my_thread.h

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/* Copyright (c) 2000, 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 */
 
/**
  @file include/my_thread.h
  Defines to make different thread packages compatible.
*/
 
#ifndef MY_THREAD_INCLUDED
#define MY_THREAD_INCLUDED
 
#include <errno.h>
#include <stdbool.h>
#include <stddef.h>
 
#include <mysql/components/services/bits/my_thread_bits.h>
 
#include "my_compiler.h"
#include "my_config.h"
#include "my_inttypes.h"
#include "my_macros.h"
 
#ifndef ETIME
#define ETIME ETIMEDOUT /* For FreeBSD */
#endif
 
#ifndef ETIMEDOUT
#define ETIMEDOUT 145 /* Win32 doesn't have this */
#endif
 
// Pick a value which is enough for all mtr tests,
// on all known/supported platforms.
// Currently the largest stack requirement is with
// clang with DEBUG and UBSAN -O0 -fno-inline
#define DEFAULT_THREAD_STACK (1024UL * 1024UL)
 
static inline int is_timeout(int e) {
#if ETIMEDOUT == ETIME
  return e == ETIMEDOUT;
#else
  return e == ETIMEDOUT || e == ETIME;
#endif
}
 
#ifdef _WIN32
#define MY_THREAD_CREATE_JOINABLE 0
#define MY_THREAD_CREATE_DETACHED 1
typedef void *(__cdecl *my_start_routine)(void *);
#else
#define MY_THREAD_CREATE_JOINABLE PTHREAD_CREATE_JOINABLE
#define MY_THREAD_CREATE_DETACHED PTHREAD_CREATE_DETACHED
typedef void *(*my_start_routine)(void *);
#endif
 
static inline my_thread_t my_thread_self() {
#ifdef _WIN32
  return GetCurrentThreadId();
#else
  return pthread_self();
#endif
}
 
static inline int my_thread_equal(my_thread_t t1, my_thread_t t2) {
#ifdef _WIN32
  return t1 == t2;
#else
  return pthread_equal(t1, t2);
#endif
}
 
static inline int my_thread_attr_init(my_thread_attr_t *attr) {
#ifdef _WIN32
  attr->dwStackSize = 0;
  /* Set to joinable by default to match Linux */
  attr->detachstate = MY_THREAD_CREATE_JOINABLE;
  return 0;
#else
  return pthread_attr_init(attr);
#endif
}
 
static inline int my_thread_attr_destroy(my_thread_attr_t *attr) {
#ifdef _WIN32
  attr->dwStackSize = 0;
  /* Set to joinable by default to match Linux */
  attr->detachstate = MY_THREAD_CREATE_JOINABLE;
  return 0;
#else
  return pthread_attr_destroy(attr);
#endif
}
 
static inline int my_thread_attr_setstacksize(my_thread_attr_t *attr,
                                              size_t stacksize) {
#ifdef _WIN32
  attr->dwStackSize = (DWORD)stacksize;
  return 0;
#else
  return pthread_attr_setstacksize(attr, stacksize);
#endif
}
 
static inline int my_thread_attr_setdetachstate(my_thread_attr_t *attr,
                                                int detachstate) {
#ifdef _WIN32
  attr->detachstate = detachstate;
  return 0;
#else
  return pthread_attr_setdetachstate(attr, detachstate);
#endif
}
 
static inline int my_thread_attr_getstacksize(my_thread_attr_t *attr,
                                              size_t *stacksize) {
#ifdef _WIN32
  *stacksize = (size_t)attr->dwStackSize;
  return 0;
#else
  return pthread_attr_getstacksize(attr, stacksize);
#endif
}
 
static inline void my_thread_yield() {
#ifdef _WIN32
  SwitchToThread();
#else
  sched_yield();
#endif
}
 
inline bool operator==(const my_thread_handle &a, const my_thread_handle &b) {
  return (a.thread == b.thread
#ifdef WIN32
          && a.handle == b.handle
#endif /* WIN32 */
  );
}
inline bool operator!=(const my_thread_handle &a, const my_thread_handle &b) {
  return !(a == b);
}
 
int my_thread_create(my_thread_handle *thread, const my_thread_attr_t *attr,
                     my_start_routine func, void *arg);
int my_thread_join(my_thread_handle *thread, void **value_ptr);
int my_thread_cancel(my_thread_handle *thread);
void my_thread_exit(void *value_ptr) MY_ATTRIBUTE((noreturn));
 
/** Sets the name of the thread for system and debugger, if possible.
@param name Name to set, must be shorter than SETNAME_MAX_LENGTH, including NULL
character. */
void my_thread_self_setname(const char *name);
 
extern bool my_thread_global_init();
extern void my_thread_global_reinit();
extern void my_thread_global_end();
 
// Need to be extern "C" for the time being, due to memcached.
extern "C" bool my_thread_init();
extern "C" void my_thread_end();
 
#endif /* MY_THREAD_INCLUDED */