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 "thread.h"
  29 #include "server.h"
  30 #include "winbase.h"
  31 #include "wine/exception.h"
  32 #include "debugtools.h"
  33
  34 DEFAULT_DEBUG_CHANNEL(thread)
  35
  36 #ifdef linux
  37 #define HAVE_CLONE_SYSCALL
  38 #endif
  39
  40 /* Xlib critical section (FIXME: does not belong here) */
  41 CRITICAL_SECTION X11DRV_CritSection = { 0, };
  42
  43 #ifdef HAVE_CLONE_SYSCALL
  44 # ifdef HAVE_SCHED_H
  45 #  include <sched.h>
  46 # endif
  47 # ifndef CLONE_VM
  48 #  define CLONE_VM      0x00000100
  49 #  define CLONE_FS      0x00000200
  50 #  define CLONE_FILES   0x00000400
  51 #  define CLONE_SIGHAND 0x00000800
  52 #  define CLONE_PID     0x00001000
  53 /* If we didn't get the flags, we probably didn't get the prototype either */
  54 extern int clone( int (*fn)(void *arg), void *stack, int flags, void *arg );
  55 # endif  /* CLONE_VM */
  56 #endif  /* HAVE_CLONE_SYSCALL */
  57
  58 static int init_done;
  59
  60 #ifndef NO_REENTRANT_LIBC
  61
  62 /***********************************************************************
  63  *           __errno_location/__error/___errno
  64  *
  65  * Get the per-thread errno location.
  66  */
  67 #ifdef HAVE__ERRNO_LOCATION
  68 int *__errno_location()
  69 #endif
  70 #ifdef HAVE__ERROR
  71 int *__error()
  72 #endif
  73 #ifdef HAVE___ERRNO
  74 int *___errno()
  75 #endif
  76 #ifdef HAVE__THR_ERRNO
  77 int *__thr_errno()
  78 #endif
  79 {
  80     if (!init_done) return perrno;
  81 #ifdef NO_REENTRANT_X11
  82     /* Use static libc errno while running in Xlib. */
  83     if (X11DRV_CritSection.OwningThread == GetCurrentThreadId())
  84         return perrno;
  85 #endif
  86     return &NtCurrentTeb()->thread_errno;
  87 }
  88
  89 /***********************************************************************
  90  *           __h_errno_location
  91  *
  92  * Get the per-thread h_errno location.
  93  */
  94 int *__h_errno_location()
  95 {
  96     if (!init_done) return ph_errno;
  97 #ifdef NO_REENTRANT_X11
  98     /* Use static libc h_errno while running in Xlib. */
  99     if (X11DRV_CritSection.OwningThread == GetCurrentThreadId())
 100         return ph_errno;
 101 #endif
 102     return &NtCurrentTeb()->thread_h_errno;
 103 }
 104
 105 #endif /* NO_REENTRANT_LIBC */
 106
 107 /***********************************************************************
 108  *           SYSDEPS_SetCurThread
 109  *
 110  * Make 'thread' the current thread.
 111  */
 112 void SYSDEPS_SetCurThread( TEB *teb )
 113 {
 114 #if defined(__i386__)
 115     /* On the i386, the current thread is in the %fs register */
 116     SET_FS( teb->teb_sel );
 117 #elif defined(HAVE__LWP_CREATE)
 118     /* On non-i386 Solaris, we use the LWP private pointer */
 119     _lwp_setprivate( teb );
 120 #endif
 121
 122     init_done = 1;  /* now we can use threading routines */
 123 }
 124
 125 /***********************************************************************
 126  *           SYSDEPS_StartThread
 127  *
 128  * Startup routine for a new thread.
 129  */
 130 static void SYSDEPS_StartThread( TEB *teb )
 131 {
 132     SYSDEPS_SetCurThread( teb );
 133     CLIENT_InitThread();
 134     SIGNAL_Init();
 135     __TRY
 136     {
 137         teb->startup();
 138     }
 139     __EXCEPT(UnhandledExceptionFilter)
 140     {
 141         TerminateThread( GetCurrentThread(), GetExceptionCode() );
 142     }
 143     __ENDTRY
 144     SYSDEPS_ExitThread();  /* should never get here */
 145 }
 146
 147
 148 /***********************************************************************
 149  *           SYSDEPS_SpawnThread
 150  *
 151  * Start running a new thread.
 152  * Return -1 on error, 0 if OK.
 153  */
 154 int SYSDEPS_SpawnThread( TEB *teb )
 155 {
 156 #ifndef NO_REENTRANT_LIBC
 157
 158 #ifdef HAVE_CLONE_SYSCALL
 159     if (clone( (int (*)(void *))SYSDEPS_StartThread, teb->stack_top,
 160                CLONE_VM | CLONE_FS | CLONE_FILES | SIGCHLD, teb ) < 0)
 161         return -1;
 162     /* FIXME: close the child socket in the parent process */
 163 /*    close( thread->socket );*/
 164     return 0;
 165 #endif
 166
 167 #ifdef HAVE_RFORK
 168     DWORD *sp = (DWORD *)teb->stack_top;
 169     *--sp = (DWORD)teb;
 170     *--sp = 0;
 171     *--sp = (DWORD)SYSDEPS_StartThread;
 172     __asm__(
 173     "pushl %2;\n\t"             /* RFPROC|RMEM */
 174     "pushl $0;\n\t"             /* 0 ? */
 175     "movl %1,%%eax;\n\t"        /* SYS_rfork */
 176     ".byte 0x9a; .long 0; .word 7;\n\t" /* lcall 7:0... FreeBSD syscall */
 177     "cmpl $0, %%edx;\n\t"
 178     "je 1f;\n\t"
 179     "movl %0,%%esp;\n\t"        /* father -> new thread */
 180     "ret;\n"
 181     "1:\n\t"            /* child -> caller thread */
 182     "addl $8,%%esp" :
 183     : "r" (sp), "g" (SYS_rfork), "g" (RFPROC|RFMEM)
 184     : "eax", "edx");
 185     return 0;
 186 #endif
 187
 188 #ifdef HAVE__LWP_CREATE
 189     ucontext_t context;
 190     _lwp_makecontext( &context, (void(*)(void *))SYSDEPS_StartThread, teb,
 191                       NULL, teb->stack_base, (char *)teb->stack_top - (char *)teb->stack_base );
 192     if ( _lwp_create( &context, 0, NULL ) )
 193         return -1;
 194     return 0;
 195 #endif
 196
 197 #endif /* NO_REENTRANT_LIBC */
 198
 199     FIXME("CreateThread: stub\n" );
 200     return 0;
 201 }
 202
 203
 204
 205 /***********************************************************************
 206  *           SYSDEPS_ExitThread
 207  *
 208  * Exit a running thread; must not return.
 209  * Must not make any reference to the thread structures (THDB etc.) as
 210  * they have already been deleted.
 211  */
 212 void SYSDEPS_ExitThread(void)
 213 {
 214 #ifdef HAVE__LWP_CREATE
 215     _lwp_exit();
 216 #endif
 217
 218     _exit( 0 );
 219 }
 220
 221
 222 /**********************************************************************
 223  *           NtCurrentTeb   (NTDLL.89)
 224  *
 225  * This will crash and burn if called before threading is initialized
 226  */
 227
 228 /* if it was defined as a macro, we need to do some magic */
 229 #ifdef NtCurrentTeb
 230 #undef NtCurrentTeb
 231 #endif
 232
 233 struct _TEB * WINAPI NtCurrentTeb(void)
 234 {
 235     return __get_teb();
 236 }
 237