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hb-mutex.hh
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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) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES)
77 
78 #if defined(HAVE_SCHED_H) && defined(HAVE_SCHED_YIELD)
79 # include <sched.h>
80 # define HB_SCHED_YIELD() sched_yield ()
81 #else
82 # define HB_SCHED_YIELD() HB_STMT_START {} HB_STMT_END
83 #endif
84 
85 /* This actually is not a totally awful implementation. */
86 typedef volatile int hb_mutex_impl_t;
87 #define HB_MUTEX_IMPL_INIT 0
88 #define hb_mutex_impl_init(M) *(M) = 0
89 #define hb_mutex_impl_lock(M) HB_STMT_START { while (__sync_lock_test_and_set((M), 1)) HB_SCHED_YIELD (); } HB_STMT_END
90 #define hb_mutex_impl_unlock(M) __sync_lock_release (M)
91 #define hb_mutex_impl_finish(M) HB_STMT_START {} HB_STMT_END
92 
93 
94 #elif defined(HB_NO_MT)
95 
96 typedef int hb_mutex_impl_t;
97 #define HB_MUTEX_IMPL_INIT 0
98 #define hb_mutex_impl_init(M) HB_STMT_START {} HB_STMT_END
99 #define hb_mutex_impl_lock(M) HB_STMT_START {} HB_STMT_END
100 #define hb_mutex_impl_unlock(M) HB_STMT_START {} HB_STMT_END
101 #define hb_mutex_impl_finish(M) HB_STMT_START {} HB_STMT_END
102 
103 
104 #else
105 
106 #error "Could not find any system to define mutex macros."
107 #error "Check hb-mutex.hh for possible resolutions."
108 
109 #endif
110 
111 
112 #define HB_MUTEX_INIT {HB_MUTEX_IMPL_INIT}
113 
115 {
116  hb_mutex_impl_t m;
117 
118  void init () { hb_mutex_impl_init (&m); }
119  void lock () { hb_mutex_impl_lock (&m); }
120  void unlock () { hb_mutex_impl_unlock (&m); }
121  void fini () { hb_mutex_impl_finish (&m); }
122 };
123 
124 struct hb_lock_t
125 {
126  hb_lock_t (hb_mutex_t &mutex_) : mutex (mutex_) { mutex.lock (); }
128  private:
130 };
131 
132 
133 #endif /* HB_MUTEX_HH */
hb_mutex_t & mutex
Definition: hb-mutex.hh:129
hb_lock_t(hb_mutex_t &mutex_)
Definition: hb-mutex.hh:126
~hb_lock_t()
Definition: hb-mutex.hh:127
hb_mutex_impl_t m
Definition: hb-mutex.hh:116
void fini()
Definition: hb-mutex.hh:121
void lock()
Definition: hb-mutex.hh:119
void init()
Definition: hb-mutex.hh:118
void unlock()
Definition: hb-mutex.hh:120