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Updated structure and added makefile

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This commit is contained in:
Mark Riddoch
2013-06-11 14:58:21 +01:00
parent bbe339ac78
commit e820e36aa3
18 changed files with 642 additions and 127 deletions
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6
compila
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@ -1,6 +0,0 @@
rm *.o
gcc -c gateway_mysql_protocol.c
gcc -c utils.c
gcc -c gw_utils.c
gcc -c gateway.c
gcc -o gateway gw_utils.o gateway.o utils.o gateway_mysql_protocol.o -lssl

27
core/Makefile Normal file
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@ -0,0 +1,27 @@
# This file is distributed as part of the SkySQL Gateway. It is free
# software: you can redistribute it and/or modify it under the terms of the
# GNU General Public License as published by the Free Software Foundation,
# version 2.
#
# 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 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# Copyright SkySQL Ab 2013
CC=cc
CFLAGS=-c -I../include
SRCS= atomic.c buffer.c spinlock.c gateway.c gateway_mysql_protocol.c gw_utils.c utils.c
OBJ=$(SRCS:.c=.o)
LIBS=-lssl
gateway: $(OBJ)
$(CC) $(LDFLAGS) $(OBJ) $(LIBS) -o $@
.c.o:
$(CC) $(CFLAGS) $< -o $@

49
core/atomic.c Normal file
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@ -0,0 +1,49 @@
/*
* This file is distributed as part of the SkySQL Gateway. It is free
* software: you can redistribute it and/or modify it under the terms of the
* GNU General Public License as published by the Free Software Foundation,
* version 2.
*
* 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 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Copyright SkySQL Ab 2013
*/
/*
* atomic.c - Implementation of atomic opertions for the gateway
*
* Revision History
*
* Date Who Description
* 10/06/13 Mark Riddoch Initial implementation
*
*/
/*
* Implementation of an atomic add operation for the X86 processor.
* Adds a value to the contents of a location pointed to by the first parameter.
* The add operation is atomic and the return value is the value stored in the location
* prior to the operation. The number that is added may be signed, therefore atomic_subtract
* is merely an atomic add with a negative value.
*
* @param variable Pointer the the variable to add to
* @param value Value to be added
* @return The value of *variable before the add occured
*/
int
atomic_add(int *variable, int value)
{
asm volatile(
"lock; xaddl %%eax, %2;"
:"=a" (value)
: "a" (value), "m" (*variable)
: "memory" );
return value;
}

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core/buffer.c Normal file
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/*
* This file is distributed as part of the SkySQL Gateway. It is free
* software: you can redistribute it and/or modify it under the terms of the
* GNU General Public License as published by the Free Software Foundation,
* version 2.
*
* 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 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Copyright SkySQL Ab 2013
*/
/*
* buffer.h - The Gateway buffer management functions
*
* Revision History
*
* Date Who Description
* 10/06/13 Mark Riddoch Initial implementation
*
*/
#include <stdlib.h>
#include <buffer.h>
/*
* Allocate a new gateway buffer structure of size bytes.
*
* For now we allocate memory directly from malloc for buffer the management
* structure and the actual data buffer itself. We may swap at a future date
* to a more effecient mechanism.
*
* @param size The size in bytes of the data area required
* @return Pointer to the buffer structure or NULL if memory could not
* be allocated.
*/
GWBUF *
gwbuf_alloc(unsigned int size)
{
GWBUF *rval;
// Allocate the buffer header
if ((rval = (GWBUF *)malloc(sizeof(GWBUF))) == NULL)
{
return NULL;
}
// Allocate the space for the actual data
if ((rval->data = (unsigned char *)malloc(size)) == NULL)
{
free(rval);
return NULL;
}
rval->start = rval->data;
rval->end = rval->start + size;
rval->next = NULL;
return rval;
}
/*
* Free a gateway buffer
*
* @param buf The buffer to free
*/
void
gwbuf_free(GWBUF *buf)
{
free(buf->data);
free(buf);
}
/*
* Append a buffer onto a linked list of buffer structures.
*
* This call should be made with the caller holding the lock for the linked
* list.
*
* @param head The current head of the linked list
* @param tail The new buffer to make the tail of the linked list
* @return The new head of the linked list
*/
GWBUF *
gwbuf_append(GWBUF *head, GWBUF *tail)
{
GWBUF *ptr = head;
if (!head)
return tail;
while (ptr->next)
{
ptr = ptr->next;
}
ptr->next = tail;
return head;
}
/*
* Consume data from a buffer in the linked list. The assumption is to consume
* n bytes from the buffer chain.
*
* If after consuming the bytes from the first buffer that buffer becomes
* empty it will be freed and the linked list updated.
*
* The return value is the new head of the linked list.
*
* This call should be made with the caller holding the lock for the linked
* list.
*
* @param head The head of the linked list
* @param length The amount of data to consume
* @return The head of the linked list
*/
GWBUF *
gwbuf_consume(GWBUF *head, unsigned int length)
{
GWBUF *rval = head;
GWBUF_CONSUME(head, length);
if (GWBUF_EMPTY(head))
{
rval = head->next;
gwbuf_free(head);
}
return rval;
}
/*
* Return the number of bytes of data in the linked list.
*
* @param head The current head of the linked list
* @return The number of bytes of data in the linked list
*/
unsigned int
gwbuf_length(GWBUF *head)
{
int rval = 0;
while (head)
{
rval += GWBUF_LENGTH(head);
head = head->next;
}
return rval;
}

