并发编程

Once

设置只有第一次被调用时会执行的操作，man pthread_once()：

#include <pthread.h>

int pthread_once(pthread_once_t *once_control,  void (*init_routine)(void));

pthread_once_t once_control = PTHREAD_ONCE_INIT;

线程锁

线程读写锁

线程读写锁的创建初始化和销毁

创建初始化和销毁，man pthread_rwlock_init：

#include <pthread.h>

int pthread_rwlock_destroy(pthread_rwlock_t *rwlock);
int pthread_rwlock_init(pthread_rwlock_t *restrict rwlock, 
       const pthread_rwlockattr_t *restrict attr);

线程读写锁的加锁解锁操作

加读锁，man pthread_rwlock_rdlock：

#include <pthread.h>

int pthread_rwlock_rdlock(pthread_rwlock_t *rwlock);
int pthread_rwlock_tryrdlock(pthread_rwlock_t *rwlock);

加读锁等待超时，man pthread_rwlock_timedrdlock：

#include <pthread.h>
#include <time.h>

int pthread_rwlock_timedrdlock(pthread_rwlock_t *restrict rwlock,
       const struct timespec *restrict abs_timeout);

加写锁，man pthread_rwlock_wrlock：

#include <pthread.h>

int pthread_rwlock_trywrlock(pthread_rwlock_t *rwlock);
int pthread_rwlock_wrlock(pthread_rwlock_t *rwlock);

加写锁等待超时，man pthread_rwlock_timedwrlock：

#include <pthread.h>
#include <time.h>

int pthread_rwlock_timedwrlock(pthread_rwlock_t *restrict rwlock,
       const struct timespec *restrict abs_timeout);

解锁，man pthread_rwlock_unlock：

#include <pthread.h>

int pthread_rwlock_unlock(pthread_rwlock_t *rwlock);

线程互斥锁

线程互斥锁的创建初始化和销毁

创建初始化和销毁，man pthread_mutex_init：

#include <pthread.h>

int pthread_mutex_destroy(pthread_mutex_t *mutex);
int pthread_mutex_init(pthread_mutex_t *restrict mutex,
       const pthread_mutexattr_t *restrict attr);

pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;

线程互斥锁的加锁和解锁操作

加锁解锁，man pthread_mutex_lock：

#include <pthread.h>

int pthread_mutex_lock(pthread_mutex_t *mutex);
int pthread_mutex_trylock(pthread_mutex_t *mutex);

加锁等待超时，man pthread_mutex_timedlock：

#include <pthread.h>
#include <time.h>

int pthread_mutex_timedlock(pthread_mutex_t *restrict mutex,
       const struct timespec *restrict abs_timeout);

解锁操作，man pthread_mutex_unlock：

#include <pthread.h>

int pthread_mutex_unlock(pthread_mutex_t *mutex);