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
|
/*
* Copyright (C) 2008-2009 Tobias Brunner
* Copyright (C) 2008 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
/**
* @defgroup mutex mutex
* @{ @ingroup threading
*/
#ifndef THREADING_MUTEX_H_
#define THREADING_MUTEX_H_
typedef struct mutex_t mutex_t;
typedef enum mutex_type_t mutex_type_t;
#include "condvar.h"
#ifdef __APPLE__
/* on Mac OS X 10.5 several system calls we use are no cancellation points.
* fortunately, select isn't one of them, so we wrap some of the others with
* calls to select(2).
*/
#include <sys/socket.h>
#include <sys/select.h>
#define WRAP_WITH_SELECT(func, socket, ...)\
fd_set rfds; FD_ZERO(&rfds); FD_SET(socket, &rfds);\
if (select(socket + 1, &rfds, NULL, NULL, NULL) <= 0) { return -1; }\
return func(socket, __VA_ARGS__)
static inline int cancellable_accept(int socket, struct sockaddr *address,
socklen_t *address_len)
{
WRAP_WITH_SELECT(accept, socket, address, address_len);
}
#define accept cancellable_accept
static inline int cancellable_recvfrom(int socket, void *buffer, size_t length,
int flags, struct sockaddr *address, socklen_t *address_len)
{
WRAP_WITH_SELECT(recvfrom, socket, buffer, length, flags, address, address_len);
}
#define recvfrom cancellable_recvfrom
#endif /* __APPLE__ */
/**
* Type of mutex.
*/
enum mutex_type_t {
/** default mutex */
MUTEX_TYPE_DEFAULT = 0,
/** allow recursive locking of the mutex */
MUTEX_TYPE_RECURSIVE = 1,
};
/**
* Mutex wrapper implements simple, portable and advanced mutex functions.
*/
struct mutex_t {
/**
* Acquire the lock to the mutex.
*/
void (*lock)(mutex_t *this);
/**
* Release the lock on the mutex.
*/
void (*unlock)(mutex_t *this);
/**
* Destroy a mutex instance.
*/
void (*destroy)(mutex_t *this);
};
/**
* Create a mutex instance.
*
* @param type type of mutex to create
* @return unlocked mutex instance
*/
mutex_t *mutex_create(mutex_type_t type);
#endif /** THREADING_MUTEX_H_ @} */
|
