1 /* 2 * Copyright (c) 1999-2000, Eric Moon. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions, and the following disclaimer. 11 * 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions, and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF TITLE, NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 23 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR 27 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 32 // BasicThread.h 33 // based on ThreadPrimitive from the Be Newsletter 34 // 35 // HISTORY 36 // e.moon 12jul99: now in cortex namespace 37 // - The stop mechanism has changed a bit; it's now up to the 38 // run() implementation to indicate that it has completed by 39 // calling done(). 40 // 41 // e.moon 11may99: brought into the beDub support kit 42 43 #ifndef __BasicThread_H__ 44 #define __BasicThread_H__ 45 46 #include <Debug.h> 47 #include <KernelKit.h> 48 #include <String.h> 49 50 51 #include "cortex_defs.h" 52 __BEGIN_CORTEX_NAMESPACE 53 54 class BasicThread { 55 56 protected: // hooks 57 virtual void run()=0; 58 59 public: // ctor/dtor 60 virtual ~BasicThread() { 61 62 if(m_thread > 0) { 63 kill(); 64 } 65 } 66 67 BasicThread( 68 int32 priority=B_LOW_PRIORITY, 69 const char* name=0, 70 bool killOnDelete=true) : 71 72 m_thread(-1), 73 m_priority(priority), 74 m_name(name ? name : "BasicThread [?]"), 75 m_running(false), 76 m_stopping(false) {} 77 78 bool running() const { return m_running; } 79 bool stopping() const { return m_stopping; } 80 81 thread_id thread() const { return m_thread; } 82 const char* name() const { return m_name.String(); } 83 84 public: // operations 85 status_t start() { 86 87 if(running()) 88 return B_ERROR; 89 90 m_thread = spawn_thread( 91 &BasicThread::Run, 92 m_name.String(), 93 m_priority, 94 this); 95 96 status_t err = resume_thread(m_thread); 97 if(err == B_OK) 98 m_running = true; 99 return err; 100 } 101 102 // reworked 12jul99 e.moon 103 status_t stop(bool wait=true) { 104 105 if(!running()) 106 return B_ERROR; 107 108 thread_id thread = m_thread; // +++++ is this safe? 109 if(thread <= 0) 110 return B_OK; 111 112 // signal stop 113 m_stopping = true; 114 115 if(wait) { 116 status_t ret; 117 while(wait_for_thread(thread, &ret) == B_INTERRUPTED) { 118 PRINT(("stopping thread %ld: B_INTERRUPTED\n", thread)); 119 } 120 } 121 122 return B_OK; 123 } 124 125 protected: // internal methods 126 127 // Blunt force trauma. 128 // added 12jul99 e.moon 129 status_t kill() { 130 if(m_thread <= 0) 131 return B_ERROR; 132 133 kill_thread(m_thread); 134 135 m_thread = -1; 136 m_running = false; 137 m_stopping = false; 138 return B_OK; 139 } 140 141 // Call this method at the end of your run() implementation. 142 // added 12jul99 e.moon 143 void done() { 144 m_running = false; 145 m_stopping = false; 146 m_thread = -1; 147 } 148 149 private: // static impl. methods 150 static status_t Run(void* user) { 151 152 BasicThread* instance = static_cast<BasicThread*>(user); 153 instance->run(); 154 return B_OK; 155 } 156 157 private: // impl members 158 thread_id m_thread; 159 int32 m_priority; 160 BString m_name; 161 162 bool m_running; 163 bool m_stopping; 164 }; 165 166 __END_CORTEX_NAMESPACE 167 #endif /* __BasicThread_H__ */ 168