blob: 4313f71db65f98ae61951b9862cdee56eeadc15b
| 1 | /* |
| 2 | reference android api, just linux pthread |
| 3 | */ |
| 4 | |
| 5 | #ifndef _TV_UTILS_CONDITION_H |
| 6 | #define _TV_UTILS_CONDITION_H |
| 7 | |
| 8 | #include <stdint.h> |
| 9 | #include <sys/types.h> |
| 10 | #include <time.h> |
| 11 | #include <pthread.h> |
| 12 | #include "CMutex.h" |
| 13 | |
| 14 | typedef long long nsecs_t; |
| 15 | |
| 16 | class CCondition |
| 17 | { |
| 18 | public: |
| 19 | enum { |
| 20 | PRIVATE = 0, |
| 21 | SHARED = 1 |
| 22 | }; |
| 23 | |
| 24 | CCondition(); |
| 25 | CCondition(int type); |
| 26 | ~CCondition(); |
| 27 | // Wait on the condition variable. Lock the mutex before calling. |
| 28 | int wait(CMutex &mutex); |
| 29 | // same with relative timeout |
| 30 | int waitRelative(CMutex &mutex, long sec); |
| 31 | // Signal the condition variable, allowing one thread to continue. |
| 32 | void signal(); |
| 33 | // Signal the condition variable, allowing all threads to continue. |
| 34 | void broadcast(); |
| 35 | |
| 36 | private: |
| 37 | pthread_cond_t mCond; |
| 38 | }; |
| 39 | |
| 40 | |
| 41 | |
| 42 | // --------------------------------------------------------------------------- |
| 43 | |
| 44 | inline CCondition::CCondition() |
| 45 | { |
| 46 | pthread_cond_init(&mCond, NULL); |
| 47 | } |
| 48 | inline CCondition::CCondition(int type) |
| 49 | { |
| 50 | if (type == SHARED) { |
| 51 | pthread_condattr_t attr; |
| 52 | pthread_condattr_init(&attr); |
| 53 | pthread_condattr_setpshared(&attr, PTHREAD_PROCESS_SHARED); |
| 54 | pthread_cond_init(&mCond, &attr); |
| 55 | pthread_condattr_destroy(&attr); |
| 56 | } else { |
| 57 | pthread_cond_init(&mCond, NULL); |
| 58 | } |
| 59 | } |
| 60 | inline CCondition::~CCondition() |
| 61 | { |
| 62 | pthread_cond_destroy(&mCond); |
| 63 | } |
| 64 | inline int CCondition::wait(CMutex &mutex) |
| 65 | { |
| 66 | return -pthread_cond_wait(&mCond, &mutex.mMutex); |
| 67 | } |
| 68 | inline int CCondition::waitRelative(CMutex &mutex, long msec) |
| 69 | { |
| 70 | struct timespec ts; |
| 71 | long _nanoSec = 1000000000; |
| 72 | int _sec = msec / 1000; |
| 73 | long _nsec = (msec - 1000 * _sec) * 1000000; |
| 74 | clock_gettime(CLOCK_REALTIME, &ts); |
| 75 | ts.tv_sec += _sec; |
| 76 | ts.tv_nsec += _nsec; |
| 77 | if (ts.tv_nsec > _nanoSec) { |
| 78 | ts.tv_nsec %= _nanoSec; |
| 79 | ts.tv_sec++; |
| 80 | } |
| 81 | return -pthread_cond_timedwait(&mCond, &mutex.mMutex, &ts); |
| 82 | } |
| 83 | inline void CCondition::signal() |
| 84 | { |
| 85 | pthread_cond_signal(&mCond); |
| 86 | } |
| 87 | inline void CCondition::broadcast() |
| 88 | { |
| 89 | pthread_cond_broadcast(&mCond); |
| 90 | } |
| 91 | #endif |
| 92 |