scheduler/sysdeps.c

   1 /*
   2  * System-dependent scheduler support
   3  *
   4  * Copyright 1998 Alexandre Julliard
   5  */
   6
   7 #include "config.h"
   8
   9 /* Get pointers to the static errno and h_errno variables used by Xlib. This
  10    must be done before including <errno.h> makes the variables invisible.  */
  11 extern int errno;
  12 static int *perrno = &errno;
  13 extern int h_errno;
  14 static int *ph_errno = &h_errno;
  15
  16 #include <signal.h>
  17 #include <stdio.h>
  18 #include <unistd.h>
  19 #ifdef HAVE_SYS_SYSCALL_H
  20 # include <sys/syscall.h>
  21 #endif
  22 #ifdef HAVE_SYS_LWP_H
  23 # include <sys/lwp.h>
  24 #endif
  25 #ifdef HAVE_UCONTEXT_H
  26 # include <ucontext.h>
  27 #endif
  28 #include "wine/port.h"
  29 #include "thread.h"
  30 #include "server.h"
  31 #include "winbase.h"
  32 #include "wine/exception.h"
  33 #include "debugtools.h"
  34
  35 DEFAULT_DEBUG_CHANNEL(thread)
  36
  37 /* Xlib critical section (FIXME: does not belong here) */
  38 CRITICAL_SECTION X11DRV_CritSection = { 0, };
  39
  40 #ifdef linux
  41 # ifdef HAVE_SCHED_H
  42 #  include <sched.h>
  43 # endif
  44 # ifndef CLONE_VM
  45 #  define CLONE_VM      0x00000100
  46 #  define CLONE_FS      0x00000200
  47 #  define CLONE_FILES   0x00000400
  48 #  define CLONE_SIGHAND 0x00000800
  49 #  define CLONE_PID     0x00001000
  50 # endif  /* CLONE_VM */
  51 #endif  /* linux */
  52
  53 static int init_done;
  54
  55 #ifndef NO_REENTRANT_LIBC
  56
  57 /***********************************************************************
  58  *           __errno_location/__error/___errno
  59  *
  60  * Get the per-thread errno location.
  61  */
  62 #ifdef HAVE__ERRNO_LOCATION
  63 int *__errno_location()
  64 #endif
  65 #ifdef HAVE__ERROR
  66 int *__error()
  67 #endif
  68 #ifdef HAVE___ERRNO
  69 int *___errno()
  70 #endif
  71 #ifdef HAVE__THR_ERRNO
  72 int *__thr_errno()
  73 #endif
  74 {
  75     if (!init_done) return perrno;
  76 #ifdef NO_REENTRANT_X11
  77     /* Use static libc errno while running in Xlib. */
  78     if (X11DRV_CritSection.OwningThread == GetCurrentThreadId())
  79         return perrno;
  80 #endif
  81     return &NtCurrentTeb()->thread_errno;
  82 }
  83
  84 /***********************************************************************
  85  *           __h_errno_location
  86  *
  87  * Get the per-thread h_errno location.
  88  */
  89 int *__h_errno_location()
  90 {
  91     if (!init_done) return ph_errno;
  92 #ifdef NO_REENTRANT_X11
  93     /* Use static libc h_errno while running in Xlib. */
  94     if (X11DRV_CritSection.OwningThread == GetCurrentThreadId())
  95         return ph_errno;
  96 #endif
  97     return &NtCurrentTeb()->thread_h_errno;
  98 }
  99
 100 #endif /* NO_REENTRANT_LIBC */
 101
 102 /***********************************************************************
 103  *           SYSDEPS_SetCurThread
 104  *
 105  * Make 'thread' the current thread.
 106  */
 107 void SYSDEPS_SetCurThread( TEB *teb )
 108 {
 109 #if defined(__i386__)
 110     /* On the i386, the current thread is in the %fs register */
 111     SET_FS( teb->teb_sel );
 112 #elif defined(HAVE__LWP_CREATE)
 113     /* On non-i386 Solaris, we use the LWP private pointer */
 114     _lwp_setprivate( teb );
 115 #endif
 116
 117     init_done = 1;  /* now we can use threading routines */
 118 }
 119
 120 /***********************************************************************
 121  *           SYSDEPS_StartThread
 122  *
 123  * Startup routine for a new thread.
