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 #ifdef HAVE_UNISTD_H
  27 # include <unistd.h>
  28 #endif
  29 #ifdef HAVE_SYS_TIME_H
  30 # include <sys/time.h>
  31 #endif
  32 #ifdef HAVE_SYS_SYSCALL_H
  33 # include <sys/syscall.h>
  34 #endif
  35 #ifdef HAVE_SYS_LWP_H
  36 # include <sys/lwp.h>
  37 #endif
  38 #ifdef HAVE_UCONTEXT_H
  39 # include <ucontext.h>
  40 #endif
  41 #ifdef HAVE_SYS_MMAN_H
  42 #include <sys/mman.h>
  43 #endif
  44 #include "thread.h"
  45 #include "wine/server.h"
  46 #include "winbase.h"
  47 #include "wine/winbase16.h"
  48 #include "wine/exception.h"
  49 #include "wine/library.h"
  50 #include "wine/debug.h"
  51
  52 WINE_DEFAULT_DEBUG_CHANNEL(thread);
  53
  54 #if defined(linux) || defined(HAVE_CLONE)
  55 # ifdef HAVE_SCHED_H
  56 #  include <sched.h>
  57 # endif
  58 # ifndef CLONE_VM
  59 #  define CLONE_VM      0x00000100
  60 #  define CLONE_FS      0x00000200
  61 #  define CLONE_FILES   0x00000400
  62 #  define CLONE_SIGHAND 0x00000800
  63 #  define CLONE_PID     0x00001000
  64 # endif  /* CLONE_VM */
  65 #endif  /* linux || HAVE_CLONE */
  66
  67 extern void SELECTOR_FreeFs(void);
  68
  69 struct thread_cleanup_info
  70 {
  71     void *stack_base;
  72     int   stack_size;
  73     int   status;
  74 };
  75
  76 /* temporary stacks used on thread exit */
  77 #define TEMP_STACK_SIZE 1024
  78 #define NB_TEMP_STACKS  8
  79 static char temp_stacks[NB_TEMP_STACKS][TEMP_STACK_SIZE];
  80 static LONG next_temp_stack;  /* next temp stack to use */
  81
  82 /***********************************************************************
  83  *           SYSDEPS_SetCurThread
  84  *
  85  * Make 'thread' the current thread.
  86  */
  87 void SYSDEPS_SetCurThread( TEB *teb )
  88 {
  89 #if defined(__i386__)
  90     /* On the i386, the current thread is in the %fs register */
  91     wine_set_fs( teb->teb_sel );
  92 #elif defined(__powerpc__)
  93     /* On PowerPC, the current TEB is in the gpr13 register */
  94     __asm__ __volatile__("mr 2, %0" : : "r" (teb));
  95 #elif defined(HAVE__LWP_CREATE)
  96     /* On non-i386 Solaris, we use the LWP private pointer */
  97     _lwp_setprivate( teb );
  98 #endif
  99 }
 100
 101
 102 /***********************************************************************
 103  *           call_on_thread_stack
 104  *
 105  * Call a function once we switched to the thread stack.
 106  */
 107 static void call_on_thread_stack( void *func )
 108 {
 109     __TRY
 110     {
 111         void (*funcptr)(void) = func;
 112         funcptr();
 113     }
 114     __EXCEPT(UnhandledExceptionFilter)
 115     {
 116         TerminateThread( GetCurrentThread(), GetExceptionCode() );
 117     }
 118     __ENDTRY
 119     SYSDEPS_ExitThread(0);  /* should never get here */
 120 }
 121
 122
 123 /***********************************************************************
 124  *           get_temp_stack
 125  *
 126  * Get a temporary stack address to run the thread exit code on.
 127  */
 128 inline static char *get_temp_stack(void)
 129 {
 130     unsigned int next = InterlockedExchangeAdd( &next_temp_stack, 1 );
 131     return temp_stacks[next % NB_TEMP_STACKS];
 132 }
 133
 134
 135 /***********************************************************************
 136  *           cleanup_thread
 137  *
 138  * Cleanup the remains of a thread. Runs on a temporary stack.
