git.sesse.net Git - vlc/blob - modules/access_output/udp.c

   1 /*****************************************************************************
   2  * udp.c
   3  *****************************************************************************
   4  * Copyright (C) 2001-2005 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   8  *          Eric Petit <titer@videolan.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28 #include <stdlib.h>
  29 #include <sys/types.h>
  30 #include <sys/stat.h>
  31 #include <string.h>
  32 #include <errno.h>
  33 #include <fcntl.h>
  34
  35 #include <vlc/vlc.h>
  36 #include <vlc/sout.h>
  37
  38 #ifdef HAVE_UNISTD_H
  39 #   include <unistd.h>
  40 #endif
  41
  42 #ifdef WIN32
  43 #   include <winsock2.h>
  44 #   include <ws2tcpip.h>
  45 #   ifndef IN_MULTICAST
  46 #       define IN_MULTICAST(a) IN_CLASSD(a)
  47 #   endif
  48 #else
  49 #   include <sys/socket.h>
  50 #endif
  51
  52 #include "network.h"
  53
  54 #define MAX_EMPTY_BLOCKS 200
  55
  56 #if defined(WIN32) || defined(UNDER_CE)
  57 # define WINSOCK_STRERROR_SIZE 20
  58 static const char *winsock_strerror( char *buf )
  59 {
  60     snprintf( buf, WINSOCK_STRERROR_SIZE, "Winsock error %d",
  61               WSAGetLastError( ) );
  62     buf[WINSOCK_STRERROR_SIZE - 1] = '\0';
  63     return buf;
  64 }
  65 #endif
  66
  67 /*****************************************************************************
  68  * Module descriptor
  69  *****************************************************************************/
  70 static int  Open ( vlc_object_t * );
  71 static void Close( vlc_object_t * );
  72
  73 #define SOUT_CFG_PREFIX "sout-udp-"
  74
  75 #define CACHING_TEXT N_("Caching value (ms)")
  76 #define CACHING_LONGTEXT N_( \
  77     "Allows you to modify the default caching value for UDP streams. This " \
  78     "value should be set in millisecond units." )
  79
  80 #define TTL_TEXT N_("Time-To-Live (TTL)")
  81 #define TTL_LONGTEXT N_("Allows you to define the Time-To-Live of the " \
  82                         "outgoing stream.")
  83
  84 #define GROUP_TEXT N_("Group packets")
  85 #define GROUP_LONGTEXT N_("Packets can be sent one by one at the right time " \
  86                           "or by groups. This allows you to give the number " \
  87                           "of packets that will be sent at a time. It " \
  88                           "helps reducing the scheduling load on " \
  89                           "heavily-loaded systems." )
  90 #define RAW_TEXT N_("Raw write")
  91 #define RAW_LONGTEXT N_("If you enable this option, packets will be sent " \
  92                        "directly, without trying to fill the MTU (ie, " \
  93                        "without trying to make the biggest possible packets " \
  94                        "in order to improve streaming)." )
  95
  96 vlc_module_begin();
  97     set_description( _("UDP stream output") );
  98     set_shortname( N_( "UDP" ) );
  99     set_category( CAT_SOUT );
 100     set_subcategory( SUBCAT_SOUT_ACO );
 101     add_integer( SOUT_CFG_PREFIX "caching", DEFAULT_PTS_DELAY / 1000, NULL, CACHING_TEXT, CACHING_LONGTEXT, VLC_TRUE );
 102     add_integer( SOUT_CFG_PREFIX "ttl", 0, NULL,TTL_TEXT, TTL_LONGTEXT,
 103                                  VLC_TRUE );
 104     add_integer( SOUT_CFG_PREFIX "group", 1, NULL, GROUP_TEXT, GROUP_LONGTEXT,
 105                                  VLC_TRUE );
 106     add_suppressed_integer( SOUT_CFG_PREFIX "late" );
 107     add_bool( SOUT_CFG_PREFIX "raw",  0, NULL, RAW_TEXT, RAW_LONGTEXT,
 108                                  VLC_TRUE );
 109
 110     set_capability( "sout access", 100 );
 111     add_shortcut( "udp" );
 112     add_shortcut( "rtp" ); // Will work only with ts muxer