51
gateway.c → core/gateway.c
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@ -1,32 +1,33 @@
/* /*
This file is distributed as part of the SkySQL Gateway. It is free * This file is distributed as part of the SkySQL Gateway. It is free
software: you can redistribute it and/or modify it under the terms of the * software: you can redistribute it and/or modify it under the terms of the
GNU General Public License as published by the Free Software Foundation, * GNU General Public License as published by the Free Software Foundation,
version 2. * version 2.
*
This program is distributed in the hope that it will be useful, but WITHOUT * 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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
details. * details.
*
You should have received a copy of the GNU General Public License along with * 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 * this program; if not, write to the Free Software Foundation, Inc., 51
Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
Copyright SkySQL Ab * Copyright SkySQL Ab 2013
*
*/ */
/* /*
23-05-2013 * Revision History
epoll loop test *
Massimiliano Pinto * Date Who Description
*/ * 23-05-2013 Massimiliano Pinto epoll loop test
*
*/
#include "gw.h" #include <gw.h>
#include "dcb.h" #include <dcb.h>
#include "session.h" #include <session.h>
// epoll fd, global! // epoll fd, global!
static int epollfd; static int epollfd;

58
gateway_mysql_protocol.c → core/gateway_mysql_protocol.c
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@ -1,37 +1,37 @@
/* /*
This file is distributed as part of the SkySQL Gateway. It is free * This file is distributed as part of the SkySQL Gateway. It is free
software: you can redistribute it and/or modify it under the terms of the * software: you can redistribute it and/or modify it under the terms of the
GNU General Public License as published by the Free Software Foundation, * GNU General Public License as published by the Free Software Foundation,
version 2. * version 2.
*
This program is distributed in the hope that it will be useful, but WITHOUT * 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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
details. * details.
*
You should have received a copy of the GNU General Public License along with * 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 * this program; if not, write to the Free Software Foundation, Inc., 51
Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
Copyright SkySQL Ab * Copyright SkySQL Ab 2013
*
*/ */
/* /*
23-05-2013 * Revision History
Empty mysql_protocol_handling *
1)send handshake in accept * Date Who Description
* 23-05-2013 Massimiliano Pinto Empty mysql_protocol_handling
* 1)send handshake in accept
* 2) read data
* 3) alway send OK
*
*/
2) read data
3) alway send OK
Massimiliano Pinto #include <gw.h>
*/ #include <dcb.h>
#include <session.h>
#include "gw.h"
#include "dcb.h"
#include "session.h"
#define MYSQL_CONN_DEBUG #define MYSQL_CONN_DEBUG
//#undef MYSQL_CONN_DEBUG //#undef MYSQL_CONN_DEBUG

