_unixos.h

Netscape NSPR库源码

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 * 
 * The Original Code is the Netscape Portable Runtime (NSPR).
 * 
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are 
 * Copyright (C) 1998-2000 Netscape Communications Corporation.  All
 * Rights Reserved.
 * 
 * Contributor(s):
 * 
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL"), in which case the provisions of the GPL are applicable 
 * instead of those above.  If you wish to allow use of your 
 * version of this file only under the terms of the GPL and not to
 * allow others to use your version of this file under the MPL,
 * indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by
 * the GPL.  If you do not delete the provisions above, a recipient
 * may use your version of this file under either the MPL or the
 * GPL.
 */

#ifndef prunixos_h___
#define prunixos_h___

/*
 * If FD_SETSIZE is not defined on the command line, set the default value
 * before include select.h
 */
/*
 * Linux: FD_SETSIZE is defined in /usr/include/sys/select.h and should
 * not be redefined.
 */
#if !defined(LINUX) && !defined(DARWIN) && !defined(NEXTSTEP)
#ifndef FD_SETSIZE
#define FD_SETSIZE  4096
#endif
#endif

#include <unistd.h>
#include <stddef.h>
#include <sys/stat.h>
#include <dirent.h>
#include <errno.h>

#include "prio.h"
#include "prmem.h"
#include "prclist.h"

/*
 * For select(), fd_set, and struct timeval.
 *
 * In The Single UNIX(R) Specification, Version 2,
 * the header file for select() is <sys/time.h>.
 *
 * fd_set is defined in <sys/types.h>.  Usually
 * <sys/time.h> includes <sys/types.h>, but on some
 * older systems <sys/time.h> does not include
 * <sys/types.h>, so we include it explicitly.
 */
#include <sys/time.h>
#include <sys/types.h>
#if defined(AIX)  /* Only pre-4.2 AIX needs it, but for simplicity... */
#include <sys/select.h>
#endif

#define PR_DIRECTORY_SEPARATOR		'/'
#define PR_DIRECTORY_SEPARATOR_STR	"/"
#define PR_PATH_SEPARATOR		':'
#define PR_PATH_SEPARATOR_STR		":"
#define GCPTR
typedef int (*FARPROC)();

/*
 * intervals at which GLOBAL threads wakeup to check for pending interrupt
 */
#define _PR_INTERRUPT_CHECK_INTERVAL_SECS 5
extern PRIntervalTime intr_timeout_ticks;

/*
 * The bit flags for the in_flags and out_flags fields
 * of _PR_UnixPollDesc
 */
#ifdef _PR_USE_POLL
#define _PR_UNIX_POLL_READ    POLLIN
#define _PR_UNIX_POLL_WRITE   POLLOUT
#define _PR_UNIX_POLL_EXCEPT  POLLPRI
#define _PR_UNIX_POLL_ERR     POLLERR
#define _PR_UNIX_POLL_NVAL    POLLNVAL
#define _PR_UNIX_POLL_HUP     POLLHUP
#else /* _PR_USE_POLL */
#define _PR_UNIX_POLL_READ    0x1
#define _PR_UNIX_POLL_WRITE   0x2
#define _PR_UNIX_POLL_EXCEPT  0x4
#define _PR_UNIX_POLL_ERR     0x8
#define _PR_UNIX_POLL_NVAL    0x10
#define _PR_UNIX_POLL_HUP     0x20
#endif /* _PR_USE_POLL */

typedef struct _PRUnixPollDesc {
	PRInt32 osfd;
	PRInt16 in_flags;
	PRInt16 out_flags;
} _PRUnixPollDesc;

typedef struct PRPollQueue {
    PRCList links;        /* for linking PRPollQueue's together */
    _PRUnixPollDesc *pds;        /* array of poll descriptors */
    PRUintn npds;            /* length of the array */
    PRPackedBool on_ioq;    /* is this on the async i/o work q? */
    PRIntervalTime timeout;        /* timeout, in ticks */
    struct PRThread *thr;
} PRPollQueue;

#define _PR_POLLQUEUE_PTR(_qp) \
    ((PRPollQueue*) ((char*) (_qp) - offsetof(PRPollQueue,links)))


extern PRInt32 _PR_WaitForMultipleFDs(
    _PRUnixPollDesc *unixpds,
    PRInt32 pdcnt,
    PRIntervalTime timeout);
extern void _PR_Unblock_IO_Wait(struct PRThread *thr);

#if defined(_PR_LOCAL_THREADS_ONLY) || defined(_PR_GLOBAL_THREADS_ONLY)
#define _MD_CHECK_FOR_EXIT()
#endif

extern fd_set _pr_md_read_set, _pr_md_write_set, _pr_md_exception_set;
extern PRInt16 _pr_md_read_cnt[], _pr_md_write_cnt[], _pr_md_exception_cnt[];
extern PRInt32 _pr_md_ioq_max_osfd;
extern PRUint32 _pr_md_ioq_timeout;

struct _MDFileDesc {
    int osfd;
#if defined(LINUX) && defined(_PR_PTHREADS)
    int tcp_nodelay;  /* used by pt_LinuxSendFile */
#endif
};

struct _MDDir {
	DIR *d;
};

struct _PRCPU;
extern void _MD_unix_init_running_cpu(struct _PRCPU *cpu);

/*
** Make a redzone at both ends of the stack segment. Disallow access
** to those pages of memory. It's ok if the mprotect call's don't
** work - it just means that we don't really have a functional
** redzone.
*/
#include <sys/mman.h>
#ifndef PROT_NONE
#define PROT_NONE 0x0
#endif

