glibc之pthread_mutex_t/pthread_cond_t实现原理(十七)

1.pthread_mutex_t实现
glibc/sysdeps/nptl/bits/pthreadtypes.h
typedef union
{
  struct __pthread_mutex_s __data;
  char __size[__SIZEOF_PTHREAD_MUTEX_T];
  long int __align;
} pthread_mutex_t;

<2>.glibc/sysdeps/nptl/bits/thread-shared-types.h
struct __pthread_mutex_s
{
  int __lock __LOCK_ALIGNMENT;
  unsigned int __count;
  int __owner;
#if !__PTHREAD_MUTEX_NUSERS_AFTER_KIND
  unsigned int __nusers;
#endif
  int __kind;
  __PTHREAD_COMPAT_PADDING_MID
#if __PTHREAD_MUTEX_NUSERS_AFTER_KIND
  unsigned int __nusers;
#endif
#if !__PTHREAD_MUTEX_USE_UNION
  __PTHREAD_SPINS_DATA;
  __pthread_list_t __list;
# define __PTHREAD_MUTEX_HAVE_PREV      1
#else
  __extension__ union
  {
    __PTHREAD_SPINS_DATA;
    __pthread_slist_t __list;
  };
# define __PTHREAD_MUTEX_HAVE_PREV      0
#endif
  __PTHREAD_COMPAT_PADDING_END
};

struct __pthread_cond_s
{
  __extension__ union
  {
    __extension__ unsigned long long int __wseq;
    struct
    {
      unsigned int

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