| 1 | #pragma once |
| 2 | /* |
| 3 | * This file is part of the libCEC(R) library. |
| 4 | * |
| 5 | * libCEC(R) is Copyright (C) 2011-2013 Pulse-Eight Limited. All rights reserved. |
| 6 | * libCEC(R) is an original work, containing original code. |
| 7 | * |
| 8 | * libCEC(R) is a trademark of Pulse-Eight Limited. |
| 9 | * |
| 10 | * This program is dual-licensed; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to the Free Software |
| 22 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 23 | * |
| 24 | * |
| 25 | * Alternatively, you can license this library under a commercial license, |
| 26 | * please contact Pulse-Eight Licensing for more information. |
| 27 | * |
| 28 | * For more information contact: |
| 29 | * Pulse-Eight Licensing <license@pulse-eight.com> |
| 30 | * http://www.pulse-eight.com/ |
| 31 | * http://www.pulse-eight.net/ |
| 32 | */ |
| 33 | |
| 34 | #include "lib/platform/os.h" |
| 35 | |
| 36 | #if defined(__WINDOWS__) |
| 37 | #include "lib/platform/windows/os-threads.h" |
| 38 | #else |
| 39 | #include "lib/platform/posix/os-threads.h" |
| 40 | #endif |
| 41 | |
| 42 | #include "lib/platform/util/timeutils.h" |
| 43 | |
| 44 | namespace PLATFORM |
| 45 | { |
| 46 | class PreventCopy |
| 47 | { |
| 48 | public: |
| 49 | inline PreventCopy(void) {} |
| 50 | inline ~PreventCopy(void) {} |
| 51 | |
| 52 | private: |
| 53 | inline PreventCopy(const PreventCopy &c) { *this = c; } |
| 54 | inline PreventCopy &operator=(const PreventCopy & UNUSED(c)){ return *this; } |
| 55 | }; |
| 56 | |
| 57 | template <typename _Predicate> |
| 58 | class CCondition; |
| 59 | |
| 60 | class CMutex : public PreventCopy |
| 61 | { |
| 62 | template <typename _Predicate> |
| 63 | friend class CCondition; |
| 64 | public: |
| 65 | inline CMutex(void) : |
| 66 | m_iLockCount(0) |
| 67 | { |
| 68 | MutexCreate(m_mutex); |
| 69 | } |
| 70 | |
| 71 | inline ~CMutex(void) |
| 72 | { |
| 73 | Clear(); |
| 74 | MutexDelete(m_mutex); |
| 75 | } |
| 76 | |
| 77 | inline bool TryLock(void) |
| 78 | { |
| 79 | if (MutexTryLock(m_mutex)) |
| 80 | { |
| 81 | ++m_iLockCount; |
| 82 | return true; |
| 83 | } |
| 84 | return false; |
| 85 | } |
| 86 | |
| 87 | inline bool Lock(void) |
| 88 | { |
| 89 | if (MutexLock(m_mutex)) |
| 90 | { |
| 91 | ++m_iLockCount; |
| 92 | return true; |
| 93 | } |
| 94 | return false; |
| 95 | } |
| 96 | |
| 97 | inline void Unlock(void) |
| 98 | { |
| 99 | if (Lock()) |
| 100 | { |
| 101 | if (m_iLockCount >= 2) |
| 102 | { |
| 103 | --m_iLockCount; |
| 104 | MutexUnlock(m_mutex); |
| 105 | } |
| 106 | |
| 107 | --m_iLockCount; |
| 108 | MutexUnlock(m_mutex); |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | inline bool Clear(void) |
| 113 | { |
| 114 | bool bReturn(false); |
| 115 | if (TryLock()) |
| 116 | { |
| 117 | unsigned int iLockCount = m_iLockCount; |
| 118 | for (unsigned int iPtr = 0; iPtr < iLockCount; iPtr++) |
| 119 | Unlock(); |