#if defined(DEBUG) && !defined(DARWIN) && !defined(NEXTSTEP)
#if !defined(SOLARIS)	
#include <string.h>  /* for memset() */
#define _MD_INIT_STACK(ts,REDZONE)					\
    PR_BEGIN_MACRO                 					\
	(void) mprotect((void*)ts->seg->vaddr, REDZONE, PROT_NONE);	\
	(void) mprotect((void*) ((char*)ts->seg->vaddr + REDZONE + ts->stackSize),\
			REDZONE, PROT_NONE);				\
    /*									\
    ** Fill stack memory with something that turns into an illegal	\
    ** pointer value. This will sometimes find runtime references to	\
    ** uninitialized pointers. We don't do this for solaris because we	\
    ** can use purify instead.						\
    */									\
    if (_pr_debugStacks) {						\
	memset(ts->allocBase + REDZONE, 0xf7, ts->stackSize);		\
    }									\
    PR_END_MACRO
#else	/* !SOLARIS	*/
#define _MD_INIT_STACK(ts,REDZONE)					\
    PR_BEGIN_MACRO                 					\
	(void) mprotect((void*)ts->seg->vaddr, REDZONE, PROT_NONE);	\
	(void) mprotect((void*) ((char*)ts->seg->vaddr + REDZONE + ts->stackSize),\
			REDZONE, PROT_NONE);				\
    PR_END_MACRO
#endif	/* !SOLARIS	*/

/*
 * _MD_CLEAR_STACK
 *	Allow access to the redzone pages; the access was turned off in
 *	_MD_INIT_STACK.
 */
#define _MD_CLEAR_STACK(ts)						\
    PR_BEGIN_MACRO                 					\
	(void) mprotect((void*)ts->seg->vaddr, REDZONE, PROT_READ|PROT_WRITE);\
	(void) mprotect((void*) ((char*)ts->seg->vaddr + REDZONE + ts->stackSize),\
			REDZONE, PROT_READ|PROT_WRITE);			\
    PR_END_MACRO

#else	/* DEBUG */

#define _MD_INIT_STACK(ts,REDZONE)
#define _MD_CLEAR_STACK(ts)

#endif	/* DEBUG */

#if !defined(SOLARIS) 

#define PR_SET_INTSOFF(newval)

#endif

/************************************************************************/

extern void _PR_UnixInit(void);

/************************************************************************/

struct _MDProcess {
    pid_t pid;
};

struct PRProcess;
struct PRProcessAttr;

/* Create a new process (fork() + exec()) */
#define _MD_CREATE_PROCESS _MD_CreateUnixProcess
extern struct PRProcess * _MD_CreateUnixProcess(
    const char *path,
    char *const *argv,
    char *const *envp,
    const struct PRProcessAttr *attr
);

#define _MD_DETACH_PROCESS _MD_DetachUnixProcess
extern PRStatus _MD_DetachUnixProcess(struct PRProcess *process);

/* Wait for a child process to terminate */
#define _MD_WAIT_PROCESS _MD_WaitUnixProcess
extern PRStatus _MD_WaitUnixProcess(struct PRProcess *process,
    PRInt32 *exitCode);

#define _MD_KILL_PROCESS _MD_KillUnixProcess
extern PRStatus _MD_KillUnixProcess(struct PRProcess *process);

/************************************************************************/

extern void _MD_EnableClockInterrupts(void);
extern void _MD_DisableClockInterrupts(void);

#define _MD_START_INTERRUPTS			_MD_StartInterrupts
#define _MD_STOP_INTERRUPTS				_MD_StopInterrupts
#define _MD_DISABLE_CLOCK_INTERRUPTS	_MD_DisableClockInterrupts
#define _MD_ENABLE_CLOCK_INTERRUPTS		_MD_EnableClockInterrupts
#define _MD_BLOCK_CLOCK_INTERRUPTS		_MD_BlockClockInterrupts
#define _MD_UNBLOCK_CLOCK_INTERRUPTS	_MD_UnblockClockInterrupts

/************************************************************************/

extern void		_MD_InitCPUS(void);
#define _MD_INIT_CPUS           _MD_InitCPUS

extern void		_MD_Wakeup_CPUs(void);
#define _MD_WAKEUP_CPUS _MD_Wakeup_CPUs

#define _MD_PAUSE_CPU			_MD_PauseCPU

#if defined(_PR_LOCAL_THREADS_ONLY) || defined(_PR_GLOBAL_THREADS_ONLY)
#define _MD_CLEANUP_BEFORE_EXIT()
#endif

#ifndef IRIX
#define _MD_EXIT(status)		_exit(status)
#endif

/************************************************************************/

#define _MD_GET_ENV				getenv
#define _MD_PUT_ENV				putenv

/************************************************************************/

#define _MD_INIT_FILEDESC(fd)

extern void		_MD_MakeNonblock(PRFileDesc *fd);
#define _MD_MAKE_NONBLOCK			_MD_MakeNonblock		

/************************************************************************/

#if !defined(_PR_PTHREADS)

extern void		_MD_InitSegs(void);
extern PRStatus	_MD_AllocSegment(PRSegment *seg, PRUint32 size,
				void *vaddr);
extern void		_MD_FreeSegment(PRSegment *seg);

#define _MD_INIT_SEGS			_MD_InitSegs
#define _MD_ALLOC_SEGMENT		_MD_AllocSegment
#define _MD_FREE_SEGMENT		_MD_FreeSegment

#endif /* !defined(_PR_PTHREADS) */

/************************************************************************/