| 1 | // gold-threads.cc -- thread support for gold |
| 2 | |
| 3 | #include "gold.h" |
| 4 | |
| 5 | #ifdef ENABLE_THREADS |
| 6 | #include <pthread.h> |
| 7 | #endif |
| 8 | |
| 9 | #include "gold-threads.h" |
| 10 | |
| 11 | namespace gold |
| 12 | { |
| 13 | |
| 14 | // Class Lock_impl. |
| 15 | |
| 16 | class Lock_impl |
| 17 | { |
| 18 | public: |
| 19 | Lock_impl(); |
| 20 | ~Lock_impl(); |
| 21 | |
| 22 | void acquire(); |
| 23 | |
| 24 | void release(); |
| 25 | |
| 26 | private: |
| 27 | // This class can not be copied. |
| 28 | Lock_impl(const Lock_impl&); |
| 29 | Lock_impl& operator=(const Lock_impl&); |
| 30 | |
| 31 | friend class Condvar_impl; |
| 32 | |
| 33 | #ifdef ENABLE_THREADS |
| 34 | pthread_mutex_t mutex_; |
| 35 | #else |
| 36 | bool acquired_; |
| 37 | #endif |
| 38 | }; |
| 39 | |
| 40 | #ifdef ENABLE_THREADS |
| 41 | |
| 42 | Lock_impl::Lock_impl() |
| 43 | { |
| 44 | pthread_mutexattr_t attr; |
| 45 | if (pthread_mutexattr_init(&attr) != 0) |
| 46 | gold_fatal(_("pthead_mutextattr_init failed"), true); |
| 47 | #ifdef PTHREAD_MUTEXT_ADAPTIVE_NP |
| 48 | if (pthread_mutextattr_settype(&attr, PTHREAD_MUTEX_ADAPTIVE_NP) != 0) |
| 49 | gold_fatal(_("pthread_mutextattr_settype failed"), true); |
| 50 | #endif |
| 51 | |
| 52 | if (pthread_mutex_init (&this->mutex_, &attr) != 0) |
| 53 | gold_fatal(_("pthread_mutex_init failed"), true); |
| 54 | |
| 55 | if (pthread_mutexattr_destroy(&attr) != 0) |
| 56 | gold_fatal(_("pthread_mutexattr_destroy failed"), true); |
| 57 | } |
| 58 | |
| 59 | Lock_impl::~Lock_impl() |
| 60 | { |
| 61 | if (pthread_mutex_destroy(&this->mutex_) != 0) |
| 62 | gold_fatal(_("pthread_mutex_destroy failed"), true); |
| 63 | } |
| 64 | |
| 65 | void |
| 66 | Lock_impl::acquire() |
| 67 | { |
| 68 | if (pthread_mutex_lock(&this->mutex_) != 0) |
| 69 | gold_fatal(_("pthread_mutex_lock failed"), true); |
| 70 | } |
| 71 | |
| 72 | void |
| 73 | Lock_impl::release() |
| 74 | { |
| 75 | if (pthread_mutex_unlock(&this->mutex_) != 0) |
| 76 | gold_fatal(_("pthread_mutex_unlock failed"), true); |
| 77 | } |
| 78 | |
| 79 | #else // !defined(ENABLE_THREADS) |
| 80 | |
| 81 | Lock_impl::Lock_impl() |
| 82 | : acquired_(false) |
| 83 | { |
| 84 | } |
| 85 | |
| 86 | Lock_impl::~Lock_impl() |
| 87 | { |
| 88 | gold_assert(!this->acquired_); |
| 89 | } |
| 90 | |
| 91 | void |
| 92 | Lock_impl::acquire() |
| 93 | { |
| 94 | gold_assert(!this->acquired_); |
| 95 | this->acquired_ = true; |
| 96 | } |
| 97 | |
| 98 | void |
| 99 | Lock_impl::release() |
| 100 | { |
| 101 | gold_assert(this->acquired_); |
| 102 | this->acquired_ = false; |
| 103 | } |
| 104 | |
| 105 | #endif // !defined(ENABLE_THREADS) |
| 106 | |
| 107 | // Methods for Lock class. |
| 108 | |
| 109 | Lock::Lock() |
