src/gtk1/threadsgi.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk1/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
  12 // For compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #include "wx/thread.h"
  16
  17 #ifndef WX_PRECOMP
  18     #include "wx/log.h"
  19     #include "wx/utils.h"
  20 #endif
  21
  22 #include <stdio.h>
  23 #include <unistd.h>
  24
  25 #include <signal.h>
  26 #include <sys/wait.h>
  27 #include <sys/prctl.h>
  28 #include "wx/module.h"
  29
  30 #include "gdk/gdk.h"
  31 #include "gtk/gtk.h"
  32
  33 enum thread_state
  34 {
  35   STATE_IDLE = 0,
  36   STATE_RUNNING,
  37   STATE_CANCELED,
  38   STATE_EXITED
  39 };
  40
  41 /////////////////////////////////////////////////////////////////////////////
  42 // Static variables
  43 /////////////////////////////////////////////////////////////////////////////
  44
  45 static int p_mainid;
  46 wxMutex *wxMainMutex;
  47
  48 #include "threadgui.inc"
  49
  50 /////////////////////////////////////////////////////////////////////////////
  51 // Unix implementations (SGI threads)
  52 /////////////////////////////////////////////////////////////////////////////
  53
  54 class wxMutexInternal {
  55 public:
  56   abilock_t p_mutex;
  57 };
  58
  59 wxMutex::wxMutex()
  60 {
  61   m_locked = 0;
  62   p_internal = new wxMutexInternal;
  63   init_lock(&(p_internal->p_mutex));
  64 }
  65
  66 wxMutex::~wxMutex()
  67 {
  68   if (m_locked > 0)
  69     wxLogDebug( "wxMutex warning: freeing a locked mutex (%d locks)\n", m_locked );
  70   delete p_internal;
  71 }
  72
  73 wxMutexError wxMutex::Lock()
  74 {
  75   spin_lock(&(p_internal->p_mutex));
  76   m_locked++;
  77   return wxMUTEX_NO_ERROR;
  78 }
  79
  80 wxMutexError wxMutex::TryLock()
  81 {
  82   if (acquire_lock(&(p_internal->p_mutex)) != 0)
  83     return wxMUTEX_BUSY;
  84   m_locked++;
  85   return wxMUTEX_NO_ERROR;
  86 }
  87
  88 wxMutexError wxMutex::Unlock()
  89 {
  90   if (m_locked == 0)
  91     return wxMUTEX_UNLOCKED;
  92   release_lock(&(p_internal->p_mutex));
  93   m_locked--;
  94   return wxMUTEX_NO_ERROR;
  95 }
  96
  97 // GL: Don't know how it works on SGI. Wolfram ?
  98
  99 wxCondition::wxCondition() {}
 100 wxCondition::~wxCondition() {}
 101 int wxCondition::Wait(wxMutex& WXUNUSED(mutex)) { return 0;}
 102 int wxCondition::Wait(wxMutex& WXUNUSED(mutex), unsigned long WXUNUSED(sec),
 103                       unsigned long WXUNUSED(nsec)) { return 0; }
 104 int wxCondition::Signal() { return 0; }
 105 int wxCondition::Broadcast() { return 0; }
 106
 107 class
 108 wxThreadPrivate {
 109 public:
 110   wxThreadPrivate() { thread_id = 0; state = STATE_IDLE; }
 111   ~wxThreadPrivate() {}
 112   static void SprocStart(void *ptr);
 113   static void SignalHandler(int sig);
 114 public:
 115   int state, thread_id;
 116   void* exit_status;
 117 };
 118
 119 void wxThreadPrivate::SprocStart(void *ptr)
 120 {
 121   void* status;
 122
 123   wxThread *thr = (wxThread *)ptr;
 124
 125   thr->p_internal->thread_id = getpid();
 126   thr->p_internal->exit_status = 0;
 127   status = thr->Entry();
 128   thr->Exit(status);