| 120 | bReturn = true; |
| 121 | } |
| 122 | return bReturn; |
| 123 | } |
| 124 | |
| 125 | private: |
| 126 | mutex_t m_mutex; |
| 127 | volatile unsigned int m_iLockCount; |
| 128 | }; |
| 129 | |
| 130 | class CLockObject : public PreventCopy |
| 131 | { |
| 132 | public: |
| 133 | inline CLockObject(CMutex &mutex, bool bClearOnExit = false) : |
| 134 | m_mutex(mutex), |
| 135 | m_bClearOnExit(bClearOnExit) |
| 136 | { |
| 137 | m_mutex.Lock(); |
| 138 | } |
| 139 | |
| 140 | inline ~CLockObject(void) |
| 141 | { |
| 142 | if (m_bClearOnExit) |
| 143 | Clear(); |
| 144 | else |
| 145 | Unlock(); |
| 146 | } |
| 147 | |
| 148 | inline bool TryLock(void) |
| 149 | { |
| 150 | return m_mutex.TryLock(); |
| 151 | } |
| 152 | |
| 153 | inline void Unlock(void) |
| 154 | { |
| 155 | m_mutex.Unlock(); |
| 156 | } |
| 157 | |
| 158 | inline bool Clear(void) |
| 159 | { |
| 160 | return m_mutex.Clear(); |
| 161 | } |
| 162 | |
| 163 | inline bool Lock(void) |
| 164 | { |
| 165 | return m_mutex.Lock(); |
| 166 | } |
| 167 | |
| 168 | private: |
| 169 | CMutex &m_mutex; |
| 170 | bool m_bClearOnExit; |
| 171 | }; |
| 172 | |
| 173 | class CTryLockObject : public PreventCopy |
| 174 | { |
| 175 | public: |
| 176 | inline CTryLockObject(CMutex &mutex, bool bClearOnExit = false) : |
| 177 | m_mutex(mutex), |
| 178 | m_bClearOnExit(bClearOnExit), |
| 179 | m_bIsLocked(m_mutex.TryLock()) |
| 180 | { |
| 181 | } |
| 182 | |
| 183 | inline ~CTryLockObject(void) |
| 184 | { |
| 185 | if (m_bClearOnExit) |
| 186 | Clear(); |
| 187 | else if (m_bIsLocked) |
| 188 | Unlock(); |
| 189 | } |
| 190 | |
| 191 | inline bool TryLock(void) |
| 192 | { |
| 193 | bool bReturn = m_mutex.TryLock(); |
| 194 | m_bIsLocked |= bReturn; |
| 195 | return bReturn; |
| 196 | } |
| 197 | |
| 198 | inline void Unlock(void) |
| 199 | { |
| 200 | if (m_bIsLocked) |
| 201 | { |
| 202 | m_bIsLocked = false; |
| 203 | m_mutex.Unlock(); |
| 204 | } |
| 205 | } |
| 206 | |
| 207 | inline bool Clear(void) |
| 208 | { |
| 209 | m_bIsLocked = false; |
| 210 | return m_mutex.Clear(); |
| 211 | } |
| 212 | |
| 213 | inline bool Lock(void) |
| 214 | { |
| 215 | bool bReturn = m_mutex.Lock(); |
| 216 | m_bIsLocked |= bReturn; |
| 217 | return bReturn; |
| 218 | } |
| 219 | |
| 220 | inline bool IsLocked(void) const |
| 221 | { |
| 222 | return m_bIsLocked; |
| 223 | } |
| 224 | |
| 225 | private: |
| 226 | CMutex & m_mutex; |
| 227 | bool m_bClearOnExit; |
| 228 | volatile bool m_bIsLocked; |
| 229 | }; |
| 230 | |
| 231 | template <typename _Predicate> |
| 232 | class CCondition : public PreventCopy |
| 233 | { |
| 234 | public: |
| 235 | inline CCondition(void) {} |
| 236 | inline ~CCondition(void) |
| 237 | { |
| 238 | m_condition.Broadcast(); |
| 239 | } |
| 240 | |
| 241 | inline void Broadcast(void) |
| 242 | { |
| 243 | m_condition.Broadcast(); |
| 244 | } |
| 245 | |
| 246 | inline void Signal(void) |
| 247 | { |
