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      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 #ifndef _LIBS_CUTILS_THREADS_H
     18 #define _LIBS_CUTILS_THREADS_H
     19 
     20 #ifdef __cplusplus
     21 extern "C" {
     22 #endif
     23 
     24 /***********************************************************************/
     25 /***********************************************************************/
     26 /*****                                                             *****/
     27 /*****         local thread storage                                *****/
     28 /*****                                                             *****/
     29 /***********************************************************************/
     30 /***********************************************************************/
     31 
     32 #ifdef HAVE_PTHREADS
     33 
     34 #include  <pthread.h>
     35 
     36 typedef struct {
     37     pthread_mutex_t   lock;
     38     int               has_tls;
     39     pthread_key_t     tls;
     40 
     41 } thread_store_t;
     42 
     43 #define  THREAD_STORE_INITIALIZER  { PTHREAD_MUTEX_INITIALIZER, 0, 0 }
     44 
     45 #elif defined HAVE_WIN32_THREADS
     46 
     47 #include <windows.h>
     48 
     49 typedef struct {
     50     int               lock_init;
     51     int               has_tls;
     52     DWORD             tls;
     53     CRITICAL_SECTION  lock;
     54 
     55 } thread_store_t;
     56 
     57 #define  THREAD_STORE_INITIALIZER  { 0, 0, 0, {0, 0, 0, 0, 0, 0} }
     58 
     59 #else
     60 #  error  "no thread_store_t implementation for your platform !!"
     61 #endif
     62 
     63 typedef void  (*thread_store_destruct_t)(void*  value);
     64 
     65 extern void*  thread_store_get(thread_store_t*  store);
     66 
     67 extern void   thread_store_set(thread_store_t*          store,
     68                                void*                    value,
     69                                thread_store_destruct_t  destroy);
     70 
     71 /***********************************************************************/
     72 /***********************************************************************/
     73 /*****                                                             *****/
     74 /*****         mutexes                                             *****/
     75 /*****                                                             *****/
     76 /***********************************************************************/
     77 /***********************************************************************/
     78 
     79 #ifdef HAVE_PTHREADS
     80 
     81 typedef pthread_mutex_t   mutex_t;
     82 
     83 #define  MUTEX_INITIALIZER  PTHREAD_MUTEX_INITIALIZER
     84 
     85 static __inline__ void  mutex_lock(mutex_t*  lock)
     86 {
     87     pthread_mutex_lock(lock);
     88 }
     89 static __inline__ void  mutex_unlock(mutex_t*  lock)
     90 {
     91     pthread_mutex_unlock(lock);
     92 }
     93 static __inline__ int  mutex_init(mutex_t*  lock)
     94 {
     95     return pthread_mutex_init(lock, NULL);
     96 }
     97 static __inline__ void mutex_destroy(mutex_t*  lock)
     98 {
     99     pthread_mutex_destroy(lock);
    100 }
    101 #endif
    102 
    103 #ifdef HAVE_WIN32_THREADS
    104 typedef struct {
    105     int                init;
    106     CRITICAL_SECTION   lock[1];
    107 } mutex_t;
    108 
    109 #define  MUTEX_INITIALIZER  { 0, {{ NULL, 0, 0, NULL, NULL, 0 }} }
    110 
    111 static __inline__ void  mutex_lock(mutex_t*  lock)
    112 {
    113     if (!lock->init) {
    114         lock->init = 1;
    115         InitializeCriticalSection( lock->lock );
    116         lock->init = 2;
    117     } else while (lock->init != 2)
    118         Sleep(10);
    119 
    120     EnterCriticalSection(lock->lock);
    121 }
    122 
    123 static __inline__ void  mutex_unlock(mutex_t*  lock)
    124 {
    125     LeaveCriticalSection(lock->lock);
    126 }
    127 static __inline__ int  mutex_init(mutex_t*  lock)
    128 {
    129     InitializeCriticalSection(lock->lock);
    130     lock->init = 2;
    131     return 0;
    132 }
    133 static __inline__ void  mutex_destroy(mutex_t*  lock)
    134 {
    135     if (lock->init) {
    136         lock->init = 0;
    137         DeleteCriticalSection(lock->lock);
    138     }
    139 }
    140 #endif
    141 
    142 #ifdef __cplusplus
    143 }
    144 #endif
    145 
    146 #endif /* _LIBS_CUTILS_THREADS_H */
    147