 129 }
 130
 131 void wxThread::Exit(void* status)
 132 {
 133   wxThread* ptr = this;
 134   THREAD_SEND_EXIT_MSG(ptr);
 135   p_internal->state = STATE_EXITED;
 136   p_internal->exit_status = status;
 137   _exit(0);
 138 }
 139
 140 wxThreadError wxThread::Create()
 141 {
 142   if (p_internal->state != STATE_IDLE)
 143     return wxTHREAD_RUNNING;
 144   p_internal->state = STATE_RUNNING;
 145   if (sproc(p_internal->SprocStart, PR_SALL, this) < 0) {
 146     p_internal->state = STATE_IDLE;
 147     return wxTHREAD_NO_RESOURCE;
 148   }
 149   return wxTHREAD_NO_ERROR;
 150 }
 151
 152 wxThreadError wxThread::Destroy()
 153 {
 154   if (p_internal->state == STATE_RUNNING)
 155     p_internal->state = STATE_CANCELED;
 156
 157   return wxTHREAD_NO_ERROR;
 158 }
 159
 160 wxThreadError wxThread::Pause()
 161 {
 162   return wxTHREAD_NO_ERROR;
 163 }
 164
 165 wxThreadError wxThread::Resume()
 166 {
 167   return wxTHREAD_NO_ERROR;
 168 }
 169
 170 void *wxThread::Join()
 171 {
 172   if (p_internal->state != STATE_IDLE) {
 173     bool do_unlock = wxThread::IsMain();
 174     int stat;
 175
 176     if (do_unlock)
 177       wxMainMutex->Unlock();
 178     waitpid(p_internal->thread_id, &stat, 0);
 179     if (do_unlock)
 180       wxMainMutex->Lock();
 181     if (!WIFEXITED(stat) && !WIFSIGNALED(stat))
 182       return 0;
 183     p_internal->state = STATE_IDLE;
 184     return p_internal->exit_status;
 185   }
 186   return 0;
 187 }
 188
 189 unsigned long wxThread::GetID() const
 190 {
 191   return (unsigned long)p_internal->thread_id;
 192 }
 193
 194 void wxThread::TestDestroy()
 195 {
 196   if (p_internal->state == STATE_CANCELED) {
 197     p_internal->exit_status = 0;
 198     _exit(0);
 199   }
 200 }
 201
 202 void wxThread::SetPriority(int prio)
 203 {
 204 }
 205
 206 int wxThread::GetPriority() const
 207 {
 208     return 0;
 209 }
 210
 211 bool wxThread::IsMain()
 212 {
 213   return (int)getpid() == main_id;
 214 }
 215
 216 bool wxThread::IsAlive() const
 217 {
 218   return (p_internal->state == STATE_RUNNING);
 219 }
 220
 221 bool wxThread::IsRunning() const
 222 {
 223   return (p_internal->state == STATE_RUNNING);
 224 }
 225
 226 wxThread::wxThread()
 227 {
 228   p_internal = new wxThreadPrivate();
 229 }
 230
 231 wxThread::~wxThread()
 232 {
 233   Cancel();
 234   Join();
 235   delete p_internal;
 236 }
 237
 238 // The default callback just joins the thread and throws away the result.
 239 void wxThread::OnExit()
 240 {
 241   Join();
 242 }
 243
 244 // Global initialization
 245
 246 class wxThreadModule : public wxModule
 247 {
 248 public:
 249     virtual bool OnInit();
 250     virtual void OnExit();
 251
 252 private:
 253     DECLARE_DYNAMIC_CLASS(wxThreadModule)
 254 };
 255
 256 IMPLEMENT_DYNAMIC_CLASS(wxThreadModule, wxModule)
 257
 258 bool wxThreadModule::OnInit()
 259 {
 260     wxMainMutex = new wxMutex();
 261     wxThreadGuiInit();
 262     p_mainid = (int)getpid();
 263     wxMainMutex->Lock();
 264     return true;
 265 }
 266
 267 void wxThreadModule::OnExit()
 268 {
 269     wxMainMutex->Unlock();
 270     wxThreadGuiExit();
 271     delete wxMainMutex;
 272 }