scheduler/synchro.c

   1 /*
   2  * Win32 process and thread synchronisation
   3  *
   4  * Copyright 1997 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 <assert.h>
  22 #include <errno.h>
  23 #include <signal.h>
  24 #include <sys/time.h>
  25 #include <sys/poll.h>
  26 #include <unistd.h>
  27 #include <string.h>
  28
  29 #include "file.h"  /* for DOSFS_UnixTimeToFileTime */
  30 #include "thread.h"
  31 #include "winerror.h"
  32 #include "wine/server.h"
  33
  34
  35 /***********************************************************************
  36  *              get_timeout
  37  */
  38 inline static void get_timeout( struct timeval *when, int timeout )
  39 {
  40     gettimeofday( when, 0 );
  41     if (timeout)
  42     {
  43         long sec = timeout / 1000;
  44         if ((when->tv_usec += (timeout - 1000*sec) * 1000) >= 1000000)
  45         {
  46             when->tv_usec -= 1000000;
  47             when->tv_sec++;
  48         }
  49         when->tv_sec += sec;
  50     }
  51 }
  52
  53 static void CALLBACK call_completion_routine(ULONG_PTR data)
  54 {
  55     async_private* ovp = (async_private*)data;
  56
  57     ovp->completion_func(ovp->lpOverlapped->Internal,
  58                          ovp->lpOverlapped->InternalHigh,
  59                          ovp->lpOverlapped);
  60     ovp->completion_func=NULL;
  61     HeapFree(GetProcessHeap(), 0, ovp);
  62 }
  63
  64 void finish_async(async_private *ovp, DWORD status)
  65 {
  66     ovp->lpOverlapped->Internal=status;
  67
  68     /* call ReadFileEx/WriteFileEx's overlapped completion function */
  69     if(ovp->completion_func)
  70     {
  71         QueueUserAPC(call_completion_routine,GetCurrentThread(),(ULONG_PTR)ovp);
  72     }
  73
  74     /* remove it from the active list */
  75     if(ovp->prev)
  76         ovp->prev->next = ovp->next;
  77     else
  78         NtCurrentTeb()->pending_list = ovp->next;
  79
  80     if(ovp->next)
  81         ovp->next->prev = ovp->prev;
  82
  83     ovp->next=NULL;
  84     ovp->prev=NULL;
  85
  86     close(ovp->fd);
  87     if(!ovp->completion_func) HeapFree(GetProcessHeap(), 0, ovp);
  88 }
  89
  90 /***********************************************************************
  91  *           check_async_list
  92  *
  93  * Process a status event from the server.
  94  */
  95 void WINAPI check_async_list(LPOVERLAPPED overlapped, DWORD status)
  96 {
  97     async_private *ovp;
  98
  99     /* fprintf(stderr,"overlapped %p status %x\n",overlapped,status); */
 100
 101     for(ovp = NtCurrentTeb()->pending_list; ovp; ovp = ovp->next)
 102         if(ovp->lpOverlapped == overlapped)
 103             break;
 104
 105     if(!ovp)
 106             return;
 107
 108     if(status != STATUS_ALERTED)
 109         ovp->lpOverlapped->Internal = status;
 110
 111     if(ovp->lpOverlapped->Internal==STATUS_PENDING)
 112         {
 113         ovp->func(ovp);
 114         FILE_StartAsync(ovp->handle, ovp->lpOverlapped, ovp->type, 0, ovp->lpOverlapped->Internal);
 115         }
 116
 117     if(ovp->lpOverlapped->Internal!=STATUS_PENDING)
 118         finish_async(ovp,ovp->lpOverlapped->Internal);
 119 }
 120
 121
 122 /***********************************************************************
 123  *              wait_reply
 124  *
 125  * Wait for a reply on the waiting pipe of the current thread.
