scheduler/sysdeps.c

   1 /*
   2  * System-dependent scheduler support
   3  *
   4  * Copyright 1998 Alexandre Julliard
   5  */
   6
   7 #include "config.h"
   8
   9 #include <signal.h>
  10 #include <stdio.h>
  11 #include <unistd.h>
  12 #include <sys/time.h>
  13 #include <sys/resource.h>
  14 #ifdef HAVE_SYS_SYSCALL_H
  15 # include <sys/syscall.h>
  16 #endif
  17 #ifdef HAVE_SYS_LWP_H
  18 # include <sys/lwp.h>
  19 #endif
  20 #ifdef HAVE_UCONTEXT_H
  21 # include <ucontext.h>
  22 #endif
  23 #include "wine/port.h"
  24 #include "thread.h"
  25 #include "server.h"
  26 #include "winbase.h"
  27 #include "wine/exception.h"
  28 #include "debugtools.h"
  29
  30 DEFAULT_DEBUG_CHANNEL(thread);
  31
  32 #ifdef linux
  33 # ifdef HAVE_SCHED_H
  34 #  include <sched.h>
  35 # endif
  36 # ifndef CLONE_VM
  37 #  define CLONE_VM      0x00000100
  38 #  define CLONE_FS      0x00000200
  39 #  define CLONE_FILES   0x00000400
  40 #  define CLONE_SIGHAND 0x00000800
  41 #  define CLONE_PID     0x00001000
  42 # endif  /* CLONE_VM */
  43 #endif  /* linux */
  44
  45 /***********************************************************************
  46  *           SYSDEPS_SetCurThread
  47  *
  48  * Make 'thread' the current thread.
  49  */
  50 void SYSDEPS_SetCurThread( TEB *teb )
  51 {
  52 #if defined(__i386__)
  53     /* On the i386, the current thread is in the %fs register */
  54     __set_fs( teb->teb_sel );
  55 #elif defined(HAVE__LWP_CREATE)
  56     /* On non-i386 Solaris, we use the LWP private pointer */
  57     _lwp_setprivate( teb );
  58 #endif
  59 }
  60
  61 /***********************************************************************
  62  *           SYSDEPS_StartThread
  63  *
  64  * Startup routine for a new thread.
  65  */
  66 static void SYSDEPS_StartThread( TEB *teb )
  67 {
  68     SYSDEPS_SetCurThread( teb );
  69     CLIENT_InitThread();
  70     SIGNAL_Init();
  71     __TRY
  72     {
  73         teb->startup();
  74     }
  75     __EXCEPT(UnhandledExceptionFilter)
  76     {
  77         TerminateThread( GetCurrentThread(), GetExceptionCode() );
  78     }
  79     __ENDTRY
  80     SYSDEPS_ExitThread(0);  /* should never get here */
  81 }
  82
  83
  84 /***********************************************************************
  85  *           SYSDEPS_SpawnThread
  86  *
  87  * Start running a new thread.
  88  * Return -1 on error, 0 if OK.
  89  */
  90 int SYSDEPS_SpawnThread( TEB *teb )
  91 {
  92 #ifdef ERRNO_LOCATION
  93
  94 #ifdef linux
  95     const int flags = CLONE_VM | CLONE_FS | CLONE_FILES | SIGCHLD;
  96     if (clone( (int (*)(void *))SYSDEPS_StartThread, teb->stack_top, flags, teb ) < 0)
  97         return -1;
  98     if (!(flags & CLONE_FILES)) close( teb->request_fd );  /* close the child socket in the parent */
  99     return 0;
 100 #endif
 101
 102 #ifdef HAVE_RFORK
 103     const int flags = RFPROC | RFMEM; /*|RFFDG*/
 104     void **sp = (void **)teb->stack_top;
 105     *--sp = teb;
 106     *--sp = 0;
 107     *--sp = SYSDEPS_StartThread;
 108     __asm__ __volatile__(
 109     "pushl %2;\n\t"             /* flags */
 110     "pushl $0;\n\t"             /* 0 ? */
 111     "movl %1,%%eax;\n\t"        /* SYS_rfork */
 112     ".byte 0x9a; .long 0; .word 7;\n\t" /* lcall 7:0... FreeBSD syscall */
 113     "cmpl $0, %%edx;\n\t"
 114     "je 1f;\n\t"
 115     "movl %0,%%esp;\n\t"        /* child -> new thread */
 116     "ret;\n"
 117     "1:\n\t"            /* parent -> caller thread */
 118     "addl $8,%%esp" :
 119     : "r" (sp), "g" (SYS_rfork), "g" (flags)
 120     : "eax", "edx");
 121     if (flags & RFFDG) close( teb->request_fd );  /* close the child socket in the parent */
 122     return 0;
 123 #endif
 124
 125 #ifdef HAVE__LWP_CREATE
 126     ucontext_t context;
 127     _lwp_makecontext( &context, (void(*)(void *))SYSDEPS_StartThread, teb,
 128                       NULL, teb->stack_base, (char *)teb->stack_top - (char *)teb->stack_base );
 129     if ( _lwp_create( &context, 0, NULL ) )
 130         return -1;
 131     return 0;
 132 #endif
 133
 134 #endif /* ERRNO_LOCATION */
 135
 136     FIXME("CreateThread: stub\n" );
 137     return 0;
 138 }
 139
 140
 141
 142 /***********************************************************************
 143  *           SYSDEPS_ExitThread
 144  *
 145  * Exit a running thread; must not return.