 113     set_callbacks( Open, Close );
 114 vlc_module_end();
 115
 116 /*****************************************************************************
 117  * Exported prototypes
 118  *****************************************************************************/
 119
 120 static const char *ppsz_sout_options[] = {
 121     "caching",
 122     "ttl",
 123     "group",
 124     "raw",
 125     NULL
 126 };
 127
 128 static int  Write   ( sout_access_out_t *, block_t * );
 129 static int  WriteRaw( sout_access_out_t *, block_t * );
 130 static int  Seek    ( sout_access_out_t *, off_t  );
 131
 132 static void ThreadWrite( vlc_object_t * );
 133 static block_t *NewUDPPacket( sout_access_out_t *, mtime_t );
 134
 135 typedef struct sout_access_thread_t
 136 {
 137     VLC_COMMON_MEMBERS
 138
 139     sout_instance_t *p_sout;
 140
 141     block_fifo_t *p_fifo;
 142
 143     int         i_handle;
 144
 145     int64_t     i_caching;
 146     int         i_group;
 147
 148     vlc_mutex_t blocks_lock;
 149     block_t     *p_empty_blocks;
 150     int         i_empty_depth;
 151
 152 } sout_access_thread_t;
 153
 154 struct sout_access_out_sys_t
 155 {
 156     int                 b_rtpts;  // 1 if add rtp/ts header
 157     uint16_t            i_sequence_number;
 158     uint32_t            i_ssrc;
 159
 160     int                 i_mtu;
 161
 162     block_t             *p_buffer;
 163
 164     sout_access_thread_t *p_thread;
 165
 166     vlc_bool_t          b_mtu_warning;
 167 };
 168
 169 #define DEFAULT_PORT 1234
 170
 171 /*****************************************************************************
 172  * Open: open the file
 173  *****************************************************************************/
 174 static int Open( vlc_object_t *p_this )
 175 {
 176     sout_access_out_t       *p_access = (sout_access_out_t*)p_this;
 177     sout_access_out_sys_t   *p_sys;
 178
 179     char                *psz_parser;
 180     char                *psz_dst_addr;
 181     int                 i_dst_port;
 182
 183     int                 i_handle;
 184
 185     vlc_value_t         val;
 186
 187     sout_CfgParse( p_access, SOUT_CFG_PREFIX,
 188                    ppsz_sout_options, p_access->p_cfg );
 189
 190     if( !( p_sys = malloc( sizeof( sout_access_out_sys_t ) ) ) )
 191     {
 192         msg_Err( p_access, "not enough memory" );
 193         return VLC_EGENERIC;
 194     }
 195     memset( p_sys, 0, sizeof(sout_access_out_sys_t) );
 196     p_access->p_sys = p_sys;
 197
 198     if( p_access->psz_access != NULL &&
 199         !strcmp( p_access->psz_access, "rtp" ) )
 200     {
 201         p_sys->b_rtpts = 1;
 202     }
 203     else
 204     {
 205         p_sys->b_rtpts = 0;
 206     }
 207
 208     psz_parser = strdup( p_access->psz_name );
 209
 210     psz_dst_addr = psz_parser;
 211     i_dst_port = 0;
 212
 213     if ( *psz_parser == '[' )
 214     {
 215         while( *psz_parser && *psz_parser != ']' )
 216         {
 217             psz_parser++;
 218         }
 219     }
 220     while( *psz_parser && *psz_parser != ':' )
 221     {
 222         psz_parser++;
 223     }
 224     if( *psz_parser == ':' )
 225     {
 226         *psz_parser = '\0';
 227         psz_parser++;
 228         i_dst_port = atoi( psz_parser );
 229     }
 230     if( i_dst_port <= 0 )
 231     {
 232         i_dst_port = DEFAULT_PORT;
 233     }
 234
 235     p_sys->p_thread =
 236         vlc_object_create( p_access, sizeof( sout_access_thread_t ) );
 237     if( !p_sys->p_thread )
 238     {
 239         msg_Err( p_access, "out of memory" );
 240         return VLC_EGENERIC;
 241     }
 242
 243     p_sys->p_thread->p_sout = p_access->p_sout;
 244     p_sys->p_thread->b_die  = 0;
