1 | // |
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2 | // Semaphore_WIN32.cpp |
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3 | // |
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4 | // $Id: //poco/1.3/Foundation/src/Semaphore_WIN32.cpp#2 $ |
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5 | // |
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6 | // Library: Foundation |
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7 | // Package: Threading |
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8 | // Module: Semaphore |
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9 | // |
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10 | // Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH. |
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11 | // and Contributors. |
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12 | // |
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13 | // Permission is hereby granted, free of charge, to any person or organization |
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14 | // obtaining a copy of the software and accompanying documentation covered by |
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15 | // this license (the "Software") to use, reproduce, display, distribute, |
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16 | // execute, and transmit the Software, and to prepare derivative works of the |
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17 | // Software, and to permit third-parties to whom the Software is furnished to |
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18 | // do so, all subject to the following: |
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19 | // |
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20 | // The copyright notices in the Software and this entire statement, including |
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21 | // the above license grant, this restriction and the following disclaimer, |
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22 | // must be included in all copies of the Software, in whole or in part, and |
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23 | // all derivative works of the Software, unless such copies or derivative |
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24 | // works are solely in the form of machine-executable object code generated by |
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25 | // a source language processor. |
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26 | // |
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27 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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28 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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29 | // FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT |
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30 | // SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE |
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31 | // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, |
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32 | // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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33 | // DEALINGS IN THE SOFTWARE. |
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34 | // |
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35 | |
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36 | |
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37 | #include <Poco/Semaphore_WIN32.h> |
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38 | |
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39 | |
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40 | namespace Poco { |
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41 | |
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42 | |
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43 | SemaphoreImpl::SemaphoreImpl(int n, int max) |
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44 | { |
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45 | poco_assert (n >= 0 && max > 0 && n <= max); |
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46 | |
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47 | _sema = CreateSemaphoreW(NULL, n, max, NULL); |
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48 | if (!_sema) |
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49 | { |
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50 | throw SystemException("cannot create semaphore"); |
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51 | } |
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52 | } |
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53 | |
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54 | |
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55 | SemaphoreImpl::~SemaphoreImpl() |
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56 | { |
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57 | CloseHandle(_sema); |
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58 | } |
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59 | |
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60 | |
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61 | void SemaphoreImpl::waitImpl() |
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62 | { |
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63 | switch (WaitForSingleObject(_sema, INFINITE)) |
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64 | { |
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65 | case WAIT_OBJECT_0: |
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66 | return; |
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67 | default: |
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68 | throw SystemException("wait for semaphore failed"); |
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69 | } |
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70 | } |
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71 | |
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72 | |
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73 | bool SemaphoreImpl::waitImpl(long milliseconds) |
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74 | { |
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75 | switch (WaitForSingleObject(_sema, milliseconds + 1)) |
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76 | { |
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77 | case WAIT_TIMEOUT: |
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78 | return false; |
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79 | case WAIT_OBJECT_0: |
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80 | return true; |
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81 | default: |
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82 | throw SystemException("wait for semaphore failed"); |
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83 | } |
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84 | } |
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85 | |
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86 | |
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87 | } // namespace Poco |
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