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The open source OpenXR runtime
1// Copyright 2020, Collabora, Ltd.
2// SPDX-License-Identifier: BSL-1.0
3/*!
4 * @file
5 * @brief Slightly higher level thread safe helpers.
6 * @author Jakob Bornecrantz <jakob@collabora.com>
7 *
8 * @ingroup aux_util
9 */
10
11#pragma once
12
13#include "os/os_threading.h"
14
15
16struct u_threading_stack
17{
18 struct os_mutex mutex;
19
20 void **arr;
21
22 size_t length;
23 size_t num;
24};
25
26
27static inline void
28u_threading_stack_init(struct u_threading_stack *uts)
29{
30 os_mutex_init(&uts->mutex);
31}
32
33static inline void
34u_threading_stack_push(struct u_threading_stack *uts, void *ptr)
35{
36 if (ptr == NULL) {
37 return;
38 }
39
40 os_mutex_lock(&uts->mutex);
41
42 if (uts->num + 1 > uts->length) {
43 uts->length += 8;
44 uts->arr = (void **)realloc(uts->arr, uts->length * sizeof(void *));
45 }
46
47 uts->arr[uts->num++] = ptr;
48
49 os_mutex_unlock(&uts->mutex);
50}
51
52static inline void *
53u_threading_stack_pop(struct u_threading_stack *uts)
54{
55 void *ret = NULL;
56
57 os_mutex_lock(&uts->mutex);
58
59 if (uts->num > 0) {
60 ret = uts->arr[--uts->num];
61 uts->arr[uts->num] = NULL;
62 }
63
64 os_mutex_unlock(&uts->mutex);
65
66 return ret;
67}
68
69static inline void *
70u_threading_stack_fini(struct u_threading_stack *uts)
71{
72 void *ret = NULL;
73
74 os_mutex_destroy(&uts->mutex);
75
76 if (uts->arr != NULL) {
77 free(uts->arr);
78 uts->arr = NULL;
79 }
80
81 return ret;
82}