 245     p_sys->p_thread->b_error= 0;
 246     p_sys->p_thread->p_fifo = block_FifoNew( p_access );
 247     p_sys->p_thread->p_empty_blocks = NULL;
 248     p_sys->p_thread->i_empty_depth = 0;
 249     vlc_mutex_init( p_access, &p_sys->p_thread->blocks_lock );
 250
 251     var_Get( p_access, SOUT_CFG_PREFIX "ttl", &val );
 252     i_handle = net_ConnectUDP( p_this, psz_dst_addr, i_dst_port, val.i_int );
 253     if( i_handle == -1 )
 254     {
 255          msg_Err( p_access, "failed to open a connection (udp)" );
 256          return VLC_EGENERIC;
 257     }
 258
 259     p_sys->p_thread->i_handle = i_handle;
 260     net_StopRecv( i_handle );
 261
 262     var_Get( p_access, SOUT_CFG_PREFIX "caching", &val );
 263     p_sys->p_thread->i_caching = (int64_t)val.i_int * 1000;
 264
 265     var_Get( p_access, SOUT_CFG_PREFIX "group", &val );
 266     p_sys->p_thread->i_group = val.i_int;
 267
 268     p_sys->i_mtu = var_CreateGetInteger( p_this, "mtu" );
 269
 270     if( vlc_thread_create( p_sys->p_thread, "sout write thread", ThreadWrite,
 271                            VLC_THREAD_PRIORITY_HIGHEST, VLC_FALSE ) )
 272     {
 273         msg_Err( p_access->p_sout, "cannot spawn sout access thread" );
 274         vlc_object_destroy( p_sys->p_thread );
 275         return VLC_EGENERIC;
 276     }
 277
 278     srand( (uint32_t)mdate());
 279     p_sys->p_buffer          = NULL;
 280     p_sys->i_sequence_number = rand()&0xffff;
 281     p_sys->i_ssrc            = rand()&0xffffffff;
 282
 283     var_Get( p_access, SOUT_CFG_PREFIX "raw", &val );
 284     if( val.b_bool )  p_access->pf_write = WriteRaw;
 285     else p_access->pf_write = Write;
 286
 287     p_access->pf_seek = Seek;
 288
 289     msg_Dbg( p_access, "udp access output opened(%s:%d)",
 290              psz_dst_addr, i_dst_port );
 291
 292     free( psz_dst_addr );
 293
 294     /* update p_sout->i_out_pace_nocontrol */
 295     p_access->p_sout->i_out_pace_nocontrol++;
 296
 297     return VLC_SUCCESS;
 298 }
 299
 300 /*****************************************************************************
 301  * Close: close the target
 302  *****************************************************************************/
 303 static void Close( vlc_object_t * p_this )
 304 {
 305     sout_access_out_t     *p_access = (sout_access_out_t*)p_this;
 306     sout_access_out_sys_t *p_sys = p_access->p_sys;
 307     int i;
 308
 309     p_sys->p_thread->b_die = 1;
 310     for( i = 0; i < 10; i++ )
 311     {
 312         block_t *p_dummy = block_New( p_access, p_sys->i_mtu );
 313         p_dummy->i_dts = 0;
 314         p_dummy->i_pts = 0;
 315         p_dummy->i_length = 0;
 316         memset( p_dummy->p_buffer, 0, p_dummy->i_buffer );
 317         block_FifoPut( p_sys->p_thread->p_fifo, p_dummy );
 318     }
 319     vlc_thread_join( p_sys->p_thread );
 320
 321     block_FifoRelease( p_sys->p_thread->p_fifo );
 322
 323     if( p_sys->p_buffer ) block_Release( p_sys->p_buffer );
 324     while ( p_sys->p_thread->p_empty_blocks != NULL )
 325     {
 326         block_t *p_next = p_sys->p_thread->p_empty_blocks->p_next;
 327         block_Release( p_sys->p_thread->p_empty_blocks );
 328         p_sys->p_thread->p_empty_blocks = p_next;
 329     }
 330     vlc_mutex_destroy( &p_sys->p_thread->blocks_lock );
 331
 332     net_Close( p_sys->p_thread->i_handle );
 333
 334     vlc_object_destroy( p_sys->p_thread );
 335     /* update p_sout->i_out_pace_nocontrol */
 336     p_access->p_sout->i_out_pace_nocontrol--;
 337
 338     msg_Dbg( p_access, "udp access output closed" );
 339     free( p_sys );
 340 }
 341
 342 /*****************************************************************************
 343  * Write: standard write on a file descriptor.
