| 1 | /* -*- C++ -*- */ |
| 2 | /*********************************************************************** |
| 3 | * director.swg |
| 4 | * |
| 5 | * This file contains support for director classes that proxy |
| 6 | * method calls from C++ to Ocaml extensions. |
| 7 | * |
| 8 | * Modified for Ocaml by : Art Yerkes |
| 9 | * Original Author : Mark Rose (mrose@stm.lbl.gov) |
| 10 | ************************************************************************/ |
| 11 | |
| 12 | #ifdef __cplusplus |
| 13 | |
| 14 | #include <string> |
| 15 | |
| 16 | namespace Swig { |
| 17 | /* base class for director exceptions */ |
| 18 | class DirectorException { |
| 19 | protected: |
| 20 | std::string swig_msg; |
| 21 | public: |
| 22 | DirectorException(const char* msg="") { |
| 23 | } |
| 24 | const char *getMessage() const { |
| 25 | return swig_msg.c_str(); |
| 26 | } |
| 27 | virtual ~DirectorException() {} |
| 28 | }; |
| 29 | |
| 30 | /* type mismatch in the return value from a python method call */ |
| 31 | class DirectorTypeMismatchException : public Swig::DirectorException { |
| 32 | public: |
| 33 | DirectorTypeMismatchException(const char* msg="") { |
| 34 | } |
| 35 | }; |
| 36 | |
| 37 | /* any python exception that occurs during a director method call */ |
| 38 | class DirectorMethodException : public Swig::DirectorException {}; |
| 39 | |
| 40 | /* attempt to call a pure virtual method via a director method */ |
| 41 | class DirectorPureVirtualException : public Swig::DirectorException {}; |
| 42 | |
| 43 | /* simple thread abstraction for pthreads on win32 */ |
| 44 | #ifdef __THREAD__ |
| 45 | #define __PTHREAD__ |
| 46 | #if defined(_WIN32) || defined(__WIN32__) |
| 47 | #define pthread_mutex_lock EnterCriticalSection |
| 48 | #define pthread_mutex_unlock LeaveCriticalSection |
| 49 | #define pthread_mutex_t CRITICAL_SECTION |
| 50 | #define MUTEX_INIT(var) CRITICAL_SECTION var |
| 51 | #else |
| 52 | #include <pthread.h> |
| 53 | #define MUTEX_INIT(var) pthread_mutex_t var = PTHREAD_MUTEX_INITIALIZER |
| 54 | #endif |
| 55 | #endif |
| 56 | |
| 57 | /* director base class */ |
| 58 | class Director { |
| 59 | private: |
| 60 | /* pointer to the wrapped ocaml object */ |
| 61 | CAML_VALUE swig_self; |
| 62 | /* flag indicating whether the object is owned by ocaml or c++ */ |
| 63 | mutable bool swig_disown_flag; |
| 64 | mutable bool swig_up; |
| 65 | |
| 66 | #ifdef __PTHREAD__ |
| 67 | /* locks for sharing the swig_up flag in a threaded environment */ |
| 68 | static pthread_mutex_t swig_mutex_up; |
| 69 | static bool swig_mutex_active; |
| 70 | static pthread_t swig_mutex_thread; |
| 71 | #endif |
| 72 | |
| 73 | /* reset the swig_up flag once the routing direction has been determined */ |
| 74 | #ifdef __PTHREAD__ |
| 75 | void swig_clear_up() const { |
| 76 | swig_up = false; |
| 77 | Swig::Director::swig_mutex_active = false; |
| 78 | pthread_mutex_unlock(&swig_mutex_up); |
| 79 | } |
| 80 | |
| 81 | #else |
| 82 | void swig_clear_up() const { |
| 83 | swig_up = false; |
| 84 | } |
| 85 | #endif |
| 86 | |
| 87 | public: |
| 88 | /* wrap a ocaml object, optionally taking ownership */ |
| 89 | Director(CAML_VALUE self) : swig_self(self), swig_disown_flag(false), swig_up( false ) { |
| 90 | register_global_root(&swig_self); |
| 91 | } |
| 92 | |
| 93 | /* discard our reference at destruction */ |
| 94 | virtual ~Director() { |
| 95 | remove_global_root(&swig_self); |
| 96 | swig_disown(); |
| 97 | // Disown is safe here because we're just divorcing a reference that |
| 98 | // points to us. |
| 99 | } |
| 100 | |
| 101 | /* return a pointer to the wrapped ocaml object */ |
| 102 | CAML_VALUE swig_get_self() const { |
| 103 | return swig_self; |
| 104 | } |
| 105 | |
| 106 | /* get the swig_up flag to determine if the method call should be routed |
| 107 | * to the c++ base class or through the wrapped ocaml object |
| 108 | */ |
| 109 | #ifdef __PTHREAD__ |
| 110 | bool swig_get_up( bool clear = true ) const { |
| 111 | if (Swig::Director::swig_mutex_active) { |
| 112 | if (pthread_equal(Swig::Director::swig_mutex_thread, pthread_self())) { |
| 113 | bool up = swig_up; |
| 114 | if( clear ) swig_clear_up(); |
| 115 | return up; |
| 116 | } |
| 117 | } |
| 118 | return false; |
| 119 | } |
| 120 | |
| 121 | #else |
| 122 | bool swig_get_up( bool clear = true ) const { |
| 123 | bool up = swig_up; |
| 124 | if( clear ) swig_up = false; |
| 125 | return up; |
| 126 | } |
| 127 | #endif |
| 128 | |
| 129 | /* set the swig_up flag if the next method call should be directed to |
| 130 | * the c++ base class rather than the wrapped ocaml object |
| 131 | */ |
| 132 | #ifdef __PTHREAD__ |
| 133 | void swig_set_up() const { |
| 134 | pthread_mutex_lock(&Swig::Director::swig_mutex_up); |
| 135 | Swig::Director::swig_mutex_thread = pthread_self(); |
| 136 | Swig::Director::swig_mutex_active = true; |
| 137 | swig_up = true; |
| 138 | } |
| 139 | #else |
| 140 | void swig_set_up() const { |
| 141 | swig_up = true; |
| 142 | } |
| 143 | #endif |
| 144 | |
| 145 | /* acquire ownership of the wrapped ocaml object (the sense of "disown" |
| 146 | * is from ocaml) */ |
| 147 | void swig_disown() const { |
| 148 | if (!swig_disown_flag) { |
| 149 | swig_disown_flag=true; |
| 150 | callback(*caml_named_value("caml_obj_disown"),swig_self); |
| 151 | } |
| 152 | } |
| 153 | }; |
| 154 | |
| 155 | #ifdef __PTHREAD__ |
| 156 | MUTEX_INIT(Swig::Director::swig_mutex_up); |
| 157 | pthread_t Swig::Director::swig_mutex_thread; |
| 158 | bool Swig::Director::swig_mutex_active = false; |
| 159 | #endif |
| 160 | |
| 161 | } |
| 162 | |
| 163 | #endif /* __cplusplus */ |