/* Copyright (c) 2015, 2021, Oracle and/or its affiliates.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License, version 2.0, for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */

#ifndef MY_XP_THREAD_INCLUDED
#define MY_XP_THREAD_INCLUDED

#include <xplatform/my_xp_cond.h>

#ifndef ETIME
#define ETIME ETIMEDOUT                         /* For FreeBSD */
#endif

#ifndef ETIMEDOUT
#define ETIMEDOUT 145                           /* Win32 doesn't have this */
#endif

typedef unsigned int uint32;
typedef uint32 native_thread_id;

#ifdef _WIN32

typedef volatile LONG    native_thread_once_t;
typedef DWORD            native_thread_t;
typedef struct thread_attr
{
  DWORD dwStackSize;
} native_thread_attr_t;
typedef void *(__cdecl *native_start_routine)(void *);
#define MY_THREAD_ONCE_INIT       0
#define MY_THREAD_ONCE_INPROGRESS 1
#define MY_THREAD_ONCE_DONE       2

#include <process.h>
#include <signal.h>

struct thread_start_parameter
{
  native_start_routine func;
  void *arg;
};


static unsigned int __stdcall win_thread_start(void *p)
{
  struct thread_start_parameter *par= (struct thread_start_parameter *)p;
  native_start_routine func=          par->func;
  void *arg=                          par->arg;

  free(p);
  (*func)(arg);
  return 0;
}


/* All thread specific variables are in the following struct */
struct st_native_thread_var
{
  int thr_errno;
  /*
    thr_winerr is used for returning the original OS error-code in Windows,
    my_osmaperr() returns EINVAL for all unknown Windows errors, hence we
    preserve the original Windows Error code in thr_winerr.
  */
  int thr_winerr;
  native_cond_t suspend;
  native_thread_id id;
  int volatile abort;
  struct st_native_thread_var *next, **prev;
  void *opt_info;
#ifndef NDEBUG
  void *dbug;
#endif
};


int set_mysys_thread_var(struct st_native_thread_var *mysys_var);

#ifndef NDEBUG
/**
  Returns pointer to DBUG for holding current state.
*/
void **my_thread_var_dbug();
#endif

#define my_errno mysys_thread_var()->thr_errno

struct errentry
{
  unsigned long oscode;                         /* OS return value */
  int sysv_errno;                               /* System V error code */
};

