#include <pthread.h>
引用的是unix下支持的锁的形式。静态互斥体结构体定义如下 //递归式互斥量基本体 struct sqlite3_mutex { pthread_mutex_t mutex; / Mutex controlling the lock /
#if SQLITE_MUTEX_NREF
int id; /* Mutex type */
volatile int nRef; /* Number of entrances */
volatile pthread_t owner; /* Thread that is within this mutex */
int trace; /* True to trace changes */
#endif
};