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1 /*
2  * Copyright © 2017 Gražvydas Ignotas
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice (including the next
12  * paragraph) shall be included in all copies or substantial portions of the
13  * Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21  * IN THE SOFTWARE.
22  */
23 
24 #if defined(MISSING_64BIT_ATOMICS) && defined(HAVE_PTHREAD)
25 
26 #include <stdint.h>
27 #include <pthread.h>
28 
29 #if defined(HAVE_FUNC_ATTRIBUTE_WEAK) && !defined(__CYGWIN__)
30 #define WEAK __attribute__((weak))
31 #else
32 #define WEAK
33 #endif
34 
35 static pthread_mutex_t sync_mutex = PTHREAD_MUTEX_INITIALIZER;
36 
37 WEAK uint64_t
__sync_add_and_fetch_8(uint64_t * ptr,uint64_t val)38 __sync_add_and_fetch_8(uint64_t *ptr, uint64_t val)
39 {
40    uint64_t r;
41 
42    pthread_mutex_lock(&sync_mutex);
43    *ptr += val;
44    r = *ptr;
45    pthread_mutex_unlock(&sync_mutex);
46 
47    return r;
48 }
49 
50 WEAK uint64_t
__sync_sub_and_fetch_8(uint64_t * ptr,uint64_t val)51 __sync_sub_and_fetch_8(uint64_t *ptr, uint64_t val)
52 {
53    uint64_t r;
54 
55    pthread_mutex_lock(&sync_mutex);
56    *ptr -= val;
57    r = *ptr;
58    pthread_mutex_unlock(&sync_mutex);
59 
60    return r;
61 }
62 
63 WEAK uint64_t
__sync_val_compare_and_swap_8(uint64_t * ptr,uint64_t oldval,uint64_t newval)64 __sync_val_compare_and_swap_8(uint64_t *ptr, uint64_t oldval, uint64_t newval)
65 {
66    uint64_t r;
67 
68    pthread_mutex_lock(&sync_mutex);
69    r = *ptr;
70    if (*ptr == oldval)
71       *ptr = newval;
72    pthread_mutex_unlock(&sync_mutex);
73 
74    return r;
75 }
76 
77 #endif
78