 146  */
 147 void SYSDEPS_ExitThread( int status )
 148 {
 149     int fd = NtCurrentTeb()->request_fd;
 150     NtCurrentTeb()->request_fd = -1;
 151     close( fd );
 152 #ifdef HAVE__LWP_CREATE
 153     _lwp_exit();
 154 #endif
 155     _exit( status );
 156     /*
 157      * It is of course impossible to come here,
 158      * but it eliminates a compiler warning.
 159      */
 160     exit( status );
 161 }
 162
 163
 164 /***********************************************************************
 165  *           SYSDEPS_CallOnStack
 166  */
 167 int SYSDEPS_DoCallOnStack( int (*func)(LPVOID), LPVOID arg )
 168 {
 169     int retv = 0;
 170
 171     __TRY
 172     {
 173         retv = func( arg );
 174     }
 175     __EXCEPT(UnhandledExceptionFilter)
 176     {
 177         TerminateThread( GetCurrentThread(), GetExceptionCode() );
 178         return 0;
 179     }
 180     __ENDTRY
 181
 182     return retv;
 183 }
 184
 185 #ifdef __i386__
 186 int SYSDEPS_CallOnStack( LPVOID stackTop, LPVOID stackLow,
 187                          int (*func)(LPVOID), LPVOID arg );
 188 __ASM_GLOBAL_FUNC( SYSDEPS_CallOnStack,
 189                    "pushl %ebp\n\t"
 190                    "movl %esp, %ebp\n\t"
 191                    ".byte 0x64; pushl 0x04\n\t"
 192                    ".byte 0x64; pushl 0x08\n\t"
 193                    "movl 8(%ebp), %esp\n\t"
 194                    "movl 12(%ebp), %eax\n\t"
 195                    ".byte 0x64; movl %esp, 0x04\n\t"
 196                    ".byte 0x64; movl %eax, 0x08\n\t"
 197                    "pushl 20(%ebp)\n\t"
 198                    "pushl 16(%ebp)\n\t"
 199                    "call " __ASM_NAME("SYSDEPS_DoCallOnStack") "\n\t"
 200                    "leal -8(%ebp), %esp\n\t"
 201                    ".byte 0x64; popl 0x08\n\t"
 202                    ".byte 0x64; popl 0x04\n\t"
 203                    "popl %ebp\n\t"
 204                    "ret" );
 205 #else
 206 int SYSDEPS_CallOnStack( LPVOID stackTop, LPVOID stackLow,
 207                          int (*func)(LPVOID), LPVOID arg )
 208 {
 209     return SYSDEPS_DoCallOnStack( func, arg );
 210 }
 211 #endif
 212
 213 /***********************************************************************
 214  *           SYSDEPS_SwitchToThreadStack
 215  */
 216 void SYSDEPS_SwitchToThreadStack( void (*func)(void) )
 217 {
 218     DWORD page_size = getpagesize();
 219     DWORD cur_stack = (((DWORD)&func) + (page_size-1)) & ~(page_size-1);
 220
 221     TEB *teb = NtCurrentTeb();
 222     LPVOID stackTop = teb->stack_top;
 223     LPVOID stackLow = teb->stack_low;
 224
 225     struct rlimit rl;
 226
 227     if ( getrlimit(RLIMIT_STACK, &rl) < 0 )
 228     {
 229         WARN("Can't get rlimit\n");
 230         rl.rlim_cur = 8*1024*1024;
 231     }
 232
 233     teb->stack_top = (LPVOID) cur_stack;
 234     teb->stack_low = (LPVOID)(cur_stack - rl.rlim_cur);
 235
 236     SYSDEPS_CallOnStack( stackTop, stackLow,
 237                          (int (*)(void *))func, NULL );
 238 }
 239
 240 /**********************************************************************
 241  *           NtCurrentTeb   (NTDLL.@)
 242  *
 243  * This will crash and burn if called before threading is initialized
 244  */
 245 #ifdef __i386__
 246 __ASM_GLOBAL_FUNC( NtCurrentTeb, ".byte 0x64\n\tmovl 0x18,%eax\n\tret" );
 247 #elif defined(HAVE__LWP_CREATE)
 248 struct _TEB * WINAPI NtCurrentTeb(void)
 249 {
 250     extern void *_lwp_getprivate(void);
 251     return (struct _TEB *)_lwp_getprivate();
 252 }
 253 #else
 254 # error NtCurrentTeb not defined for this architecture
 255 #endif  /* __i386__ */