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Sweden-Number/scheduler/sysdeps.c

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/*
* 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>
#include <sys/time.h>
#include <sys/resource.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 "wine/port.h"
#include "thread.h"
#include "server.h"
#include "winbase.h"
#include "wine/exception.h"
#include "debugtools.h"
DEFAULT_DEBUG_CHANNEL(thread);
/* Xlib critical section (FIXME: does not belong here) */
CRITICAL_SECTION X11DRV_CritSection = CRITICAL_SECTION_INIT;
#ifdef linux
# 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
# endif /* CLONE_VM */
#endif /* linux */
static int init_done;
#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
#ifdef HAVE__THR_ERRNO
int *__thr_errno()
#endif
{
if (!init_done) return perrno;
#ifdef NO_REENTRANT_X11
/* Use static libc errno while running in Xlib. */
if (X11DRV_CritSection.OwningThread == GetCurrentThreadId())
return perrno;
#endif
return &NtCurrentTeb()->thread_errno;
}
/***********************************************************************
* __h_errno_location
*
* Get the per-thread h_errno location.
*/
int *__h_errno_location()
{
if (!init_done) return ph_errno;
#ifdef NO_REENTRANT_X11
/* Use static libc h_errno while running in Xlib. */
if (X11DRV_CritSection.OwningThread == GetCurrentThreadId())
return ph_errno;
#endif
return &NtCurrentTeb()->thread_h_errno;
}
#endif /* NO_REENTRANT_LIBC */
/***********************************************************************
* SYSDEPS_SetCurThread
*
* Make 'thread' the current thread.
*/
void SYSDEPS_SetCurThread( TEB *teb )
{
#if defined(__i386__)
/* On the i386, the current thread is in the %fs register */
__set_fs( teb->teb_sel );
#elif defined(HAVE__LWP_CREATE)
/* On non-i386 Solaris, we use the LWP private pointer */
_lwp_setprivate( teb );
#endif
init_done = 1; /* now we can use threading routines */
}
/***********************************************************************
* SYSDEPS_StartThread
*
* Startup routine for a new thread.
*/
static void SYSDEPS_StartThread( TEB *teb )
{
SYSDEPS_SetCurThread( teb );
CLIENT_InitThread();
SIGNAL_Init();
__TRY
{
teb->startup();
}
__EXCEPT(UnhandledExceptionFilter)
{
TerminateThread( GetCurrentThread(), GetExceptionCode() );
}
__ENDTRY
SYSDEPS_ExitThread(0); /* should never get here */
}
/***********************************************************************
* SYSDEPS_SpawnThread
*
* Start running a new thread.
* Return -1 on error, 0 if OK.
*/
int SYSDEPS_SpawnThread( TEB *teb )
{
#ifndef NO_REENTRANT_LIBC
#ifdef linux
const int flags = CLONE_VM | CLONE_FS | CLONE_FILES | SIGCHLD;
if (clone( (int (*)(void *))SYSDEPS_StartThread, teb->stack_top, flags, teb ) < 0)
return -1;
if (!(flags & CLONE_FILES)) close( teb->socket ); /* close the child socket in the parent */
return 0;
#endif
#ifdef HAVE_RFORK
const int flags = RFPROC | RFMEM; /*|RFFDG*/
void **sp = (void **)teb->stack_top;
*--sp = teb;
*--sp = 0;
*--sp = SYSDEPS_StartThread;
__asm__ __volatile__(
"pushl %2;\n\t" /* flags */
"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" /* child -> new thread */
"ret;\n"
"1:\n\t" /* parent -> caller thread */
"addl $8,%%esp" :
: "r" (sp), "g" (SYS_rfork), "g" (flags)
: "eax", "edx");
if (flags & RFFDG) close( teb->socket ); /* close the child socket in the parent */
return 0;
#endif
#ifdef HAVE__LWP_CREATE
ucontext_t context;
_lwp_makecontext( &context, (void(*)(void *))SYSDEPS_StartThread, teb,
NULL, teb->stack_base, (char *)teb->stack_top - (char *)teb->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.
*/
void SYSDEPS_ExitThread( int status )
{
int socket = NtCurrentTeb()->socket;
NtCurrentTeb()->socket = -1;
close( socket );
#ifdef HAVE__LWP_CREATE
_lwp_exit();
#endif
_exit( status );
/*
* It is of course impossible to come here,
* but it eliminates a compiler warning.
