6 //===----------------------------------------------------------------------===//
8 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
9 // See https://llvm.org/LICENSE.txt for license information.
10 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
12 //===----------------------------------------------------------------------===//
15 #ifndef KMP_TASKDEPS_H
16 #define KMP_TASKDEPS_H
20 #define KMP_ACQUIRE_DEPNODE(gtid, n) __kmp_acquire_lock(&(n)->dn.lock, (gtid))
21 #define KMP_RELEASE_DEPNODE(gtid, n) __kmp_release_lock(&(n)->dn.lock, (gtid))
23 static inline void __kmp_node_deref(kmp_info_t *thread, kmp_depnode_t *node) {
27 kmp_int32 n = KMP_ATOMIC_DEC(&node->dn.nrefs) - 1;
29 KMP_ASSERT(node->dn.nrefs == 0);
31 __kmp_fast_free(thread, node);
33 __kmp_thread_free(thread, node);
38 static inline void __kmp_depnode_list_free(kmp_info_t *thread,
39 kmp_depnode_list *list) {
40 kmp_depnode_list *next;
42 for (; list; list = next) {
45 __kmp_node_deref(thread, list->node);
47 __kmp_fast_free(thread, list);
49 __kmp_thread_free(thread, list);
54 static inline void __kmp_dephash_free_entries(kmp_info_t *thread,
56 for (size_t i = 0; i < h->size; i++) {
58 kmp_dephash_entry_t *next;
59 for (kmp_dephash_entry_t *entry = h->buckets[i]; entry; entry = next) {
60 next = entry->next_in_bucket;
61 __kmp_depnode_list_free(thread, entry->last_ins);
62 __kmp_depnode_list_free(thread, entry->last_mtxs);
63 __kmp_node_deref(thread, entry->last_out);
64 if (entry->mtx_lock) {
65 __kmp_destroy_lock(entry->mtx_lock);
66 __kmp_free(entry->mtx_lock);
69 __kmp_fast_free(thread, entry);
71 __kmp_thread_free(thread, entry);
79 static inline void __kmp_dephash_free(kmp_info_t *thread, kmp_dephash_t *h) {
80 __kmp_dephash_free_entries(thread, h);
82 __kmp_fast_free(thread, h);
84 __kmp_thread_free(thread, h);
88 static inline void __kmp_release_deps(kmp_int32 gtid, kmp_taskdata_t *task) {
89 kmp_info_t *thread = __kmp_threads[gtid];
90 kmp_depnode_t *node = task->td_depnode;
92 if (task->td_dephash) {
94 40, ("__kmp_release_deps: T#%d freeing dependencies hash of task %p.\n",
96 __kmp_dephash_free(thread, task->td_dephash);
97 task->td_dephash = NULL;
103 KA_TRACE(20, ("__kmp_release_deps: T#%d notifying successors of task %p.\n",
106 KMP_ACQUIRE_DEPNODE(gtid, node);
108 NULL; // mark this task as finished, so no new dependencies are generated
109 KMP_RELEASE_DEPNODE(gtid, node);
111 kmp_depnode_list_t *next;
112 for (kmp_depnode_list_t *p = node->dn.successors; p; p = next) {
113 kmp_depnode_t *successor = p->node;
114 kmp_int32 npredecessors = KMP_ATOMIC_DEC(&successor->dn.npredecessors) - 1;
116 // successor task can be NULL for wait_depends or because deps are still
118 if (npredecessors == 0) {
120 if (successor->dn.task) {
121 KA_TRACE(20, ("__kmp_release_deps: T#%d successor %p of %p scheduled "
123 gtid, successor->dn.task, task));
124 __kmp_omp_task(gtid, successor->dn.task, false);
129 __kmp_node_deref(thread, p->node);
131 __kmp_fast_free(thread, p);
133 __kmp_thread_free(thread, p);
137 __kmp_node_deref(thread, node);
141 ("__kmp_release_deps: T#%d all successors of %p notified of completion\n",
145 #endif // KMP_TASKDEPS_H