hb-mutex.hh (4295B)
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_lock) \ 44 && defined(hb_mutex_impl_unlock) \ 45 && defined(hb_mutex_impl_finish) 46 47 /* Defined externally, i.e. in config.h; must have typedef'ed hb_mutex_impl_t as well. */ 48 49 50 #elif !defined(HB_NO_MT) && !defined(HB_MUTEX_IMPL_STD_MUTEX) && (defined(HAVE_PTHREAD) || defined(__APPLE__)) 51 52 #include <pthread.h> 53 typedef pthread_mutex_t hb_mutex_impl_t; 54 #define hb_mutex_impl_init(M) pthread_mutex_init (M, nullptr) 55 #define hb_mutex_impl_lock(M) pthread_mutex_lock (M) 56 #define hb_mutex_impl_unlock(M) pthread_mutex_unlock (M) 57 #define hb_mutex_impl_finish(M) pthread_mutex_destroy (M) 58 59 60 #elif !defined(HB_NO_MT) && !defined(HB_MUTEX_IMPL_STD_MUTEX) && defined(_WIN32) 61 62 typedef CRITICAL_SECTION hb_mutex_impl_t; 63 #if !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP) && WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP) 64 #define hb_mutex_impl_init(M) InitializeCriticalSectionEx (M, 0, 0) 65 #else 66 #define hb_mutex_impl_init(M) InitializeCriticalSection (M) 67 #endif 68 #define hb_mutex_impl_lock(M) EnterCriticalSection (M) 69 #define hb_mutex_impl_unlock(M) LeaveCriticalSection (M) 70 #define hb_mutex_impl_finish(M) DeleteCriticalSection (M) 71 72 73 #elif !defined(HB_NO_MT) 74 75 #include <mutex> 76 typedef std::mutex hb_mutex_impl_t; 77 #define hb_mutex_impl_init(M) HB_STMT_START { new (M) hb_mutex_impl_t; } HB_STMT_END 78 #define hb_mutex_impl_lock(M) (M)->lock () 79 #define hb_mutex_impl_unlock(M) (M)->unlock () 80 #define hb_mutex_impl_finish(M) HB_STMT_START { (M)->~hb_mutex_impl_t(); } HB_STMT_END 81 82 83 #else /* defined(HB_NO_MT) */ 84 85 typedef int hb_mutex_impl_t; 86 #define hb_mutex_impl_init(M) HB_STMT_START {} HB_STMT_END 87 #define hb_mutex_impl_lock(M) HB_STMT_START {} HB_STMT_END 88 #define hb_mutex_impl_unlock(M) HB_STMT_START {} HB_STMT_END 89 #define hb_mutex_impl_finish(M) HB_STMT_START {} HB_STMT_END 90 91 92 #endif 93 94 95 struct hb_mutex_t 96 { 97 /* Create space for, but do not initialize m. */ 98 alignas(hb_mutex_impl_t) char m[sizeof (hb_mutex_impl_t)]; 99 100 hb_mutex_t () { init (); } 101 ~hb_mutex_t () { fini (); } 102 hb_mutex_t (const hb_mutex_t &) = delete; 103 hb_mutex_t &operator= (const hb_mutex_t &) = delete; 104 105 #pragma GCC diagnostic push 106 #pragma GCC diagnostic ignored "-Wcast-align" 107 void init () { hb_mutex_impl_init ((hb_mutex_impl_t *) m); } 108 void lock () { hb_mutex_impl_lock ((hb_mutex_impl_t *) m); } 109 void unlock () { hb_mutex_impl_unlock ((hb_mutex_impl_t *) m); } 110 void fini () { hb_mutex_impl_finish ((hb_mutex_impl_t *) m); } 111 #pragma GCC diagnostic pop 112 }; 113 114 struct hb_lock_t 115 { 116 hb_lock_t (hb_mutex_t &mutex_) : mutex (&mutex_) { mutex->lock (); } 117 hb_lock_t (hb_mutex_t *mutex_) : mutex (mutex_) { if (mutex) mutex->lock (); } 118 ~hb_lock_t () { if (mutex) mutex->unlock (); } 119 120 hb_lock_t (const hb_lock_t &) = delete; 121 hb_lock_t &operator= (const hb_lock_t &) = delete; 122 123 private: 124 hb_mutex_t *mutex; 125 }; 126 127 128 #endif /* HB_MUTEX_HH */