thr_mutex_bits.h

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/* Copyright (c) 2014, 2022, Oracle and/or its affiliates.
 
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   it under the terms of the GNU General Public License, version 2.0,
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#ifndef COMPONENTS_SERVICES_BITS_THR_MUTEX_BITS_H
#define COMPONENTS_SERVICES_BITS_THR_MUTEX_BITS_H
 
#if defined(_WIN32)
#include <windows.h>
#else
#include <pthread.h>  // IWYU pragma: export
#include <sched.h>    // IWYU pragma: export
#endif
 
/**
  @file mysql/components/services/bits/thr_mutex_bits.h
  ABI for thd_mutex
 
  There are three "layers":
  1) native_mutex_*()
       Functions that map directly down to OS primitives.
       Windows    - CriticalSection
       Other OSes - pthread
  2) my_mutex_*()
       Functions that implement SAFE_MUTEX (default for debug),
       Otherwise native_mutex_*() is used.
  3) mysql_mutex_*()
       Functions that include Performance Schema instrumentation.
       See include/mysql/psi/mysql_thread.h
*/
 
#ifdef _WIN32
typedef CRITICAL_SECTION native_mutex_t;
typedef int native_mutexattr_t;
#else
typedef pthread_mutex_t native_mutex_t;
typedef pthread_mutexattr_t native_mutexattr_t;
#endif
 
struct safe_mutex_t;
 
struct my_mutex_t {
  union u {
    native_mutex_t m_native;
    safe_mutex_t *m_safe_ptr;
  } m_u;
};
typedef struct my_mutex_t my_mutex_t;
 
#endif /* COMPONENTS_SERVICES_BITS_THR_MUTEX_BITS_H */