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/*
This file is part of libmicrohttpd
Copyright (C) 2016 Karlson2k (Evgeny Grin)
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file microhttpd/mhd_threads.h
* @brief Header for platform-independent threads abstraction
* @author Karlson2k (Evgeny Grin)
*
* Provides basic abstraction for threads.
* Any functions can be implemented as macro on some platforms
* unless explicitly marked otherwise.
* Any function argument can be skipped in macro, so avoid
* variable modification in function parameters.
*
* @warning Unlike pthread functions, most of functions return
* nonzero on success.
*/
#ifndef MHD_THREADS_H
#define MHD_THREADS_H 1
#include "mhd_options.h"
#ifdef HAVE_STDDEF_H
# include <stddef.h> /* for size_t */
#else /* ! HAVE_STDDEF_H */
# include <stdlib.h> /* for size_t */
#endif /* ! HAVE_STDDEF_H */
#if defined(MHD_USE_POSIX_THREADS)
# undef HAVE_CONFIG_H
# include <pthread.h>
# define HAVE_CONFIG_H 1
#elif defined(MHD_USE_W32_THREADS)
# ifndef WIN32_LEAN_AND_MEAN
# define WIN32_LEAN_AND_MEAN 1
# endif /* !WIN32_LEAN_AND_MEAN */
# include <windows.h>
#else
# error No threading API is available.
#endif
#ifndef MHD_NO_THREAD_NAMES
# if defined(MHD_USE_POSIX_THREADS)
# if defined(HAVE_PTHREAD_SETNAME_NP_GNU) || \
defined(HAVE_PTHREAD_SET_NAME_NP_FREEBSD) || \
defined(HAVE_PTHREAD_SETNAME_NP_DARWIN) || \
defined(HAVE_PTHREAD_SETNAME_NP_NETBSD) || \
defined(HAVE_PTHREAD_ATTR_SETNAME_NP_NETBSD) || \
defined(HAVE_PTHREAD_ATTR_SETNAME_NP_IBMI)
# define MHD_USE_THREAD_NAME_
# endif /* HAVE_PTHREAD_SETNAME_NP */
# elif defined(MHD_USE_W32_THREADS)
# ifdef _MSC_FULL_VER
/* Thread names only available with VC compiler */
# define MHD_USE_THREAD_NAME_
# endif /* _MSC_FULL_VER */
# endif
#endif
#if defined(MHD_USE_POSIX_THREADS)
typedef pthread_t MHD_thread_handle_;
#elif defined(MHD_USE_W32_THREADS)
typedef HANDLE MHD_thread_handle_;
#endif
#if defined(MHD_USE_POSIX_THREADS)
# define MHD_THRD_RTRN_TYPE_ void*
# define MHD_THRD_CALL_SPEC_
#elif defined(MHD_USE_W32_THREADS)
# define MHD_THRD_RTRN_TYPE_ unsigned
# define MHD_THRD_CALL_SPEC_ __stdcall
#endif
#if defined(MHD_USE_POSIX_THREADS)
typedef pthread_t MHD_thread_ID_;
#elif defined(MHD_USE_W32_THREADS)
typedef DWORD MHD_thread_ID_;
#endif
/* Depending on implementation, pthread_create() MAY set thread ID into
* provided pointer and after it start thread OR start thread and after
* it set thread ID. In the latter case, to avoid data races, additional
* pthread_self() call is required in thread routine. If some platform
* is known for setting thread ID BEFORE starting thread macro
* MHD_PTHREAD_CREATE__SET_ID_BEFORE_START_THREAD could be defined
* to save some resources. */
/* * handle - must be valid when other thread knows that particular thread
is started.
* ID - must be valid when code is executed inside thread */
#if defined(MHD_USE_POSIX_THREADS)
# ifdef MHD_PTHREAD_CREATE__SET_ID_BEFORE_START_THREAD
union _MHD_thread_handle_ID_
{
MHD_thread_handle_ handle; /**< To be used in other threads */
MHD_thread_ID_ ID; /**< To be used in thread itself */
};
typedef union _MHD_thread_handle_ID_ MHD_thread_handle_ID_;
# else /* ! MHD_PTHREAD_CREATE__SET_ID_BEFORE_START_THREAD */
struct _MHD_thread_handle_ID_
{
MHD_thread_handle_ handle; /**< To be used in other threads */
MHD_thread_ID_ ID; /**< To be used in thread itself */
};
typedef struct _MHD_thread_handle_ID_ MHD_thread_handle_ID_;
# endif /* ! MHD_PTHREAD_CREATE__SET_ID_BEFORE_START_THREAD */
#elif defined(MHD_USE_W32_THREADS)
struct _MHD_thread_handle_ID_
{
MHD_thread_handle_ handle; /**< To be used in other threads */
MHD_thread_ID_ ID; /**< To be used in thread itself */
};
typedef struct _MHD_thread_handle_ID_ MHD_thread_handle_ID_;
#endif
#if defined(MHD_USE_POSIX_THREADS)
/**
* Wait until specified thread is ended and free thread handle on success.
