Line data Source code
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_PRIVATE_HH
33 : #define HB_MUTEX_PRIVATE_HH
34 :
35 : #include "hb-private.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(_WIN32) || defined(__CYGWIN__))
52 :
53 : #include <windows.h>
54 : typedef CRITICAL_SECTION hb_mutex_impl_t;
55 : #define HB_MUTEX_IMPL_INIT {0}
56 : #if defined(WINAPI_FAMILY) && (WINAPI_FAMILY==WINAPI_FAMILY_PC_APP || WINAPI_FAMILY==WINAPI_FAMILY_PHONE_APP)
57 : #define hb_mutex_impl_init(M) InitializeCriticalSectionEx (M, 0, 0)
58 : #else
59 : #define hb_mutex_impl_init(M) InitializeCriticalSection (M)
60 : #endif
61 : #define hb_mutex_impl_lock(M) EnterCriticalSection (M)
62 : #define hb_mutex_impl_unlock(M) LeaveCriticalSection (M)
63 : #define hb_mutex_impl_finish(M) DeleteCriticalSection (M)
64 :
65 :
66 : #elif !defined(HB_NO_MT) && (defined(HAVE_PTHREAD) || defined(__APPLE__))
67 :
68 : #include <pthread.h>
69 : typedef pthread_mutex_t hb_mutex_impl_t;
70 : #define HB_MUTEX_IMPL_INIT PTHREAD_MUTEX_INITIALIZER
71 : #define hb_mutex_impl_init(M) pthread_mutex_init (M, NULL)
72 : #define hb_mutex_impl_lock(M) pthread_mutex_lock (M)
73 : #define hb_mutex_impl_unlock(M) pthread_mutex_unlock (M)
74 : #define hb_mutex_impl_finish(M) pthread_mutex_destroy (M)
75 :
76 :
77 : #elif !defined(HB_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES)
78 :
79 : #if defined(HAVE_SCHED_H) && defined(HAVE_SCHED_YIELD)
80 : # include <sched.h>
81 : # define HB_SCHED_YIELD() sched_yield ()
82 : #else
83 : # define HB_SCHED_YIELD() HB_STMT_START {} HB_STMT_END
84 : #endif
85 :
86 : /* This actually is not a totally awful implementation. */
87 : typedef volatile int hb_mutex_impl_t;
88 : #define HB_MUTEX_IMPL_INIT 0
89 : #define hb_mutex_impl_init(M) *(M) = 0
90 : #define hb_mutex_impl_lock(M) HB_STMT_START { while (__sync_lock_test_and_set((M), 1)) HB_SCHED_YIELD (); } HB_STMT_END
91 : #define hb_mutex_impl_unlock(M) __sync_lock_release (M)
92 : #define hb_mutex_impl_finish(M) HB_STMT_START {} HB_STMT_END
93 :
94 :
95 : #elif !defined(HB_NO_MT)
96 :
97 : #if defined(HAVE_SCHED_H) && defined(HAVE_SCHED_YIELD)
98 : # include <sched.h>
99 : # define HB_SCHED_YIELD() sched_yield ()
100 : #else
101 : # define HB_SCHED_YIELD() HB_STMT_START {} HB_STMT_END
102 : #endif
103 :
104 : #define HB_MUTEX_INT_NIL 1 /* Warn that fallback implementation is in use. */
105 : typedef volatile int hb_mutex_impl_t;
106 : #define HB_MUTEX_IMPL_INIT 0
107 : #define hb_mutex_impl_init(M) *(M) = 0
108 : #define hb_mutex_impl_lock(M) HB_STMT_START { while (*(M)) HB_SCHED_YIELD (); (*(M))++; } HB_STMT_END
109 : #define hb_mutex_impl_unlock(M) (*(M))--;
110 : #define hb_mutex_impl_finish(M) HB_STMT_START {} HB_STMT_END
111 :
112 :
113 : #else /* HB_NO_MT */
114 :
115 : typedef int hb_mutex_impl_t;
116 : #define HB_MUTEX_IMPL_INIT 0
117 : #define hb_mutex_impl_init(M) HB_STMT_START {} HB_STMT_END
118 : #define hb_mutex_impl_lock(M) HB_STMT_START {} HB_STMT_END
119 : #define hb_mutex_impl_unlock(M) HB_STMT_START {} HB_STMT_END
120 : #define hb_mutex_impl_finish(M) HB_STMT_START {} HB_STMT_END
121 :
122 :
123 : #endif
124 :
125 :
126 : #define HB_MUTEX_INIT {HB_MUTEX_IMPL_INIT}
127 :
128 : struct hb_mutex_t
129 : {
130 : /* TODO Add tracing. */
131 :
132 : hb_mutex_impl_t m;
133 :
134 154 : inline void init (void) { hb_mutex_impl_init (&m); }
135 0 : inline void lock (void) { hb_mutex_impl_lock (&m); }
136 0 : inline void unlock (void) { hb_mutex_impl_unlock (&m); }
137 41 : inline void finish (void) { hb_mutex_impl_finish (&m); }
138 : };
139 :
140 :
141 : #endif /* HB_MUTEX_PRIVATE_HH */
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