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linux下是这样定义的：

在linux的实现中pthread_t被定义为 "unsigned long int",参考http://condor.depaul.edu/glancast/443class/docs/pthreads.html

Windows下这样定义：

/*  
 * Generic handle type - intended to extend uniqueness beyond  
 * that available with a simple pointer. It should scale for either  
 * IA-32 or IA-64.  
 */    
typedef struct {    
    void * p;                   /* Pointer to actual object */    
    unsigned int x;             /* Extra information - reuse count etc */    
} ptw32_handle_t;    
typedef ptw32_handle_t pthread_t;