1 /*
2 ** Copyright (C) 2007, The Android Open Source Project
3 **
4 ** Licensed under the Apache License, Version 2.0 (the "License");
5 ** you may not use this file except in compliance with the License.
6 ** You may obtain a copy of the License at
7 **
8 ** http://www.apache.org/licenses/LICENSE-2.0
9 **
10 ** Unless required by applicable law or agreed to in writing, software
11 ** distributed under the License is distributed on an "AS IS" BASIS,
12 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 ** See the License for the specific language governing permissions and
14 ** limitations under the License.
15 */
16
17 #include "cutils/threads.h"
18
19 // For gettid.
20 #if defined(__APPLE__)
21 #include "AvailabilityMacros.h" // For MAC_OS_X_VERSION_MAX_ALLOWED
22 #include <stdint.h>
23 #include <stdlib.h>
24 #include <sys/syscall.h>
25 #include <sys/time.h>
26 #include <unistd.h>
27 #elif defined(__linux__) && !defined(__ANDROID__)
28 #include <syscall.h>
29 #include <unistd.h>
30 #elif defined(_WIN32)
31 #include <windows.h>
32 #endif
33
34 // No definition needed for Android because we'll just pick up bionic's copy.
35 #ifndef __ANDROID__
gettid()36 pid_t gettid() {
37 #if defined(__APPLE__)
38 return syscall(SYS_thread_selfid);
39 #elif defined(__linux__)
40 return syscall(__NR_gettid);
41 #elif defined(_WIN32)
42 return GetCurrentThreadId();
43 #endif
44 }
45 #endif // __ANDROID__
46
47 #if !defined(_WIN32)
48
thread_store_get(thread_store_t * store)49 void* thread_store_get( thread_store_t* store )
50 {
51 if (!store->has_tls)
52 return NULL;
53
54 return pthread_getspecific( store->tls );
55 }
56
thread_store_set(thread_store_t * store,void * value,thread_store_destruct_t destroy)57 extern void thread_store_set( thread_store_t* store,
58 void* value,
59 thread_store_destruct_t destroy)
60 {
61 pthread_mutex_lock( &store->lock );
62 if (!store->has_tls) {
63 if (pthread_key_create( &store->tls, destroy) != 0) {
64 pthread_mutex_unlock(&store->lock);
65 return;
66 }
67 store->has_tls = 1;
68 }
69 pthread_mutex_unlock( &store->lock );
70
71 pthread_setspecific( store->tls, value );
72 }
73
74 #else /* !defined(_WIN32) */
thread_store_get(thread_store_t * store)75 void* thread_store_get( thread_store_t* store )
76 {
77 if (!store->has_tls)
78 return NULL;
79
80 return (void*) TlsGetValue( store->tls );
81 }
82
thread_store_set(thread_store_t * store,void * value,thread_store_destruct_t destroy)83 void thread_store_set( thread_store_t* store,
84 void* value,
85 thread_store_destruct_t destroy )
86 {
87 /* XXX: can't use destructor on thread exit */
88 if (!store->lock_init) {
89 store->lock_init = -1;
90 InitializeCriticalSection( &store->lock );
91 store->lock_init = -2;
92 } else while (store->lock_init != -2) {
93 Sleep(10); /* 10ms */
94 }
95
96 EnterCriticalSection( &store->lock );
97 if (!store->has_tls) {
98 store->tls = TlsAlloc();
99 if (store->tls == TLS_OUT_OF_INDEXES) {
100 LeaveCriticalSection( &store->lock );
101 return;
102 }
103 store->has_tls = 1;
104 }
105 LeaveCriticalSection( &store->lock );
106
107 TlsSetValue( store->tls, value );
108 }
109 #endif /* !defined(_WIN32) */
110