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 "selectors.h"
  31 #include "server.h"
  32 #include "winbase.h"
  33 #include "wine/exception.h"
  34 #include "debugtools.h"
  35
  36 DEFAULT_DEBUG_CHANNEL(thread)
  37
  38 /* Xlib critical section (FIXME: does not belong here) */
  39 CRITICAL_SECTION X11DRV_CritSection = CRITICAL_SECTION_INIT;
  40
  41 #ifdef linux
  42 # ifdef HAVE_SCHED_H
  43 #  include <sched.h>
  44 # endif
  45 # ifndef CLONE_VM
  46 #  define CLONE_VM      0x00000100
  47 #  define CLONE_FS      0x00000200
  48 #  define CLONE_FILES   0x00000400
  49 #  define CLONE_SIGHAND 0x00000800
  50 #  define CLONE_PID     0x00001000
  51 # endif  /* CLONE_VM */
  52 #endif  /* linux */
  53
  54 static int init_done;
  55
  56 #ifndef NO_REENTRANT_LIBC
  57
  58 /***********************************************************************
  59  *           __errno_location/__error/___errno
  60  *
  61  * Get the per-thread errno location.
  62  */
  63 #ifdef HAVE__ERRNO_LOCATION
  64 int *__errno_location()
  65 #endif
  66 #ifdef HAVE__ERROR
  67 int *__error()
  68 #endif
  69 #ifdef HAVE___ERRNO
  70 int *___errno()
  71 #endif
  72 #ifdef HAVE__THR_ERRNO
  73 int *__thr_errno()
  74 #endif
  75 {
  76     if (!init_done) return perrno;
  77 #ifdef NO_REENTRANT_X11
  78     /* Use static libc errno while running in Xlib. */
  79     if (X11DRV_CritSection.OwningThread == GetCurrentThreadId())
  80         return perrno;
  81 #endif
  82     return &NtCurrentTeb()->thread_errno;
  83 }
  84
  85 /***********************************************************************
  86  *           __h_errno_location
  87  *
  88  * Get the per-thread h_errno location.
  89  */
  90 int *__h_errno_location()
  91 {
  92     if (!init_done) return ph_errno;
  93 #ifdef NO_REENTRANT_X11
  94     /* Use static libc h_errno while running in Xlib. */
  95     if (X11DRV_CritSection.OwningThread == GetCurrentThreadId())
  96         return ph_errno;
  97 #endif
  98     return &NtCurrentTeb()->thread_h_errno;
  99 }
 100
 101 #endif /* NO_REENTRANT_LIBC */
 102
 103 /***********************************************************************
 104  *           SYSDEPS_SetCurThread
 105  *
 106  * Make 'thread' the current thread.
 107  */
 108 void SYSDEPS_SetCurThread( TEB *teb )
 109 {
 110 #if defined(__i386__)
 111     /* On the i386, the current thread is in the %fs register */
 112     __set_fs( teb->teb_sel );
 113 #elif defined(HAVE__LWP_CREATE)
 114     /* On non-i386 Solaris, we use the LWP private pointer */
 115     _lwp_setprivate( teb );
 116 #endif
 117
 118     init_done = 1;  /* now we can use threading routines */
 119 }
 120
 121 /***********************************************************************
 122  *           SYSDEPS_StartThread
 123  *
 124  * Startup routine for a new thread.
 125  */
 126 static void SYSDEPS_StartThread( TEB *teb )
 127 {
 128     SYSDEPS_SetCurThread( teb );
 129     CLIENT_InitThread();
 130     SIGNAL_Init();
 131     __TRY
 132     {
 133         teb->startup();
 134     }
 135     __EXCEPT(UnhandledExceptionFilter)
 136     {
 137         TerminateThread( GetCurrentThread(), GetExceptionCode() );
 138     }
 139     __ENDTRY
 140     SYSDEPS_ExitThread(0);  /* should never get here */
 141 }
 142
 143
 144 /***********************************************************************
 145  *           SYSDEPS_SpawnThread
 146  *
 147  * Start running a new thread.
