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      1 /**************************************************************************
      2  *
      3  * Copyright 2020 Lag Free Games, LLC
      4  * All Rights Reserved.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the
      8  * "Software"), to deal in the Software without restriction, including
      9  * without limitation the rights to use, copy, modify, merge, publish,
     10  * distribute, sub license, and/or sell copies of the Software, and to
     11  * permit persons to whom the Software is furnished to do so, subject to
     12  * the following conditions:
     13  *
     14  * The above copyright notice and this permission notice (including the
     15  * next paragraph) shall be included in all copies or substantial portions
     16  * of the Software.
     17  *
     18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
     19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
     21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
     22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
     23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
     24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     25  *
     26  **************************************************************************/
     27 
     28 #ifndef RWLOCK_H
     29 #define RWLOCK_H
     30 
     31 #ifdef _WIN32
     32 #include <windows.h>
     33 #else
     34 #include <pthread.h>
     35 #endif
     36 
     37 #ifdef __cplusplus
     38 extern "C" {
     39 #endif
     40 
     41 struct u_rwlock
     42 {
     43 #ifdef _WIN32
     44    SRWLOCK rwlock;
     45 #else
     46    pthread_rwlock_t rwlock;
     47 #endif
     48 };
     49 
     50 static inline int u_rwlock_init(struct u_rwlock *rwlock)
     51 {
     52 #ifdef _WIN32
     53    InitializeSRWLock(&rwlock->rwlock);
     54    return 0;
     55 #else
     56    return pthread_rwlock_init(&rwlock->rwlock, NULL);
     57 #endif
     58 }
     59 
     60 static inline int u_rwlock_destroy(struct u_rwlock *rwlock)
     61 {
     62 #ifdef _WIN32
     63    return 0;
     64 #else
     65    return pthread_rwlock_destroy(&rwlock->rwlock);
     66 #endif
     67 }
     68 
     69 static inline int u_rwlock_rdlock(struct u_rwlock *rwlock)
     70 {
     71 #ifdef _WIN32
     72    AcquireSRWLockShared(&rwlock->rwlock);
     73    return 0;
     74 #else
     75    return pthread_rwlock_rdlock(&rwlock->rwlock);
     76 #endif
     77 }
     78 
     79 static inline int u_rwlock_rdunlock(struct u_rwlock *rwlock)
     80 {
     81 #ifdef _WIN32
     82    ReleaseSRWLockShared(&rwlock->rwlock);
     83    return 0;
     84 #else
     85    return pthread_rwlock_unlock(&rwlock->rwlock);
     86 #endif
     87 }
     88 
     89 static inline int u_rwlock_wrlock(struct u_rwlock *rwlock)
     90 {
     91 #ifdef _WIN32
     92    AcquireSRWLockExclusive(&rwlock->rwlock);
     93    return 0;
     94 #else
     95    return pthread_rwlock_wrlock(&rwlock->rwlock);
     96 #endif
     97 }
     98 
     99 static inline int u_rwlock_wrunlock(struct u_rwlock *rwlock)
    100 {
    101 #ifdef _WIN32
    102    ReleaseSRWLockExclusive(&rwlock->rwlock);
    103    return 0;
    104 #else
    105    return pthread_rwlock_unlock(&rwlock->rwlock);
    106 #endif
    107 }
    108 
    109 #ifdef __cplusplus
    110 }
    111 #endif
    112 
    113 #endif
    114