48
gw_utils.c → core/gw_utils.c
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@ -1,30 +1,32 @@
/* /*
This file is distributed as part of the SkySQL Gateway. It is free * This file is distributed as part of the SkySQL Gateway. It is free
software: you can redistribute it and/or modify it under the terms of the * software: you can redistribute it and/or modify it under the terms of the
GNU General Public License as published by the Free Software Foundation, * GNU General Public License as published by the Free Software Foundation,
version 2. * version 2.
*
This program is distributed in the hope that it will be useful, but WITHOUT * 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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
details. * details.
*
You should have received a copy of the GNU General Public License along with * 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 * this program; if not, write to the Free Software Foundation, Inc., 51
Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
Copyright SkySQL Ab * Copyright SkySQL Ab 2013
*
*/ */
/* /*
03-06-2013 * Revision History
gateway utils *
Massimiliano Pinto * Date Who Description
*/ * 03-06-2013 Massimiliano Pinto gateway utils
*
*/
#include "gw.h" #include <gw.h>
#include "dcb.h" #include <dcb.h>
/// ///
// set ip address in sockect struct // set ip address in sockect struct

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core/spinlock.c Normal file
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@ -0,0 +1,98 @@
/*
* This file is distributed as part of the SkySQL Gateway. It is free
* software: you can redistribute it and/or modify it under the terms of the
* GNU General Public License as published by the Free Software Foundation,
* version 2.
*
* 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 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Copyright SkySQL Ab 2013
*/
/*
* spinlock.c - Spinlock operations for the SkySQL Gateway
*
* Revision History
*
* Date Who Description
* 10/06/13 Mark Riddoch Initial implementation
*
*/
#include <spinlock.h>
#include <atomic.h>
/*
* Initialise a spinlock.
*
* @param lock The spinlock to initialise.
*/
void
spinlock_init(SPINLOCK *lock)
{
lock->lock = 0;
#ifdef DEBUG
lock->spins = 0;
lock->acquired = 0;
#endif
}
/*
* Acquire a spinlock.
*
* @param lock The spinlock to acquire
*/
void
spinlock_acquire(SPINLOCK *lock)
{
while (atomic_add(&(lock->lock), 1) != 0)
{
atomic_add(&(lock->lock), -1);
#ifdef DEBUG
atomic_add(&(lock->spins), 1);
#endif
}
#ifdef DEBUG
lock->acquired++;
lock->owner = THREAD_SHELF();
#endif
}
/*
* Acquire a spinlock if it is not already locked.
*
* @param lock The spinlock to acquire
* @return True ifthe spinlock was acquired, otherwise false
*/
int
spinlock_acquire_nowait(SPINLOCK *lock)
{
if (atomic_add(&(lock->lock), 1) != 0)
{
atomic_add(&(lock->lock), -1);
return FALSE;
}
#ifdef DEBUG
lock->acquired++;
lock->owner = THREAD_SHELF();
#endif
return TRUE;
}
/*
* Release a spinlock.
*
* @param lock The spinlock to release
*/
void
spinlock_release(SPINLOCK *lock)
{
atomic_add(&(lock->lock), -1);
}

47
utils.c → core/utils.c
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@ -1,26 +1,35 @@
/* /*
This file is distributed as part of the SkySQL Gateway. It is free * This file is distributed as part of the SkySQL Gateway. It is free
software: you can redistribute it and/or modify it under the terms of the * software: you can redistribute it and/or modify it under the terms of the
GNU General Public License as published by the Free Software Foundation, * GNU General Public License as published by the Free Software Foundation,
version 2. * version 2.
*
* 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 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Copyright SkySQL Ab 2013
*
*/
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 * Revision History
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more *
details. * Date Who Description
* 10/06/13 Massimiliano Pinto Initial implementation
*
*/
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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
Copyright SkySQL Ab #include <gw.h>
#include <dcb.h>
*/ #include <session.h>
#include <mysql_protocol.h>
#include "gw.h"
#include "dcb.h"
#include "session.h"
#include "mysql_protocol.h"
#include <openssl/sha.h> #include <openssl/sha.h>
// used in the hex2bin function // used in the hex2bin function

