Sweden-Number/scheduler/sysdeps.c

230 lines
5.5 KiB
C

/*
* System-dependent scheduler support
*
* Copyright 1998 Alexandre Julliard
*/
#include "config.h"
/* 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>
#ifdef HAVE_SYS_SYSCALL_H
# include <sys/syscall.h>
#endif
#ifdef HAVE_SYS_LWP_H
# include <sys/lwp.h>
#endif
#ifdef HAVE_UCONTEXT_H
# include <ucontext.h>
#endif
#include "thread.h"
#include "server.h"
#include "winbase.h"
#include "debugtools.h"
DEFAULT_DEBUG_CHANNEL(thread)
#ifdef linux
#define HAVE_CLONE_SYSCALL
#endif
/* 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 */
static int init_done;
#ifndef __i386__
static THDB *pCurrentThread;
#endif
#ifndef NO_REENTRANT_LIBC
/***********************************************************************
* __errno_location/__error/___errno
*
* Get the per-thread errno location.
*/
#ifdef HAVE__ERRNO_LOCATION
int *__errno_location()
#endif
#ifdef HAVE__ERROR
int *__error()
#endif
#ifdef HAVE___ERRNO
int *___errno()
#endif
{
THDB *thdb;
if (!init_done) return perrno;
thdb = THREAD_Current();
#ifdef NO_REENTRANT_X11
/* Use static libc errno while running in Xlib. */
if (X11DRV_CritSection.OwningThread == (HANDLE)thdb->teb.tid)
return perrno;
#endif
return &thdb->thread_errno;
}
/***********************************************************************
* __h_errno_location
*
* Get the per-thread h_errno location.
*/
int *__h_errno_location()
{
THDB *thdb;
if (!init_done) return ph_errno;
thdb = THREAD_Current();
#ifdef NO_REENTRANT_X11
/* Use static libc h_errno while running in Xlib. */
if (X11DRV_CritSection.OwningThread == (HANDLE)thdb->teb.tid)
return ph_errno;
#endif
return &thdb->thread_h_errno;
}
#endif /* NO_REENTRANT_LIBC */
/***********************************************************************
* SYSDEPS_SetCurThread
*
* Make 'thread' the current thread.
*/
void SYSDEPS_SetCurThread( THDB *thread )
{
#ifdef __i386__
/* On the i386, the current thread is in the %fs register */
SET_FS( thread->teb_sel );
#else
/* FIXME: only works if there is no preemptive task-switching going on... */
pCurrentThread = thread;
#endif /* __i386__ */
init_done = 1; /* now we can use threading routines */
}
/***********************************************************************
* SYSDEPS_StartThread
*
* Startup routine for a new thread.
*/
static void SYSDEPS_StartThread( THDB *thdb )
{
SYSDEPS_SetCurThread( thdb );
CLIENT_InitThread();
thdb->startup();
SYSDEPS_ExitThread(); /* should never get here */
}
/***********************************************************************
* SYSDEPS_SpawnThread
*
* Start running a new thread.
* Return -1 on error, 0 if OK.
*/
int SYSDEPS_SpawnThread( THDB *thread )
{
#ifndef NO_REENTRANT_LIBC
#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 );*/
return 0;
#endif
#ifdef HAVE_RFORK
DWORD *sp = (DWORD *)thread->teb.stack_top;
*--sp = (DWORD)thread;
*--sp = 0;
*--sp = (DWORD)SYSDEPS_StartThread;
__asm__(
"pushl %2;\n\t" /* RFPROC|RMEM */
"pushl $0;\n\t" /* 0 ? */
"movl %1,%%eax;\n\t" /* SYS_rfork */
".byte 0x9a; .long 0; .word 7;\n\t" /* lcall 7:0... FreeBSD syscall */
"cmpl $0, %%edx;\n\t"
"je 1f;\n\t"
"movl %0,%%esp;\n\t" /* father -> new thread */
"ret;\n"
"1:\n\t" /* child -> caller thread */
"addl $8,%%esp" :
: "r" (sp), "g" (SYS_rfork), "g" (RFPROC|RFMEM)
: "eax", "edx");
return 0;
#endif
#ifdef HAVE__LWP_CREATE
ucontext_t context;
_lwp_makecontext( &context, (void(*)(void *))SYSDEPS_StartThread, thread,
NULL, thread->stack_base, (char *) thread->teb.stack_top - (char *) thread->stack_base );
if ( _lwp_create( &context, 0, NULL ) )
return -1;
return 0;
#endif
#endif /* NO_REENTRANT_LIBC */
FIXME("CreateThread: stub\n" );
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)
{
#ifdef HAVE__LWP_CREATE
_lwp_exit();
#endif
_exit( 0 );
}
/**********************************************************************
* NtCurrentTeb (NTDLL.89)
*
* This will crash and burn if called before threading is initialized
*/
TEB * WINAPI NtCurrentTeb(void)
{
#ifdef __i386__
return CURRENT();
#else
return &pCurrentThread->teb;
#endif /* __i386__ */
}