| 284 | |
| 285 | |
| 286 | bool Semaphore::tryWait() |
| 287 | { |
| 288 | #ifdef _WIN32 |
| 289 | |
| 290 | DWORD err = WaitForSingleObject(sem, 0); |
| 291 | if(err == WAIT_FAILED) throw(W32Error("Semaphore::tryWait()")); |
| 292 | else if(err == WAIT_TIMEOUT) return false; |
| 293 | |
| 294 | #elif defined(__APPLE__) |
| 295 | |
| 296 | int err = 0; |
| 297 | do |
| 298 | { |
| 299 | err = sem_trywait(sem); |
| 300 | } while(err < 0 && errno == EINTR); |
| 301 | if(err < 0) |
| 302 | { |
| 303 | if(errno == EAGAIN) return false; |
| 304 | else throw(UnixError("Semaphore::tryWait()")); |
| 305 | } |
| 306 | |
| 307 | #else |
| 308 | |
| 309 | int err = 0; |
| 310 | do |
| 311 | { |
| 312 | err = sem_trywait(&sem); |
| 313 | } while(err < 0 && errno == EINTR); |
| 314 | if(err < 0) |
| 315 | { |
| 316 | if(errno == EAGAIN) return false; |
| 317 | else throw(UnixError("Semaphore::tryWait()")); |
| 318 | } |
| 319 | |
| 320 | #endif |
| 321 | |
| 322 | return true; |
| 323 | } |
| 324 | |
| 325 | |
| 326 | void Semaphore::post(void) |