 139  */
 140 static void cleanup_thread( void *ptr )
 141 {
 142     /* copy the info structure since it is on the stack we will free */
 143     struct thread_cleanup_info info = *(struct thread_cleanup_info *)ptr;
 144     munmap( info.stack_base, info.stack_size );
 145     SELECTOR_FreeFs();
 146 #ifdef HAVE__LWP_CREATE
 147     _lwp_exit();
 148 #endif
 149     _exit( info.status );
 150 }
 151
 152
 153 /***********************************************************************
 154  *           SYSDEPS_StartThread
 155  *
 156  * Startup routine for a new thread.
 157  */
 158 static void SYSDEPS_StartThread( TEB *teb )
 159 {
 160     SYSDEPS_SetCurThread( teb );
 161     CLIENT_InitThread();
 162     SIGNAL_Init();
 163     __TRY
 164     {
 165         teb->startup();
 166     }
 167     __EXCEPT(UnhandledExceptionFilter)
 168     {
 169         TerminateThread( GetCurrentThread(), GetExceptionCode() );
 170     }
 171     __ENDTRY
 172     SYSDEPS_ExitThread(0);  /* should never get here */
 173 }
 174
 175
 176 /***********************************************************************
 177  *           SYSDEPS_SpawnThread
 178  *
 179  * Start running a new thread.
 180  * Return -1 on error, 0 if OK.
 181  */
 182 int SYSDEPS_SpawnThread( TEB *teb )
 183 {
 184 #ifdef ERRNO_LOCATION
 185
 186 #if defined(linux) || defined(HAVE_CLONE)
 187     const int flags = CLONE_VM | CLONE_FS | CLONE_FILES | SIGCHLD;
 188     if (clone( (int (*)(void *))SYSDEPS_StartThread, teb->stack_top, flags, teb ) < 0)
 189         return -1;
 190     if (!(flags & CLONE_FILES)) close( teb->request_fd );  /* close the child socket in the parent */
 191     return 0;
 192 #endif
 193
 194 #ifdef HAVE_RFORK
 195     const int flags = RFPROC | RFMEM; /*|RFFDG*/
 196     void **sp = (void **)teb->stack_top;
 197     *--sp = teb;
 198     *--sp = 0;
 199     *--sp = SYSDEPS_StartThread;
 200     __asm__ __volatile__(
 201     "pushl %2;\n\t"             /* flags */
 202     "pushl $0;\n\t"             /* 0 ? */
 203     "movl %1,%%eax;\n\t"        /* SYS_rfork */
 204     ".byte 0x9a; .long 0; .word 7;\n\t" /* lcall 7:0... FreeBSD syscall */
 205     "cmpl $0, %%edx;\n\t"
 206     "je 1f;\n\t"
 207     "movl %0,%%esp;\n\t"        /* child -> new thread */
 208     "ret;\n"
 209     "1:\n\t"            /* parent -> caller thread */
 210     "addl $8,%%esp" :
 211     : "r" (sp), "g" (SYS_rfork), "g" (flags)
 212     : "eax", "edx");
 213     if (flags & RFFDG) close( teb->request_fd );  /* close the child socket in the parent */
 214     return 0;
 215 #endif
 216
 217 #ifdef HAVE__LWP_CREATE
 218     ucontext_t context;
 219     _lwp_makecontext( &context, (void(*)(void *))SYSDEPS_StartThread, teb,
 220                       NULL, teb->stack_base, (char *)teb->stack_top - (char *)teb->stack_base );
 221     if ( _lwp_create( &context, 0, NULL ) )
 222         return -1;
 223     return 0;
 224 #endif
 225
 226 #endif /* ERRNO_LOCATION */
 227
 228     FIXME("CreateThread: stub\n" );
 229     return 0;
 230 }
 231
 232
 233 /***********************************************************************
 234  *           SYSDEPS_CallOnStack
 235  */
 236 void SYSDEPS_CallOnStack( void (*func)(LPVOID), LPVOID arg ) WINE_NORETURN;
 237 #ifdef __i386__
 238 #ifdef __GNUC__
 239 __ASM_GLOBAL_FUNC( SYSDEPS_CallOnStack,
 240                    "movl 4(%esp),%ecx\n\t"  /* func */
 241                    "movl 8(%esp),%edx\n\t"  /* arg */
 242                    ".byte 0x64\n\tmovl 0x04,%esp\n\t"  /* teb->stack_top */
 243                    "pushl %edx\n\t"
 244                    "xorl %ebp,%ebp\n\t"
 245                    "call *%ecx\n\t"
 246                    "int $3" /* we never return here */ );
 247 #elif defined(_MSC_VER)
 248 __declspec(naked) void SYSDEPS_CallOnStack( void (*func)(LPVOID), LPVOID arg )
 249 {
 250   __asm mov ecx, 4[esp];
 251   __asm mov edx, 8[esp];
 252   __asm mov fs:[0x04], esp;
 253   __asm push edx;
 254   __asm xor ebp, ebp;
 255   __asm call [ecx];
 256   __asm int 3;
 257 }
 258 #endif /* defined(__GNUC__) || defined(_MSC_VER) */
 259 #else /* !defined(__i386__) */
 260 void SYSDEPS_CallOnStack( void (*func)(LPVOID), LPVOID arg )
 261 {
 262     func( arg );
 263     while(1); /* avoid warning */
 264 }
 265 #endif /* !defined(__i386__) */
 266
 267
 268 /***********************************************************************
 269  *           SYSDEPS_SwitchToThreadStack
 270  */
 271 void SYSDEPS_SwitchToThreadStack( void (*func)(void) )
 272 {
 273     SYSDEPS_CallOnStack( call_on_thread_stack, func );
 274 }
 275
 276
 277 /***********************************************************************
 278  *           SYSDEPS_ExitThread
 279  *
 280  * Exit a running thread; must not return.
