src/gtk1/threadsgi.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        threadsgi.cpp
   3 // Purpose:     wxThread (SGI) Implementation
   4 // Author:      Original from Wolfram Gloger/Guilhem Lavaux
   5 // Modified by:
   6 // Created:     04/22/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Wolfram Gloger (1996, 1997); Guilhem Lavaux (1998)
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11 #ifdef __GNUG__
  12 #pragma implementation "thread.h"
  13 #endif
  14
  15 #include <stdio.h>
  16 #include <unistd.h>
  17
  18 #include <signal.h>
  19 #include <sys/wait.h>
  20 #include <sys/prctl.h>
  21 #include "wx/thread.h"
  22 #include "wx/module.h"
  23 #include "wx/utils.h"
  24 #include "wx/log.h"
  25
  26 #include "gdk/gdk.h"
  27 #include "gtk/gtk.h"
  28
  29 enum thread_state
  30 {
  31   STATE_IDLE = 0,
  32   STATE_RUNNING,
  33   STATE_CANCELED,
  34   STATE_EXITED
  35 };
  36
  37 /////////////////////////////////////////////////////////////////////////////
  38 // Static variables
  39 /////////////////////////////////////////////////////////////////////////////
  40
  41 static int p_mainid;
  42 wxMutex *wxMainMutex;
  43
  44 #include "threadgui.inc"
  45
  46 /////////////////////////////////////////////////////////////////////////////
  47 // Unix implementations (SGI threads)
  48 /////////////////////////////////////////////////////////////////////////////
  49
  50 class wxMutexInternal {
  51 public:
  52   abilock_t p_mutex;
  53 };
  54
  55 wxMutex::wxMutex()
  56 {
  57   m_locked = 0;
  58   p_internal = new wxMutexInternal;
  59   init_lock(&(p_internal->p_mutex));
  60 }
  61
  62 wxMutex::~wxMutex()
  63 {
  64   if (m_locked > 0)
  65     wxLogDebug( "wxMutex warning: freeing a locked mutex (%d locks)\n", m_locked );
  66   delete p_internal;
  67 }
  68
  69 wxMutexError wxMutex::Lock()
  70 {
  71   spin_lock(&(p_internal->p_mutex));
  72   m_locked++;
  73   return wxMUTEX_NO_ERROR;
  74 }
  75
  76 wxMutexError wxMutex::TryLock()
  77 {
  78   if (acquire_lock(&(p_internal->p_mutex)) != 0)
  79     return wxMUTEX_BUSY;
  80   m_locked++;
  81   return wxMUTEX_NO_ERROR;
  82 }
  83
  84 wxMutexError wxMutex::Unlock()
  85 {
  86   if (m_locked == 0)
  87     return wxMUTEX_UNLOCKED;
  88   release_lock(&(p_internal->p_mutex));
  89   m_locked--;
  90   return wxMUTEX_NO_ERROR;
  91 }
  92
  93 // GL: Don't know how it works on SGI. Wolfram ?