 344  *****************************************************************************/
 345 static int Write( sout_access_out_t *p_access, block_t *p_buffer )
 346 {
 347     sout_access_out_sys_t *p_sys = p_access->p_sys;
 348
 349     while( p_buffer )
 350     {
 351         block_t *p_next;
 352         int i_packets = 0;
 353
 354         if( !p_sys->b_mtu_warning && p_buffer->i_buffer > p_sys->i_mtu )
 355         {
 356             msg_Warn( p_access, "packet size > MTU, you should probably "
 357                       "increase the MTU" );
 358             p_sys->b_mtu_warning = VLC_TRUE;
 359         }
 360
 361         /* Check if there is enough space in the buffer */
 362         if( p_sys->p_buffer &&
 363             p_sys->p_buffer->i_buffer + p_buffer->i_buffer > p_sys->i_mtu )
 364         {
 365             if( p_sys->p_buffer->i_dts + p_sys->p_thread->i_caching < mdate() )
 366             {
 367                 msg_Dbg( p_access, "late packet for udp input (" I64Fd ")",
 368                          mdate() - p_sys->p_buffer->i_dts
 369                           - p_sys->p_thread->i_caching );
 370             }
 371             block_FifoPut( p_sys->p_thread->p_fifo, p_sys->p_buffer );
 372             p_sys->p_buffer = NULL;
 373         }
 374
 375         while( p_buffer->i_buffer )
 376         {
 377             int i_write = __MIN( p_buffer->i_buffer, p_sys->i_mtu );
 378
 379             i_packets++;
 380
 381             if( !p_sys->p_buffer )
 382             {
 383                 p_sys->p_buffer = NewUDPPacket( p_access, p_buffer->i_dts );
 384                 if( !p_sys->p_buffer ) break;
 385             }
 386
 387             memcpy( p_sys->p_buffer->p_buffer + p_sys->p_buffer->i_buffer,
 388                     p_buffer->p_buffer, i_write );
 389
 390             p_sys->p_buffer->i_buffer += i_write;
 391             p_buffer->p_buffer += i_write;
 392             p_buffer->i_buffer -= i_write;
 393             if ( p_buffer->i_flags & BLOCK_FLAG_CLOCK )
 394             {
 395                 if ( p_sys->p_buffer->i_flags & BLOCK_FLAG_CLOCK )
 396                     msg_Warn( p_access, "putting two PCRs at once" );
 397                 p_sys->p_buffer->i_flags |= BLOCK_FLAG_CLOCK;
 398             }
 399
 400             if( p_sys->p_buffer->i_buffer == p_sys->i_mtu || i_packets > 1 )
 401             {
 402                 /* Flush */
 403                 if( p_sys->p_buffer->i_dts + p_sys->p_thread->i_caching
 404                       < mdate() )
 405                 {
 406                     msg_Dbg( p_access, "late packet for udp input (" I64Fd ")",
 407                              mdate() - p_sys->p_buffer->i_dts
 408                               - p_sys->p_thread->i_caching );
 409                 }
 410                 block_FifoPut( p_sys->p_thread->p_fifo, p_sys->p_buffer );
 411                 p_sys->p_buffer = NULL;
 412             }
 413         }
 414
 415         p_next = p_buffer->p_next;
 416         block_Release( p_buffer );
 417         p_buffer = p_next;
 418     }
 419
 420     return( p_sys->p_thread->b_error ? -1 : 0 );
 421 }
 422
 423 /*****************************************************************************
 424  * WriteRaw: write p_buffer without trying to fill mtu
 425  *****************************************************************************/
 426 static int WriteRaw( sout_access_out_t *p_access, block_t *p_buffer )
 427 {
 428     sout_access_out_sys_t   *p_sys = p_access->p_sys;
 429     block_t *p_buf;
 430
 431     vlc_mutex_lock( &p_sys->p_thread->blocks_lock );
 432     while ( p_sys->p_thread->i_empty_depth >= MAX_EMPTY_BLOCKS )
 433     {
 434         p_buf = p_sys->p_thread->p_empty_blocks;