 281  */
 282 void SYSDEPS_ExitThread( int status )
 283 {
 284     TEB *teb = NtCurrentTeb();
 285     struct thread_cleanup_info info;
 286     MEMORY_BASIC_INFORMATION meminfo;
 287
 288     FreeSelector16( teb->stack_sel );
 289     VirtualQuery( teb->stack_top, &meminfo, sizeof(meminfo) );
 290     info.stack_base = meminfo.AllocationBase;
 291     info.stack_size = meminfo.RegionSize + ((char *)teb->stack_top - (char *)meminfo.AllocationBase);
 292     info.status     = status;
 293
 294     SIGNAL_Reset();
 295
 296     VirtualFree( teb->stack_base, 0, MEM_RELEASE | MEM_SYSTEM );
 297     close( teb->wait_fd[0] );
 298     close( teb->wait_fd[1] );
 299     close( teb->reply_fd );
 300     close( teb->request_fd );
 301     teb->stack_low = get_temp_stack();
 302     teb->stack_top = (char *) teb->stack_low + TEMP_STACK_SIZE;
 303     SYSDEPS_CallOnStack( cleanup_thread, &info );
 304 }
 305
 306
 307 /***********************************************************************
 308  *           SYSDEPS_AbortThread
 309  *
 310  * Same as SYSDEPS_ExitThread, but must not do anything that requires a server call.
 311  */
 312 void SYSDEPS_AbortThread( int status )
 313 {
 314     SIGNAL_Reset();
 315     close( NtCurrentTeb()->wait_fd[0] );
 316     close( NtCurrentTeb()->wait_fd[1] );
 317     close( NtCurrentTeb()->reply_fd );
 318     close( NtCurrentTeb()->request_fd );
 319 #ifdef HAVE__LWP_CREATE
 320     _lwp_exit();
 321 #endif
 322     for (;;)  /* avoid warning */
 323         _exit( status );
 324 }
 325
 326
 327 /**********************************************************************
 328  *           NtCurrentTeb   (NTDLL.@)
 329  *
 330  * This will crash and burn if called before threading is initialized
 331  */
 332 #if defined(__i386__) && defined(__GNUC__)
 333 __ASM_GLOBAL_FUNC( NtCurrentTeb, ".byte 0x64\n\tmovl 0x18,%eax\n\tret" );
 334 #elif defined(__i386__) && defined(_MSC_VER)
 335 /* Nothing needs to be done. MS C "magically" exports the inline version from winnt.h */
 336 #elif defined(HAVE__LWP_CREATE)
 337 /***********************************************************************
 338  *              NtCurrentTeb (NTDLL.@)
 339  */
 340 struct _TEB * WINAPI NtCurrentTeb(void)
 341 {
 342     extern void *_lwp_getprivate(void);
 343     return (struct _TEB *)_lwp_getprivate();
 344 }
 345 #elif defined(__powerpc__)
 346 __ASM_GLOBAL_FUNC( NtCurrentTeb, "\n\tmr 3,2\n\tblr" );
 347 #else
 348 # error NtCurrentTeb not defined for this architecture
 349 #endif  /* __i386__ */