 126  */
 127 static int wait_reply( void *cookie )
 128 {
 129     int signaled;
 130     struct wake_up_reply reply;
 131     for (;;)
 132     {
 133         int ret;
 134         ret = read( NtCurrentTeb()->wait_fd[0], &reply, sizeof(reply) );
 135         if (ret == sizeof(reply))
 136         {
 137             if (!reply.cookie) break;  /* thread got killed */
 138             if (reply.cookie == cookie) return reply.signaled;
 139             /* we stole another reply, wait for the real one */
 140             signaled = wait_reply( cookie );
 141             /* and now put the wrong one back in the pipe */
 142             for (;;)
 143             {
 144                 ret = write( NtCurrentTeb()->wait_fd[1], &reply, sizeof(reply) );
 145                 if (ret == sizeof(reply)) break;
 146                 if (ret >= 0) server_protocol_error( "partial wakeup write %d\n", ret );
 147                 if (errno == EINTR) continue;
 148                 server_protocol_perror("wakeup write");
 149             }
 150             return signaled;
 151         }
 152         if (ret >= 0) server_protocol_error( "partial wakeup read %d\n", ret );
 153         if (errno == EINTR) continue;
 154         server_protocol_perror("wakeup read");
 155     }
 156     /* the server closed the connection; time to die... */
 157     SYSDEPS_AbortThread(0);
 158 }
 159
 160
 161 /***********************************************************************
 162  *              call_apcs
 163  *
 164  * Call outstanding APCs.
 165  */
 166 static void call_apcs( BOOL alertable )
 167 {
 168     FARPROC proc = NULL;
 169     FILETIME ft;
 170     void *args[4];
 171
 172     for (;;)
 173     {
 174         int type = APC_NONE;
 175         SERVER_START_REQ( get_apc )
 176         {
 177             req->alertable = alertable;
 178             wine_server_set_reply( req, args, sizeof(args) );
 179             if (!wine_server_call( req ))
 180             {
 181                 type = reply->type;
 182                 proc = reply->func;
 183             }
 184         }
 185         SERVER_END_REQ;
 186
 187         switch(type)
 188         {
 189         case APC_NONE:
 190             return;  /* no more APCs */
 191         case APC_ASYNC:
 192             proc( args[0], args[1]);
 193             break;
 194         case APC_USER:
 195             proc( args[0] );
 196             break;
 197         case APC_TIMER:
 198             /* convert sec/usec to NT time */
 199             DOSFS_UnixTimeToFileTime( (time_t)args[0], &ft, (DWORD)args[1] * 10 );
 200             proc( args[2], ft.dwLowDateTime, ft.dwHighDateTime );
 201             break;
 202         default:
 203             server_protocol_error( "get_apc_request: bad type %d\n", type );
 204             break;
 205         }
 206     }
 207 }
 208
 209 /***********************************************************************
 210  *              Sleep  (KERNEL32.@)
 211  */
 212 VOID WINAPI Sleep( DWORD timeout )
 213 {
 214     WaitForMultipleObjectsEx( 0, NULL, FALSE, timeout, FALSE );
 215 }
 216
 217 /******************************************************************************
 218  *              SleepEx   (KERNEL32.@)
 219  */
 220 DWORD WINAPI SleepEx( DWORD timeout, BOOL alertable )
 221 {
 222     DWORD ret = WaitForMultipleObjectsEx( 0, NULL, FALSE, timeout, alertable );
 223     if (ret != WAIT_IO_COMPLETION) ret = 0;
 224     return ret;
 225 }
 226
 227
 228 /***********************************************************************
 229  *           WaitForSingleObject   (KERNEL32.@)
 230  */
 231 DWORD WINAPI WaitForSingleObject( HANDLE handle, DWORD timeout )
 232 {
 233     return WaitForMultipleObjectsEx( 1, &handle, FALSE, timeout, FALSE );
 234 }
 235
 236
 237 /***********************************************************************
 238  *           WaitForSingleObjectEx   (KERNEL32.@)
 239  */
