loader/pthread.c

   1 /*
   2  * Wine threading routines using the pthread library
   3  *
   4  * Copyright 2003 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #ifdef HAVE_PTHREAD_H
  25
  26 #include <assert.h>
  27 #include <stdlib.h>
  28 #include <signal.h>
  29 #ifdef HAVE_UNISTD_H
  30 # include <unistd.h>
  31 #endif
  32 #include <string.h>
  33 #include <sys/types.h>
  34 #ifdef HAVE_SYS_MMAN_H
  35 #include <sys/mman.h>
  36 #endif
  37
  38 #include "wine/library.h"
  39 #include "wine/pthread.h"
  40
  41 static int init_done;
  42 static int nb_threads = 1;
  43
  44 #ifndef __i386__
  45 static pthread_key_t teb_key;
  46 #endif
  47
  48 /***********************************************************************
  49  *           init_process
  50  *
  51  * Initialization for a newly created process.
  52  */
  53 static void init_process( const struct wine_pthread_callbacks *callbacks, size_t size )
  54 {
  55     init_done = 1;
  56 }
  57
  58
  59 /***********************************************************************
  60  *           init_thread
  61  *
  62  * Initialization for a newly created thread.
  63  */
  64 static void init_thread( struct wine_pthread_thread_info *info )
  65 {
  66     /* retrieve the stack info (except for main thread) */
  67     if (init_done)
  68     {
  69 #ifdef HAVE_PTHREAD_GETATTR_NP
  70         pthread_attr_t attr;
  71         pthread_getattr_np( pthread_self(), &attr );
  72         pthread_attr_getstack( &attr, &info->stack_base, &info->stack_size );
  73         pthread_attr_destroy( &attr );
  74 #elif defined(HAVE_PTHREAD_ATTR_GET_NP)
  75         pthread_attr_t attr;
  76         pthread_attr_init( &attr );
  77         pthread_attr_get_np( pthread_self(), &attr );
  78         pthread_attr_getstack( &attr, &info->stack_base, &info->stack_size );
  79         pthread_attr_destroy( &attr );
  80 #elif defined(HAVE_PTHREAD_GET_STACKSIZE_NP) && defined(HAVE_PTHREAD_GET_STACKADDR_NP)
  81         char dummy;
  82         info->stack_size = pthread_get_stacksize_np(pthread_self());
  83         info->stack_base = pthread_get_stackaddr_np(pthread_self());
  84         /* if base is too large assume it's the top of the stack instead */
  85         if ((char *)info->stack_base > &dummy)
  86             info->stack_base = (char *)info->stack_base - info->stack_size;
  87 #else
  88         /* assume that the stack allocation is page aligned */
  89         char dummy;
  90         size_t page_size = getpagesize();
  91         char *stack_top = (char *)((unsigned long)&dummy & ~(page_size - 1)) + page_size;
  92         info->stack_base = stack_top - info->stack_size;
  93 #endif
  94     }
  95 }
  96
  97
  98 /***********************************************************************
  99  *           create_thread
 100  */
 101 static int create_thread( struct wine_pthread_thread_info *info )
 102 {
 103     pthread_t id;
 104     pthread_attr_t attr;
 105     int ret = 0;
 106
 107     pthread_attr_init( &attr );
 108     pthread_attr_setstacksize( &attr, info->stack_size );
 109     pthread_attr_setdetachstate( &attr, PTHREAD_CREATE_DETACHED );
 110     pthread_attr_setscope( &attr, PTHREAD_SCOPE_SYSTEM ); /* force creating a kernel thread on Solaris */
 111     interlocked_xchg_add( &nb_threads, 1 );
 112     if (pthread_create( &id, &attr, (void * (*)(void *))info->entry, info ))
 113     {
 114         interlocked_xchg_add( &nb_threads, -1 );
 115         ret = -1;
 116     }
 117     pthread_attr_destroy( &attr );
 118     return ret;
 119 }
 120
 121
 122 /***********************************************************************
 123  *           init_current_teb
 124  *
 125  * Set the current TEB for a new thread.
 126  */
 127 static void init_current_teb( struct wine_pthread_thread_info *info )
 128 {
 129 #ifdef __i386__
 130     /* On the i386, the current thread is in the %fs register */
 131     LDT_ENTRY fs_entry;
 132
 133     wine_ldt_set_base( &fs_entry, info->teb_base );
 134     wine_ldt_set_limit( &fs_entry, info->teb_size - 1 );
 135     wine_ldt_set_flags( &fs_entry, WINE_LDT_FLAGS_DATA|WINE_LDT_FLAGS_32BIT );
 136     wine_ldt_init_fs( info->teb_sel, &fs_entry );
 137 #else
 138     if (!init_done)  /* first thread */
 139         pthread_key_create( &teb_key, NULL );
 140     pthread_setspecific( teb_key, info->teb_base );
 141 #endif
 142
 143     /* set pid and tid */
 144     info->pid = getpid();
 145 #ifdef __sun
 146     info->tid = pthread_self();  /* this should return the lwp id on solaris */
 147 #else
 148     info->tid = gettid();
 149 #endif
 150 }
 151
 152
 153 /***********************************************************************
 154  *           get_current_teb
 155  */
 156 static void *get_current_teb(void)
 157 {
 158 #ifdef __i386__
 159     void *ret;
 160     __asm__( ".byte 0x64\n\tmovl 0x18,%0" : "=r" (ret) );
 161     return ret;
 162 #else
 163     return pthread_getspecific( teb_key );
 164 #endif
 165 }
 166
 167
 168 /***********************************************************************
 169  *           exit_thread
 170  */
 171 static void DECLSPEC_NORETURN exit_thread( struct wine_pthread_thread_info *info )
 172 {
 173     if (interlocked_xchg_add( &nb_threads, -1 ) <= 1) exit( info->exit_status );
 174     wine_ldt_free_fs( info->teb_sel );
 175     if (info->teb_size) munmap( info->teb_base, info->teb_size );
 176     pthread_exit( (void *)info->exit_status );
 177 }
 178
 179
 180 /***********************************************************************
 181  *           abort_thread
 182  */
 183 static void DECLSPEC_NORETURN abort_thread( long status )
 184 {
 185     if (interlocked_xchg_add( &nb_threads, -1 ) <= 1) _exit( status );
 186     pthread_exit( (void *)status );
 187 }
 188
 189
 190 /***********************************************************************
 191  *           pthread_functions
 192  */
 193 const struct wine_pthread_functions pthread_functions =
 194 {
 195     init_process,
 196     init_thread,
 197     create_thread,
 198     init_current_teb,
 199     get_current_teb,
 200     exit_thread,
 201     abort_thread,
 202     pthread_sigmask
 203 };
 204
 205 #endif  /* HAVE_PTHREAD_H */