| 248 | m_condition.Signal(); |
| 249 | } |
| 250 | |
| 251 | inline bool Wait(CMutex &mutex, _Predicate &predicate) |
| 252 | { |
| 253 | while(!predicate) |
| 254 | m_condition.Wait(mutex.m_mutex); |
| 255 | return true; |
| 256 | } |
| 257 | |
| 258 | inline bool Wait(CMutex &mutex, _Predicate &predicate, uint32_t iTimeout) |
| 259 | { |
| 260 | if (iTimeout == 0) |
| 261 | return Wait(mutex, predicate); |
| 262 | |
| 263 | if (predicate) |
| 264 | return true; |
| 265 | |
| 266 | bool bReturn(false); |
| 267 | bool bBreak(false); |
| 268 | CTimeout timeout(iTimeout); |
| 269 | uint32_t iMsLeft(0); |
| 270 | |
| 271 | while (!bReturn && !bBreak) |
| 272 | { |
| 273 | iMsLeft = timeout.TimeLeft(); |
| 274 | if ((bReturn = predicate) == false && (bBreak = iMsLeft == 0) == false) |
| 275 | m_condition.Wait(mutex.m_mutex, iMsLeft); |
| 276 | } |
| 277 | return bReturn; |
| 278 | } |
| 279 | |
| 280 | private: |
| 281 | CConditionImpl m_condition; |
| 282 | }; |
| 283 | |
| 284 | class CEvent |
| 285 | { |
| 286 | public: |
| 287 | CEvent(bool bAutoReset = true) : |
| 288 | m_bSignaled(false), |
| 289 | m_bBroadcast(false), |
| 290 | m_iWaitingThreads(0), |
| 291 | m_bAutoReset(bAutoReset) {} |
| 292 | virtual ~CEvent(void) {} |
| 293 | |
| 294 | void Broadcast(void) |
| 295 | { |
| 296 | Set(true); |
| 297 | m_condition.Broadcast(); |
| 298 | } |
| 299 | |
| 300 | void Signal(void) |
| 301 | { |
| 302 | Set(false); |
| 303 | m_condition.Signal(); |
| 304 | } |
| 305 | |
| 306 | bool Wait(void) |
| 307 | { |
| 308 | CLockObject lock(m_mutex); |
| 309 | ++m_iWaitingThreads; |
| 310 | |
| 311 | bool bReturn = m_condition.Wait(m_mutex, m_bSignaled); |
| 312 | return ResetAndReturn() && bReturn; |
| 313 | } |
| 314 | |
| 315 | bool Wait(uint32_t iTimeout) |
| 316 | { |
| 317 | if (iTimeout == 0) |
| 318 | return Wait(); |
| 319 | |
| 320 | CLockObject lock(m_mutex); |
| 321 | ++m_iWaitingThreads; |
| 322 | bool bReturn = m_condition.Wait(m_mutex, m_bSignaled, iTimeout); |
| 323 | return ResetAndReturn() && bReturn; |
| 324 | } |
| 325 | |
| 326 | static void Sleep(uint32_t iTimeout) |
| 327 | { |
| 328 | CEvent event; |
| 329 | event.Wait(iTimeout); |
| 330 | } |
| 331 | |
| 332 | private: |
| 333 | void Set(bool bBroadcast = false) |
| 334 | { |
| 335 | CLockObject lock(m_mutex); |
| 336 | m_bSignaled = true; |
| 337 | m_bBroadcast = bBroadcast; |
| 338 | } |
| 339 | |
| 340 | bool ResetAndReturn(void) |
| 341 | { |
| 342 | CLockObject lock(m_mutex); |
| 343 | bool bReturn(m_bSignaled); |
| 344 | if (bReturn && (--m_iWaitingThreads == 0 || !m_bBroadcast) && m_bAutoReset) |
| 345 | m_bSignaled = false; |
| 346 | return bReturn; |
| 347 | } |
| 348 | |
| 349 | volatile bool m_bSignaled; |
| 350 | CCondition<volatile bool> m_condition; |
| 351 | CMutex m_mutex; |
| 352 | volatile bool m_bBroadcast; |
| 353 | unsigned int m_iWaitingThreads; |
| 354 | bool m_bAutoReset; |
| 355 | }; |
| 356 | } |