| 110 | { |
| 111 | this->lock_ = new Lock_impl; |
| 112 | } |
| 113 | |
| 114 | Lock::~Lock() |
| 115 | { |
| 116 | delete this->lock_; |
| 117 | } |
| 118 | |
| 119 | void |
| 120 | Lock::acquire() |
| 121 | { |
| 122 | this->lock_->acquire(); |
| 123 | } |
| 124 | |
| 125 | void |
| 126 | Lock::release() |
| 127 | { |
| 128 | this->lock_->release(); |
| 129 | } |
| 130 | |
| 131 | // Class Condvar_impl. |
| 132 | |
| 133 | class Condvar_impl |
| 134 | { |
| 135 | public: |
| 136 | Condvar_impl(); |
| 137 | ~Condvar_impl(); |
| 138 | |
| 139 | void wait(Lock_impl*); |
| 140 | void signal(); |
| 141 | |
| 142 | private: |
| 143 | // This class can not be copied. |
| 144 | Condvar_impl(const Condvar_impl&); |
| 145 | Condvar_impl& operator=(const Condvar_impl&); |
| 146 | |
| 147 | #ifdef ENABLE_THREADS |
| 148 | pthread_cond_t cond_; |
| 149 | #endif |
| 150 | }; |
| 151 | |
| 152 | #ifdef ENABLE_THREADS |
| 153 | |
| 154 | Condvar_impl::Condvar_impl() |
| 155 | { |
| 156 | if (pthread_cond_init(&this->cond_, NULL) != 0) |
| 157 | gold_fatal(_("pthread_cond_init failed"), true); |
| 158 | } |
| 159 | |
| 160 | Condvar_impl::~Condvar_impl() |
| 161 | { |
| 162 | if (pthread_cond_destroy(&this->cond_) != 0) |
| 163 | gold_fatal(_("pthread_cond_destroy failed"), true); |
| 164 | } |
| 165 | |
| 166 | void |
| 167 | Condvar_impl::wait(Lock_impl* li) |
| 168 | { |
| 169 | if (pthread_cond_wait(&this->cond_, &li->mutex_) != 0) |
| 170 | gold_fatal(_("pthread_cond_wait failed"), true); |
| 171 | } |
| 172 | |
| 173 | void |
| 174 | Condvar_impl::signal() |
| 175 | { |
| 176 | if (pthread_cond_signal(&this->cond_) != 0) |
| 177 | gold_fatal(_("pthread_cond_signal failed"), true); |
| 178 | } |
| 179 | |
| 180 | #else // !defined(ENABLE_THREADS) |
| 181 | |
| 182 | Condvar_impl::Condvar_impl() |
| 183 | { |
| 184 | } |
| 185 | |
| 186 | Condvar_impl::~Condvar_impl() |
| 187 | { |
| 188 | } |
| 189 | |
| 190 | void |
| 191 | Condvar_impl::wait(Lock_impl* li) |
| 192 | { |
| 193 | gold_assert(li->acquired_); |
| 194 | } |
| 195 | |
| 196 | void |
| 197 | Condvar_impl::signal() |
| 198 | { |
| 199 | } |
| 200 | |
| 201 | #endif // !defined(ENABLE_THREADS) |
| 202 | |
| 203 | // Methods for Condvar class. |
| 204 | |
| 205 | Condvar::Condvar(Lock& lock) |
| 206 | : lock_(lock) |
| 207 | { |
| 208 | this->condvar_ = new Condvar_impl; |
| 209 | } |
| 210 | |
| 211 | Condvar::~Condvar() |
| 212 | { |
| 213 | delete this->condvar_; |
| 214 | } |
| 215 | |
| 216 | void |
| 217 | Condvar::wait() |
| 218 | { |
| 219 | this->condvar_->wait(this->lock_.get_impl()); |
| 220 | } |
| 221 | |
| 222 | void |
| 223 | Condvar::signal() |
| 224 | { |
| 225 | this->condvar_->signal(); |
| 226 | } |
| 227 | |
| 228 | } // End namespace gold. |