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include/atomic.h Normal file
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@ -0,0 +1,32 @@
#ifndef _ATOMIC_H
#define _ATOMIC_H
/*
* This file is distributed as part of the SkySQL Gateway. It is free
* software: you can redistribute it and/or modify it under the terms of the
* GNU General Public License as published by the Free Software Foundation,
* version 2.
*
* 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 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Copyright SkySQL Ab 2013
*/
/*
* The atomic operations used within the gateway
*
* Revision History
*
* Date Who Description
* 10/06/13 Mark Riddoch Initial implementation
*
*/
extern int atomic_add(int *variable, int value);
#endif

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include/buffer.h Normal file
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@ -0,0 +1,64 @@
#ifndef _BUFFER_H
#define _BUFFER_H
/*
* This file is distributed as part of the SkySQL Gateway. It is free
* software: you can redistribute it and/or modify it under the terms of the
* GNU General Public License as published by the Free Software Foundation,
* version 2.
*
* 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 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Copyright SkySQL Ab 2013
*/
/*
* Definitions relating the gateway buffer manipulation facilities.
* These are used to store all data coming in form or going out to the client and the
* backend structures.
*
* The buffers are designed to be used in linked lists and such that they may be passed
* from one side of the gateway to another without the need to copy data. It may be the case
* that not all of the data in the buffer is valid, to this end a start and end pointer are
* included that point to the first valid byte in the buffer and the first byte after the
* last valid byte. This allows data to be consumed from either end of the buffer whilst
* still allowing for the copy free semantics of the buffering system.
*
* Revision History
*
* Date Who Description
* 10/06/13 Mark Riddoch Initial implementation
*
*/
typedef struct gwbuf {
struct gwbuf *next; // Next buffer in a linked chain of buffers
void *start; // Start of the valid data
void *end; // First byte after the valid data
unsigned char *data; // Physical memory that was allocated
} GWBUF;
/*
* Macros to access the data in the buffers
*/
#define GWBUF_DATA(b) ((b)->start)
#define GWBUF_LENGTH(b) ((b)->end - (b)->start)
#define GWBUF_EMPTY(b) ((b)->start == (b)->end)
#define GWBUF_CONSUME(b, bytes) (b)->start += bytes
/*
* Function prototypes for the API to maniplate the buffers
*/
extern GWBUF *gwbuf_alloc(unsigned int size);
extern void gwbuf_free(GWBUF *buf);
extern GWBUF *gwbuf_append(GWBUF *head, GWBUF *tail);
extern GWBUF *gwbuf_consume(GWBUF *head, unsigned int length);
extern unsigned int gwbuf_length(GWBUF *head);
#endif

12
dcb.h → include/dcb.h
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@ -15,7 +15,7 @@
* this program; if not, write to the Free Software Foundation, Inc., 51 * this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
* *
* Copyright SkySQL Ab * Copyright SkySQL Ab 2013
*/ */
struct session; struct session;
@ -23,6 +23,13 @@ struct session;
/* /*
* The function pointer table used by descriptors to call relevant functions * The function pointer table used by descriptors to call relevant functions
* within the protocol specific code. * within the protocol specific code.
*
* Revision History
*
* Date Who Description
* 1/06/13 Mark Riddoch Initial implementation
*
*/
*/ */
struct dcb; struct dcb;
@ -33,9 +40,10 @@ typedef struct gw_protocol {
*/ */
int (*read)(struct dcb *, int); int (*read)(struct dcb *, int);
int (*write)(struct dcb *, int); int (*write)(struct dcb *, int);
int (*write_ready)(struct dcb *);
int (*error)(struct dcb *, int); int (*error)(struct dcb *, int);
int (*accept)(struct dcb *, int); int (*accept)(struct dcb *, int);
//int (*close)(struct dcb *); int (*close)(struct dcb *);
} GWPROTOCOL; } GWPROTOCOL;
/* /*

