Rev 270 | Details | Compare with Previous | Last modification | View Log | SVN | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 270 | johboh | 1 | #ifndef __THREAD_H__ |
| 2 | #define __THREAD_H__ |
||
| 3 | |||
| 4 | class CThread |
||
| 5 | { |
||
| 6 | public: |
||
| 7 | /* |
||
| 8 | * Info: Default Constructor |
||
| 9 | */ |
||
| 10 | CThread() |
||
| 11 | { |
||
| 12 | m_pThreadFunc = CThread::EntryPoint; // Can call Detach() also. |
||
| 13 | } |
||
| 14 | |||
| 15 | /* |
||
| 16 | * Info: Plug Constructor |
||
| 17 | * |
||
| 18 | * Use this to migrate/port existing worker threads to objects immediately |
||
| 19 | * Although you lose the benefits of ThreadCTOR and ThreadDTOR. |
||
| 20 | */ |
||
| 21 | CThread(LPTHREAD_START_ROUTINE lpExternalRoutine) |
||
| 22 | { |
||
| 23 | Attach(lpExternalRoutine); |
||
| 24 | } |
||
| 25 | |||
| 26 | /* |
||
| 27 | * Info: Default Destructor |
||
| 28 | * |
||
| 29 | * I think it is wise to destroy the thread even if it is running, |
||
| 30 | * when the main thread reaches here. |
||
| 31 | */ |
||
| 32 | ~CThread() |
||
| 33 | { |
||
| 34 | if ( m_ThreadCtx.m_hThread ) |
||
| 35 | Stop(true); |
||
| 36 | } |
||
| 37 | /* |
||
| 38 | * Info: Starts the thread. |
||
| 39 | * |
||
| 40 | * This function starts the thread pointed by m_pThreadFunc with default attributes |
||
| 41 | */ |
||
| 42 | DWORD Start( void* arg = NULL ) |
||
| 43 | { |
||
| 44 | m_ThreadCtx.m_pUserData = arg; |
||
| 45 | m_ThreadCtx.m_hThread = CreateThread(NULL, 0, m_pThreadFunc, this, 0, &m_ThreadCtx.m_dwTID); |
||
| 46 | m_ThreadCtx.m_dwExitCode = (DWORD)-1; |
||
| 47 | |||
| 48 | return GetLastError(); |
||
| 49 | } |
||
| 50 | |||
| 51 | /* |
||
| 52 | * Info: Stops the thread. |
||
| 53 | * |
||
| 54 | * This function stops the current thread. |
||
| 55 | * We can force kill a thread which results in a TerminateThread. |
||
| 56 | */ |
||
| 57 | DWORD Stop ( bool bForceKill = false ) |
||
| 58 | { |
||
| 59 | if ( m_ThreadCtx.m_hThread ) |
||
| 60 | { |
||
| 61 | GetExitCodeThread(m_ThreadCtx.m_hThread, &m_ThreadCtx.m_dwExitCode); |
||
| 62 | |||
| 63 | if ( m_ThreadCtx.m_dwExitCode == STILL_ACTIVE && bForceKill ) |
||
| 64 | TerminateThread(m_ThreadCtx.m_hThread, DWORD(-1)); |
||
| 65 | |||
| 66 | m_ThreadCtx.m_hThread = NULL; |
||
| 67 | } |
||
| 68 | |||
| 69 | return m_ThreadCtx.m_dwExitCode; |
||
| 70 | } |
||
| 71 | |||
| 72 | /* |
||
| 73 | * Info: Starts the thread. |
||
| 74 | * |
||
| 75 | * This function starts the thread pointed by m_pThreadFunc with default attributes |
||
| 76 | */ |
||
| 77 | DWORD GetExitCode() const |
||
| 78 | { |
||
| 79 | if ( m_ThreadCtx.m_hThread ) |
||
| 80 | GetExitCodeThread(m_ThreadCtx.m_hThread, (LPDWORD)&m_ThreadCtx.m_dwExitCode); |
||
| 81 | return m_ThreadCtx.m_dwExitCode; |
||
| 82 | } |
||
| 83 | |||
| 84 | /* |
||
| 85 | * Info: Attaches a Thread Function |
||
| 86 | * |
||
| 87 | * Used primarily for porting but can serve in developing generic thread objects |
||
| 88 | */ |
||
| 89 | void Attach( LPTHREAD_START_ROUTINE lpThreadFunc ){ |
||
| 90 | m_pThreadFunc = lpThreadFunc; |
||
| 91 | } |
||
| 92 | |||
| 93 | /* |
||
| 94 | * Info: Detaches the Attached Thread Function |
||
| 95 | * |
||
| 96 | * Detaches the Attached Thread Function, If any. |
||
| 97 | * by resetting the thread function pointer to EntryPoint1 |
