1 /* 2 * Copyright © 2007 Chris Wilson 3 * Copyright © 2009,2010 Red Hat, Inc. 4 * Copyright © 2011,2012 Google, Inc. 5 * 6 * This is part of HarfBuzz, a text shaping library. 7 * 8 * Permission is hereby granted, without written agreement and without 9 * license or royalty fees, to use, copy, modify, and distribute this 10 * software and its documentation for any purpose, provided that the 11 * above copyright notice and the following two paragraphs appear in 12 * all copies of this software. 13 * 14 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR 15 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES 16 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN 17 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 18 * DAMAGE. 19 * 20 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, 21 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 22 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS 23 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO 24 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. 25 * 26 * Contributor(s): 27 * Chris Wilson <chris@chris-wilson.co.uk> 28 * Red Hat Author(s): Behdad Esfahbod 29 * Google Author(s): Behdad Esfahbod 30 */ 31 32 #ifndef HB_MUTEX_HH 33 #define HB_MUTEX_HH 34 35 #include "hb.hh" 36 37 38 /* mutex */ 39 40 /* We need external help for these */ 41 42 #if defined(HB_MUTEX_IMPL_INIT) \ 43 && defined(hb_mutex_impl_init) \ 44 && defined(hb_mutex_impl_lock) \ 45 && defined(hb_mutex_impl_unlock) \ 46 && defined(hb_mutex_impl_finish) 47 48 /* Defined externally, i.e. in config.h; must have typedef'ed hb_mutex_impl_t as well. */ 49 50 51 #elif !defined(HB_NO_MT) && (defined(HAVE_PTHREAD) || defined(__APPLE__)) 52 53 #include <pthread.h> 54 typedef pthread_mutex_t hb_mutex_impl_t; 55 #define HB_MUTEX_IMPL_INIT PTHREAD_MUTEX_INITIALIZER 56 #define hb_mutex_impl_init(M) pthread_mutex_init (M, nullptr) 57 #define hb_mutex_impl_lock(M) pthread_mutex_lock (M) 58 #define hb_mutex_impl_unlock(M) pthread_mutex_unlock (M) 59 #define hb_mutex_impl_finish(M) pthread_mutex_destroy (M) 60 61 62 #elif !defined(HB_NO_MT) && defined(_WIN32) 63 64 typedef CRITICAL_SECTION hb_mutex_impl_t; 65 #define HB_MUTEX_IMPL_INIT {0} 66 #if !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP) 67 #define hb_mutex_impl_init(M) InitializeCriticalSectionEx (M, 0, 0) 68 #else 69 #define hb_mutex_impl_init(M) InitializeCriticalSection (M) 70 #endif 71 #define hb_mutex_impl_lock(M) EnterCriticalSection (M) 72 #define hb_mutex_impl_unlock(M) LeaveCriticalSection (M) 73 #define hb_mutex_impl_finish(M) DeleteCriticalSection (M) 74 75 76 #elif defined(HB_NO_MT) 77 78 typedef int hb_mutex_impl_t; 79 #define HB_MUTEX_IMPL_INIT 0 80 #define hb_mutex_impl_init(M) HB_STMT_START {} HB_STMT_END 81 #define hb_mutex_impl_lock(M) HB_STMT_START {} HB_STMT_END 82 #define hb_mutex_impl_unlock(M) HB_STMT_START {} HB_STMT_END 83 #define hb_mutex_impl_finish(M) HB_STMT_START {} HB_STMT_END 84 85 86 #else 87 88 #error "Could not find any system to define mutex macros." 89 #error "Check hb-mutex.hh for possible resolutions." 90 91 #endif 92 93 94 #define HB_MUTEX_INIT {HB_MUTEX_IMPL_INIT} 95 96 struct hb_mutex_t 97 { 98 hb_mutex_impl_t m; 99 inithb_mutex_t100 void init () { hb_mutex_impl_init (&m); } lockhb_mutex_t101 void lock () { hb_mutex_impl_lock (&m); } unlockhb_mutex_t102 void unlock () { hb_mutex_impl_unlock (&m); } finihb_mutex_t103 void fini () { hb_mutex_impl_finish (&m); } 104 }; 105 106 struct hb_lock_t 107 { hb_lock_thb_lock_t108 hb_lock_t (hb_mutex_t &mutex_) : mutex (mutex_) { mutex.lock (); } ~hb_lock_thb_lock_t109 ~hb_lock_t () { mutex.unlock (); } 110 private: 111 hb_mutex_t &mutex; 112 }; 113 114 115 #endif /* HB_MUTEX_HH */ 116