static struct errentry errtable[]= {
  {  ERROR_INVALID_FUNCTION,       EINVAL    },  /* 1 */
  {  ERROR_FILE_NOT_FOUND,         ENOENT    },  /* 2 */
  {  ERROR_PATH_NOT_FOUND,         ENOENT    },  /* 3 */
  {  ERROR_TOO_MANY_OPEN_FILES,    EMFILE    },  /* 4 */
  {  ERROR_ACCESS_DENIED,          EACCES    },  /* 5 */
  {  ERROR_INVALID_HANDLE,         EBADF     },  /* 6 */
  {  ERROR_ARENA_TRASHED,          ENOMEM    },  /* 7 */
  {  ERROR_NOT_ENOUGH_MEMORY,      ENOMEM    },  /* 8 */
  {  ERROR_INVALID_BLOCK,          ENOMEM    },  /* 9 */
  {  ERROR_BAD_ENVIRONMENT,        E2BIG     },  /* 10 */
  {  ERROR_BAD_FORMAT,             ENOEXEC   },  /* 11 */
  {  ERROR_INVALID_ACCESS,         EINVAL    },  /* 12 */
  {  ERROR_INVALID_DATA,           EINVAL    },  /* 13 */
  {  ERROR_INVALID_DRIVE,          ENOENT    },  /* 15 */
  {  ERROR_CURRENT_DIRECTORY,      EACCES    },  /* 16 */
  {  ERROR_NOT_SAME_DEVICE,        EXDEV     },  /* 17 */
  {  ERROR_NO_MORE_FILES,          ENOENT    },  /* 18 */
  {  ERROR_LOCK_VIOLATION,         EACCES    },  /* 33 */
  {  ERROR_BAD_NETPATH,            ENOENT    },  /* 53 */
  {  ERROR_NETWORK_ACCESS_DENIED,  EACCES    },  /* 65 */
  {  ERROR_BAD_NET_NAME,           ENOENT    },  /* 67 */
  {  ERROR_FILE_EXISTS,            EEXIST    },  /* 80 */
  {  ERROR_CANNOT_MAKE,            EACCES    },  /* 82 */
  {  ERROR_FAIL_I24,               EACCES    },  /* 83 */
  {  ERROR_INVALID_PARAMETER,      EINVAL    },  /* 87 */
  {  ERROR_NO_PROC_SLOTS,          EAGAIN    },  /* 89 */
  {  ERROR_DRIVE_LOCKED,           EACCES    },  /* 108 */
  {  ERROR_BROKEN_PIPE,            EPIPE     },  /* 109 */
  {  ERROR_DISK_FULL,              ENOSPC    },  /* 112 */
  {  ERROR_INVALID_TARGET_HANDLE,  EBADF     },  /* 114 */
  {  ERROR_INVALID_NAME,           ENOENT    },  /* 123 */
  {  ERROR_INVALID_HANDLE,         EINVAL    },  /* 124 */
  {  ERROR_WAIT_NO_CHILDREN,       ECHILD    },  /* 128 */
  {  ERROR_CHILD_NOT_COMPLETE,     ECHILD    },  /* 129 */
  {  ERROR_DIRECT_ACCESS_HANDLE,   EBADF     },  /* 130 */
  {  ERROR_NEGATIVE_SEEK,          EINVAL    },  /* 131 */
  {  ERROR_SEEK_ON_DEVICE,         EACCES    },  /* 132 */
  {  ERROR_DIR_NOT_EMPTY,          ENOTEMPTY },  /* 145 */
  {  ERROR_NOT_LOCKED,             EACCES    },  /* 158 */
  {  ERROR_BAD_PATHNAME,           ENOENT    },  /* 161 */
  {  ERROR_MAX_THRDS_REACHED,      EAGAIN    },  /* 164 */
  {  ERROR_LOCK_FAILED,            EACCES    },  /* 167 */
  {  ERROR_ALREADY_EXISTS,         EEXIST    },  /* 183 */
  {  ERROR_FILENAME_EXCED_RANGE,   ENOENT    },  /* 206 */
  {  ERROR_NESTING_NOT_ALLOWED,    EAGAIN    },  /* 215 */
  {  ERROR_NOT_ENOUGH_QUOTA,       ENOMEM    }    /* 1816 */
};

/* size of the table */
#define ERRTABLESIZE (sizeof(errtable)/sizeof(errtable[0]))

/*
  The following two constants must be the minimum and maximum
  values in the (contiguous) range of Exec Failure errors.
*/
#define MIN_EXEC_ERROR ERROR_INVALID_STARTING_CODESEG
#define MAX_EXEC_ERROR ERROR_INFLOOP_IN_RELOC_CHAIN

/*
  These are the low and high value in the range of errors that are access
  violations.
*/
#define MIN_EACCES_RANGE ERROR_WRITE_PROTECT
#define MAX_EACCES_RANGE ERROR_SHARING_BUFFER_EXCEEDED


static int get_errno_from_oserr(unsigned long oserrno)
{
  int i;

  /* check the table for the OS error code */
  for (i= 0; i < ERRTABLESIZE; ++i)
  {
    if (oserrno == errtable[i].oscode)
    {
      return  errtable[i].sysv_errno;
    }
  }

  /*
    The error code wasn't in the table.  We check for a range of
    EACCES errors or exec failure errors (ENOEXEC).  Otherwise
    EINVAL is returned.
  */

  if (oserrno >= MIN_EACCES_RANGE && oserrno <= MAX_EACCES_RANGE)
    return EACCES;
  else if (oserrno >= MIN_EXEC_ERROR && oserrno <= MAX_EXEC_ERROR)
    return ENOEXEC;
  else
    return EINVAL;
}