 435         p_sys->p_thread->p_empty_blocks =
 436                     p_sys->p_thread->p_empty_blocks->p_next;
 437         p_sys->p_thread->i_empty_depth--;
 438         vlc_mutex_unlock( &p_sys->p_thread->blocks_lock );
 439         block_Release( p_buf );
 440         vlc_mutex_lock( &p_sys->p_thread->blocks_lock );
 441     }
 442     vlc_mutex_unlock( &p_sys->p_thread->blocks_lock );
 443
 444     block_FifoPut( p_sys->p_thread->p_fifo, p_buffer );
 445
 446     return( p_sys->p_thread->b_error ? -1 : 0 );
 447 }
 448
 449 /*****************************************************************************
 450  * Seek: seek to a specific location in a file
 451  *****************************************************************************/
 452 static int Seek( sout_access_out_t *p_access, off_t i_pos )
 453 {
 454     msg_Err( p_access, "UDP sout access cannot seek" );
 455     return -1;
 456 }
 457
 458 /*****************************************************************************
 459  * NewUDPPacket: allocate a new UDP packet of size p_sys->i_mtu
 460  *****************************************************************************/
 461 static block_t *NewUDPPacket( sout_access_out_t *p_access, mtime_t i_dts)
 462 {
 463     sout_access_out_sys_t *p_sys = p_access->p_sys;
 464     block_t *p_buffer;
 465
 466     vlc_mutex_lock( &p_sys->p_thread->blocks_lock );
 467     while ( p_sys->p_thread->i_empty_depth > MAX_EMPTY_BLOCKS )
 468     {
 469         p_buffer = p_sys->p_thread->p_empty_blocks;
 470         p_sys->p_thread->p_empty_blocks =
 471                     p_sys->p_thread->p_empty_blocks->p_next;
 472         p_sys->p_thread->i_empty_depth--;
 473         vlc_mutex_unlock( &p_sys->p_thread->blocks_lock );
 474         block_Release( p_buffer );
 475         vlc_mutex_lock( &p_sys->p_thread->blocks_lock );
 476     }
 477     p_buffer = p_sys->p_thread->p_empty_blocks;
 478     if ( p_buffer != NULL )
 479     {
 480         p_sys->p_thread->p_empty_blocks =
 481                     p_sys->p_thread->p_empty_blocks->p_next;
 482         p_sys->p_thread->i_empty_depth--;
 483         vlc_mutex_unlock( &p_sys->p_thread->blocks_lock );
 484         p_buffer->p_next = NULL;
 485         p_buffer->i_flags = 0;
 486         p_buffer = block_Realloc( p_buffer, 0, p_sys->i_mtu );
 487     }
 488     else
 489     {
 490         vlc_mutex_unlock( &p_sys->p_thread->blocks_lock );
 491         p_buffer = block_New( p_access->p_sout, p_sys->i_mtu );
 492     }
 493
 494     p_buffer->i_dts = i_dts;
 495     p_buffer->i_buffer = 0;
 496
 497     if( p_sys->b_rtpts )
 498     {
 499         mtime_t i_timestamp = p_buffer->i_dts * 9 / 100;
 500
 501         /* add rtp/ts header */
 502         p_buffer->p_buffer[0] = 0x80;
 503         p_buffer->p_buffer[1] = 0x21; // mpeg2-ts
 504
 505         p_buffer->p_buffer[2] = ( p_sys->i_sequence_number >> 8 )&0xff;
 506         p_buffer->p_buffer[3] = p_sys->i_sequence_number&0xff;
 507         p_sys->i_sequence_number++;
 508
 509         p_buffer->p_buffer[4] = ( i_timestamp >> 24 )&0xff;
 510         p_buffer->p_buffer[5] = ( i_timestamp >> 16 )&0xff;
 511         p_buffer->p_buffer[6] = ( i_timestamp >>  8 )&0xff;
 512         p_buffer->p_buffer[7] = i_timestamp&0xff;
 513
 514         p_buffer->p_buffer[ 8] = ( p_sys->i_ssrc >> 24 )&0xff;
 515         p_buffer->p_buffer[ 9] = ( p_sys->i_ssrc >> 16 )&0xff;
 516         p_buffer->p_buffer[10] = ( p_sys->i_ssrc >>  8 )&0xff;
 517         p_buffer->p_buffer[11] = p_sys->i_ssrc&0xff;
 518
 519         p_buffer->i_buffer = 12;
 520     }
 521
 522     return p_buffer;
 523 }
 524
 525 /*****************************************************************************
 526  * ThreadWrite: Write a packet on the network at the good time.
