scheduler/sysdeps.c

   1 /*
   2  * System-dependent scheduler support
   3  *
   4  * Copyright 1998 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <signal.h>
  25 #include <stdio.h>
  26 #include <unistd.h>
  27 #include <sys/time.h>
  28 #ifdef HAVE_SYS_SYSCALL_H
  29 # include <sys/syscall.h>
  30 #endif
  31 #ifdef HAVE_SYS_LWP_H
  32 # include <sys/lwp.h>
  33 #endif
  34 #ifdef HAVE_UCONTEXT_H
  35 # include <ucontext.h>
  36 #endif
  37 #ifdef HAVE_SYS_MMAN_H
  38 #include <sys/mman.h>
  39 #endif
  40 #include "thread.h"
  41 #include "wine/server.h"
  42 #include "winbase.h"
  43 #include "wine/winbase16.h"
  44 #include "wine/exception.h"
  45 #include "wine/library.h"
  46 #include "wine/debug.h"
  47
  48 WINE_DEFAULT_DEBUG_CHANNEL(thread);
  49
  50 #if defined(linux) || defined(HAVE_CLONE)
  51 # ifdef HAVE_SCHED_H
  52 #  include <sched.h>
  53 # endif
  54 # ifndef CLONE_VM
  55 #  define CLONE_VM      0x00000100
  56 #  define CLONE_FS      0x00000200
  57 #  define CLONE_FILES   0x00000400
  58 #  define CLONE_SIGHAND 0x00000800
  59 #  define CLONE_PID     0x00001000
  60 # endif  /* CLONE_VM */
  61 #endif  /* linux || HAVE_CLONE */
  62
  63 extern void SELECTOR_FreeFs(void);
  64
  65 struct thread_cleanup_info
  66 {
  67     void *stack_base;
  68     int   stack_size;
  69     int   status;
  70 };
  71
  72 /* temporary stacks used on thread exit */
  73 #define TEMP_STACK_SIZE 1024
  74 #define NB_TEMP_STACKS  8
  75 static char temp_stacks[NB_TEMP_STACKS][TEMP_STACK_SIZE];
  76 static LONG next_temp_stack;  /* next temp stack to use */
  77
  78 /***********************************************************************
  79  *           SYSDEPS_SetCurThread
  80  *
  81  * Make 'thread' the current thread.
  82  */
  83 void SYSDEPS_SetCurThread( TEB *teb )
  84 {
  85 #if defined(__i386__)
  86     /* On the i386, the current thread is in the %fs register */
  87     wine_set_fs( teb->teb_sel );
  88 #elif defined(HAVE__LWP_CREATE)
  89     /* On non-i386 Solaris, we use the LWP private pointer */
  90     _lwp_setprivate( teb );
  91 #endif
  92 }
  93
  94
  95 /***********************************************************************
  96  *           call_on_thread_stack
  97  *
  98  * Call a function once we switched to the thread stack.
  99  */
 100 static void call_on_thread_stack( void *func )
 101 {
 102     __TRY
 103     {
 104         void (*funcptr)(void) = func;
 105         funcptr();
 106     }
 107     __EXCEPT(UnhandledExceptionFilter)
 108     {
 109         TerminateThread( GetCurrentThread(), GetExceptionCode() );
 110     }
 111     __ENDTRY
 112     SYSDEPS_ExitThread(0);  /* should never get here */
 113 }
 114
 115
 116 /***********************************************************************
 117  *           get_temp_stack
 118  *
 119  * Get a temporary stack address to run the thread exit code on.
 120  */
 121 inline static char *get_temp_stack(void)
 122 {
 123     unsigned int next = InterlockedExchangeAdd( &next_temp_stack, 1 );
 124     return temp_stacks[next % NB_TEMP_STACKS];
 125 }
 126
 127
 128 /***********************************************************************
 129  *           cleanup_thread
 130  *
 131  * Cleanup the remains of a thread. Runs on a temporary stack.
 132  */
 133 static void cleanup_thread( void *ptr )
 134 {
 135     /* copy the info structure since it is on the stack we will free */
 136     struct thread_cleanup_info info = *(struct thread_cleanup_info *)ptr;
 137     munmap( info.stack_base, info.stack_size );
 138     SELECTOR_FreeFs();
 139 #ifdef HAVE__LWP_CREATE
 140     _lwp_exit();
 141 #endif
 142     _exit( info.status );
 143 }
 144
 145
 146 /***********************************************************************
 147  *           SYSDEPS_StartThread
 148  *
 149  * Startup routine for a new thread.