 240 DWORD WINAPI WaitForSingleObjectEx( HANDLE handle, DWORD timeout,
 241                                     BOOL alertable )
 242 {
 243     return WaitForMultipleObjectsEx( 1, &handle, FALSE, timeout, alertable );
 244 }
 245
 246
 247 /***********************************************************************
 248  *           WaitForMultipleObjects   (KERNEL32.@)
 249  */
 250 DWORD WINAPI WaitForMultipleObjects( DWORD count, const HANDLE *handles,
 251                                      BOOL wait_all, DWORD timeout )
 252 {
 253     return WaitForMultipleObjectsEx( count, handles, wait_all, timeout, FALSE );
 254 }
 255
 256
 257 /***********************************************************************
 258  *           WaitForMultipleObjectsEx   (KERNEL32.@)
 259  */
 260 DWORD WINAPI WaitForMultipleObjectsEx( DWORD count, const HANDLE *handles,
 261                                        BOOL wait_all, DWORD timeout,
 262                                        BOOL alertable )
 263 {
 264     int ret, cookie;
 265     struct timeval tv;
 266
 267     if (count > MAXIMUM_WAIT_OBJECTS)
 268     {
 269         SetLastError( ERROR_INVALID_PARAMETER );
 270         return WAIT_FAILED;
 271     }
 272
 273     if (timeout == INFINITE) tv.tv_sec = tv.tv_usec = 0;
 274     else get_timeout( &tv, timeout );
 275
 276     for (;;)
 277     {
 278         SERVER_START_REQ( select )
 279         {
 280             req->flags   = SELECT_INTERRUPTIBLE;
 281             req->cookie  = &cookie;
 282             req->sec     = tv.tv_sec;
 283             req->usec    = tv.tv_usec;
 284             wine_server_add_data( req, handles, count * sizeof(HANDLE) );
 285
 286             if (wait_all) req->flags |= SELECT_ALL;
 287             if (alertable) req->flags |= SELECT_ALERTABLE;
 288             if (timeout != INFINITE) req->flags |= SELECT_TIMEOUT;
 289
 290             ret = wine_server_call( req );
 291         }
 292         SERVER_END_REQ;
 293         if (ret == STATUS_PENDING) ret = wait_reply( &cookie );
 294         if (ret != STATUS_USER_APC) break;
 295         call_apcs( alertable );
 296         if (alertable) break;
 297     }
 298     if (HIWORD(ret))  /* is it an error code? */
 299     {
 300         SetLastError( RtlNtStatusToDosError(ret) );
 301         ret = WAIT_FAILED;
 302     }
 303     return ret;
 304 }
 305
 306
 307 /***********************************************************************
 308  *           WaitForSingleObject   (KERNEL.460)
 309  */
 310 DWORD WINAPI WaitForSingleObject16( HANDLE handle, DWORD timeout )
 311 {
 312     DWORD retval, mutex_count;
 313
 314     ReleaseThunkLock( &mutex_count );
 315     retval = WaitForSingleObject( handle, timeout );
 316     RestoreThunkLock( mutex_count );
 317     return retval;
 318 }
 319
 320 /***********************************************************************
 321  *           WaitForMultipleObjects   (KERNEL.461)
 322  */
 323 DWORD WINAPI WaitForMultipleObjects16( DWORD count, const HANDLE *handles,
 324                                        BOOL wait_all, DWORD timeout )
 325 {
 326     DWORD retval, mutex_count;
 327
 328     ReleaseThunkLock( &mutex_count );
 329     retval = WaitForMultipleObjectsEx( count, handles, wait_all, timeout, FALSE );
 330     RestoreThunkLock( mutex_count );
 331     return retval;
 332 }
 333
 334 /***********************************************************************
 335  *           WaitForMultipleObjectsEx   (KERNEL.495)
 336  */
 337 DWORD WINAPI WaitForMultipleObjectsEx16( DWORD count, const HANDLE *handles,
 338                                          BOOL wait_all, DWORD timeout, BOOL alertable )
 339 {
 340     DWORD retval, mutex_count;
 341
 342     ReleaseThunkLock( &mutex_count );
 343     retval = WaitForMultipleObjectsEx( count, handles, wait_all, timeout, alertable );
 344     RestoreThunkLock( mutex_count );
 345     return retval;
 346 }