kmp_taskdeps.h
3.93 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
/*
* kmp_taskdeps.h
*/
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef KMP_TASKDEPS_H
#define KMP_TASKDEPS_H
#include "kmp.h"
#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 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
}
}
static inline 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_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_depnode_list_free(thread, entry->last_mtxs);
__kmp_node_deref(thread, entry->last_out);
if (entry->mtx_lock) {
__kmp_destroy_lock(entry->mtx_lock);
__kmp_free(entry->mtx_lock);
}
#if USE_FAST_MEMORY
__kmp_fast_free(thread, entry);
#else
__kmp_thread_free(thread, entry);
#endif
}
h->buckets[i] = 0;
}
}
}
static inline 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 inline 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));
}
#endif // KMP_TASKDEPS_H