 148  * Return -1 on error, 0 if OK.
 149  */
 150 int SYSDEPS_SpawnThread( TEB *teb )
 151 {
 152 #ifndef NO_REENTRANT_LIBC
 153
 154 #ifdef linux
 155     const int flags = CLONE_VM | CLONE_FS | CLONE_FILES | SIGCHLD;
 156     if (clone( (int (*)(void *))SYSDEPS_StartThread, teb->stack_top, flags, teb ) < 0)
 157         return -1;
 158     if (!(flags & CLONE_FILES)) close( teb->socket );  /* close the child socket in the parent */
 159     return 0;
 160 #endif
 161
 162 #ifdef HAVE_RFORK
 163     const int flags = RFPROC | RFMEM; /*|RFFDG*/
 164     void **sp = (void **)teb->stack_top;
 165     *--sp = teb;
 166     *--sp = 0;
 167     *--sp = SYSDEPS_StartThread;
 168     __asm__ __volatile__(
 169     "pushl %2;\n\t"             /* flags */
 170     "pushl $0;\n\t"             /* 0 ? */
 171     "movl %1,%%eax;\n\t"        /* SYS_rfork */
 172     ".byte 0x9a; .long 0; .word 7;\n\t" /* lcall 7:0... FreeBSD syscall */
 173     "cmpl $0, %%edx;\n\t"
 174     "je 1f;\n\t"
 175     "movl %0,%%esp;\n\t"        /* child -> new thread */
 176     "ret;\n"
 177     "1:\n\t"            /* parent -> caller thread */
 178     "addl $8,%%esp" :
 179     : "r" (sp), "g" (SYS_rfork), "g" (flags)
 180     : "eax", "edx");
 181     if (flags & RFFDG) close( teb->socket );  /* close the child socket in the parent */
 182     return 0;
 183 #endif
 184
 185 #ifdef HAVE__LWP_CREATE
 186     ucontext_t context;
 187     _lwp_makecontext( &context, (void(*)(void *))SYSDEPS_StartThread, teb,
 188                       NULL, teb->stack_base, (char *)teb->stack_top - (char *)teb->stack_base );
 189     if ( _lwp_create( &context, 0, NULL ) )
 190         return -1;
 191     return 0;
 192 #endif
 193
 194 #endif /* NO_REENTRANT_LIBC */
 195
 196     FIXME("CreateThread: stub\n" );
 197     return 0;
 198 }
 199
 200
 201
 202 /***********************************************************************
 203  *           SYSDEPS_ExitThread
 204  *
 205  * Exit a running thread; must not return.
 206  */
 207 void SYSDEPS_ExitThread( int status )
 208 {
 209     int socket = NtCurrentTeb()->socket;
 210     NtCurrentTeb()->socket = -1;
 211     close( socket );
 212 #ifdef HAVE__LWP_CREATE
 213     _lwp_exit();
 214 #endif
 215     _exit( status );
 216     /*
 217      * It is of course impossible to come here,
 218      * but it eliminates a compiler warning.
 219      */
 220     exit( status );
 221 }
 222
 223
 224 /**********************************************************************
 225  *           NtCurrentTeb   (NTDLL.89)
 226  *
 227  * This will crash and burn if called before threading is initialized
 228  */
 229 #ifdef __i386__
 230 __ASM_GLOBAL_FUNC( NtCurrentTeb, ".byte 0x64\n\tmovl 0x18,%eax\n\tret" );
 231 #elif defined(HAVE__LWP_CREATE)
 232 struct _TEB * WINAPI NtCurrentTeb(void)
 233 {
 234     extern void *_lwp_getprivate(void);
 235     return (struct _TEB *)_lwp_getprivate();
 236 }
 237 #else
 238 # error NtCurrentTeb not defined for this architecture
 239 #endif  /* __i386__ */