gold/gold-threads.cc

   1 // gold-threads.cc -- thread support for gold
   2
   3 // Copyright 2006, 2007 Free Software Foundation, Inc.
   4 // Written by Ian Lance Taylor <iant@google.com>.
   5
   6 // This file is part of gold.
   7
   8 // This program is free software; you can redistribute it and/or modify
   9 // it under the terms of the GNU General Public License as published by
  10 // the Free Software Foundation; either version 3 of the License, or
  11 // (at your option) any later version.
  12
  13 // This program is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17
  18 // You should have received a copy of the GNU General Public License
  19 // along with this program; if not, write to the Free Software
  20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  21 // MA 02110-1301, USA.
  22
  23 #include "gold.h"
  24
  25 #ifdef ENABLE_THREADS
  26 #include <pthread.h>
  27 #endif
  28
  29 #include "gold-threads.h"
  30
  31 namespace gold
  32 {
  33
  34 // Class Lock_impl.
  35
  36 class Lock_impl
  37 {
  38  public:
  39   Lock_impl();
  40   ~Lock_impl();
  41
  42   void acquire();
  43
  44   void release();
  45
  46 private:
  47   // This class can not be copied.
  48   Lock_impl(const Lock_impl&);
  49   Lock_impl& operator=(const Lock_impl&);
  50
  51   friend class Condvar_impl;
  52
  53 #ifdef ENABLE_THREADS
  54   pthread_mutex_t mutex_;
  55 #else
  56   bool acquired_;
  57 #endif
  58 };
  59
  60 #ifdef ENABLE_THREADS
  61
  62 Lock_impl::Lock_impl()
  63 {
  64   pthread_mutexattr_t attr;
  65   if (pthread_mutexattr_init(&attr) != 0)
  66     gold_fatal(_("pthead_mutextattr_init failed"), true);
  67 #ifdef PTHREAD_MUTEXT_ADAPTIVE_NP
  68   if (pthread_mutextattr_settype(&attr, PTHREAD_MUTEX_ADAPTIVE_NP) != 0)
  69     gold_fatal(_("pthread_mutextattr_settype failed"), true);
  70 #endif
  71
  72   if (pthread_mutex_init (&this->mutex_, &attr) != 0)
  73     gold_fatal(_("pthread_mutex_init failed"), true);
  74
  75   if (pthread_mutexattr_destroy(&attr) != 0)
  76     gold_fatal(_("pthread_mutexattr_destroy failed"), true);
  77 }
  78
  79 Lock_impl::~Lock_impl()
  80 {
  81   if (pthread_mutex_destroy(&this->mutex_) != 0)
  82     gold_fatal(_("pthread_mutex_destroy failed"), true);
  83 }
  84
  85 void
  86 Lock_impl::acquire()
  87 {
  88   if (pthread_mutex_lock(&this->mutex_) != 0)
  89     gold_fatal(_("pthread_mutex_lock failed"), true);
  90 }
  91
  92 void
  93 Lock_impl::release()
  94 {
  95   if (pthread_mutex_unlock(&this->mutex_) != 0)
  96     gold_fatal(_("pthread_mutex_unlock failed"), true);
  97 }
  98
  99 #else // !defined(ENABLE_THREADS)
 100
 101 Lock_impl::Lock_impl()
 102   : acquired_(false)
 103 {
 104 }
 105
 106 Lock_impl::~Lock_impl()
 107 {
 108   gold_assert(!this->acquired_);
 109 }
 110
 111 void
 112 Lock_impl::acquire()
 113 {
 114   gold_assert(!this->acquired_);
 115   this->acquired_ = true;
 116 }
 117
 118 void
 119 Lock_impl::release()
 120 {
 121   gold_assert(this->acquired_);
 122   this->acquired_ = false;
 123 }
 124
 125 #endif // !defined(ENABLE_THREADS)
 126
 127 // Methods for Lock class.
 128
 129 Lock::Lock()
 130 {
 131   this->lock_ = new Lock_impl;
 132 }
 133
 134 Lock::~Lock()
 135 {
 136   delete this->lock_;
 137 }
 138
 139 void
 140 Lock::acquire()
 141 {
 142   this->lock_->acquire();
 143 }
 144
 145 void
 146 Lock::release()
 147 {
 148   this->lock_->release();
 149 }
 150
 151 // Class Condvar_impl.
 152
 153 class Condvar_impl
 154 {
 155  public:
 156   Condvar_impl();
 157   ~Condvar_impl();
 158
 159   void wait(Lock_impl*);
 160   void signal();
 161
 162  private:
 163   // This class can not be copied.
 164   Condvar_impl(const Condvar_impl&);
 165   Condvar_impl& operator=(const Condvar_impl&);
 166
 167 #ifdef ENABLE_THREADS
 168   pthread_cond_t cond_;
 169 #endif
 170 };
 171
 172 #ifdef ENABLE_THREADS
 173
 174 Condvar_impl::Condvar_impl()
 175 {
 176   if (pthread_cond_init(&this->cond_, NULL) != 0)
 177     gold_fatal(_("pthread_cond_init failed"), true);
 178 }
 179
 180 Condvar_impl::~Condvar_impl()
 181 {
 182   if (pthread_cond_destroy(&this->cond_) != 0)
 183     gold_fatal(_("pthread_cond_destroy failed"), true);
 184 }
 185
 186 void
 187 Condvar_impl::wait(Lock_impl* li)
 188 {
 189   if (pthread_cond_wait(&this->cond_, &li->mutex_) != 0)
 190     gold_fatal(_("pthread_cond_wait failed"), true);
 191 }
 192
 193 void
 194 Condvar_impl::signal()
 195 {
 196   if (pthread_cond_signal(&this->cond_) != 0)
 197     gold_fatal(_("pthread_cond_signal failed"), true);
 198 }
 199
 200 #else // !defined(ENABLE_THREADS)
 201
 202 Condvar_impl::Condvar_impl()
 203 {
 204 }
 205
 206 Condvar_impl::~Condvar_impl()
 207 {
 208 }
 209
 210 void
 211 Condvar_impl::wait(Lock_impl* li)
 212 {
 213   gold_assert(li->acquired_);
 214 }
 215
 216 void
 217 Condvar_impl::signal()
 218 {
 219 }
 220
 221 #endif // !defined(ENABLE_THREADS)
 222
 223 // Methods for Condvar class.
 224
 225 Condvar::Condvar(Lock& lock)
 226   : lock_(lock)
 227 {
 228   this->condvar_ = new Condvar_impl;
 229 }
 230
 231 Condvar::~Condvar()
 232 {
 233   delete this->condvar_;
 234 }
 235
 236 void
 237 Condvar::wait()
 238 {
 239   this->condvar_->wait(this->lock_.get_impl());
 240 }
 241
 242 void
 243 Condvar::signal()
 244 {
 245   this->condvar_->signal();
 246 }
 247
 248 } // End namespace gold.