Commit | Line | Data |
---|---|---|
920dae64 AT |
1 | /*********************************************************************** |
2 | * director.swg | |
3 | * | |
4 | * This file contains support for director classes that proxy | |
5 | * method calls from C++ to Ruby extensions. | |
6 | * | |
7 | * Author : Lyle Johnson (lyle@users.sourceforge.net) | |
8 | * Based on the original Python implementation by | |
9 | * Mark Rose (mrose@stm.lbl.gov). | |
10 | ************************************************************************/ | |
11 | ||
12 | #ifdef __cplusplus | |
13 | ||
14 | #include <string> | |
15 | ||
16 | namespace Swig { | |
17 | struct body_args { | |
18 | VALUE recv; | |
19 | ID id; | |
20 | int argc; | |
21 | VALUE *argv; | |
22 | }; | |
23 | ||
24 | /* Base class for director exceptions */ | |
25 | class DirectorException { | |
26 | protected: | |
27 | VALUE swig_error; | |
28 | protected: | |
29 | DirectorException(VALUE error=Qnil) : swig_error(error) {} | |
30 | public: | |
31 | VALUE getType() const { | |
32 | return CLASS_OF(swig_error); | |
33 | } | |
34 | VALUE getError() const { | |
35 | return swig_error; | |
36 | } | |
37 | virtual ~DirectorException() {} | |
38 | }; | |
39 | ||
40 | /* Type mismatch in the return value from a Ruby method call */ | |
41 | class DirectorTypeMismatchException : public Swig::DirectorException { | |
42 | public: | |
43 | DirectorTypeMismatchException(const char *msg="") { | |
44 | VALUE str = rb_str_new2("Swig director type mismatch: "); | |
45 | rb_str_concat(str, rb_str_new2(msg)); | |
46 | swig_error = rb_exc_new3(rb_eTypeError, str); | |
47 | } | |
48 | }; | |
49 | ||
50 | /* Any Ruby exception that occurs during a director method call */ | |
51 | class DirectorMethodException : public Swig::DirectorException { | |
52 | public: | |
53 | DirectorMethodException(VALUE error) : Swig::DirectorException(error) {} | |
54 | }; | |
55 | ||
56 | /* Attempted to call a pure virtual method via a director method */ | |
57 | class DirectorPureVirtualException : public Swig::DirectorException {}; | |
58 | ||
59 | ||
60 | /* Simple thread abstraction for pthreads on win32 */ | |
61 | #ifdef __THREAD__ | |
62 | #define __PTHREAD__ | |
63 | #if defined(_WIN32) || defined(__WIN32__) | |
64 | #define pthread_mutex_lock EnterCriticalSection | |
65 | #define pthread_mutex_unlock LeaveCriticalSection | |
66 | #define pthread_mutex_t CRITICAL_SECTION | |
67 | #define MUTEX_INIT(var) CRITICAL_SECTION var | |
68 | #else | |
69 | #include <pthread.h> | |
70 | #define MUTEX_INIT(var) pthread_mutex_t var = PTHREAD_MUTEX_INITIALIZER | |
71 | #endif | |
72 | #endif | |
73 | ||
74 | /* director base class */ | |
75 | class Director { | |
76 | private: | |
77 | /* pointer to the wrapped Ruby object */ | |
78 | VALUE swig_self; | |
79 | /* flag indicating whether the object is owned by Ruby or c++ */ | |
80 | mutable bool swig_disown_flag; | |
81 | /* shared flag for breaking recursive director calls */ | |
82 | static bool swig_up; | |
83 | ||
84 | #ifdef __PTHREAD__ | |
85 | /* locks for sharing the swig_up flag in a threaded environment */ | |
86 | static pthread_mutex_t swig_mutex_up; | |
87 | static bool swig_mutex_active; | |
88 | static pthread_t swig_mutex_thread; | |
89 | #endif | |
90 | ||
91 | /* reset the swig_up flag once the routing direction has been determined */ | |
92 | #ifdef __PTHREAD__ | |
93 | void swig_clear_up() const { | |
94 | Swig::Director::swig_up = false; | |
95 | Swig::Director::swig_mutex_active = false; | |
96 | pthread_mutex_unlock(&swig_mutex_up); | |
97 | } | |
98 | #else | |
99 | void swig_clear_up() const { | |
100 | Swig::Director::swig_up = false; | |
101 | } | |
102 | #endif | |
103 | ||
104 | public: | |
105 | /* wrap a Ruby object, optionally taking ownership */ | |
106 | Director(VALUE self) : swig_self(self), swig_disown_flag(false) { | |
107 | } | |
108 | ||
109 | /* discard our reference at destruction */ | |
110 | virtual ~Director() { | |
111 | } | |
112 | ||
113 | /* return a pointer to the wrapped Ruby object */ | |
114 | VALUE swig_get_self() const { | |
115 | return swig_self; | |
116 | } | |
117 | ||
118 | /* get the swig_up flag to determine if the method call should be routed | |
119 | * to the c++ base class or through the wrapped Ruby object | |
120 | */ | |
121 | #ifdef __PTHREAD__ | |
122 | bool swig_get_up() const { | |
123 | if (Swig::Director::swig_mutex_active) { | |
124 | if (pthread_equal(Swig::Director::swig_mutex_thread, pthread_self())) { | |
125 | bool up = swig_up; | |
126 | swig_clear_up(); | |
127 | return up; | |
128 | } | |
129 | } | |
130 | return false; | |
131 | } | |
132 | #else | |
133 | bool swig_get_up() const { | |
134 | bool up = swig_up; | |
135 | swig_up = false; | |
136 | return up; | |
137 | } | |
138 | #endif | |
139 | ||
140 | /* set the swig_up flag if the next method call should be directed to | |
141 | * the c++ base class rather than the wrapped Ruby object | |
142 | */ | |
143 | #ifdef __PTHREAD__ | |
144 | void swig_set_up() const { | |
145 | pthread_mutex_lock(&Swig::Director::swig_mutex_up); | |
146 | Swig::Director::swig_mutex_thread = pthread_self(); | |
147 | Swig::Director::swig_mutex_active = true; | |
148 | Swig::Director::swig_up = true; | |
149 | } | |
150 | #else | |
151 | void swig_set_up() const { | |
152 | Swig::Director::swig_up = true; | |
153 | } | |
154 | #endif | |
155 | ||
156 | /* acquire ownership of the wrapped Ruby object (the sense of "disown" | |
157 | * is from Ruby) */ | |
158 | void swig_disown() const { | |
159 | if (!swig_disown_flag) { | |
160 | swig_disown_flag = true; | |
161 | } | |
162 | } | |
163 | }; | |
164 | ||
165 | bool Swig::Director::swig_up = false; | |
166 | ||
167 | #ifdef __PTHREAD__ | |
168 | MUTEX_INIT(Swig::Director::swig_mutex_up); | |
169 | pthread_t Swig::Director::swig_mutex_thread; | |
170 | bool Swig::Director::swig_mutex_active = false; | |
171 | #endif | |
172 | ||
173 | } | |
174 | ||
175 | #endif /* __cplusplus */ | |
176 | ||
177 |