 527  *****************************************************************************/
 528 static void ThreadWrite( vlc_object_t *p_this )
 529 {
 530     sout_access_thread_t *p_thread = (sout_access_thread_t*)p_this;
 531     mtime_t              i_date_last = -1;
 532     mtime_t              i_to_send = p_thread->i_group;
 533     int                  i_dropped_packets = 0;
 534 #if defined(WIN32) || defined(UNDER_CE)
 535     char strerror_buf[WINSOCK_STRERROR_SIZE];
 536 # define strerror( x ) winsock_strerror( strerror_buf )
 537 #endif
 538
 539     while( !p_thread->b_die )
 540     {
 541         block_t *p_pk;
 542         mtime_t       i_date, i_sent;
 543
 544         p_pk = block_FifoGet( p_thread->p_fifo );
 545
 546         i_date = p_thread->i_caching + p_pk->i_dts;
 547         if( i_date_last > 0 )
 548         {
 549             if( i_date - i_date_last > 2000000 )
 550             {
 551                 if( !i_dropped_packets )
 552                     msg_Dbg( p_thread, "mmh, hole ("I64Fd" > 2s) -> drop",
 553                              i_date - i_date_last );
 554
 555                 vlc_mutex_lock( &p_thread->blocks_lock );
 556                 p_pk->p_next = p_thread->p_empty_blocks;
 557                 p_thread->p_empty_blocks = p_pk;
 558                 p_thread->i_empty_depth++;
 559                 vlc_mutex_unlock( &p_thread->blocks_lock );
 560
 561                 i_date_last = i_date;
 562                 i_dropped_packets++;
 563                 continue;
 564             }
 565             else if( i_date - i_date_last < -1000 )
 566             {
 567                 if( !i_dropped_packets )
 568                     msg_Dbg( p_thread, "mmh, packets in the past ("I64Fd")",
 569                              i_date_last - i_date );
 570             }
 571         }
 572
 573         i_to_send--;
 574         if( !i_to_send || (p_pk->i_flags & BLOCK_FLAG_CLOCK) )
 575         {
 576             mwait( i_date );
 577             i_to_send = p_thread->i_group;
 578         }
 579         if( send( p_thread->i_handle, p_pk->p_buffer, p_pk->i_buffer, 0 )
 580               == -1 )
 581         {
 582             msg_Warn( p_thread, "send error: %s", strerror(errno) );
 583         }
 584
 585         if( i_dropped_packets )
 586         {
 587             msg_Dbg( p_thread, "dropped %i packets", i_dropped_packets );
 588             i_dropped_packets = 0;
 589         }
 590
 591 #if 1
 592         i_sent = mdate();
 593         if ( i_sent > i_date + 20000 )
 594         {
 595             msg_Dbg( p_thread, "packet has been sent too late (" I64Fd ")",
 596                      i_sent - i_date );
 597         }
 598 #endif
 599
 600         vlc_mutex_lock( &p_thread->blocks_lock );
 601         p_pk->p_next = p_thread->p_empty_blocks;
 602         p_thread->p_empty_blocks = p_pk;
 603         p_thread->i_empty_depth++;
 604         vlc_mutex_unlock( &p_thread->blocks_lock );
 605
 606         i_date_last = i_date;
 607     }
 608 }