| #endif |
| return ret; |
| } |
| |
| /*! |
| @ingroup TASKING |
| @param loc_ref location of the original task directive |
| @param gtid Global Thread ID of encountering thread |
| @param ndeps Number of depend items with possible aliasing |
| @param dep_list List of depend items with possible aliasing |
| @param ndeps_noalias Number of depend items with no aliasing |
| @param noalias_dep_list List of depend items with no aliasing |
| |
| Blocks the current task until all specifies dependencies have been fulfilled. |
| */ |
| void __kmpc_omp_wait_deps(ident_t *loc_ref, kmp_int32 gtid, kmp_int32 ndeps, |
| kmp_depend_info_t *dep_list, kmp_int32 ndeps_noalias, |
| kmp_depend_info_t *noalias_dep_list) { |
| KA_TRACE(10, ("__kmpc_omp_wait_deps(enter): T#%d loc=%p\n", gtid, loc_ref)); |
| |
| if (ndeps == 0 && ndeps_noalias == 0) { |
| KA_TRACE(10, ("__kmpc_omp_wait_deps(exit): T#%d has no dependencies to " |
| "wait upon : loc=%p\n", |
| gtid, loc_ref)); |
| return; |
| } |
| |
| kmp_info_t *thread = __kmp_threads[gtid]; |
| kmp_taskdata_t *current_task = thread->th.th_current_task; |
| |
| // We can return immediately as: |
| // - dependences are not computed in serial teams (except with proxy tasks) |
| // - if the dephash is not yet created it means we have nothing to wait for |
| bool ignore = current_task->td_flags.team_serial || |
| current_task->td_flags.tasking_ser || |
| current_task->td_flags.final; |
| #if OMP_45_ENABLED |
| ignore = ignore && thread->th.th_task_team != NULL && |
| thread->th.th_task_team->tt.tt_found_proxy_tasks == FALSE; |
| #endif |
| ignore = ignore || current_task->td_dephash == NULL; |
| |
| if (ignore) { |
| KA_TRACE(10, ("__kmpc_omp_wait_deps(exit): T#%d has no blocking " |
| "dependencies : loc=%p\n", |
| gtid, loc_ref)); |
| return; |
| } |
| |
| kmp_depnode_t node = {0}; |
| __kmp_init_node(&node); |
| |
| if (!__kmp_check_deps(gtid, &node, NULL, current_task->td_dephash, |
| DEP_BARRIER, ndeps, dep_list, ndeps_noalias, |
| noalias_dep_list)) { |
| KA_TRACE(10, ("__kmpc_omp_wait_deps(exit): T#%d has no blocking " |
| "dependencies : loc=%p\n", |
| gtid, loc_ref)); |
| return; |
| } |
| |
| int thread_finished = FALSE; |
| kmp_flag_32 flag((std::atomic<kmp_uint32> *)&node.dn.npredecessors, 0U); |
| while (node.dn.npredecessors > 0) { |
| flag.execute_tasks(thread, gtid, FALSE, |
| &thread_finished USE_ITT_BUILD_ARG(NULL), |
| __kmp_task_stealing_constraint); |
| } |
| |
| KA_TRACE(10, ("__kmpc_omp_wait_deps(exit): T#%d finished waiting : loc=%p\n", |
| gtid, loc_ref)); |
| } |
| |
| #endif /* OMP_40_ENABLED */ |