  94
  95 wxCondition::wxCondition() {}
  96 wxCondition::~wxCondition() {}
  97 int wxCondition::Wait(wxMutex& WXUNUSED(mutex)) { return 0;}
  98 int wxCondition::Wait(wxMutex& WXUNUSED(mutex), unsigned long WXUNUSED(sec),
  99                       unsigned long WXUNUSED(nsec)) { return 0; }
 100 int wxCondition::Signal() { return 0; }
 101 int wxCondition::Broadcast() { return 0; }
 102
 103 class
 104 wxThreadPrivate {
 105 public:
 106   wxThreadPrivate() { thread_id = 0; state = STATE_IDLE; }
 107   ~wxThreadPrivate() {}
 108   static void SprocStart(void *ptr);
 109   static void SignalHandler(int sig);
 110 public:
 111   int state, thread_id;
 112   void* exit_status;
 113 };
 114
 115 void wxThreadPrivate::SprocStart(void *ptr)
 116 {
 117   void* status;
 118
 119   wxThread *thr = (wxThread *)ptr;
 120
 121   thr->p_internal->thread_id = getpid();
 122   thr->p_internal->exit_status = 0;
 123   status = thr->Entry();
 124   thr->Exit(status);
 125 }
 126
 127 void wxThread::Exit(void* status)
 128 {
 129   wxThread* ptr = this;
 130   THREAD_SEND_EXIT_MSG(ptr);
 131   p_internal->state = STATE_EXITED;
 132   p_internal->exit_status = status;
 133   _exit(0);
 134 }
 135
 136 wxThreadError wxThread::Create()
 137 {
 138   if (p_internal->state != STATE_IDLE)
 139     return wxTHREAD_RUNNING;
 140   p_internal->state = STATE_RUNNING;
 141   if (sproc(p_internal->SprocStart, PR_SALL, this) < 0) {
 142     p_internal->state = STATE_IDLE;
 143     return wxTHREAD_NO_RESOURCE;
 144   }
 145   return wxTHREAD_NO_ERROR;
 146 }
 147
 148 wxThreadError wxThread::Destroy()
 149 {
 150   if (p_internal->state == STATE_RUNNING)
 151     p_internal->state = STATE_CANCELED;
 152
 153   return wxTHREAD_NO_ERROR;
 154 }
 155
 156 wxThreadError wxThread::Pause()
 157 {
 158   return wxTHREAD_NO_ERROR;
 159 }
 160
 161 wxThreadError wxThread::Resume()
 162 {
 163   return wxTHREAD_NO_ERROR;
 164 }
 165
 166 void *wxThread::Join()
 167 {
 168   if (p_internal->state != STATE_IDLE) {
 169     bool do_unlock = wxThread::IsMain();
 170     int stat;
 171
 172     if (do_unlock)
 173       wxMainMutex->Unlock();
 174     waitpid(p_internal->thread_id, &stat, 0);
 175     if (do_unlock)
 176       wxMainMutex->Lock();
 177     if (!WIFEXITED(stat) && !WIFSIGNALED(stat))
 178       return 0;
 179     p_internal->state = STATE_IDLE;
 180     return p_internal->exit_status;
 181   }
 182   return 0;
 183 }
 184
 185 unsigned long wxThread::GetID() const
 186 {
 187   return (unsigned long)p_internal->thread_id;
 188 }
 189
 190 void wxThread::TestDestroy()
 191 {
 192   if (p_internal->state == STATE_CANCELED) {
 193     p_internal->exit_status = 0;
 194     _exit(0);
 195   }
 196 }
 197
 198 void wxThread::SetPriority(int prio)
 199 {
 200 }
 201
 202 int wxThread::GetPriority() const
 203 {
 204     return 0;
 205 }
 206
 207 bool wxThread::IsMain()
 208 {
 209   return (int)getpid() == main_id;
 210 }
 211
 212 bool wxThread::IsAlive() const
 213 {
 214   return (p_internal->state == STATE_RUNNING);
 215 }
 216
 217 bool wxThread::IsRunning() const
 218 {
 219   return (p_internal->state == STATE_RUNNING);
 220 }
 221
 222 wxThread::wxThread()
 223 {
 224   p_internal = new wxThreadPrivate();
 225 }
 226
 227 wxThread::~wxThread()
 228 {
 229   Cancel();
 230   Join();
 231   delete p_internal;
 232 }
 233
 234 // The default callback just joins the thread and throws away the result.
 235 void wxThread::OnExit()
 236 {
 237   Join();
 238 }
 239
 240 // Global initialization
 241 class wxThreadModule : public wxModule {
 242   DECLARE_DYNAMIC_CLASS(wxThreadModule)
 243 public:
 244   virtual bool OnInit() {
 245     wxMainMutex = new wxMutex();
 246     wxThreadGuiInit();
 247     p_mainid = (int)getpid();
 248     wxMainMutex->Lock();
 249   }
 250
 251   virtual void OnExit() {
 252     wxMainMutex->Unlock();
 253     wxThreadGuiExit();
 254     delete wxMainMutex;
 255   }
 256 };
 257
 258 IMPLEMENT_DYNAMIC_CLASS(wxThreadModule, wxModule)