46
gateway_mysql.h → include/gateway_mysql.h
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@ -1,26 +1,30 @@
/* /*
This file is distributed as part of the SkySQL Gateway. It is free * This file is distributed as part of the SkySQL Gateway. It is free
software: you can redistribute it and/or modify it under the terms of the * software: you can redistribute it and/or modify it under the terms of the
GNU General Public License as published by the Free Software Foundation, * GNU General Public License as published by the Free Software Foundation,
version 2. * version 2.
*
* 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 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Copyright SkySQL Ab 2013
*
*/
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 * MYSQL mysql protocol header file
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more * Revision History
details. *
* Date Who Description
You should have received a copy of the GNU General Public License along with * 10/06/13 Massimiliano Pinto Initial implementation
this program; if not, write to the Free Software Foundation, Inc., 51 *
Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */
Copyright SkySQL Ab
*/
////////////////////////////////////////
// MYSQL mysql protocol header file
// By Massimiliano Pinto 2012/2013
////////////////////////////////////////
/* Protocol packing macros. */ /* Protocol packing macros. */
#define gw_mysql_set_byte2(__buffer, __int) do { \ #define gw_mysql_set_byte2(__buffer, __int) do { \

0
gw.h → include/gw.h
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2
mysql_protocol.h → include/mysql_protocol.h
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@ -15,7 +15,7 @@
* this program; if not, write to the Free Software Foundation, Inc., 51 * this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
* *
* Copyright SkySQL Ab * Copyright SkySQL Ab 2013
*/ */
#ifndef MYSQL_SCRAMBLE_LEN #ifndef MYSQL_SCRAMBLE_LEN

2
session.h → include/session.h
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@ -15,7 +15,7 @@
* this program; if not, write to the Free Software Foundation, Inc., 51 * this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
* *
* Copyright SkySQL Ab * Copyright SkySQL Ab 2013
*/ */
struct dcb; struct dcb;

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include/spinlock.h Normal file
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@ -0,0 +1,51 @@
#ifndef _SPINLOCK_H
#define _SPINLOCK_H
/*
* This file is distributed as part of the SkySQL Gateway. It is free
* software: you can redistribute it and/or modify it under the terms of the
* GNU General Public License as published by the Free Software Foundation,
* version 2.
*
* 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 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Copyright SkySQL Ab 2013
*/
/*
* Spinlock implementation for ther gateway.
*
* Spinlocks are cheap locks that can be used to protect short code blocks, they are
* generally wasteful as any blocked threads will spin, consuming CPU cycles, waiting
* for the lock to be released. However they are useful in that they do not involve
* system calls and are light weight when the expected wait time for a lock is low.
*/
#include <thread.h>
typedef struct spinlock {
int lock;
#if DEBUG
int spins;
int acquired;
THREAD owner;
#endif
} SPINLOCK;
#ifndef TRUE
#define TRUE (1 == 1)
#endif
#ifndef FALSE
#define FALSE (1 == 0)
#endif
extern void spinlock_init(SPINLOCK *lock);
extern void spinlock_acquire(SPINLOCK *lock);
extern int spinlock_acquire_nowait(SPINLOCK *lock);
extern void spinlock_release(SPINLOCK *lock);
#endif

25
include/thread.h Normal file
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@ -0,0 +1,25 @@
#ifndef _THREAD_H
#define _THREAD_H
/*
* This file is distributed as part of the SkySQL Gateway. It is free
* software: you can redistribute it and/or modify it under the terms of the
* GNU General Public License as published by the Free Software Foundation,
* version 2.
*
* 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 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Copyright SkySQL Ab 2013
*/
#include <pthread.h>
#define THREAD pthread_t
#define THREAD_SHELF pthread_self
#endif