LCOV - code coverage report
Current view: top level - src - gen-posix-lock-obj.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 11 13 84.6 %
Date: 2016-09-12 12:50:44 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /* gen-posix-lock-obj.c - Build tool to construct the lock object.
       2             :    Copyright (C) 2014 g10 Code GmbH
       3             : 
       4             :    This file is part of libgpg-error.
       5             : 
       6             :    libgpg-error is free software; you can redistribute it and/or
       7             :    modify it under the terms of the GNU Lesser General Public License
       8             :    as published by the Free Software Foundation; either version 2.1 of
       9             :    the License, or (at your option) any later version.
      10             : 
      11             :    libgpg-error is distributed in the hope that it will be useful, but
      12             :    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 program; if not, see <https://www.gnu.org/licenses/>.
      18             :  */
      19             : 
      20             : #if HAVE_CONFIG_H
      21             : #include <config.h>
      22             : #endif
      23             : 
      24             : #ifdef HAVE_W32_SYSTEM
      25             : # error This module may not be build for Windows.
      26             : #endif
      27             : 
      28             : #include <stdlib.h>
      29             : #include <string.h>
      30             : #include <stdio.h>
      31             : #include <errno.h>
      32             : #ifdef USE_POSIX_THREADS
      33             : # include <pthread.h>
      34             : #endif
      35             : 
      36             : #include "posix-lock-obj.h"
      37             : 
      38             : #define PGM "gen-posix-lock-obj"
      39             : 
      40             : /* Check that configure did its job.  */
      41             : #ifdef USE_POSIX_THREADS
      42             : #if SIZEOF_PTHREAD_MUTEX_T < 4
      43             : # error sizeof pthread_mutex_t is not known.
      44             : #endif
      45             : #endif
      46             : 
      47             : /* Special requirements for certain platforms.  */
      48             : # define USE_LONG_DOUBLE_FOR_ALIGNMENT 0
      49             : #if defined(__sun) && !defined (__LP64__) && !defined(_LP64)
      50             : /* Solaris on 32-bit architecture.  */
      51             : # define USE_DOUBLE_FOR_ALIGNMENT 1
      52             : #else
      53             : # define USE_DOUBLE_FOR_ALIGNMENT 0
      54             : #endif
      55             : #if defined(__hppa__)
      56             : # define USE_16BYTE_ALIGNMENT 1
      57             : #else
      58             : # define USE_16BYTE_ALIGNMENT 0
      59             : #endif
      60             : 
      61             : #if USE_16BYTE_ALIGNMENT && !HAVE_GCC_ATTRIBUTE_ALIGNED
      62             : # error compiler is not able to enforce a 16 byte alignment
      63             : #endif
      64             : 
      65             : #ifdef USE_POSIX_THREADS
      66             : static pthread_mutex_t mtx = PTHREAD_MUTEX_INITIALIZER;
      67             : #endif
      68             : 
      69             : int
      70           1 : main (void)
      71             : {
      72             : #ifdef USE_POSIX_THREADS
      73             :   unsigned char *p;
      74             :   int i;
      75             : #endif
      76             :   struct {
      77             :     long vers;
      78             : #ifdef USE_POSIX_THREADS
      79             :     pthread_mutex_t mtx;
      80             : #endif
      81             :   } dummyobj;
      82             : 
      83             : 
      84             : #ifdef USE_POSIX_THREADS
      85             :   if (sizeof mtx != SIZEOF_PTHREAD_MUTEX_T)
      86             :     {
      87             :       fprintf (stderr, PGM ": pthread_mutex_t mismatch\n");
      88             :       exit (1);
      89             :     }
      90             : #endif /*USE_POSIX_THREADS*/
      91             : 
      92             :   if (sizeof (dummyobj) != sizeof (_gpgrt_lock_t))
      93             :     {
      94             :       fprintf (stderr, PGM ": internal and external lock object mismatch\n");
      95             :       exit (1);
      96             :     }
      97             : 
      98           1 :   printf ("## lock-obj-pub.%s.h%s\n"
      99             :           "## File created by " PGM " - DO NOT EDIT\n"
     100             :           "## To be included by mkheader into gpg-error.h\n"
     101             :           "\n",
     102             :           HOST_TRIPLET_STRING,
     103             : #ifdef USE_POSIX_THREADS
     104             :           ""
     105             : #else
     106             :           " - NO LOCK SUPPORT"
     107             : #endif
     108             :           );
     109             : 
     110             : #ifdef USE_POSIX_THREADS
     111             : 
     112             :   /* To force a probably suitable alignment of the structure we use a
     113             :      union and include a long and a pointer to a long.  */
     114           1 :   printf ("typedef struct\n"
     115             :           "{\n"
     116             :           "  long _vers;\n"
     117             :           "  union {\n"
     118             :           "    volatile char _priv[%d];\n"
     119             :           "%s"
     120             :           "    long _x_align;\n"
     121             :           "    long *_xp_align;\n"
     122             :           "  } u;\n"
     123             :           "} gpgrt_lock_t;\n"
     124             :           "\n"
     125             :           "#define GPGRT_LOCK_INITIALIZER {%d,{{",
     126             :           SIZEOF_PTHREAD_MUTEX_T,
     127             : # if USE_16BYTE_ALIGNMENT
     128             :           "    int _x16_align __attribute__ ((aligned (16)));\n",
     129             : # elif USE_DOUBLE_FOR_ALIGNMENT
     130             :           "    double _xd_align;\n",
     131             : # elif USE_LONG_DOUBLE_FOR_ALIGNMENT
     132             :           "    long double _xld_align;\n",
     133             : # else
     134             :           "",
     135             : # endif
     136             :           LOCK_ABI_VERSION);
     137             :   p = (unsigned char *)&mtx;
     138          41 :   for (i=0; i < sizeof mtx; i++)
     139             :     {
     140          40 :       if (i && !(i % 8))
     141           4 :         printf (" \\\n%*s", 36, "");
     142          40 :       printf ("%u", p[i]);
     143          40 :       if (i < sizeof mtx - 1)
     144             :         putchar (',');
     145             :     }
     146           1 :   fputs ("}}}\n", stdout);
     147             : 
     148             : #else /*!USE_POSIX_THREADS*/
     149             : 
     150             :   printf ("/* Dummy object - no locking available.  */\n"
     151             :           "typedef struct\n"
     152             :           "{\n"
     153             :           "  long _vers;\n"
     154             :           "} gpgrt_lock_t;\n"
     155             :           "\n"
     156             :           "#define GPGRT_LOCK_INITIALIZER {%d}\n",
     157             :           LOCK_ABI_VERSION);
     158             : 
     159             : #endif /*!USE_POSIX_THREADS*/
     160             : 
     161           1 :   fputs ("##\n"
     162             :          "## Loc" "al Variables:\n"
     163             :          "## mode: c\n"
     164             :          "## buffer-read-only: t\n"
     165             :          "## End:\n"
     166             :          "##\n", stdout);
     167             : 
     168           1 :   if (ferror (stdout))
     169             :     {
     170           0 :       fprintf (stderr, PGM ": error writing to stdout: %s\n", strerror (errno));
     171           0 :       return 1;
     172             :     }
     173             : 
     174             :   return 0;
     175             : }

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