1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
/*
* Copyright © 2007 Chris Wilson
* Copyright © 2009,2010 Red Hat, Inc.
* Copyright © 2011,2012 Google, Inc.
*
* This is part of HarfBuzz, a text shaping library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Contributor(s):
* Chris Wilson <chris@chris-wilson.co.uk>
* Red Hat Author(s): Behdad Esfahbod
* Google Author(s): Behdad Esfahbod
*/
#ifndef HB_MUTEX_HH
#define HB_MUTEX_HH
#include "hb.hh"
/* mutex */
/* We need external help for these */
#if defined(HB_MUTEX_IMPL_INIT) \
&& defined(hb_mutex_impl_init) \
&& defined(hb_mutex_impl_lock) \
&& defined(hb_mutex_impl_unlock) \
&& defined(hb_mutex_impl_finish)
/* Defined externally, i.e. in config.h; must have typedef'ed hb_mutex_impl_t as well. */
#elif !defined(HB_NO_MT) && (defined(HAVE_PTHREAD) || defined(__APPLE__))
#include <pthread.h>
typedef pthread_mutex_t hb_mutex_impl_t;
#define HB_MUTEX_IMPL_INIT PTHREAD_MUTEX_INITIALIZER
#define hb_mutex_impl_init(M) pthread_mutex_init (M, nullptr)
#define hb_mutex_impl_lock(M) pthread_mutex_lock (M)
#define hb_mutex_impl_unlock(M) pthread_mutex_unlock (M)
#define hb_mutex_impl_finish(M) pthread_mutex_destroy (M)
#elif !defined(HB_NO_MT) && defined(_WIN32)
#include <windows.h>
typedef CRITICAL_SECTION hb_mutex_impl_t;
#define HB_MUTEX_IMPL_INIT {0}
#if defined(WINAPI_FAMILY) && (WINAPI_FAMILY==WINAPI_FAMILY_PC_APP || WINAPI_FAMILY==WINAPI_FAMILY_PHONE_APP)
#define hb_mutex_impl_init(M) InitializeCriticalSectionEx (M, 0, 0)
#else
#define hb_mutex_impl_init(M) InitializeCriticalSection (M)
#endif
#define hb_mutex_impl_lock(M) EnterCriticalSection (M)
#define hb_mutex_impl_unlock(M) LeaveCriticalSection (M)
#define hb_mutex_impl_finish(M) DeleteCriticalSection (M)
#elif !defined(HB_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES)
#if defined(HAVE_SCHED_H) && defined(HAVE_SCHED_YIELD)
# include <sched.h>
# define HB_SCHED_YIELD() sched_yield ()
#else
# define HB_SCHED_YIELD() HB_STMT_START {} HB_STMT_END
#endif
/* This actually is not a totally awful implementation. */
typedef volatile int hb_mutex_impl_t;
#define HB_MUTEX_IMPL_INIT 0
#define hb_mutex_impl_init(M) *(M) = 0
#define hb_mutex_impl_lock(M) HB_STMT_START { while (__sync_lock_test_and_set((M), 1)) HB_SCHED_YIELD (); } HB_STMT_END
#define hb_mutex_impl_unlock(M) __sync_lock_release (M)
#define hb_mutex_impl_finish(M) HB_STMT_START {} HB_STMT_END
#elif defined(HB_NO_MT)
typedef int hb_mutex_impl_t;
#define HB_MUTEX_IMPL_INIT 0
#define hb_mutex_impl_init(M) HB_STMT_START {} HB_STMT_END
#define hb_mutex_impl_lock(M) HB_STMT_START {} HB_STMT_END
#define hb_mutex_impl_unlock(M) HB_STMT_START {} HB_STMT_END
#define hb_mutex_impl_finish(M) HB_STMT_START {} HB_STMT_END
#else
#error "Could not find any system to define mutex macros."
#error "Check hb-mutex.hh for possible resolutions."
#endif
#define HB_MUTEX_INIT {HB_MUTEX_IMPL_INIT}
struct hb_mutex_t
{
hb_mutex_impl_t m;
void init () { hb_mutex_impl_init (&m); }
void lock () { hb_mutex_impl_lock (&m); }
void unlock () { hb_mutex_impl_unlock (&m); }
void fini () { hb_mutex_impl_finish (&m); }
};
struct hb_lock_t
{
hb_lock_t (hb_mutex_t &mutex_) : mutex (mutex_) { mutex.lock (); }
~hb_lock_t () { mutex.unlock (); }
private:
hb_mutex_t &mutex;
};
#endif /* HB_MUTEX_HH */
|