 150  */
 151 static void SYSDEPS_StartThread( TEB *teb )
 152 {
 153     SYSDEPS_SetCurThread( teb );
 154     CLIENT_InitThread();
 155     SIGNAL_Init();
 156     __TRY
 157     {
 158         teb->startup();
 159     }
 160     __EXCEPT(UnhandledExceptionFilter)
 161     {
 162         TerminateThread( GetCurrentThread(), GetExceptionCode() );
 163     }
 164     __ENDTRY
 165     SYSDEPS_ExitThread(0);  /* should never get here */
 166 }
 167
 168
 169 /***********************************************************************
 170  *           SYSDEPS_SpawnThread
 171  *
 172  * Start running a new thread.
 173  * Return -1 on error, 0 if OK.
 174  */
 175 int SYSDEPS_SpawnThread( TEB *teb )
 176 {
 177 #ifdef ERRNO_LOCATION
 178
 179 #if defined(linux) || defined(HAVE_CLONE)
 180     const int flags = CLONE_VM | CLONE_FS | CLONE_FILES | SIGCHLD;
 181     if (clone( (int (*)(void *))SYSDEPS_StartThread, teb->stack_top, flags, teb ) < 0)
 182         return -1;
 183     if (!(flags & CLONE_FILES)) close( teb->request_fd );  /* close the child socket in the parent */
 184     return 0;
 185 #endif
 186
 187 #ifdef HAVE_RFORK
 188     const int flags = RFPROC | RFMEM; /*|RFFDG*/
 189     void **sp = (void **)teb->stack_top;
 190     *--sp = teb;
 191     *--sp = 0;
 192     *--sp = SYSDEPS_StartThread;
 193     __asm__ __volatile__(
 194     "pushl %2;\n\t"             /* flags */
 195     "pushl $0;\n\t"             /* 0 ? */
 196     "movl %1,%%eax;\n\t"        /* SYS_rfork */
 197     ".byte 0x9a; .long 0; .word 7;\n\t" /* lcall 7:0... FreeBSD syscall */
 198     "cmpl $0, %%edx;\n\t"
 199     "je 1f;\n\t"
 200     "movl %0,%%esp;\n\t"        /* child -> new thread */
 201     "ret;\n"
 202     "1:\n\t"            /* parent -> caller thread */
 203     "addl $8,%%esp" :
 204     : "r" (sp), "g" (SYS_rfork), "g" (flags)
 205     : "eax", "edx");
 206     if (flags & RFFDG) close( teb->request_fd );  /* close the child socket in the parent */
 207     return 0;
 208 #endif
 209
 210 #ifdef HAVE__LWP_CREATE
 211     ucontext_t context;
 212     _lwp_makecontext( &context, (void(*)(void *))SYSDEPS_StartThread, teb,
 213                       NULL, teb->stack_base, (char *)teb->stack_top - (char *)teb->stack_base );
 214     if ( _lwp_create( &context, 0, NULL ) )
 215         return -1;
 216     return 0;
 217 #endif
 218
 219 #endif /* ERRNO_LOCATION */
 220
 221     FIXME("CreateThread: stub\n" );
 222     return 0;
 223 }
 224
 225
 226 /***********************************************************************
 227  *           SYSDEPS_CallOnStack
 228  */
 229 void SYSDEPS_CallOnStack( void (*func)(LPVOID), LPVOID arg ) WINE_NORETURN;
 230 #ifdef __i386__
 231 #ifdef __GNUC__
 232 __ASM_GLOBAL_FUNC( SYSDEPS_CallOnStack,
 233                    "movl 4(%esp),%ecx\n\t"  /* func */
 234                    "movl 8(%esp),%edx\n\t"  /* arg */
 235                    ".byte 0x64\n\tmovl 0x04,%esp\n\t"  /* teb->stack_top */
 236                    "pushl %edx\n\t"
 237                    "xorl %ebp,%ebp\n\t"
 238                    "call *%ecx\n\t"
 239                    "int $3" /* we never return here */ );
 240 #elif defined(_MSC_VER)
 241 __declspec(naked) void SYSDEPS_CallOnStack( void (*func)(LPVOID), LPVOID arg )
 242 {
 243   __asm mov ecx, 4[esp];
 244   __asm mov edx, 8[esp];