||
| 98 | */ |
||
| 99 | void Detach( void ){ |
||
| 100 | m_pThreadFunc = CThread::EntryPoint; |
||
| 101 | } |
||
| 102 | |||
| 103 | protected: |
||
| 104 | |||
| 105 | /* |
||
| 106 | * Info: DONT override this method. |
||
| 107 | * |
||
| 108 | * This function is like a standard template. |
||
| 109 | * Override if you are sure of what you are doing. |
||
| 110 | */ |
||
| 111 | static DWORD WINAPI EntryPoint( LPVOID pArg) |
||
| 112 | { |
||
| 113 | CThread *pParent = reinterpret_cast<CThread*>(pArg); |
||
| 114 | |||
| 115 | pParent->ThreadCtor(); |
||
| 116 | |||
| 117 | pParent->Run( pParent->m_ThreadCtx.m_pUserData ); |
||
| 118 | |||
| 119 | pParent->ThreadDtor(); |
||
| 120 | |||
| 121 | return STILL_ACTIVE; |
||
| 122 | } |
||
| 123 | |||
| 124 | /* |
||
| 125 | * Info: Override this method. |
||
| 126 | * |
||
| 127 | * This function should contain the body/code of your thread. |
||
| 128 | * Notice the signature is similar to that of any worker thread function |
||
| 129 | * except for the calling convention. |
||
| 130 | */ |
||
| 131 | virtual DWORD Run( LPVOID /* arg */ ) |
||
| 132 | { return m_ThreadCtx.m_dwExitCode; } |
||
| 133 | |||
| 134 | /* |
||
| 135 | * Info: Constructor-like function. |
||
| 136 | * |
||
| 137 | * Will be called by EntryPoint before executing the thread body. |
||
| 138 | * Override this function to provide your extra initialization. |
||
| 139 | * |
||
| 140 | * NOTE: do not confuse it with the classes constructor |
||
| 141 | */ |
||
| 142 | virtual void ThreadCtor(){ } |
||
| 143 | |||
| 144 | /* |
||
| 145 | * Info: Destructor-like function. |
||
| 146 | * |
||
| 147 | * Will be called by EntryPoint after executing the thread body. |
||
| 148 | * Override this function to provide your extra destruction. |
||
| 149 | * |
||
| 150 | * NOTE: do not confuse it with the classes constructor |
||
| 151 | */ |
||
| 152 | virtual void ThreadDtor(){ } |
||
| 153 | |||
| 154 | private: |
||
| 155 | /* |
||
| 156 | * Info: Thread Context Inner Class |
||
| 157 | * |
||
| 158 | * Every thread object needs to be associated with a set of values. |
||
| 159 | * like UserData Pointer, Handle, Thread ID etc. |
||
| 160 | * |
||
| 161 | * NOTE: This class can be enhanced to varying functionalities |
||
| 162 | * eg., |
||
| 163 | * * Members to hold StackSize |
||
| 164 | * * SECURITY_ATTRIBUTES member. |
||
| 165 | */ |
||
| 166 | class CThreadContext |
||
| 167 | { |
||
| 168 | public: |
||
| 169 | CThreadContext(){ |
||
| 170 | memset(this, 0, sizeof(this)); |
||
| 171 | } |
||
| 172 | |||
| 173 | /* |
||
| 174 | * Attributes Section |
||
| 175 | */ |
||
| 176 | public: |
||
| 177 | HANDLE m_hThread; // The Thread Handle |
||
| 178 | DWORD m_dwTID; // The Thread ID |
||
| 179 | LPVOID m_pUserData; // The user data pointer |
||
| 180 | LPVOID m_pParent; // The this pointer of the parent CThread object |
||
| 181 | DWORD m_dwExitCode; // The Exit Code of the thread |
||
| 182 | }; |
||
| 183 | |||
| 184 | /* |
||
| 185 | * Attributes Section |
||
| 186 | */ |
||
| 187 | protected: |
||
| 188 | /* |
||
| 189 | * Info: Members of CThread |
||
| 190 | */ |
||
| 191 | CThreadContext m_ThreadCtx; // The Thread Context member |
||
| 192 | LPTHREAD_START_ROUTINE m_pThreadFunc; // The Worker Thread Function Pointer |
||
| 193 | }; |
||
| 194 | |||
| 195 | #endif //__THREAD_H__ |