#else
#include <pthread.h>

typedef pthread_once_t   native_thread_once_t;
typedef pthread_t        native_thread_t;
typedef pthread_attr_t   native_thread_attr_t;
typedef void *(*native_start_routine)(void *);
#define MY_THREAD_ONCE_INIT       PTHREAD_ONCE_INIT
#endif

/**
  @class My_xp_thread

  Abstract class used to wrap mutex for various platforms.

  A typical use case is:

  @code{.cpp}

  My_xp_thread thread= My_xp_thread::get_thread();
  thread->create(NULL, &function, &args);

  void *result;
  thread->join(&result);

  @endcode
*/
class My_xp_thread
{
public:
  /**
    Creates thread.

    @param thread attributes
    @param routine function
    @param function parameters
    @return success status
  */

  virtual int create(const native_thread_attr_t *attr,
                     native_start_routine func, void *arg)= 0;


  /**
    One time initialization.

    @param init routine to invoke
    @return success status
  */

  virtual int once(void (*init_routine)(void))= 0;


  /**
    Suspend invoking thread until this thread terminates.

    @param pointer for a placeholder for the terminating thread status
    @return success status
  */

  virtual int join(void **value_ptr)= 0;


  /**
    Cancel this thread.

    @return success status
  */

  virtual int cancel()= 0;


  /**
    Detach this thread, i.e. its resources can be reclaimed when it terminates.

    @return success status
  */

  virtual int detach()= 0;


  /**
    Retrieves native thread reference

    @return native thread pointer
  */

  virtual native_thread_t *get_native_thread()= 0;

  virtual ~My_xp_thread() {}
};

#ifdef _WIN32
class My_xp_thread_win : public My_xp_thread
{
private:
  HANDLE m_handle;
  void my_osmaperr( unsigned long oserrno);
  st_native_thread_var *m_thread_var;
  /*
    Disabling the copy constructor and assignment operator.
  */
  My_xp_thread_win(My_xp_thread_win const&);
  My_xp_thread_win& operator=(My_xp_thread_win const&);
public:
  explicit My_xp_thread_win();
  virtual ~My_xp_thread_win();
#else
class My_xp_thread_pthread : public My_xp_thread
{
private:
  /*
    Disabling the copy constructor and assignment operator.
  */
  My_xp_thread_pthread(My_xp_thread_pthread const&);
  My_xp_thread_pthread& operator=(My_xp_thread_pthread const&);
public:
  explicit My_xp_thread_pthread();
  virtual ~My_xp_thread_pthread();
#endif
  int create(const native_thread_attr_t *attr, native_start_routine func,
             void *arg);
  int once(void (*init_routine)(void));
  int join(void **value_ptr);
  int cancel();
  int detach();
  native_thread_t *get_native_thread();

protected:
  native_thread_t *m_thread;
  native_thread_once_t *m_thread_once;
};

#ifdef _WIN32
class My_xp_thread_impl : public My_xp_thread_win
#else
class My_xp_thread_impl : public My_xp_thread_pthread
#endif
{
public:
  explicit My_xp_thread_impl() {}
  ~My_xp_thread_impl() {}
};

class My_xp_thread_util
{
public:
  /**
    Terminate invoking thread.

    @param thread exit value pointer
  */

  static void exit(void *value_ptr);


  /**
    Initialize thread attributes object.

    @param thread attributes
    @return success status
  */

  static int attr_init(native_thread_attr_t *attr);


  /**
    Destroy thread attributes object.

    @param thread attributes
    @return success status
  */

  static int attr_destroy(native_thread_attr_t *attr);


  /**
    Retrieve current thread id.

    @return current thread id
  */

  static native_thread_t self();
};

#endif // MY_XP_THREAD_INCLUDED
