1 /* libs/cutils/threads.c
2 **
3 ** Copyright (C) 2007, The Android Open Source Project
4 **
5 ** Licensed under the Apache License, Version 2.0 (the "License");
6 ** you may not use this file except in compliance with the License.
7 ** You may obtain a copy of the License at
8 **
9 ** http://www.apache.org/licenses/LICENSE-2.0
10 **
11 ** Unless required by applicable law or agreed to in writing, software
12 ** distributed under the License is distributed on an "AS IS" BASIS,
13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 ** See the License for the specific language governing permissions and
15 ** limitations under the License.
16 */
17 #include <cutils/threads.h>
18
19 #ifdef HAVE_PTHREADS
thread_store_get(thread_store_t * store)20 void* thread_store_get( thread_store_t* store )
21 {
22 const pthread_key_t k = store->tls;
23
24 if (!store->has_tls)
25 return NULL;
26
27 return pthread_getspecific( store->tls );
28 }
29
thread_store_set(thread_store_t * store,void * value,thread_store_destruct_t destroy)30 extern void thread_store_set( thread_store_t* store,
31 void* value,
32 thread_store_destruct_t destroy)
33 {
34 pthread_mutex_lock( &store->lock );
35 if (!store->has_tls) {
36 if (pthread_key_create( &store->tls, destroy) != 0) {
37 pthread_mutex_unlock(&store->lock);
38 return;
39 }
40 store->has_tls = 1;
41 }
42 pthread_mutex_unlock( &store->lock );
43
44 pthread_setspecific( store->tls, value );
45 }
46
47 #endif
48
49 #ifdef HAVE_WIN32_THREADS
thread_store_get(thread_store_t * store)50 void* thread_store_get( thread_store_t* store )
51 {
52 if (!store->has_tls)
53 return NULL;
54
55 return (void*) TlsGetValue( store->tls );
56 }
57
thread_store_set(thread_store_t * store,void * value,thread_store_destruct_t destroy)58 void thread_store_set( thread_store_t* store,
59 void* value,
60 thread_store_destruct_t destroy )
61 {
62 /* XXX: can't use destructor on thread exit */
63 if (!store->lock_init) {
64 store->lock_init = -1;
65 InitializeCriticalSection( &store->lock );
66 store->lock_init = -2;
67 } else while (store->lock_init != -2) {
68 Sleep(10); /* 10ms */
69 }
70
71 EnterCriticalSection( &store->lock );
72 if (!store->has_tls) {
73 store->tls = TlsAlloc();
74 if (store->tls == TLS_OUT_OF_INDEXES) {
75 LeaveCriticalSection( &store->lock );
76 return;
77 }
78 store->has_tls = 1;
79 }
80 LeaveCriticalSection( &store->lock );
81
82 TlsSetValue( store->tls, value );
83 }
84 #endif
85