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/*
* C11 <threads.h> emulation library
*
* (C) Copyright yohhoy 2012.
* Copyright 2022 Yonggang Luo
* Distributed under the Boost Software License, Version 1.0.
*
* Permission is hereby granted, free of charge, to any person or
* organization obtaining a copy of the software and accompanying
* documentation covered by this license (the "Software") to use,
* reproduce, display, distribute, execute, and transmit the Software,
* and to prepare [[derivative work]]s of the Software, and to permit
* third-parties to whom the Software is furnished to do so, all
* subject to the following:
*
* The copyright notices in the Software and this entire statement,
* including the above license grant, this restriction and the
* following disclaimer, must be included in all copies of the
* Software, in whole or in part, and all derivative works of the
* Software, unless such copies or derivative works are solely in the
* form of machine-executable object code generated by a source
* language processor.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE AND
* NON-INFRINGEMENT. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR ANYONE
* DISTRIBUTING THE SOFTWARE BE LIABLE FOR ANY DAMAGES OR OTHER
* LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#ifndef KIT_C11_THREADS_H_INCLUDED_
#define KIT_C11_THREADS_H_INCLUDED_
#include "time.h"
#include <errno.h>
#include <limits.h>
#include <stdlib.h>
#if defined(_WIN32) && !defined(__CYGWIN__)
# include <io.h> /* close */
# include <process.h> /* _exit */
#elif defined(KIT_HAVE_PTHREAD)
# include <pthread.h>
# include <unistd.h> /* close, _exit */
#else
# error Not supported on this platform.
#endif
/*---------------------------- macros ---------------------------*/
#ifndef _Thread_local
# if defined(__cplusplus)
/* C++11 doesn't need `_Thread_local` keyword or macro */
# elif !defined(__STDC_NO_THREADS__)
/* threads are optional in C11, _Thread_local present in this
* condition */
# elif defined(_MSC_VER)
# define _Thread_local __declspec(thread)
# elif defined(__GNUC__)
# define _Thread_local __thread
# else
/* Leave _Thread_local undefined so that use of _Thread_local would
* not promote to a non-thread-local global variable
*/
# endif
#endif
#if !defined(__cplusplus)
/*
* C11 thread_local() macro
* C++11 and above already have thread_local keyword
*/
# ifndef thread_local
# if _MSC_VER
# define thread_local __declspec(thread)
# else
# define thread_local _Thread_local
# endif
# endif
#endif
#ifdef __cplusplus
extern "C" {
#endif
/*---------------------------- types ----------------------------*/
typedef void (*tss_dtor_t)(void *);
typedef int (*thrd_start_t)(void *);
#if defined(_WIN32) && !defined(__CYGWIN__)
typedef struct {
void *Ptr;
} cnd_t;
/* Define thrd_t as struct type intentionally for avoid use of thrd_t
* as pointer type */
typedef struct {
void *handle;
} thrd_t;
typedef unsigned long tss_t;
typedef struct {
void *DebugInfo;
long LockCount;
long RecursionCount;
void *OwningThread;
void *LockSemaphore;
uintptr_t SpinCount;
} mtx_t; /* Mock of CRITICAL_SECTION */
typedef struct {
volatile uintptr_t status;
} once_flag;
// FIXME: temporary non-standard hack to ease transition
# define KIT_MTX_INITIALIZER_NP_ \
{ (void *) -1, -1, 0, 0, 0, 0 }
# define ONCE_FLAG_INIT \
{ 0 }
# define TSS_DTOR_ITERATIONS 1
#elif defined(KIT_HAVE_PTHREAD)
typedef pthread_cond_t cnd_t;
typedef pthread_t thrd_t;
typedef pthread_key_t tss_t;
typedef pthread_mutex_t mtx_t;
typedef pthread_once_t once_flag;
// FIXME: temporary non-standard hack to ease transition
# define KIT_MTX_INITIALIZER_NP_ PTHREAD_MUTEX_INITIALIZER
# define ONCE_FLAG_INIT PTHREAD_ONCE_INIT
# ifdef PTHREAD_DESTRUCTOR_ITERATIONS
# define TSS_DTOR_ITERATIONS PTHREAD_DESTRUCTOR_ITERATIONS
# else
# define TSS_DTOR_ITERATIONS \
1 // assume TSS dtor MAY be called at least once.
# endif
#else
# error Not supported on this platform.
#endif
/*-------------------- enumeration constants --------------------*/
enum {
mtx_plain = 0,
mtx_recursive = 1,
mtx_timed = 2,
};
enum {
thrd_success = 0, // succeeded
thrd_timedout, // timed out
thrd_error, // failed
thrd_busy, // resource busy
thrd_nomem // out of memory
};
/*-------------------------- functions --------------------------*/
void call_once(once_flag *, void (*)(void));
int cnd_broadcast(cnd_t *);
void cnd_destroy(cnd_t *);
int cnd_init(cnd_t *);
int cnd_signal(cnd_t *);
int cnd_timedwait(cnd_t *__restrict, mtx_t *__restrict mtx_,
const struct timespec *__restrict);
int cnd_wait(cnd_t *, mtx_t *mtx_);
void mtx_destroy(mtx_t *mtx_);
int mtx_init(mtx_t *mtx_, int);
int mtx_lock(mtx_t *mtx_);
int mtx_timedlock(mtx_t *__restrict mtx_,
const struct timespec *__restrict);
int mtx_trylock(mtx_t *mtx_);
int mtx_unlock(mtx_t *mtx_);
int thrd_create(thrd_t *, thrd_start_t, void *);
thrd_t thrd_current(void);
int thrd_detach(thrd_t);
int thrd_equal(thrd_t, thrd_t);
#if defined(__cplusplus)
[[ noreturn ]]
#else
//_Noreturn
#endif
void thrd_exit(int);
int thrd_join(thrd_t, int *);
int thrd_sleep(const struct timespec *, struct timespec *);
void thrd_yield(void);
int tss_create(tss_t *, tss_dtor_t);
void tss_delete(tss_t);
void *tss_get(tss_t);
int tss_set(tss_t, void *);
#ifdef __cplusplus
}
#endif
#endif /* KIT_C11_THREADS_H_INCLUDED_ */
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