 245   __asm mov fs:[0x04], esp;
 246   __asm push edx;
 247   __asm xor ebp, ebp;
 248   __asm call [ecx];
 249   __asm int 3;
 250 }
 251 #endif /* defined(__GNUC__) || defined(_MSC_VER) */
 252 #else /* defined(__i386__) */
 253 void SYSDEPS_CallOnStack( void (*func)(LPVOID), LPVOID arg )
 254 {
 255     func( arg );
 256     while(1); /* avoid warning */
 257 }
 258 #endif /* defined(__i386__) */
 259
 260
 261 /***********************************************************************
 262  *           SYSDEPS_SwitchToThreadStack
 263  */
 264 void SYSDEPS_SwitchToThreadStack( void (*func)(void) )
 265 {
 266     SYSDEPS_CallOnStack( call_on_thread_stack, func );
 267 }
 268
 269
 270 /***********************************************************************
 271  *           SYSDEPS_ExitThread
 272  *
 273  * Exit a running thread; must not return.
 274  */
 275 void SYSDEPS_ExitThread( int status )
 276 {
 277     TEB *teb = NtCurrentTeb();
 278     struct thread_cleanup_info info;
 279     MEMORY_BASIC_INFORMATION meminfo;
 280
 281     FreeSelector16( teb->stack_sel );
 282     VirtualQuery( teb->stack_top, &meminfo, sizeof(meminfo) );
 283     info.stack_base = meminfo.AllocationBase;
 284     info.stack_size = meminfo.RegionSize + ((char *)teb->stack_top - (char *)meminfo.AllocationBase);
 285     info.status     = status;
 286
 287     SIGNAL_Reset();
 288
 289     VirtualFree( teb->stack_base, 0, MEM_RELEASE | MEM_SYSTEM );
 290     close( teb->wait_fd[0] );
 291     close( teb->wait_fd[1] );
 292     close( teb->reply_fd );
 293     close( teb->request_fd );
 294     teb->stack_low = get_temp_stack();
 295     teb->stack_top = (char *) teb->stack_low + TEMP_STACK_SIZE;
 296     SYSDEPS_CallOnStack( cleanup_thread, &info );
 297 }
 298
 299
 300 /***********************************************************************
 301  *           SYSDEPS_AbortThread
 302  *
 303  * Same as SYSDEPS_ExitThread, but must not do anything that requires a server call.
 304  */
 305 void SYSDEPS_AbortThread( int status )
 306 {
 307     SIGNAL_Reset();
 308     close( NtCurrentTeb()->wait_fd[0] );
 309     close( NtCurrentTeb()->wait_fd[1] );
 310     close( NtCurrentTeb()->reply_fd );
 311     close( NtCurrentTeb()->request_fd );
 312 #ifdef HAVE__LWP_CREATE
 313     _lwp_exit();
 314 #endif
 315     for (;;)  /* avoid warning */
 316         _exit( status );
 317 }
 318
 319
 320 /**********************************************************************
 321  *           NtCurrentTeb   (NTDLL.@)
 322  *
 323  * This will crash and burn if called before threading is initialized
 324  */
 325 #if defined(__i386__) && defined(__GNUC__)
 326 __ASM_GLOBAL_FUNC( NtCurrentTeb, ".byte 0x64\n\tmovl 0x18,%eax\n\tret" );
 327 #elif defined(__i386__) && defined(_MSC_VER)
 328 /* Nothing needs to be done. MS C "magically" exports the inline version from winnt.h */
 329 #elif defined(HAVE__LWP_CREATE)
 330 /***********************************************************************
 331  *              NtCurrentTeb (NTDLL.@)
 332  */
 333 struct _TEB * WINAPI NtCurrentTeb(void)
 334 {
 335     extern void *_lwp_getprivate(void);
 336     return (struct _TEB *)_lwp_getprivate();
 337 }
 338 #else
 339 # error NtCurrentTeb not defined for this architecture
 340 #endif  /* __i386__ */