 124  */
 125 static void SYSDEPS_StartThread( TEB *teb )
 126 {
 127     SYSDEPS_SetCurThread( teb );
 128     CLIENT_InitThread();
 129     SIGNAL_Init();
 130     __TRY
 131     {
 132         teb->startup();
 133     }
 134     __EXCEPT(UnhandledExceptionFilter)
 135     {
 136         TerminateThread( GetCurrentThread(), GetExceptionCode() );
 137     }
 138     __ENDTRY
 139     SYSDEPS_ExitThread();  /* should never get here */
 140 }
 141
 142
 143 /***********************************************************************
 144  *           SYSDEPS_SpawnThread
 145  *
 146  * Start running a new thread.
 147  * Return -1 on error, 0 if OK.
 148  */
 149 int SYSDEPS_SpawnThread( TEB *teb )
 150 {
 151 #ifndef NO_REENTRANT_LIBC
 152
 153 #ifdef linux
 154     if (clone( (int (*)(void *))SYSDEPS_StartThread, teb->stack_top,
 155                CLONE_VM | CLONE_FS | CLONE_FILES | SIGCHLD, teb ) < 0)
 156         return -1;
 157     /* FIXME: close the child socket in the parent process */
 158 /*    close( thread->socket );*/
 159     return 0;
 160 #endif
 161
 162 #ifdef HAVE_RFORK
 163     DWORD *sp = (DWORD *)teb->stack_top;
 164     *--sp = (DWORD)teb;
 165     *--sp = 0;
 166     *--sp = (DWORD)SYSDEPS_StartThread;
 167     __asm__(
 168     "pushl %2;\n\t"             /* RFPROC|RMEM */
 169     "pushl $0;\n\t"             /* 0 ? */
 170     "movl %1,%%eax;\n\t"        /* SYS_rfork */
 171     ".byte 0x9a; .long 0; .word 7;\n\t" /* lcall 7:0... FreeBSD syscall */
 172     "cmpl $0, %%edx;\n\t"
 173     "je 1f;\n\t"
 174     "movl %0,%%esp;\n\t"        /* father -> new thread */
 175     "ret;\n"
 176     "1:\n\t"            /* child -> caller thread */
 177     "addl $8,%%esp" :
 178     : "r" (sp), "g" (SYS_rfork), "g" (RFPROC|RFMEM)
 179     : "eax", "edx");
 180     return 0;
 181 #endif
 182
 183 #ifdef HAVE__LWP_CREATE
 184     ucontext_t context;
 185     _lwp_makecontext( &context, (void(*)(void *))SYSDEPS_StartThread, teb,
 186                       NULL, teb->stack_base, (char *)teb->stack_top - (char *)teb->stack_base );
 187     if ( _lwp_create( &context, 0, NULL ) )
 188         return -1;
 189     return 0;
 190 #endif
 191
 192 #endif /* NO_REENTRANT_LIBC */
 193
 194     FIXME("CreateThread: stub\n" );
 195     return 0;
 196 }
 197
 198
 199
 200 /***********************************************************************
 201  *           SYSDEPS_ExitThread
 202  *
 203  * Exit a running thread; must not return.
 204  * Must not make any reference to the thread structures (THDB etc.) as
 205  * they have already been deleted.
 206  */
 207 void SYSDEPS_ExitThread(void)
 208 {
 209 #ifdef HAVE__LWP_CREATE
 210     _lwp_exit();
 211 #endif
 212
 213     _exit( 0 );
 214 }
 215
 216
 217 /**********************************************************************
 218  *           NtCurrentTeb   (NTDLL.89)
 219  *
 220  * This will crash and burn if called before threading is initialized
 221  */
 222
 223 /* if it was defined as a macro, we need to do some magic */
 224 #ifdef NtCurrentTeb
 225 #undef NtCurrentTeb
 226 #endif
 227
 228 struct _TEB * WINAPI NtCurrentTeb(void)
 229 {
 230     return __get_teb();
 231 }
 232