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#ifndef CYGONCE_KERNEL_MQUEUE_HXX
#define CYGONCE_KERNEL_MQUEUE_HXX
/*========================================================================
//
// mqueue.hxx
//
// Message queues
//
//========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
//
// eCos 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; either version 2 or (at your option) any later
// version.
//
// eCos 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 eCos; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// As a special exception, if other files instantiate templates or use
// macros or inline functions from this file, or you compile this file
// and link it with other works to produce a work based on this file,
// this file does not by itself cause the resulting work to be covered by
// the GNU General Public License. However the source code for this file
// must still be made available in accordance with section (3) of the GNU
// General Public License v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): jlarmour
// Contributors:
// Date: 2000-05-09
// Purpose: This file provides the interface for eCos message queues
// Description: This differs from the message boxes also supported by
// eCos primarily because the requirements of message
// queues are driven by POSIX semantics. POSIX semantics are
// more dynamic and therefore heavyweight than Mboxes,
// including prioritization, and variable sized queues and
// message lengths
// Usage: #include <cyg/kernel/mqueue.hxx>
//
//####DESCRIPTIONEND####
//
//======================================================================
*/
/* CONFIGURATION */
#include <pkgconf/kernel.h> /* Configuration header */
/* INCLUDES */
#include <stddef.h> /* size_t */
#include <cyg/infra/cyg_type.h> /* Types */
#include <cyg/infra/cyg_ass.h> /* CYGDBG_DEFINE_CHECK_THIS,
CYGDBG_USE_ASSERTS */
#include <cyg/kernel/ktypes.h> /* Kernel package types */
#include <cyg/kernel/sema.hxx> /* Cyg_Counting_Semaphore */
/* CLASSES */
class Cyg_Mqueue {
public:
typedef void (*callback_fn_t)(Cyg_Mqueue &q, CYG_ADDRWORD data);
typedef void * (*qalloc_fn_t)(size_t len);
typedef void (*qfree_fn_t)(void *ptr, size_t len);
typedef enum {
OK=0,
NOMEM,
WOULDBLOCK,
#ifdef CYGFUN_KERNEL_THREADS_TIMER
TIMEOUT,
#endif
INTR
} qerr_t;
protected:
struct qentry {
struct qentry *next;
unsigned int priority;
size_t buflen;
volatile bool busy;
// data buffer follows here
char *buf() const { return (char *)this + sizeof(*this); }
};
Cyg_Counting_Semaphore putsem, getsem;
struct qentry *q; // q entries in use
struct qentry *freelist; // q entries not in use
void *queuespace; // placeholder for the dynamically allocated
// area
size_t queuespacesize;
qfree_fn_t free_fn; // how to free queuespace when we destruct
callback_fn_t callback;
CYG_ADDRWORD callback_data;
CYGDBG_DEFINE_CHECK_THIS
#ifdef CYGDBG_USE_ASSERTS
long qlen;
size_t msgsize;
#endif
public:
Cyg_Mqueue( long maxmsgs, long maxmsgsize,
qalloc_fn_t qalloc, qfree_fn_t qfree, qerr_t *err );
~Cyg_Mqueue();
// put() copies len bytes of *buf into the queue at priority prio
qerr_t put( const char *buf, size_t len, unsigned int prio, bool block=true
#ifdef CYGFUN_KERNEL_THREADS_TIMER
,cyg_tick_count timeout = 0
#endif
);
// get() returns the oldest highest priority message in the queue in *buf
// and sets *prio to the priority (if prio is non-NULL) and *len to the
// actual message size
qerr_t get( char *buf, size_t *len, unsigned int *prio, bool block=true
#ifdef CYGFUN_KERNEL_THREADS_TIMER
,cyg_tick_count timeout = 0
#endif
);
// count() returns the number of messages in the queue
long count();
// Supply a callback function to call (with the supplied data argument)
// when the queue goes from empty to non-empty (unless someone's already
// doing a get()). This returns the old callback_fn, and if olddata is
// non-NULL sets it to the old data (yes, really!)
callback_fn_t setnotify( callback_fn_t callback_fn, CYG_ADDRWORD data,
CYG_ADDRWORD *olddata=NULL);
}; /* class Cyg_Mqueue */
#ifndef CYGIMP_KERNEL_SYNCH_MQUEUE_NOT_INLINE
# include <cyg/kernel/mqueue.inl>
#endif
#endif /* CYGONCE_KERNEL_MQUEUE_HXX multiple inclusion protection */
/* EOF mqueue.hxx */
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