*/
exit( status );
}
/***********************************************************************
* SYSDEPS_CallOnStack
*/
int SYSDEPS_DoCallOnStack( int (*func)(LPVOID), LPVOID arg )
{
int retv = 0;
__TRY
{
retv = func( arg );
}
__EXCEPT(UnhandledExceptionFilter)
{
TerminateThread( GetCurrentThread(), GetExceptionCode() );
return 0;
}
__ENDTRY
return retv;
}
#ifdef __i386__
int SYSDEPS_CallOnStack( LPVOID stackTop, LPVOID stackLow,
int (*func)(LPVOID), LPVOID arg );
__ASM_GLOBAL_FUNC( SYSDEPS_CallOnStack,
"pushl %ebp\n\t"
"movl %esp, %ebp\n\t"
".byte 0x64; pushl 0x04\n\t"
".byte 0x64; pushl 0x08\n\t"
"movl 8(%ebp), %esp\n\t"
"movl 12(%ebp), %eax\n\t"
".byte 0x64; movl %esp, 0x04\n\t"
".byte 0x64; movl %eax, 0x08\n\t"
"pushl 20(%ebp)\n\t"
"pushl 16(%ebp)\n\t"
"call " __ASM_NAME("SYSDEPS_DoCallOnStack") "\n\t"
"leal -8(%ebp), %esp\n\t"
".byte 0x64; popl 0x08\n\t"
".byte 0x64; popl 0x04\n\t"
"popl %ebp\n\t"
"ret" );
#else
int SYSDEPS_CallOnStack( LPVOID stackTop, LPVOID stackLow,
int (*func)(LPVOID), LPVOID arg )
{
return SYSDEPS_DoCallOnStack( func, arg );
}
#endif
/***********************************************************************
* SYSDEPS_SwitchToThreadStack
*/
static LPVOID SYSDEPS_LargeStackTop = NULL;
static LPVOID SYSDEPS_LargeStackLow = NULL;
void SYSDEPS_SwitchToThreadStack( void (*func)(void) )
{
DWORD page_size = getpagesize();
DWORD cur_stack = (((DWORD)&func) + (page_size-1)) & ~(page_size-1);
TEB *teb = NtCurrentTeb();
LPVOID stackTop = teb->stack_top;
LPVOID stackLow = teb->stack_low;
struct rlimit rl;
if ( getrlimit(RLIMIT_STACK, &rl) < 0 )
{
WARN("Can't get rlimit\n");
rl.rlim_cur = 8*1024*1024;
}
teb->stack_top = (LPVOID) cur_stack;
teb->stack_low = (LPVOID)(cur_stack - rl.rlim_cur);
#if 0
SYSDEPS_LargeStackTop = (LPVOID)(cur_stack - 2*page_size);
SYSDEPS_LargeStackLow = (LPVOID)(cur_stack - rl.rlim_cur);
#endif
SYSDEPS_CallOnStack( stackTop, stackLow,
(int (*)(void *))func, NULL );
}
/***********************************************************************
* SYSDEPS_CallOnLargeStack
*/
int SYSDEPS_CallOnLargeStack( int (*func)(LPVOID), LPVOID arg )
{
static int recurse = 0;
int retv;
if ( recurse++ == 0 && SYSDEPS_LargeStackTop )
retv = SYSDEPS_CallOnStack( SYSDEPS_LargeStackTop,
SYSDEPS_LargeStackLow, func, arg );
else
retv = func( arg );
recurse--;
return retv;
}
/**********************************************************************
* NtCurrentTeb (NTDLL.89)
*
* This will crash and burn if called before threading is initialized
*/
#ifdef __i386__
__ASM_GLOBAL_FUNC( NtCurrentTeb, ".byte 0x64\n\tmovl 0x18,%eax\n\tret" );
#elif defined(HAVE__LWP_CREATE)
struct _TEB * WINAPI NtCurrentTeb(void)
{
extern void *_lwp_getprivate(void);
return (struct _TEB *)_lwp_getprivate();
}
#else
# error NtCurrentTeb not defined for this architecture
#endif /* __i386__ */
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