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MFV: r351091
[FreeBSD/FreeBSD.git] / contrib / jemalloc / include / jemalloc / internal / tsd_generic.h
1 #ifdef JEMALLOC_INTERNAL_TSD_GENERIC_H
2 #error This file should be included only once, by tsd.h.
3 #endif
4 #define JEMALLOC_INTERNAL_TSD_GENERIC_H
5
6 typedef struct tsd_init_block_s tsd_init_block_t;
7 struct tsd_init_block_s {
8         ql_elm(tsd_init_block_t) link;
9         pthread_t thread;
10         void *data;
11 };
12
13 /* Defined in tsd.c, to allow the mutex headers to have tsd dependencies. */
14 typedef struct tsd_init_head_s tsd_init_head_t;
15
16 typedef struct {
17         bool initialized;
18         tsd_t val;
19 } tsd_wrapper_t;
20
21 void *tsd_init_check_recursion(tsd_init_head_t *head,
22     tsd_init_block_t *block);
23 void tsd_init_finish(tsd_init_head_t *head, tsd_init_block_t *block);
24
25 extern pthread_key_t tsd_tsd;
26 extern tsd_init_head_t tsd_init_head;
27 extern tsd_wrapper_t tsd_boot_wrapper;
28 extern bool tsd_booted;
29
30 /* Initialization/cleanup. */
31 JEMALLOC_ALWAYS_INLINE void
32 tsd_cleanup_wrapper(void *arg) {
33         tsd_wrapper_t *wrapper = (tsd_wrapper_t *)arg;
34
35         if (wrapper->initialized) {
36                 wrapper->initialized = false;
37                 tsd_cleanup(&wrapper->val);
38                 if (wrapper->initialized) {
39                         /* Trigger another cleanup round. */
40                         if (pthread_setspecific(tsd_tsd, (void *)wrapper) != 0)
41                         {
42                                 malloc_write("<jemalloc>: Error setting TSD\n");
43                                 if (opt_abort) {
44                                         abort();
45                                 }
46                         }
47                         return;
48                 }
49         }
50         malloc_tsd_dalloc(wrapper);
51 }
52
53 JEMALLOC_ALWAYS_INLINE void
54 tsd_wrapper_set(tsd_wrapper_t *wrapper) {
55         if (pthread_setspecific(tsd_tsd, (void *)wrapper) != 0) {
56                 malloc_write("<jemalloc>: Error setting TSD\n");
57                 abort();
58         }
59 }
60
61 JEMALLOC_ALWAYS_INLINE tsd_wrapper_t *
62 tsd_wrapper_get(bool init) {
63         tsd_wrapper_t *wrapper = (tsd_wrapper_t *)pthread_getspecific(tsd_tsd);
64
65         if (init && unlikely(wrapper == NULL)) {
66                 tsd_init_block_t block;
67                 wrapper = (tsd_wrapper_t *)
68                     tsd_init_check_recursion(&tsd_init_head, &block);
69                 if (wrapper) {
70                         return wrapper;
71                 }
72                 wrapper = (tsd_wrapper_t *)
73                     malloc_tsd_malloc(sizeof(tsd_wrapper_t));
74                 block.data = (void *)wrapper;
75                 if (wrapper == NULL) {
76                         malloc_write("<jemalloc>: Error allocating TSD\n");
77                         abort();
78                 } else {
79                         wrapper->initialized = false;
80                         tsd_t initializer = TSD_INITIALIZER;
81                         wrapper->val = initializer;
82                 }
83                 tsd_wrapper_set(wrapper);
84                 tsd_init_finish(&tsd_init_head, &block);
85         }
86         return wrapper;
87 }
88
89 JEMALLOC_ALWAYS_INLINE bool
90 tsd_boot0(void) {
91         if (pthread_key_create(&tsd_tsd, tsd_cleanup_wrapper) != 0) {
92                 return true;
93         }
94         tsd_wrapper_set(&tsd_boot_wrapper);
95         tsd_booted = true;
96         return false;
97 }
98
99 JEMALLOC_ALWAYS_INLINE void
100 tsd_boot1(void) {
101         tsd_wrapper_t *wrapper;
102         wrapper = (tsd_wrapper_t *)malloc_tsd_malloc(sizeof(tsd_wrapper_t));
103         if (wrapper == NULL) {
104                 malloc_write("<jemalloc>: Error allocating TSD\n");
105                 abort();
106         }
107         tsd_boot_wrapper.initialized = false;
108         tsd_cleanup(&tsd_boot_wrapper.val);
109         wrapper->initialized = false;
110         tsd_t initializer = TSD_INITIALIZER;
111         wrapper->val = initializer;
112         tsd_wrapper_set(wrapper);
113 }
114
115 JEMALLOC_ALWAYS_INLINE bool
116 tsd_boot(void) {
117         if (tsd_boot0()) {
118                 return true;
119         }
120         tsd_boot1();
121         return false;
122 }
123
124 JEMALLOC_ALWAYS_INLINE bool
125 tsd_booted_get(void) {
126         return tsd_booted;
127 }
128
129 JEMALLOC_ALWAYS_INLINE bool
130 tsd_get_allocates(void) {
131         return true;
132 }
133
134 /* Get/set. */
135 JEMALLOC_ALWAYS_INLINE tsd_t *
136 tsd_get(bool init) {
137         tsd_wrapper_t *wrapper;
138
139         assert(tsd_booted);
140         wrapper = tsd_wrapper_get(init);
141         if (tsd_get_allocates() && !init && wrapper == NULL) {
142                 return NULL;
143         }
144         return &wrapper->val;
145 }
146
147 JEMALLOC_ALWAYS_INLINE void
148 tsd_set(tsd_t *val) {
149         tsd_wrapper_t *wrapper;
150
151         assert(tsd_booted);
152         wrapper = tsd_wrapper_get(true);
153         if (likely(&wrapper->val != val)) {
154                 wrapper->val = *(val);
155         }
156         wrapper->initialized = true;
157 }