Sweden-Number/scheduler/sysdeps.c

151 lines
3.8 KiB
C

/*
* System-dependent scheduler support
*
* Copyright 1998 Alexandre Julliard
*/
/* Get pointers to the static errno and h_errno variables used by Xlib. This
must be done before including <errno.h> makes the variables invisible. */
extern int errno;
static int *perrno = &errno;
extern int h_errno;
static int *ph_errno = &h_errno;
#include <signal.h>
#include <stdio.h>
#include <unistd.h>
#include "thread.h"
#include "server.h"
#include "winbase.h"
#include "debug.h"
/* Xlib critical section (FIXME: does not belong here) */
CRITICAL_SECTION X11DRV_CritSection = { 0, };
#ifdef HAVE_CLONE_SYSCALL
# ifdef HAVE_SCHED_H
# include <sched.h>
# endif
# ifndef CLONE_VM
# define CLONE_VM 0x00000100
# define CLONE_FS 0x00000200
# define CLONE_FILES 0x00000400
# define CLONE_SIGHAND 0x00000800
# define CLONE_PID 0x00001000
/* If we didn't get the flags, we probably didn't get the prototype either */
extern int clone( int (*fn)(void *arg), void *stack, int flags, void *arg );
# endif /* CLONE_VM */
#endif /* HAVE_CLONE_SYSCALL */
#ifdef USE_THREADS
/***********************************************************************
* __errno_location
*
* Get the per-thread errno location.
*/
int *__errno_location()
{
THDB *thdb = THREAD_Current();
if (!thdb) return perrno;
#ifdef NO_REENTRANT_X11
/* Use static libc errno while running in Xlib. */
if (X11DRV_CritSection.OwningThread == (HANDLE)thdb->server_tid)
return perrno;
#endif
return &thdb->thread_errno;
}
/***********************************************************************
* __h_errno_location
*
* Get the per-thread h_errno location.
*/
int *__h_errno_location()
{
THDB *thdb = THREAD_Current();
if (!thdb) return ph_errno;
#ifdef NO_REENTRANT_X11
/* Use static libc h_errno while running in Xlib. */
if (X11DRV_CritSection.OwningThread == (HANDLE)thdb->server_tid)
return ph_errno;
#endif
return &thdb->thread_h_errno;
}
/***********************************************************************
* SYSDEPS_StartThread
*
* Startup routine for a new thread.
*/
static void SYSDEPS_StartThread( THDB *thdb )
{
SET_CUR_THREAD( thdb );
CLIENT_InitThread();
thdb->startup();
_exit(0); /* should never get here */
}
#endif /* USE_THREADS */
/***********************************************************************
* SYSDEPS_SpawnThread
*
* Start running a new thread.
* Return -1 on error, 0 if OK.
*/
int SYSDEPS_SpawnThread( THDB *thread )
{
#ifdef USE_THREADS
#ifdef HAVE_CLONE_SYSCALL
if (clone( (int (*)(void *))SYSDEPS_StartThread, thread->teb.stack_top,
CLONE_VM | CLONE_FS | CLONE_FILES | SIGCHLD, thread ) < 0)
return -1;
/* FIXME: close the child socket in the parent process */
/* close( thread->socket );*/
#endif
#ifdef HAVE_RFORK
FIXME(thread, "Threads using rfork() not implemented\n" );
#endif
#else /* !USE_THREADS */
FIXME(thread, "CreateThread: stub\n" );
#endif /* USE_THREADS */
return 0;
}
/***********************************************************************
* SYSDEPS_ExitThread
*
* Exit a running thread; must not return.
* Must not make any reference to the thread structures (THDB etc.) as
* they have already been deleted.
*/
void SYSDEPS_ExitThread(void)
{
_exit( 0 );
}
/**********************************************************************
* NtCurrentTeb (NTDLL.89)
*
* This will crash and burn if called before threading is initialized
*/
TEB * WINAPI NtCurrentTeb(void)
{
#ifdef __i386__
TEB *teb;
/* Get the TEB self-pointer */
__asm__( ".byte 0x64\n\tmovl (%1),%0"
: "=r" (teb) : "r" (&((TEB *)0)->self) );
return teb;
#else
return &pCurrentThread->teb;
#endif /* __i386__ */
}