Thread Synchronization
Condition Variables - produce true suspended wait
- 3 parts: variable, mutex, and predicate
Atrributes, Initialization, and Destruction (PC == pthread_cond below)
- int pthread_condattr_init(pthread_condattr_t * attr);
- int pthread_condattr_destroy(pthread_condattr_t * attr);
- int pthread_cond_init(pthread_cond *cond, PCattr_t *attr);
- int pthread_cond_destroy(PC_t *cond, PCattr_t*attr);
- pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
Waiting on a condition
- Mutex must be acquired first (PM_T == pthread_mutex below)
- int pthread_cond_wait(PC_t *cond, pthread_mutex_t *mutex);
- int PC_timedwait(PC_t *cond, PM_t *mutex, struct timespec *abstime)
- wait() does the following implicitly:
- Unlock mutex, block, get signal, lock mutex, return
- Application should explicitly check predicate after returning from wait()
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