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| Rev | Author | Line No. | Line |
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| 969 | runge | 1 | /*************************************************************************** |
| 2 | * Copyright (C) November 29, 2008 by Mattias Runge * |
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| 3 | * mattias@runge.se * |
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| 4 | * semaphore.h * |
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| 5 | * * |
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| 6 | * This program is free software; you can redistribute it and/or modify * |
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| 7 | * it under the terms of the GNU General Public License as published by * |
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| 8 | * the Free Software Foundation; either version 2 of the License, or * |
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| 9 | * (at your option) any later version. * |
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| 10 | * * |
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| 11 | * This program is distributed in the hope that it will be useful, * |
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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| 14 | * GNU General Public License for more details. * |
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| 15 | * * |
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| 16 | * You should have received a copy of the GNU General Public License * |
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| 17 | * along with this program; if not, write to the * |
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| 18 | * Free Software Foundation, Inc., * |
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| 19 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * |
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| 20 | ***************************************************************************/ |
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| 21 | |||
| 22 | #ifndef _SEMAPHORE_H |
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| 23 | #define _SEMAPHORE_H |
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| 24 | |||
| 25 | #include "mutex.h" |
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| 974 | runge | 26 | #include <sys/time.h> |
| 969 | runge | 27 | |
| 28 | class Semaphore : public Mutex |
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| 29 | { |
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| 30 | public: |
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| 31 | Semaphore() { pthread_cond_init(&myCondition, NULL); }; |
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| 32 | ~Semaphore() { pthread_cond_destroy(&myCondition); }; |
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| 33 | |||
| 34 | int broadcast() { return pthread_cond_broadcast(&myCondition); }; |
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| 35 | int wait() { return pthread_cond_wait(&myCondition, &myMutex); }; |
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| 974 | runge | 36 | int wait(int timeout) // Returns ETIMEDOUT on timeout |
| 37 | { |
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| 976 | runge | 38 | struct timeval timeval; |
| 969 | runge | 39 | |
| 976 | runge | 40 | gettimeofday(&timeval, NULL); |
| 41 | |||
| 974 | runge | 42 | /* Convert from timeval to timespec */ |
| 976 | runge | 43 | myTimespec.tv_sec = timeval.tv_sec; |
| 44 | myTimespec.tv_nsec = timeval.tv_usec * 1000; |
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| 974 | runge | 45 | myTimespec.tv_sec += timeout; |
| 46 | |||
| 47 | return pthread_cond_timedwait(&myCondition, &myMutex, &myTimespec); |
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| 48 | } |
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| 49 | |||
| 969 | runge | 50 | protected: |
| 51 | pthread_cond_t myCondition; |
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| 974 | runge | 52 | struct timespec myTimespec; |
| 976 | runge | 53 | |
| 969 | runge | 54 | }; |
| 55 | |||
| 56 | |||
| 57 | #endif /* _SEMAPHORE_H */ |
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| 58 |