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
|
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <sys/types.h>
#include "ThreadingUtil.h"
#include "LibCSymTable.h"
#ifdef THREADED
// ****************************************************************************
// Mutex wrapper
struct Mutex::Impl{
Impl(){
LIBC_SYMBOLS.pthread_mutex_init(&mut_, 0);
}
~Impl(){
LIBC_SYMBOLS.pthread_mutex_destroy(&mut_);
}
pthread_mutex_t mut_;
};
Mutex::Mutex():impl_(new Impl) {}
Mutex::~Mutex() { delete impl_;}
void Mutex::acquire() {
LIBC_SYMBOLS.pthread_mutex_lock(&impl_->mut_);
}
void Mutex::release() {
LIBC_SYMBOLS.pthread_mutex_unlock(&impl_->mut_);
}
// ****************************************************************************
// Atomics
int32_t atomic_post_incr(volatile int32_t* operand, int32_t incr)
{
#if defined(__GNUC__)
return __sync_fetch_and_add(operand,incr);
#else
int32_t result;
__asm__ __volatile__(
"lock xaddl %0,%1\n"
: "=r"(result), "=m"(*operand)
: "0"(incr)
: "memory");
return result;
#endif
}
int32_t atomic_fetch_store(volatile int32_t *ptr, int32_t value)
{
#if defined(__GNUC__)
return __sync_lock_test_and_set(ptr,value);
#else
int32_t result;
__asm__ __volatile__("lock xchgl %0,%1\n"
: "=r"(result), "=m"(*ptr)
: "0"(value)
: "memory");
return result;
#endif
}
#else
int32_t atomic_post_incr(volatile int32_t* operand, int32_t incr){
int32_t v=*operand;
*operand+=incr;
return v;
}
int32_t atomic_fetch_store(volatile int32_t *ptr, int32_t value)
{
int32_t result=*ptr;
*ptr=value;
return result;
}
#endif // THREADED
|
