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/* $Id: vthread.h,v 1.2 2005/02/23 18:58:12 ellson Exp $ $Revision: 1.2 $ */
/* vim:set shiftwidth=4 ts=8: */
/**********************************************************
* This software is part of the graphviz package *
* http://www.graphviz.org/ *
* *
* Copyright (c) 1994-2004 AT&T Corp. *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Corp. *
* *
* Information and Software Systems Research *
* AT&T Research, Florham Park NJ *
**********************************************************/
#ifdef __cplusplus
extern "C" {
#endif
#ifndef _VTHREAD_H
#define _VTHREAD_H 1
#define VTHREAD_VERSION 20001201L
/* Header for the Vthread library.
** Note that the macro vt_threaded may be defined
** outside of vthread.h to suppress threading.
**
** Written by Kiem-Phong Vo
*/
#include <ast_common.h>
#include <errno.h>
/* ast doesn't do threads yet */
#if _PACKAGE_ast && !defined(vt_threaded)
#define vt_threaded 0
#endif
#if !defined(vt_threaded) || (defined(vt_threaded) && vt_threaded == 1)
#define _may_use_threads 1
#else
#define _may_use_threads 0
#endif
#undef vt_threaded
#if _may_use_threads && !defined(vt_threaded) && _hdr_pthread
#define vt_threaded 1
#include <pthread.h>
typedef pthread_mutex_t _vtmtx_t;
typedef pthread_once_t _vtonce_t;
typedef pthread_t _vtself_t;
typedef pthread_t _vtid_t;
typedef pthread_attr_t _vtattr_t;
#if !defined(PTHREAD_ONCE_INIT) && defined(pthread_once_init)
#define PTHREAD_ONCE_INIT pthread_once_init
#endif
#endif
#if _may_use_threads && !defined(vt_threaded) && _WIN32
#define vt_threaded 1
#include <windows.h>
typedef CRITICAL_SECTION _vtmtx_t;
typedef int _vtonce_t;
typedef HANDLE _vtself_t;
typedef DWORD _vtid_t;
typedef SECURITY_ATTRIBUTES _vtattr_t;
#endif
#ifndef vt_threaded
#define vt_threaded 0
#endif
/* common attributes for various structures */
#define VT_RUNNING 000000001 /* thread is running */
#define VT_SUSPENDED 000000002 /* thread is suspended */
#define VT_WAITED 000000004 /* thread has been waited */
#define VT_FREE 000010000 /* object can be freed */
#define VT_INIT 000020000 /* object was initialized */
#define VT_BITS 000030007 /* bits that we care about */
/* directives for vtset() */
#define VT_STACK 1 /* set stack size */
typedef struct _vtmutex_s Vtmutex_t;
typedef struct _vtonce_s Vtonce_t;
typedef struct _vthread_s Vthread_t;
#ifndef EINVAL
#define EINVAL 22
#endif
#ifndef EBUSY
#define EBUSY 16
#endif
#ifndef EDEADLK
#define EDEADLK 45
#endif
#ifndef EPERM
#define EPERM 1
#endif
_BEGIN_EXTERNS_ extern Vthread_t *vtopen _ARG_((Vthread_t *, int));
extern int vtclose _ARG_((Vthread_t *));
extern int vtset _ARG_((Vthread_t *, int, Void_t *));
extern int vtrun _ARG_((Vthread_t *, void *(*)(void *), void *));
extern int vtkill _ARG_((Vthread_t *));
extern int vtwait _ARG_((Vthread_t *));
/* extern int vtonce _ARG_((Vtonce_t *, void (*)())); */
extern Vtmutex_t *vtmtxopen _ARG_((Vtmutex_t *, int));
extern int vtmtxclose _ARG_((Vtmutex_t *));
extern int vtmtxlock _ARG_((Vtmutex_t *));
extern int vtmtxtrylock _ARG_((Vtmutex_t *));
extern int vtmtxunlock _ARG_((Vtmutex_t *));
extern int vtmtxclrlock _ARG_((Vtmutex_t *));
extern Void_t *vtstatus _ARG_((Vthread_t *));
extern int vterror _ARG_((Vthread_t *));
extern int vtmtxerror _ARG_((Vtmutex_t *));
extern int vtonceerror _ARG_((Vtonce_t *));
_END_EXTERNS_
#if vt_threaded
/* mutex structure */
struct _vtmutex_s {
_vtmtx_t lock;
int count;
_vtid_t owner;
int state;
int error;
};
/* structure for states of thread */
struct _vthread_s {
_vtself_t self; /* self-handle */
_vtid_t id; /* thread id */
_vtattr_t attrs; /* attributes */
size_t stack; /* stack size */
int state; /* execution state */
int error; /* error status */
Void_t *exit; /* exit value */
};
/* structure for exactly once execution */
struct _vtonce_s {
int done;
_vtonce_t once;
int error;
};
#if _WIN32
#define VTONCE_INITDATA {0, 0}
#else
#define VTONCE_INITDATA {0, PTHREAD_ONCE_INIT }
#endif
#define vtstatus(vt) ((vt)->exit)
#define vterror(vt) ((vt)->error)
#define vtmtxerror(mtx) ((mtx)->error)
#define vtonceerror(once) ((once)->error)
#endif /*vt_threaded */
/* fake structures and functions */
#if !vt_threaded
struct _vtmutex_s {
int error;
};
struct _vtattr_s {
int error;
};
struct _vthread_s {
int error;
};
struct _vtonce_s {
int error;
};
#define VTONCE_INITDATA {0}
#define vtopen(vt,flgs) ((Vthread_t*)0)
#define vtclose(vt) (-1)
#define vtkill(vt) (-1)
#define vtwait(vt) (-1)
#define vtrun(vt,fn,arg) (-1)
#define vtset(vt,t,v) (-1)
#define vtonce(on,fu) (-1)
#define vtmtxopen(mtx,flgs) (void)((Vtmutex_t*)0)
#define vtmtxclose(mtx) (void)(-1)
#define vtmtxlock(mtx) (void)(-1)
#define vtmtxtrylock(mtx) (-1)
#define vtmtxunlock(mtx) (void)(-1)
#define vtmtxclrlock(mtx) (void)(-1)
#define vtstatus(vt) ((Void_t*)0)
#define vterror(vt) (0)
#define vtmtxerror(mtx) (0)
#define vtonceerror(once) (0)
#endif /*!vt_threaded */
#endif /*_VTHREAD_H*/
#ifdef __cplusplus
}
#endif
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