* @param thread handle to watch
* @return nonzero on success, zero otherwise
*/
#define MHD_join_thread_(thread) (! pthread_join ((thread), NULL))
#elif defined(MHD_USE_W32_THREADS)
/**
* Wait until specified thread is ended and free thread handle on success.
* @param thread handle to watch
* @return nonzero on success, zero otherwise
*/
#define MHD_join_thread_(thread) (WAIT_OBJECT_0 == WaitForSingleObject ( \
(thread), INFINITE) ? (CloseHandle ( \
(thread)), ! 0) : \
0)
#endif
#if defined(MHD_USE_POSIX_THREADS)
/**
* Check whether provided thread ID match current thread.
* @param ID thread ID to match
* @return nonzero on match, zero otherwise
*/
#define MHD_thread_ID_match_current_(ID) (pthread_equal ((ID), pthread_self ()))
#elif defined(MHD_USE_W32_THREADS)
/**
* Check whether provided thread ID match current thread.
* @param ID thread ID to match
* @return nonzero on match, zero otherwise
*/
#define MHD_thread_ID_match_current_(ID) (GetCurrentThreadId () == (ID))
#endif
#if defined(MHD_USE_POSIX_THREADS)
# ifdef MHD_PTHREAD_CREATE__SET_ID_BEFORE_START_THREAD
/**
* Initialise thread ID.
* @param thread_handle_ID_ptr pointer to thread handle-ID
*/
#define MHD_thread_init_(thread_handle_ID_ptr) (void) 0
# else /* ! MHD_PTHREAD_CREATE__SET_ID_BEFORE_START_THREAD */
/**
* Initialise thread ID.
* @param thread_handle_ID_ptr pointer to thread handle-ID
*/
#define MHD_thread_init_(thread_handle_ID_ptr) ((thread_handle_ID_ptr)->ID = \
pthread_self ())
# endif /* ! MHD_PTHREAD_CREATE__SET_ID_BEFORE_START_THREAD */
#elif defined(MHD_USE_W32_THREADS)
/**
* Initialise thread ID.
* @param thread_handle_ID_ptr pointer to thread handle-ID
*/
#define MHD_thread_init_(thread_handle_ID_ptr) ((thread_handle_ID_ptr)->ID = \
GetCurrentThreadId ())
#endif
/**
* Signature of main function for a thread.
*
* @param cls closure argument for the function
* @return termination code from the thread
*/
typedef MHD_THRD_RTRN_TYPE_
(MHD_THRD_CALL_SPEC_ *MHD_THREAD_START_ROUTINE_)(void *cls);
/**
* Create a thread and set the attributes according to our options.
*
* If thread is created, thread handle must be freed by MHD_join_thread_().
*
* @param thread handle to initialize
* @param stack_size size of stack for new thread, 0 for default
* @param start_routine main function of thread
* @param arg argument for start_routine
* @return non-zero on success; zero otherwise
*/
int
MHD_create_thread_ (MHD_thread_handle_ID_ *thread,
size_t stack_size,
MHD_THREAD_START_ROUTINE_ start_routine,
void *arg);
#ifndef MHD_USE_THREAD_NAME_
#define MHD_create_named_thread_(t,n,s,r,a) MHD_create_thread_ ((t),(s),(r),(a))
#else /* MHD_USE_THREAD_NAME_ */
/**
* Create a named thread and set the attributes according to our options.
*
* @param thread handle to initialize
* @param thread_name name for new thread
* @param stack_size size of stack for new thread, 0 for default
* @param start_routine main function of thread
* @param arg argument for start_routine
* @return non-zero on success; zero otherwise
*/
int
MHD_create_named_thread_ (MHD_thread_handle_ID_ *thread,
const char*thread_name,
size_t stack_size,
MHD_THREAD_START_ROUTINE_ start_routine,
void *arg);
#endif /* MHD_USE_THREAD_NAME_ */
#endif /* ! MHD_THREADS_H */
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