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/*
* Copyright (c) 2008, 2009, Wayne Meissner
*
* All rights reserved.
*
* This file is part of ruby-ffi.
*
* This code is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License version 3 only, as
* published by the Free Software Foundation.
*
* This code 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
* version 3 for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with this work. If not, see <http://www.gnu.org/licenses/>.
*/
#include <sys/param.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include <errno.h>
#include <ruby.h>
#include "LastError.h"
#if defined(HAVE_NATIVETHREAD) && !defined(_WIN32) && !defined(__WIN32__)
# include <pthread.h>
# define USE_PTHREAD_LOCAL
#endif
typedef struct ThreadData {
int td_errno;
} ThreadData;
#if defined(USE_PTHREAD_LOCAL)
static pthread_key_t threadDataKey;
#endif
static inline ThreadData* thread_data_get(void);
#if defined(USE_PTHREAD_LOCAL)
static ThreadData*
thread_data_init(void)
{
ThreadData* td = xcalloc(1, sizeof(ThreadData));
pthread_setspecific(threadDataKey, td);
return td;
}
static inline ThreadData*
thread_data_get(void)
{
ThreadData* td = pthread_getspecific(threadDataKey);
return td != NULL ? td : thread_data_init();
}
static void
thread_data_free(void *ptr)
{
xfree(ptr);
}
#else
static ID id_thread_data;
static ThreadData*
thread_data_init(void)
{
ThreadData* td;
VALUE obj;
obj = Data_Make_Struct(rb_cObject, ThreadData, NULL, -1, td);
rb_thread_local_aset(rb_thread_current(), id_thread_data, obj);
return td;
}
static inline ThreadData*
thread_data_get()
{
VALUE obj = rb_thread_local_aref(rb_thread_current(), id_thread_data);
if (obj != Qnil && TYPE(obj) == T_DATA) {
return (ThreadData *) DATA_PTR(obj);
}
return thread_data_init();
}
#endif
/*
* call-seq: error
* @return [Numeric]
* Get +errno+ value.
*/
static VALUE
get_last_error(VALUE self)
{
return INT2NUM(thread_data_get()->td_errno);
}
/*
* call-seq: error(error)
* @param [Numeric] error
* @return [nil]
* Set +errno+ value.
*/
static VALUE
set_last_error(VALUE self, VALUE error)
{
#ifdef _WIN32
SetLastError(NUM2INT(error));
#else
errno = NUM2INT(error);
#endif
return Qnil;
}
void
rbffi_save_errno(void)
{
int error = 0;
#ifdef _WIN32
error = GetLastError();
#else
error = errno;
#endif
thread_data_get()->td_errno = error;
}
void
rbffi_LastError_Init(VALUE moduleFFI)
{
/*
* Document-module: FFI::LastError
* This module defines a couple of method to set and get +errno+
* for current thread.
*/
VALUE moduleError = rb_define_module_under(moduleFFI, "LastError");
rb_define_module_function(moduleError, "error", get_last_error, 0);
rb_define_module_function(moduleError, "error=", set_last_error, 1);
#if defined(USE_PTHREAD_LOCAL)
pthread_key_create(&threadDataKey, thread_data_free);
#else
id_thread_data = rb_intern("ffi_thread_local_data");
#endif /* USE_PTHREAD_LOCAL */
}
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